/*
 * 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.xerces.parsers;

import java.io.IOException;
import java.util.Locale;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.XMLDTDScannerImpl;
import org.apache.xerces.impl.XMLDocumentScannerImpl;
import org.apache.xerces.impl.XMLEntityManager;
import org.apache.xerces.impl.XMLErrorReporter;
import org.apache.xerces.impl.XMLNSDocumentScannerImpl;
import org.apache.xerces.impl.dv.DTDDVFactory;
import org.apache.xerces.impl.msg.XMLMessageFormatter;
import org.apache.xerces.impl.validation.ValidationManager;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.grammars.XMLGrammarPool;
import org.apache.xerces.xni.parser.XMLComponent;
import org.apache.xerces.xni.parser.XMLComponentManager;
import org.apache.xerces.xni.parser.XMLConfigurationException;
import org.apache.xerces.xni.parser.XMLDTDScanner;
import org.apache.xerces.xni.parser.XMLDocumentScanner;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLPullParserConfiguration;

This is the non validating parser configuration. It extends the basic
configuration with the set of following parser components:
Document scanner, DTD scanner, namespace binder, document handler.

Xerces parser that uses this configuration is not conformant 
non-validating XML processor, since conformant non-validating processor is required  
to process "all the declarations they read in the internal DTD subset ... must use the information in those declarations to normalize attribute values, 
include the replacement text of internal entities, and supply default attribute values".
Author:
Elena Litani, IBM
Version:
$Id: NonValidatingConfiguration.java 713638 2008-11-13 04:42:18Z mrglavas $/**
 * This is the non validating parser configuration. It extends the basic
 * configuration with the set of following parser components:
 * Document scanner, DTD scanner, namespace binder, document handler.
 * <p>
 * Xerces parser that uses this configuration is <strong>not</strong> <a href="http://www.w3.org/TR/REC-xml#sec-conformance">conformant</a> 
 * non-validating XML processor, since conformant non-validating processor is required  
 * to process "all the declarations they read in the internal DTD subset ... must use the information in those declarations to normalize attribute values, 
 * include the replacement text of internal entities, and supply default attribute values".
 * 
 * @author Elena Litani, IBM
 * @version $Id: NonValