/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.digester;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.Permission;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EmptyStackException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.PropertyPermission;
import java.util.Set;
import java.util.StringTokenizer;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.IntrospectionUtils;
import org.apache.tomcat.util.IntrospectionUtils.PropertySource;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.res.StringManager;
import org.apache.tomcat.util.security.PermissionCheck;
import org.xml.sax.Attributes;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.DefaultHandler2;
import org.xml.sax.ext.EntityResolver2;
import org.xml.sax.ext.Locator2;
import org.xml.sax.helpers.AttributesImpl;


A Digester processes an XML input stream by matching a
series of element nesting patterns to execute Rules that have been added
prior to the start of parsing.  This package was inspired by the
XmlMapper class that was part of Tomcat 3.0 and 3.1,
but is organized somewhat differently.
See the Digester
Developer Guide for more information.
IMPLEMENTATION NOTE - A single Digester instance may
only be used within the context of a single thread at a time, and a call
to parse() must be completed before another can be initiated
even from the same thread.
IMPLEMENTATION NOTE - A bug in Xerces 2.0.2 prevents
the support of XML schema. You need Xerces 2.1/2.3 and up to make
this class working with XML schema
/**
 * <p>A <strong>Digester</strong> processes an XML input stream by matching a
 * series of element nesting patterns to execute Rules that have been added
 * prior to the start of parsing.  This package was inspired by the
 * <code>XmlMapper</code> class that was part of Tomcat 3.0 and 3.1,
 * but is organized somewhat differently.</p>
 *
 * <p>See the <a href="package-summary.html#package_description">Digester
 * Developer Guide</a> for more information.</p>
 *
 * <p><strong>IMPLEMENTATION NOTE</strong> - A single Digester instance may
 * only be used within the context of a single thread at a time, and a call
 * to <code>parse()</code> must be completed before another can be initiated
 * even from the same thread.</p>
 *
 * <p><strong>IMPLEMENTATION NOTE</strong> - A bug in Xerces 2.0.2 prevents
 * the support of XML schema. You need Xerces 2.1/2.3 and up to make
 * this class working with XML schema</p>
 */
public class Digester extends DefaultHandler2 {

    // ---------------------------------------------------------- Static Fields

    protected static IntrospectionUtils.PropertySource[] propertySources;
    private static boolean propertySourcesSet = false;
    protected static final StringManager sm = StringManager.getManager(Digester.class);

    static {
        String classNames = System.getProperty("org.apache.tomcat.util.digester.PROPERTY_SOURCE");
        ArrayList<IntrospectionUtils.PropertySource> sourcesList = new ArrayList<>();
        IntrospectionUtils.PropertySource[] sources = null;
        if (classNames != null) {
            StringTokenizer classNamesTokenizer = new StringTokenizer(classNames, ",");
            while (classNamesTokenizer.hasMoreTokens()) {
                String className = classNamesTokenizer.nextToken().trim();
                ClassLoader[] cls = new ClassLoader[] { Digester.class.getClassLoader(),
                        Thread.currentThread().getContextClassLoader() };
                for (ClassLoader cl : cls) {
                    try {
                        Class<?> clazz = Class.forName(className, true, cl);
                        sourcesList.add((PropertySource) clazz.getConstructor().newInstance());
                        break;
                    } catch (Throwable t) {
                        ExceptionUtils.handleThrowable(t);
                        LogFactory.getLog(Digester.class).error(sm.getString("digester.propertySourceLoadError", className), t);
                    }
                }
            }
            sources = sourcesList.toArray(new IntrospectionUtils.PropertySource[0]);
        }
        if (sources != null) {
            propertySources = sources;
            propertySourcesSet = true;
        }
        if (Boolean.getBoolean("org.apache.tomcat.util.digester.REPLACE_SYSTEM_PROPERTIES")) {
            replaceSystemProperties();
        }
    }

    public static void setPropertySource(IntrospectionUtils.PropertySource propertySource) {
        if (!propertySourcesSet) {
            propertySources = new IntrospectionUtils.PropertySource[1];
            propertySources[0] = propertySource;
            propertySourcesSet = true;
        }
    }

    public static void setPropertySource(IntrospectionUtils.PropertySource[] propertySources) {
        if (!propertySourcesSet) {
            Digester.propertySources = propertySources;
            propertySourcesSet = true;
        }
    }

    private static final HashSet<String> generatedClasses = new HashSet<>();

    public static void addGeneratedClass(String className) {
        generatedClasses.add(className);
    }

    public static String[] getGeneratedClasses() {
        return generatedClasses.toArray(new String[0]);
    }

    public interface GeneratedCodeLoader {
        Object loadGeneratedCode(String className);
    }

    private static GeneratedCodeLoader generatedCodeLoader;

    public static boolean isGeneratedCodeLoaderSet() {
        return (Digester.generatedCodeLoader != null);
    }

    public static void setGeneratedCodeLoader(GeneratedCodeLoader generatedCodeLoader) {
        if (Digester.generatedCodeLoader == null) {
            Digester.generatedCodeLoader = generatedCodeLoader;
        }
    }

    public static Object loadGeneratedClass(String className) {
        if (generatedCodeLoader != null) {
            return generatedCodeLoader.loadGeneratedCode(className);
        }
        return null;
    }

    // --------------------------------------------------- Instance Variables


    private static class SystemPropertySource implements IntrospectionUtils.SecurePropertySource {

        @Override
        public String getProperty(String key) {
            // For backward compatibility
            return getProperty(key, null);
        }

        @Override
        public String getProperty(String key, ClassLoader classLoader) {
            if (classLoader instanceof PermissionCheck) {
                Permission p = new PropertyPermission(key, "read");
                if (!((PermissionCheck) classLoader).check(p)) {
                    return null;
                }
            }
            return System.getProperty(key);
        }
    }


    protected IntrospectionUtils.PropertySource[] source = new IntrospectionUtils.PropertySource[] {
            new SystemPropertySource() };


    
The body text of the current element.
/**
     * The body text of the current element.
     */
    protected StringBuilder bodyText = new StringBuilder();


    
The stack of body text string buffers for surrounding elements.
/**
     * The stack of body text string buffers for surrounding elements.
     */
    protected ArrayStack<StringBuilder> bodyTexts = new ArrayStack<>();


    
Stack whose elements are List objects, each containing a list of
Rule objects as returned from Rules.getMatch(). As each xml element
in the input is entered, the matching rules are pushed onto this
stack. After the end tag is reached, the matches are popped again.
The depth of is stack is therefore exactly the same as the current
"nesting" level of the input xml.
Since:
1.6/**
     * Stack whose elements are List objects, each containing a list of
     * Rule objects as returned from Rules.getMatch(). As each xml element
     * in the input is entered, the matching rules are pushed onto this
     * stack. After the end tag is reached, the matches are popped again.
     * The depth of is stack is therefore exactly the same as the current
     * "nesting" level of the input xml.
     *
     * @since 1.6
     */
    protected ArrayStack<List<Rule>> matches = new ArrayStack<>(10);

    
The class loader to use for instantiating application objects.
If not specified, the context class loader, or the class loader
used to load Digester itself, is used, based on the value of the
useContextClassLoader variable.
/**
     * The class loader to use for instantiating application objects.
     * If not specified, the context class loader, or the class loader
     * used to load Digester itself, is used, based on the value of the
     * <code>useContextClassLoader</code> variable.
     */
    protected ClassLoader classLoader = null;


    
Has this Digester been configured yet.
/**
     * Has this Digester been configured yet.
     */
    protected boolean configured = false;


    
The EntityResolver used by the SAX parser. By default it use this class
/**
     * The EntityResolver used by the SAX parser. By default it use this class
     */
    protected EntityResolver entityResolver;

    
The URLs of entityValidator that have been registered, keyed by the public
identifier that corresponds.
/**
     * The URLs of entityValidator that have been registered, keyed by the public
     * identifier that corresponds.
     */
    protected HashMap<String, String> entityValidator = new HashMap<>();


    
The application-supplied error handler that is notified when parsing
warnings, errors, or fatal errors occur.
/**
     * The application-supplied error handler that is notified when parsing
     * warnings, errors, or fatal errors occur.
     */
    protected ErrorHandler errorHandler = null;


    
The SAXParserFactory that is created the first time we need it.
/**
     * The SAXParserFactory that is created the first time we need it.
     */
    protected SAXParserFactory factory = null;

    
The Locator associated with our parser.
/**
     * The Locator associated with our parser.
     */
    protected Locator locator = null;


    
The current match pattern for nested element processing.
/**
     * The current match pattern for nested element processing.
     */
    protected String match = "";


    
Do we want a "namespace aware" parser.
/**
     * Do we want a "namespace aware" parser.
     */
    protected boolean namespaceAware = false;


    
Registered namespaces we are currently processing.  The key is the
namespace prefix that was declared in the document.  The value is an
ArrayStack of the namespace URIs this prefix has been mapped to --
the top Stack element is the most current one.  (This architecture
is required because documents can declare nested uses of the same
prefix for different Namespace URIs).
/**
     * Registered namespaces we are currently processing.  The key is the
     * namespace prefix that was declared in the document.  The value is an
     * ArrayStack of the namespace URIs this prefix has been mapped to --
     * the top Stack element is the most current one.  (This architecture
     * is required because documents can declare nested uses of the same
     * prefix for different Namespace URIs).
     */
    protected HashMap<String, ArrayStack<String>> namespaces = new HashMap<>();


    
The parameters stack being utilized by CallMethodRule and
CallParamRule rules.
/**
     * The parameters stack being utilized by CallMethodRule and
     * CallParamRule rules.
     */
    protected ArrayStack<Object> params = new ArrayStack<>();


    
The SAXParser we will use to parse the input stream.
/**
     * The SAXParser we will use to parse the input stream.
     */
    protected SAXParser parser = null;


    
The public identifier of the DTD we are currently parsing under
(if any).
/**
     * The public identifier of the DTD we are currently parsing under
     * (if any).
     */
    protected String publicId = null;


    
The XMLReader used to parse digester rules.
/**
     * The XMLReader used to parse digester rules.
     */
    protected XMLReader reader = null;


    
The "root" element of the stack (in other words, the last object
that was popped.
/**
     * The "root" element of the stack (in other words, the last object
     * that was popped.
     */
    protected Object root = null;


    
The Rules implementation containing our collection of
Rule instances and associated matching policy.  If not
established before the first rule is added, a default implementation
will be provided.
/**
     * The <code>Rules</code> implementation containing our collection of
     * <code>Rule</code> instances and associated matching policy.  If not
     * established before the first rule is added, a default implementation
     * will be provided.
     */
    protected Rules rules = null;

    
The object stack being constructed.
/**
     * The object stack being constructed.
     */
    protected ArrayStack<Object> stack = new ArrayStack<>();


    
Do we want to use the Context ClassLoader when loading classes
for instantiating new objects.  Default is false.
/**
     * Do we want to use the Context ClassLoader when loading classes
     * for instantiating new objects.  Default is <code>false</code>.
     */
    protected boolean useContextClassLoader = false;


    
Do we want to use a validating parser.
/**
     * Do we want to use a validating parser.
     */
    protected boolean validating = false;


    
Warn on missing attributes and elements.
/**
     * Warn on missing attributes and elements.
     */
    protected boolean rulesValidation = false;


    
Fake attributes map (attributes are often used for object creation).
/**
     * Fake attributes map (attributes are often used for object creation).
     */
    protected Map<Class<?>, List<String>> fakeAttributes = null;


    
The Log to which most logging calls will be made.
/**
     * The Log to which most logging calls will be made.
     */
    protected Log log = LogFactory.getLog(Digester.class);

    
The Log to which all SAX event related logging calls will be made.
/**
     * The Log to which all SAX event related logging calls will be made.
     */
    protected Log saxLog = LogFactory.getLog("org.apache.tomcat.util.digester.Digester.sax");

    
Generated code.
/**
     * Generated code.
     */
    protected StringBuilder code = null;

    public Digester() {
        propertySourcesSet = true;
        if (propertySources != null) {
            ArrayList<IntrospectionUtils.PropertySource> sourcesList = new ArrayList<>();
            sourcesList.addAll(Arrays.asList(propertySources));
            sourcesList.add(source[0]);
            source = sourcesList.toArray(new IntrospectionUtils.PropertySource[0]);
        }
    }


    public static void replaceSystemProperties() {
        Log log = LogFactory.getLog(Digester.class);
        if (propertySources != null) {
            Properties properties = System.getProperties();
            Set<String> names = properties.stringPropertyNames();
            for (String name : names) {
                String value = System.getProperty(name);
                if (value != null) {
                    try {
                        String newValue = IntrospectionUtils.replaceProperties(value, null, propertySources, null);
                        if (!value.equals(newValue)) {
                            System.setProperty(name, newValue);
                        }
                    } catch (Exception e) {
                        log.warn(sm.getString("digester.failedToUpdateSystemProperty", name, value), e);
                    }
                }
            }
        }
    }


    public void startGeneratingCode() {
        code = new StringBuilder();
    }

    public void endGeneratingCode() {
        code = null;
        known.clear();
    }

    public StringBuilder getGeneratedCode() {
        return code;
    }

    protected ArrayList<Object> known = new ArrayList<>();
    public void setKnown(Object object) {
        known.add(object);
    }
    public String toVariableName(Object object) {
        boolean found = false;
        int pos = 0;
        if (known.size() > 0) {
            for (int i = known.size() - 1; i >= 0; i--) {
                if (known.get(i) == object) {
                    pos = i;
                    found = true;
                    break;
                }
            }
        }
        if (!found) {
            pos = known.size();
            known.add(object);
        }
        return "tc_" + object.getClass().getSimpleName() + "_" + String.valueOf(pos);
    }

    // ------------------------------------------------------------- Properties

    
Return the currently mapped namespace URI for the specified prefix,
if any; otherwise return null.  These mappings come and
go dynamically as the document is parsed.
Params:
prefix – Prefix to look up
Returns:
the namespace URI/**
     * Return the currently mapped namespace URI for the specified prefix,
     * if any; otherwise return <code>null</code>.  These mappings come and
     * go dynamically as the document is parsed.
     *
     * @param prefix Prefix to look up
     * @return the namespace URI
     */
    public String findNamespaceURI(String prefix) {
        ArrayStack<String> stack = namespaces.get(prefix);
        if (stack == null) {
            return null;
        }
        try {
            return stack.peek();
        } catch (EmptyStackException e) {
            return null;
        }
    }


    
Return the class loader to be used for instantiating application objects
when required.  This is determined based upon the following rules:

The class loader set by setClassLoader(), if any
The thread context class loader, if it exists and the
    useContextClassLoader property is set to true
The class loader used to load the Digester class itself.

Returns:
the classloader/**
     * Return the class loader to be used for instantiating application objects
     * when required.  This is determined based upon the following rules:
     * <ul>
     * <li>The class loader set by <code>setClassLoader()</code>, if any</li>
     * <li>The thread context class loader, if it exists and the
     *     <code>useContextClassLoader</code> property is set to true</li>
     * <li>The class loader used to load the Digester class itself.
     * </ul>
     * @return the classloader
     */
    public ClassLoader getClassLoader() {
        if (this.classLoader != null) {
            return this.classLoader;
        }
        if (this.useContextClassLoader) {
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            if (classLoader != null) {
                return classLoader;
            }
        }
        return this.getClass().getClassLoader();
    }


    
Set the class loader to be used for instantiating application objects
when required.
Params:
classLoader – The new class loader to use, or null
 to revert to the standard rules/**
     * Set the class loader to be used for instantiating application objects
     * when required.
     *
     * @param classLoader The new class loader to use, or <code>null</code>
     *  to revert to the standard rules
     */
    public void setClassLoader(ClassLoader classLoader) {
        this.classLoader = classLoader;
    }


    
Returns:
the current depth of the element stack./**
     * @return the current depth of the element stack.
     */
    public int getCount() {
        return stack.size();
    }


    
Returns:
the name of the XML element that is currently being processed./**
     * @return the name of the XML element that is currently being processed.
     */
    public String getCurrentElementName() {
        String elementName = match;
        int lastSlash = elementName.lastIndexOf('/');
        if (lastSlash >= 0) {
            elementName = elementName.substring(lastSlash + 1);
        }
        return elementName;
    }


    
Returns:
the error handler for this Digester./**
     * @return the error handler for this Digester.
     */
    public ErrorHandler getErrorHandler() {
        return this.errorHandler;
    }


    
Set the error handler for this Digester.
Params:
errorHandler – The new error handler/**
     * Set the error handler for this Digester.
     *
     * @param errorHandler The new error handler
     */
    public void setErrorHandler(ErrorHandler errorHandler) {
        this.errorHandler = errorHandler;
    }


    
SAX parser factory method.
Throws:
ParserConfigurationException – Error creating parser
SAXNotSupportedException – Error creating parser
SAXNotRecognizedException – Error creating parser
Returns:
the SAXParserFactory we will use, creating one if necessary./**
     * SAX parser factory method.
     * @return the SAXParserFactory we will use, creating one if necessary.
     * @throws ParserConfigurationException Error creating parser
     * @throws SAXNotSupportedException Error creating parser
     * @throws SAXNotRecognizedException Error creating parser
     */
    public SAXParserFactory getFactory() throws SAXNotRecognizedException, SAXNotSupportedException,
            ParserConfigurationException {

        if (factory == null) {
            factory = SAXParserFactory.newInstance();

            factory.setNamespaceAware(namespaceAware);
            // Preserve xmlns attributes
            if (namespaceAware) {
                factory.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
            }

            factory.setValidating(validating);
            if (validating) {
                // Enable DTD validation
                factory.setFeature("http://xml.org/sax/features/validation", true);
                // Enable schema validation
                factory.setFeature("http://apache.org/xml/features/validation/schema", true);
            }
        }
        return factory;
    }


    
Sets a flag indicating whether the requested feature is supported
by the underlying implementation of org.xml.sax.XMLReader.
See 
http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description
for information about the standard SAX2 feature flags.  In order to be
effective, this method must be called before the
getParser() method is called for the first time, either
directly or indirectly.
Params:
feature – Name of the feature to set the status for
value – The new value for this feature
Throws:
ParserConfigurationException – if a parser configuration error
 occurs
SAXNotRecognizedException – if the property name is
 not recognized
SAXNotSupportedException – if the property name is
 recognized but not supported/**
     * Sets a flag indicating whether the requested feature is supported
     * by the underlying implementation of <code>org.xml.sax.XMLReader</code>.
     * See <a href="http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description">
     * http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description</a>
     * for information about the standard SAX2 feature flags.  In order to be
     * effective, this method must be called <strong>before</strong> the
     * <code>getParser()</code> method is called for the first time, either
     * directly or indirectly.
     *
     * @param feature Name of the feature to set the status for
     * @param value The new value for this feature
     *
     * @exception ParserConfigurationException if a parser configuration error
     *  occurs
     * @exception SAXNotRecognizedException if the property name is
     *  not recognized
     * @exception SAXNotSupportedException if the property name is
     *  recognized but not supported
     */
    public void setFeature(String feature, boolean value) throws ParserConfigurationException,
            SAXNotRecognizedException, SAXNotSupportedException {

        getFactory().setFeature(feature, value);

    }


    
Returns:
the current Logger associated with this instance of the Digester/**
     * @return the current Logger associated with this instance of the Digester
     */
    public Log getLogger() {

        return log;

    }


    
Set the current logger for this Digester.
Params:
log – The logger that will be used/**
     * Set the current logger for this Digester.
     * @param log The logger that will be used
     */
    public void setLogger(Log log) {

        this.log = log;

    }

    
Gets the logger used for logging SAX-related information.
Note the output is finely grained.
Since:
1.6
Returns:
the SAX logger/**
     * Gets the logger used for logging SAX-related information.
     * <strong>Note</strong> the output is finely grained.
     *
     * @since 1.6
     * @return the SAX logger
     */
    public Log getSAXLogger() {

        return saxLog;
    }


    
Sets the logger used for logging SAX-related information.
Note the output is finely grained.
Params:
saxLog – Log, not null
Since:
1.6/**
     * Sets the logger used for logging SAX-related information.
     * <strong>Note</strong> the output is finely grained.
     * @param saxLog Log, not null
     *
     * @since 1.6
     */
    public void setSAXLogger(Log saxLog) {

        this.saxLog = saxLog;
    }

    
Returns:
the current rule match path/**
     * @return the current rule match path
     */
    public String getMatch() {

        return match;

    }


    
Returns:
the "namespace aware" flag for parsers we create./**
     * @return the "namespace aware" flag for parsers we create.
     */
    public boolean getNamespaceAware() {
        return this.namespaceAware;
    }


    
Set the "namespace aware" flag for parsers we create.
Params:
namespaceAware – The new "namespace aware" flag/**
     * Set the "namespace aware" flag for parsers we create.
     *
     * @param namespaceAware The new "namespace aware" flag
     */
    public void setNamespaceAware(boolean namespaceAware) {
        this.namespaceAware = namespaceAware;
    }


    
Set the public id of the current file being parse.
Params:
publicId – the DTD/Schema public's id./**
     * Set the public id of the current file being parse.
     * @param publicId the DTD/Schema public's id.
     */
    public void setPublicId(String publicId) {
        this.publicId = publicId;
    }


    
Returns:
the public identifier of the DTD we are currently
parsing under, if any./**
     * @return the public identifier of the DTD we are currently
     * parsing under, if any.
     */
    public String getPublicId() {
        return this.publicId;
    }


    
Returns:
the SAXParser we will use to parse the input stream.  If there
is a problem creating the parser, return null./**
     * @return the SAXParser we will use to parse the input stream.  If there
     * is a problem creating the parser, return <code>null</code>.
     */
    public SAXParser getParser() {

        // Return the parser we already created (if any)
        if (parser != null) {
            return parser;
        }

        // Create a new parser
        try {
            parser = getFactory().newSAXParser();
        } catch (Exception e) {
            log.error(sm.getString("digester.createParserError"), e);
            return null;
        }

        return parser;
    }


    
Return the current value of the specified property for the underlying
XMLReader implementation.
See 
http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description
for information about the standard SAX2 properties.
Params:
property – Property name to be retrieved
Throws:
SAXNotRecognizedException – if the property name is
 not recognized
SAXNotSupportedException – if the property name is
 recognized but not supported
Returns:
the property value/**
     * Return the current value of the specified property for the underlying
     * <code>XMLReader</code> implementation.
     * See <a href="http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description">
     * http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description</a>
     * for information about the standard SAX2 properties.
     *
     * @param property Property name to be retrieved
     * @return the property value
     * @exception SAXNotRecognizedException if the property name is
     *  not recognized
     * @exception SAXNotSupportedException if the property name is
     *  recognized but not supported
     */
    public Object getProperty(String property)
            throws SAXNotRecognizedException, SAXNotSupportedException {

        return getParser().getProperty(property);
    }


    
Return the Rules implementation object containing our
rules collection and associated matching policy.  If none has been
established, a default implementation will be created and returned.
Returns:
the rules/**
     * Return the <code>Rules</code> implementation object containing our
     * rules collection and associated matching policy.  If none has been
     * established, a default implementation will be created and returned.
     * @return the rules
     */
    public Rules getRules() {
        if (this.rules == null) {
            this.rules = new RulesBase();
            this.rules.setDigester(this);
        }
        return this.rules;
    }


    
Set the Rules implementation object containing our
rules collection and associated matching policy.
Params:
rules – New Rules implementation/**
     * Set the <code>Rules</code> implementation object containing our
     * rules collection and associated matching policy.
     *
     * @param rules New Rules implementation
     */
    public void setRules(Rules rules) {
        this.rules = rules;
        this.rules.setDigester(this);
    }


    
Returns:
the boolean as to whether the context classloader should be used./**
     * @return the boolean as to whether the context classloader should be used.
     */
    public boolean getUseContextClassLoader() {
        return useContextClassLoader;
    }


    
Determine whether to use the Context ClassLoader (the one found by
calling Thread.currentThread().getContextClassLoader())
to resolve/load classes that are defined in various rules.  If not
using Context ClassLoader, then the class-loading defaults to
using the calling-class' ClassLoader.
Params:
use – determines whether to use Context ClassLoader./**
     * Determine whether to use the Context ClassLoader (the one found by
     * calling <code>Thread.currentThread().getContextClassLoader()</code>)
     * to resolve/load classes that are defined in various rules.  If not
     * using Context ClassLoader, then the class-loading defaults to
     * using the calling-class' ClassLoader.
     *
     * @param use determines whether to use Context ClassLoader.
     */
    public void setUseContextClassLoader(boolean use) {

        useContextClassLoader = use;

    }


    
Returns:
the validating parser flag./**
     * @return the validating parser flag.
     */
    public boolean getValidating() {
        return this.validating;
    }


    
Set the validating parser flag.  This must be called before
parse() is called the first time.
Params:
validating – The new validating parser flag./**
     * Set the validating parser flag.  This must be called before
     * <code>parse()</code> is called the first time.
     *
     * @param validating The new validating parser flag.
     */
    public void setValidating(boolean validating) {
        this.validating = validating;
    }


    
Returns:
the rules validation flag./**
     * @return the rules validation flag.
     */
    public boolean getRulesValidation() {
        return this.rulesValidation;
    }


    
Set the rules validation flag.  This must be called before
parse() is called the first time.
Params:
rulesValidation – The new rules validation flag./**
     * Set the rules validation flag.  This must be called before
     * <code>parse()</code> is called the first time.
     *
     * @param rulesValidation The new rules validation flag.
     */
    public void setRulesValidation(boolean rulesValidation) {
        this.rulesValidation = rulesValidation;
    }


    
Returns:
the fake attributes list./**
     * @return the fake attributes list.
     */
    public Map<Class<?>, List<String>> getFakeAttributes() {
        return this.fakeAttributes;
    }


    
Determine if an attribute is a fake attribute.
Params:
object – The object
name – The attribute name
Returns:
true if this is a fake attribute/**
     * Determine if an attribute is a fake attribute.
     * @param object The object
     * @param name The attribute name
     * @return <code>true</code> if this is a fake attribute
     */
    public boolean isFakeAttribute(Object object, String name) {
        if (fakeAttributes == null) {
            return false;
        }
        List<String> result = fakeAttributes.get(object.getClass());
        if (result == null) {
            result = fakeAttributes.get(Object.class);
        }
        if (result == null) {
            return false;
        } else {
            return result.contains(name);
        }
    }


    
Set the fake attributes.
Params:
fakeAttributes – The new fake attributes./**
     * Set the fake attributes.
     *
     * @param fakeAttributes The new fake attributes.
     */
    public void setFakeAttributes(Map<Class<?>, List<String>> fakeAttributes) {

        this.fakeAttributes = fakeAttributes;

    }


    
Return the XMLReader to be used for parsing the input document.
FIX ME: there is a bug in JAXP/XERCES that prevent the use of a
parser that contains a schema with a DTD.
Throws:
SAXException – if no XMLReader can be instantiated
Returns:
the XML reader/**
     * Return the XMLReader to be used for parsing the input document.
     *
     * FIX ME: there is a bug in JAXP/XERCES that prevent the use of a
     * parser that contains a schema with a DTD.
     * @return the XML reader
     * @exception SAXException if no XMLReader can be instantiated
     */
    public XMLReader getXMLReader() throws SAXException {
        if (reader == null) {
            reader = getParser().getXMLReader();
        }

        reader.setDTDHandler(this);
        reader.setContentHandler(this);

        EntityResolver entityResolver = getEntityResolver();
        if (entityResolver == null) {
            entityResolver = this;
        }

        // Wrap the resolver so we can perform ${...} property replacement
        if (entityResolver instanceof EntityResolver2) {
            entityResolver = new EntityResolver2Wrapper((EntityResolver2) entityResolver, source, classLoader);
        } else {
            entityResolver = new EntityResolverWrapper(entityResolver, source, classLoader);
        }

        reader.setEntityResolver(entityResolver);

        reader.setProperty("http://xml.org/sax/properties/lexical-handler", this);

        reader.setErrorHandler(this);
        return reader;
    }

    // ------------------------------------------------- ContentHandler Methods


    
Process notification of character data received from the body of
an XML element.
Params:
buffer – The characters from the XML document
start – Starting offset into the buffer
length – Number of characters from the buffer
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of character data received from the body of
     * an XML element.
     *
     * @param buffer The characters from the XML document
     * @param start Starting offset into the buffer
     * @param length Number of characters from the buffer
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void characters(char buffer[], int start, int length) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("characters(" + new String(buffer, start, length) + ")");
        }

        bodyText.append(buffer, start, length);

    }


    
Process notification of the end of the document being reached.
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of the end of the document being reached.
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void endDocument() throws SAXException {

        if (saxLog.isDebugEnabled()) {
            if (getCount() > 1) {
                saxLog.debug("endDocument():  " + getCount() + " elements left");
            } else {
                saxLog.debug("endDocument()");
            }
        }

        while (getCount() > 1) {
            pop();
        }

        // Fire "finish" events for all defined rules
        for (Rule rule : getRules().rules()) {
            try {
                rule.finish();
            } catch (Exception e) {
                log.error(sm.getString("digester.error.finish"), e);
                throw createSAXException(e);
            } catch (Error e) {
                log.error(sm.getString("digester.error.finish"), e);
                throw e;
            }
        }

        // Perform final cleanup
        clear();

    }


    
Process notification of the end of an XML element being reached.
Params:
namespaceURI – - The Namespace URI, or the empty string if the
  element has no Namespace URI or if Namespace processing is not
  being performed.
localName – - The local name (without prefix), or the empty
  string if Namespace processing is not being performed.
qName – - The qualified XML 1.0 name (with prefix), or the
  empty string if qualified names are not available.
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of the end of an XML element being reached.
     *
     * @param namespaceURI - The Namespace URI, or the empty string if the
     *   element has no Namespace URI or if Namespace processing is not
     *   being performed.
     * @param localName - The local name (without prefix), or the empty
     *   string if Namespace processing is not being performed.
     * @param qName - The qualified XML 1.0 name (with prefix), or the
     *   empty string if qualified names are not available.
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void endElement(String namespaceURI, String localName, String qName)
            throws SAXException {

        boolean debug = log.isDebugEnabled();

        if (debug) {
            if (saxLog.isDebugEnabled()) {
                saxLog.debug("endElement(" + namespaceURI + "," + localName + "," + qName + ")");
            }
            log.debug("  match='" + match + "'");
            log.debug("  bodyText='" + bodyText + "'");
        }

        // Parse system properties
        bodyText = updateBodyText(bodyText);

        // the actual element name is either in localName or qName, depending
        // on whether the parser is namespace aware
        String name = localName;
        if ((name == null) || (name.length() < 1)) {
            name = qName;
        }

        // Fire "body" events for all relevant rules
        List<Rule> rules = matches.pop();
        if ((rules != null) && (rules.size() > 0)) {
            String bodyText = this.bodyText.toString().intern();
            for (Rule value : rules) {
                try {
                    Rule rule = value;
                    if (debug) {
                        log.debug("  Fire body() for " + rule);
                    }
                    rule.body(namespaceURI, name, bodyText);
                } catch (Exception e) {
                    log.error(sm.getString("digester.error.body"), e);
                    throw createSAXException(e);
                } catch (Error e) {
                    log.error(sm.getString("digester.error.body"), e);
                    throw e;
                }
            }
        } else {
            if (debug) {
                log.debug(sm.getString("digester.noRulesFound", match));
            }
            if (rulesValidation) {
                log.warn(sm.getString("digester.noRulesFound", match));
            }
        }

        // Recover the body text from the surrounding element
        bodyText = bodyTexts.pop();

        // Fire "end" events for all relevant rules in reverse order
        if (rules != null) {
            for (int i = 0; i < rules.size(); i++) {
                int j = (rules.size() - i) - 1;
                try {
                    Rule rule = rules.get(j);
                    if (debug) {
                        log.debug("  Fire end() for " + rule);
                    }
                    rule.end(namespaceURI, name);
                } catch (Exception e) {
                    log.error(sm.getString("digester.error.end"), e);
                    throw createSAXException(e);
                } catch (Error e) {
                    log.error(sm.getString("digester.error.end"), e);
                    throw e;
                }
            }
        }

        // Recover the previous match expression
        int slash = match.lastIndexOf('/');
        if (slash >= 0) {
            match = match.substring(0, slash);
        } else {
            match = "";
        }

    }


    
Process notification that a namespace prefix is going out of scope.
Params:
prefix – Prefix that is going out of scope
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification that a namespace prefix is going out of scope.
     *
     * @param prefix Prefix that is going out of scope
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void endPrefixMapping(String prefix) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("endPrefixMapping(" + prefix + ")");
        }

        // Deregister this prefix mapping
        ArrayStack<String> stack = namespaces.get(prefix);
        if (stack == null) {
            return;
        }
        try {
            stack.pop();
            if (stack.empty())
                namespaces.remove(prefix);
        } catch (EmptyStackException e) {
            throw createSAXException(sm.getString("digester.emptyStackError"));
        }

    }


    
Process notification of ignorable whitespace received from the body of
an XML element.
Params:
buffer – The characters from the XML document
start – Starting offset into the buffer
len – Number of characters from the buffer
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of ignorable whitespace received from the body of
     * an XML element.
     *
     * @param buffer The characters from the XML document
     * @param start Starting offset into the buffer
     * @param len Number of characters from the buffer
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void ignorableWhitespace(char buffer[], int start, int len) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("ignorableWhitespace(" + new String(buffer, start, len) + ")");
        }

        // No processing required

    }


    
Process notification of a processing instruction that was encountered.
Params:
target – The processing instruction target
data – The processing instruction data (if any)
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of a processing instruction that was encountered.
     *
     * @param target The processing instruction target
     * @param data The processing instruction data (if any)
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void processingInstruction(String target, String data) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("processingInstruction('" + target + "','" + data + "')");
        }

        // No processing is required

    }


    
Gets the document locator associated with our parser.
Returns:
the Locator supplied by the document parser/**
     * Gets the document locator associated with our parser.
     *
     * @return the Locator supplied by the document parser
     */
    public Locator getDocumentLocator() {

        return locator;

    }

    
Sets the document locator associated with our parser.
Params:
locator – The new locator/**
     * Sets the document locator associated with our parser.
     *
     * @param locator The new locator
     */
    @Override
    public void setDocumentLocator(Locator locator) {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("setDocumentLocator(" + locator + ")");
        }

        this.locator = locator;

    }


    
Process notification of a skipped entity.
Params:
name – Name of the skipped entity
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of a skipped entity.
     *
     * @param name Name of the skipped entity
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void skippedEntity(String name) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("skippedEntity(" + name + ")");
        }

        // No processing required

    }


    
Process notification of the beginning of the document being reached.
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of the beginning of the document being reached.
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void startDocument() throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("startDocument()");
        }

        if (locator instanceof Locator2) {
            if (root instanceof DocumentProperties.Charset) {
                String enc = ((Locator2) locator).getEncoding();
                if (enc != null) {
                    try {
                        ((DocumentProperties.Charset) root).setCharset(B2CConverter.getCharset(enc));
                    } catch (UnsupportedEncodingException e) {
                        log.warn(sm.getString("digester.encodingInvalid", enc), e);
                    }
                }
            }
        }

        // ensure that the digester is properly configured, as
        // the digester could be used as a SAX ContentHandler
        // rather than via the parse() methods.
        configure();
    }


    
Process notification of the start of an XML element being reached.
Params:
namespaceURI – The Namespace URI, or the empty string if the element
  has no Namespace URI or if Namespace processing is not being performed.
localName – The local name (without prefix), or the empty
  string if Namespace processing is not being performed.
qName – The qualified name (with prefix), or the empty
  string if qualified names are not available.\
list – The attributes attached to the element. If there are
  no attributes, it shall be an empty Attributes object.
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification of the start of an XML element being reached.
     *
     * @param namespaceURI The Namespace URI, or the empty string if the element
     *   has no Namespace URI or if Namespace processing is not being performed.
     * @param localName The local name (without prefix), or the empty
     *   string if Namespace processing is not being performed.
     * @param qName The qualified name (with prefix), or the empty
     *   string if qualified names are not available.\
     * @param list The attributes attached to the element. If there are
     *   no attributes, it shall be an empty Attributes object.
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void startElement(String namespaceURI, String localName, String qName, Attributes list)
            throws SAXException {
        boolean debug = log.isDebugEnabled();

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("startElement(" + namespaceURI + "," + localName + "," + qName + ")");
        }

        // Parse system properties
        list = updateAttributes(list);

        // Save the body text accumulated for our surrounding element
        bodyTexts.push(bodyText);
        bodyText = new StringBuilder();

        // the actual element name is either in localName or qName, depending
        // on whether the parser is namespace aware
        String name = localName;
        if ((name == null) || (name.length() < 1)) {
            name = qName;
        }

        // Compute the current matching rule
        StringBuilder sb = new StringBuilder(match);
        if (match.length() > 0) {
            sb.append('/');
        }
        sb.append(name);
        match = sb.toString();
        if (debug) {
            log.debug("  New match='" + match + "'");
        }

        // Fire "begin" events for all relevant rules
        List<Rule> rules = getRules().match(namespaceURI, match);
        matches.push(rules);
        if ((rules != null) && (rules.size() > 0)) {
            for (Rule value : rules) {
                try {
                    Rule rule = value;
                    if (debug) {
                        log.debug("  Fire begin() for " + rule);
                    }
                    rule.begin(namespaceURI, name, list);
                } catch (Exception e) {
                    log.error(sm.getString("digester.error.begin"), e);
                    throw createSAXException(e);
                } catch (Error e) {
                    log.error(sm.getString("digester.error.begin"), e);
                    throw e;
                }
            }
        } else {
            if (debug) {
                log.debug(sm.getString("digester.noRulesFound", match));
            }
        }

    }


    
Process notification that a namespace prefix is coming in to scope.
Params:
prefix – Prefix that is being declared
namespaceURI – Corresponding namespace URI being mapped to
Throws:
SAXException – if a parsing error is to be reported/**
     * Process notification that a namespace prefix is coming in to scope.
     *
     * @param prefix Prefix that is being declared
     * @param namespaceURI Corresponding namespace URI being mapped to
     *
     * @exception SAXException if a parsing error is to be reported
     */
    @Override
    public void startPrefixMapping(String prefix, String namespaceURI) throws SAXException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("startPrefixMapping(" + prefix + "," + namespaceURI + ")");
        }

        // Register this prefix mapping
        ArrayStack<String> stack = namespaces.get(prefix);
        if (stack == null) {
            stack = new ArrayStack<>();
            namespaces.put(prefix, stack);
        }
        stack.push(namespaceURI);

    }


    // ----------------------------------------------------- DTDHandler Methods


    
Receive notification of a notation declaration event.
Params:
name – The notation name
publicId – The public identifier (if any)
systemId – The system identifier (if any)/**
     * Receive notification of a notation declaration event.
     *
     * @param name The notation name
     * @param publicId The public identifier (if any)
     * @param systemId The system identifier (if any)
     */
    @Override
    public void notationDecl(String name, String publicId, String systemId) {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("notationDecl(" + name + "," + publicId + "," + systemId + ")");
        }

    }


    
Receive notification of an unparsed entity declaration event.
Params:
name – The unparsed entity name
publicId – The public identifier (if any)
systemId – The system identifier (if any)
notation – The name of the associated notation/**
     * Receive notification of an unparsed entity declaration event.
     *
     * @param name The unparsed entity name
     * @param publicId The public identifier (if any)
     * @param systemId The system identifier (if any)
     * @param notation The name of the associated notation
     */
    @Override
    public void unparsedEntityDecl(String name, String publicId, String systemId, String notation) {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug("unparsedEntityDecl(" + name + "," + publicId + "," + systemId + ","
                    + notation + ")");
        }

    }


    // ----------------------------------------------- EntityResolver Methods

    
Set the EntityResolver used by SAX when resolving
public id and system id.
This must be called before the first call to parse().
Params:
entityResolver – a class that implement the EntityResolver interface./**
     * Set the <code>EntityResolver</code> used by SAX when resolving
     * public id and system id.
     * This must be called before the first call to <code>parse()</code>.
     * @param entityResolver a class that implement the <code>EntityResolver</code> interface.
     */
    public void setEntityResolver(EntityResolver entityResolver) {
        this.entityResolver = entityResolver;
    }


    
Return the Entity Resolver used by the SAX parser.
Returns:
Return the Entity Resolver used by the SAX parser./**
     * Return the Entity Resolver used by the SAX parser.
     * @return Return the Entity Resolver used by the SAX parser.
     */
    public EntityResolver getEntityResolver() {
        return entityResolver;
    }

    @Override
    public InputSource resolveEntity(String name, String publicId, String baseURI, String systemId)
            throws SAXException, IOException {

        if (saxLog.isDebugEnabled()) {
            saxLog.debug(
                    "resolveEntity('" + publicId + "', '" + systemId + "', '" + baseURI + "')");
        }

        // Has this system identifier been registered?
        String entityURL = null;
        if (publicId != null) {
            entityURL = entityValidator.get(publicId);
        }

        if (entityURL == null) {
            if (systemId == null) {
                // cannot resolve
                if (log.isDebugEnabled()) {
                    log.debug(" Cannot resolve entity: '" + publicId + "'");
                }
                return null;

            } else {
                // try to resolve using system ID
                if (log.isDebugEnabled()) {
                    log.debug(" Trying to resolve using system ID '" + systemId + "'");
                }
                entityURL = systemId;
                // resolve systemId against baseURI if it is not absolute
                if (baseURI != null) {
                    try {
                        URI uri = new URI(systemId);
                        if (!uri.isAbsolute()) {
                            entityURL = new URI(baseURI).resolve(uri).toString();
                        }
                    } catch (URISyntaxException e) {
                        if (log.isDebugEnabled()) {
                            log.debug("Invalid URI '" + baseURI + "' or '" + systemId + "'");
                        }
                    }
                }
            }
        }

        // Return an input source to our alternative URL
        if (log.isDebugEnabled()) {
            log.debug(" Resolving to alternate DTD '" + entityURL + "'");
        }

        try {
            return new InputSource(entityURL);
        } catch (Exception e) {
            throw createSAXException(e);
        }
    }


    // ----------------------------------------------- LexicalHandler Methods

    @Override
    public void startDTD(String name, String publicId, String systemId) throws SAXException {
        setPublicId(publicId);
    }


    // ------------------------------------------------- ErrorHandler Methods

    
Forward notification of a parsing error to the application supplied
error handler (if any).
Params:
exception – The error information
Throws:
SAXException – if a parsing exception occurs/**
     * Forward notification of a parsing error to the application supplied
     * error handler (if any).
     *
     * @param exception The error information
     *
     * @exception SAXException if a parsing exception occurs
     */
    @Override
    public void error(SAXParseException exception) throws SAXException {
        log.error(sm.getString("digester.parseError", Integer.valueOf(exception.getLineNumber()),
                Integer.valueOf(exception.getColumnNumber())), exception);
        if (errorHandler != null) {
            errorHandler.error(exception);
        }
    }


    
Forward notification of a fatal parsing error to the application
supplied error handler (if any).
Params:
exception – The fatal error information
Throws:
SAXException – if a parsing exception occurs/**
     * Forward notification of a fatal parsing error to the application
     * supplied error handler (if any).
     *
     * @param exception The fatal error information
     *
     * @exception SAXException if a parsing exception occurs
     */
    @Override
    public void fatalError(SAXParseException exception) throws SAXException {
        log.error(sm.getString("digester.parseErrorFatal", Integer.valueOf(exception.getLineNumber()),
                Integer.valueOf(exception.getColumnNumber())), exception);
        if (errorHandler != null) {
            errorHandler.fatalError(exception);
        }
    }


    
Forward notification of a parse warning to the application supplied
error handler (if any).
Params:
exception – The warning information
Throws:
SAXException – if a parsing exception occurs/**
     * Forward notification of a parse warning to the application supplied
     * error handler (if any).
     *
     * @param exception The warning information
     *
     * @exception SAXException if a parsing exception occurs
     */
    @Override
    public void warning(SAXParseException exception) throws SAXException {
        log.error(sm.getString("digester.parseWarning", Integer.valueOf(exception.getLineNumber()),
                Integer.valueOf(exception.getColumnNumber()), exception));
        if (errorHandler != null) {
            errorHandler.warning(exception);
        }

    }


    // ------------------------------------------------------- Public Methods

    
Parse the content of the specified file using this Digester.  Returns
the root element from the object stack (if any).
Params:
file – File containing the XML data to be parsed
Throws:
IOException – if an input/output error occurs
SAXException – if a parsing exception occurs
Returns:
the root object/**
     * Parse the content of the specified file using this Digester.  Returns
     * the root element from the object stack (if any).
     *
     * @param file File containing the XML data to be parsed
     * @return the root object
     * @exception IOException if an input/output error occurs
     * @exception SAXException if a parsing exception occurs
     */
    public Object parse(File file) throws IOException, SAXException {
        configure();
        InputSource input = new InputSource(new FileInputStream(file));
        input.setSystemId("file://" + file.getAbsolutePath());
        getXMLReader().parse(input);
        return root;
    }


    
Parse the content of the specified input source using this Digester.
Returns the root element from the object stack (if any).
Params:
input – Input source containing the XML data to be parsed
Throws:
IOException – if an input/output error occurs
SAXException – if a parsing exception occurs
Returns:
the root object/**
     * Parse the content of the specified input source using this Digester.
     * Returns the root element from the object stack (if any).
     *
     * @param input Input source containing the XML data to be parsed
     * @return the root object
     * @exception IOException if an input/output error occurs
     * @exception SAXException if a parsing exception occurs
     */
    public Object parse(InputSource input) throws IOException, SAXException {
        configure();
        getXMLReader().parse(input);
        return root;
    }


    
Parse the content of the specified input stream using this Digester.
Returns the root element from the object stack (if any).
Params:
input – Input stream containing the XML data to be parsed
Throws:
IOException – if an input/output error occurs
SAXException – if a parsing exception occurs
Returns:
the root object/**
     * Parse the content of the specified input stream using this Digester.
     * Returns the root element from the object stack (if any).
     *
     * @param input Input stream containing the XML data to be parsed
     * @return the root object
     * @exception IOException if an input/output error occurs
     * @exception SAXException if a parsing exception occurs
     */
    public Object parse(InputStream input) throws IOException, SAXException {
        configure();
        InputSource is = new InputSource(input);
        getXMLReader().parse(is);
        return root;
    }


    
Register the specified DTD URL for the specified public identifier.
This must be called before the first call to parse().

Digester contains an internal EntityResolver
implementation. This maps PUBLICID's to URLs
(from which the resource will be loaded). A common use case for this
method is to register local URLs (possibly computed at runtime by a
classloader) for DTDs. This allows the performance advantage of using
a local version without having to ensure every SYSTEM URI on every processed xml document is local. This implementation provides only basic functionality. If more sophisticated features are required, using setEntityResolver to set a custom resolver is recommended. 

Note: This method will have no effect when a custom
EntityResolver has been set. (Setting a custom
EntityResolver overrides the internal implementation.)

Params:
publicId – Public identifier of the DTD to be resolved
entityURL – The URL to use for reading this DTD/**
     * <p>Register the specified DTD URL for the specified public identifier.
     * This must be called before the first call to <code>parse()</code>.
     * </p><p>
     * <code>Digester</code> contains an internal <code>EntityResolver</code>
     * implementation. This maps <code>PUBLICID</code>'s to URLs
     * (from which the resource will be loaded). A common use case for this
     * method is to register local URLs (possibly computed at runtime by a
     * classloader) for DTDs. This allows the performance advantage of using
     * a local version without having to ensure every <code>SYSTEM</code>
     * URI on every processed xml document is local. This implementation provides
     * only basic functionality. If more sophisticated features are required,
     * using {@link #setEntityResolver} to set a custom resolver is recommended.
     * </p><p>
     * <strong>Note:</strong> This method will have no effect when a custom
     * <code>EntityResolver</code> has been set. (Setting a custom
     * <code>EntityResolver</code> overrides the internal implementation.)
     * </p>
     * @param publicId Public identifier of the DTD to be resolved
     * @param entityURL The URL to use for reading this DTD
     */
    public void register(String publicId, String entityURL) {

        if (log.isDebugEnabled()) {
            log.debug("register('" + publicId + "', '" + entityURL + "'");
        }
        entityValidator.put(publicId, entityURL);

    }


    // --------------------------------------------------------- Rule Methods


    
Register a new Rule matching the specified pattern.
This method sets the Digester property on the rule.
Params:
pattern – Element matching pattern
rule – Rule to be registered/**
     * <p>Register a new Rule matching the specified pattern.
     * This method sets the <code>Digester</code> property on the rule.</p>
     *
     * @param pattern Element matching pattern
     * @param rule Rule to be registered
     */
    public void addRule(String pattern, Rule rule) {

        rule.setDigester(this);
        getRules().add(pattern, rule);

    }


    
Register a set of Rule instances defined in a RuleSet.
Params:
ruleSet – The RuleSet instance to configure from/**
     * Register a set of Rule instances defined in a RuleSet.
     *
     * @param ruleSet The RuleSet instance to configure from
     */
    public void addRuleSet(RuleSet ruleSet) {
        ruleSet.addRuleInstances(this);
    }


    
Add an "call method" rule for a method which accepts no arguments.
Params:
pattern – Element matching pattern
methodName – Method name to be called
See Also:
CallMethodRule/**
     * Add an "call method" rule for a method which accepts no arguments.
     *
     * @param pattern Element matching pattern
     * @param methodName Method name to be called
     * @see CallMethodRule
     */
    public void addCallMethod(String pattern, String methodName) {

        addRule(pattern, new CallMethodRule(methodName));

    }

    
Add an "call method" rule for the specified parameters.
Params:
pattern – Element matching pattern
methodName – Method name to be called
paramCount – Number of expected parameters (or zero
 for a single parameter from the body of this element)
See Also:
CallMethodRule/**
     * Add an "call method" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param methodName Method name to be called
     * @param paramCount Number of expected parameters (or zero
     *  for a single parameter from the body of this element)
     * @see CallMethodRule
     */
    public void addCallMethod(String pattern, String methodName, int paramCount) {

        addRule(pattern, new CallMethodRule(methodName, paramCount));

    }


    
Add a "call parameter" rule for the specified parameters.
Params:
pattern – Element matching pattern
paramIndex – Zero-relative parameter index to set
 (from the body of this element)
See Also:
CallParamRule/**
     * Add a "call parameter" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param paramIndex Zero-relative parameter index to set
     *  (from the body of this element)
     * @see CallParamRule
     */
    public void addCallParam(String pattern, int paramIndex) {

        addRule(pattern, new CallParamRule(paramIndex));

    }


    
Add a "factory create" rule for the specified parameters.
Params:
pattern – Element matching pattern
creationFactory – Previously instantiated ObjectCreationFactory
 to be utilized
ignoreCreateExceptions – when true any exceptions thrown during
object creation will be ignored.
See Also:
FactoryCreateRule/**
     * Add a "factory create" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param creationFactory Previously instantiated ObjectCreationFactory
     *  to be utilized
     * @param ignoreCreateExceptions when <code>true</code> any exceptions thrown during
     * object creation will be ignored.
     * @see FactoryCreateRule
     */
    public void addFactoryCreate(String pattern, ObjectCreationFactory creationFactory,
            boolean ignoreCreateExceptions) {

        creationFactory.setDigester(this);
        addRule(pattern, new FactoryCreateRule(creationFactory, ignoreCreateExceptions));

    }

    
Add an "object create" rule for the specified parameters.
Params:
pattern – Element matching pattern
className – Java class name to be created
See Also:
ObjectCreateRule/**
     * Add an "object create" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param className Java class name to be created
     * @see ObjectCreateRule
     */
    public void addObjectCreate(String pattern, String className) {

        addRule(pattern, new ObjectCreateRule(className));

    }


    
Add an "object create" rule for the specified parameters.
Params:
pattern – Element matching pattern
className – Default Java class name to be created
attributeName – Attribute name that optionally overrides
 the default Java class name to be created
See Also:
ObjectCreateRule/**
     * Add an "object create" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param className Default Java class name to be created
     * @param attributeName Attribute name that optionally overrides
     *  the default Java class name to be created
     * @see ObjectCreateRule
     */
    public void addObjectCreate(String pattern, String className, String attributeName) {

        addRule(pattern, new ObjectCreateRule(className, attributeName));

    }


    
Add a "set next" rule for the specified parameters.
Params:
pattern – Element matching pattern
methodName – Method name to call on the parent element
paramType – Java class name of the expected parameter type
 (if you wish to use a primitive type, specify the corresponding
 Java wrapper class instead, such as java.lang.Boolean
 for a boolean parameter)
See Also:
SetNextRule/**
     * Add a "set next" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @param methodName Method name to call on the parent element
     * @param paramType Java class name of the expected parameter type
     *  (if you wish to use a primitive type, specify the corresponding
     *  Java wrapper class instead, such as <code>java.lang.Boolean</code>
     *  for a <code>boolean</code> parameter)
     * @see SetNextRule
     */
    public void addSetNext(String pattern, String methodName, String paramType) {

        addRule(pattern, new SetNextRule(methodName, paramType));

    }


    
Add a "set properties" rule for the specified parameters.
Params:
pattern – Element matching pattern
See Also:
SetPropertiesRule/**
     * Add a "set properties" rule for the specified parameters.
     *
     * @param pattern Element matching pattern
     * @see SetPropertiesRule
     */
    public void addSetProperties(String pattern) {

        addRule(pattern, new SetPropertiesRule());

    }


    public void addSetProperties(String pattern, String[] excludes) {

        addRule(pattern, new SetPropertiesRule(excludes));

    }


    // --------------------------------------------------- Object Stack Methods


    
Clear the current contents of the object stack.

Calling this method might allow another document of the same type
to be correctly parsed. However this method was not intended for this
purpose. In general, a separate Digester object should be created for
each document to be parsed.
/**
     * Clear the current contents of the object stack.
     * <p>
     * Calling this method <i>might</i> allow another document of the same type
     * to be correctly parsed. However this method was not intended for this
     * purpose. In general, a separate Digester object should be created for
     * each document to be parsed.
     */
    public void clear() {

        match = "";
        bodyTexts.clear();
        params.clear();
        publicId = null;
        stack.clear();
        log = null;
        saxLog = null;
        configured = false;

    }


    public void reset() {
        root = null;
        setErrorHandler(null);
        clear();
    }


    
Return the top object on the stack without removing it.  If there are
no objects on the stack, return null.
Returns:
the top object/**
     * Return the top object on the stack without removing it.  If there are
     * no objects on the stack, return <code>null</code>.
     * @return the top object
     */
    public Object peek() {
        try {
            return stack.peek();
        } catch (EmptyStackException e) {
            log.warn(sm.getString("digester.emptyStack"));
            return null;
        }
    }


    
Return the n'th object down the stack, where 0 is the top element
and [getCount()-1] is the bottom element.  If the specified index
is out of range, return null.
Params:
n – Index of the desired element, where 0 is the top of the stack,
 1 is the next element down, and so on.
Returns:
the specified object/**
     * Return the n'th object down the stack, where 0 is the top element
     * and [getCount()-1] is the bottom element.  If the specified index
     * is out of range, return <code>null</code>.
     *
     * @param n Index of the desired element, where 0 is the top of the stack,
     *  1 is the next element down, and so on.
     * @return the specified object
     */
    public Object peek(int n) {
        try {
            return stack.peek(n);
        } catch (EmptyStackException e) {
            log.warn(sm.getString("digester.emptyStack"));
            return null;
        }
    }


    
Pop the top object off of the stack, and return it.  If there are
no objects on the stack, return null.
Returns:
the top object/**
     * Pop the top object off of the stack, and return it.  If there are
     * no objects on the stack, return <code>null</code>.
     * @return the top object
     */
    public Object pop() {
        try {
            return stack.pop();
        } catch (EmptyStackException e) {
            log.warn(sm.getString("digester.emptyStack"));
            return null;
        }
    }


    
Push a new object onto the top of the object stack.
Params:
object – The new object/**
     * Push a new object onto the top of the object stack.
     *
     * @param object The new object
     */
    public void push(Object object) {

        if (stack.size() == 0) {
            root = object;
        }
        stack.push(object);

    }

    
When the Digester is being used as a SAXContentHandler,
this method allows you to access the root object that has been
created after parsing.
Returns:
the root object that has been created after parsing
 or null if the digester has not parsed any XML yet./**
     * When the Digester is being used as a SAXContentHandler,
     * this method allows you to access the root object that has been
     * created after parsing.
     *
     * @return the root object that has been created after parsing
     *  or null if the digester has not parsed any XML yet.
     */
    public Object getRoot() {
        return root;
    }


    // ------------------------------------------------ Parameter Stack Methods


    // ------------------------------------------------------ Protected Methods


    

Provide a hook for lazy configuration of this Digester
instance.  The default implementation does nothing, but subclasses
can override as needed.


Note This method may be called more than once.

/**
     * <p>
     * Provide a hook for lazy configuration of this <code>Digester</code>
     * instance.  The default implementation does nothing, but subclasses
     * can override as needed.
     * </p>
     *
     * <p>
     * <strong>Note</strong> This method may be called more than once.
     * </p>
     */
    protected void configure() {

        // Do not configure more than once
        if (configured) {
            return;
        }

        log = LogFactory.getLog("org.apache.tomcat.util.digester.Digester");
        saxLog = LogFactory.getLog("org.apache.tomcat.util.digester.Digester.sax");

        // Set the configuration flag to avoid repeating
        configured = true;
    }


    
Return the top object on the parameters stack without removing it.  If there are
no objects on the stack, return null.
The parameters stack is used to store CallMethodRule parameters. See params.
Returns:
the top object on the parameters stack/**
     * <p>Return the top object on the parameters stack without removing it.  If there are
     * no objects on the stack, return <code>null</code>.</p>
     *
     * <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
     * See {@link #params}.</p>
     * @return the top object on the parameters stack
     */
    public Object peekParams() {
        try {
            return params.peek();
        } catch (EmptyStackException e) {
            log.warn(sm.getString("digester.emptyStack"));
            return null;
        }
    }


    
Pop the top object off of the parameters stack, and return it.  If there are
no objects on the stack, return null.
The parameters stack is used to store CallMethodRule parameters. See params.
Returns:
the top object on the parameters stack/**
     * <p>Pop the top object off of the parameters stack, and return it.  If there are
     * no objects on the stack, return <code>null</code>.</p>
     *
     * <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
     * See {@link #params}.</p>
     * @return the top object on the parameters stack
     */
    public Object popParams() {
        try {
            if (log.isTraceEnabled()) {
                log.trace("Popping params");
            }
            return params.pop();
        } catch (EmptyStackException e) {
            log.warn(sm.getString("digester.emptyStack"));
            return null;
        }
    }


    
Push a new object onto the top of the parameters stack.
The parameters stack is used to store CallMethodRule parameters. See params.
Params:
object – The new object/**
     * <p>Push a new object onto the top of the parameters stack.</p>
     *
     * <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
     * See {@link #params}.</p>
     *
     * @param object The new object
     */
    public void pushParams(Object object) {
        if (log.isTraceEnabled()) {
            log.trace("Pushing params");
        }
        params.push(object);

    }

    
Create a SAX exception which also understands about the location in
the digester file where the exception occurs
Params:
message – The error message
e – The root cause
Returns:
the new exception/**
     * Create a SAX exception which also understands about the location in
     * the digester file where the exception occurs
     * @param message The error message
     * @param e The root cause
     * @return the new exception
     */
    public SAXException createSAXException(String message, Exception e) {
        if ((e != null) && (e instanceof InvocationTargetException)) {
            Throwable t = e.getCause();
            if (t instanceof ThreadDeath) {
                throw (ThreadDeath) t;
            }
            if (t instanceof VirtualMachineError) {
                throw (VirtualMachineError) t;
            }
            if (t instanceof Exception) {
                e = (Exception) t;
            }
        }
        if (locator != null) {
            String error = sm.getString("digester.errorLocation",
                    Integer.valueOf(locator.getLineNumber()),
                    Integer.valueOf(locator.getColumnNumber()), message);
            if (e != null) {
                return new SAXParseException(error, locator, e);
            } else {
                return new SAXParseException(error, locator);
            }
        }
        log.error(sm.getString("digester.noLocator"));
        if (e != null) {
            return new SAXException(message, e);
        } else {
            return new SAXException(message);
        }
    }

    
Create a SAX exception which also understands about the location in
the digester file where the exception occurs
Params:
e – The root cause
Returns:
the new exception/**
     * Create a SAX exception which also understands about the location in
     * the digester file where the exception occurs
     * @param e The root cause
     * @return the new exception
     */
    public SAXException createSAXException(Exception e) {
        if (e instanceof InvocationTargetException) {
            Throwable t = e.getCause();
            if (t instanceof ThreadDeath) {
                throw (ThreadDeath) t;
            }
            if (t instanceof VirtualMachineError) {
                throw (VirtualMachineError) t;
            }
            if (t instanceof Exception) {
                e = (Exception) t;
            }
        }
        return createSAXException(e.getMessage(), e);
    }

    
Create a SAX exception which also understands about the location in
the digester file where the exception occurs
Params:
message – The error message
Returns:
the new exception/**
     * Create a SAX exception which also understands about the location in
     * the digester file where the exception occurs
     * @param message The error message
     * @return the new exception
     */
    public SAXException createSAXException(String message) {
        return createSAXException(message, null);
    }


    // ------------------------------------------------------- Private Methods


   
Returns an attributes list which contains all the attributes
passed in, with any text of form "${xxx}" in an attribute value
replaced by the appropriate value from the system property.
/**
     * Returns an attributes list which contains all the attributes
     * passed in, with any text of form "${xxx}" in an attribute value
     * replaced by the appropriate value from the system property.
     */
    private Attributes updateAttributes(Attributes list) {

        if (list.getLength() == 0) {
            return list;
        }

        AttributesImpl newAttrs = new AttributesImpl(list);
        int nAttributes = newAttrs.getLength();
        for (int i = 0; i < nAttributes; ++i) {
            String value = newAttrs.getValue(i);
            try {
                newAttrs.setValue(i, IntrospectionUtils.replaceProperties(value, null, source, getClassLoader()).intern());
            } catch (Exception e) {
                log.warn(sm.getString("digester.failedToUpdateAttributes", newAttrs.getLocalName(i), value), e);
            }
        }

        return newAttrs;
    }


    
Return a new StringBuilder containing the same contents as the
input buffer, except that data of form ${varname} have been
replaced by the value of that var as defined in the system property.
/**
     * Return a new StringBuilder containing the same contents as the
     * input buffer, except that data of form ${varname} have been
     * replaced by the value of that var as defined in the system property.
     */
    private StringBuilder updateBodyText(StringBuilder bodyText) {
        String in = bodyText.toString();
        String out;
        try {
            out = IntrospectionUtils.replaceProperties(in, null, source, getClassLoader());
        } catch (Exception e) {
            return bodyText; // return unchanged data
        }

        if (out == in) {
            // No substitutions required. Don't waste memory creating
            // a new buffer
            return bodyText;
        } else {
            return new StringBuilder(out);
        }
    }


    private static class EntityResolverWrapper implements EntityResolver {

        private final EntityResolver entityResolver;
        private final PropertySource[] source;
        private final ClassLoader classLoader;

        public EntityResolverWrapper(EntityResolver entityResolver, PropertySource[] source, ClassLoader classLoader) {
            this.entityResolver = entityResolver;
            this.source = source;
            this.classLoader = classLoader;
        }

        @Override
        public InputSource resolveEntity(String publicId, String systemId)
                throws SAXException, IOException {
            publicId = replace(publicId);
            systemId = replace(systemId);
            return entityResolver.resolveEntity(publicId, systemId);
        }

        protected String replace(String input) {
            try {
                return IntrospectionUtils.replaceProperties(input, null, source, classLoader);
            } catch (Exception e) {
                return input;
            }
        }
    }


    private static class EntityResolver2Wrapper extends EntityResolverWrapper implements EntityResolver2 {

        private final EntityResolver2 entityResolver2;

        public EntityResolver2Wrapper(EntityResolver2 entityResolver, PropertySource[] source,
                ClassLoader classLoader) {
            super(entityResolver, source, classLoader);
            this.entityResolver2 = entityResolver;
        }

        @Override
        public InputSource getExternalSubset(String name, String baseURI)
                throws SAXException, IOException {
            name = replace(name);
            baseURI = replace(baseURI);
            return entityResolver2.getExternalSubset(name, baseURI);
        }

        @Override
        public InputSource resolveEntity(String name, String publicId, String baseURI,
                String systemId) throws SAXException, IOException {
            name = replace(name);
            publicId = replace(publicId);
            baseURI = replace(baseURI);
            systemId = replace(systemId);
            return entityResolver2.resolveEntity(name, publicId, baseURI, systemId);
        }
    }
}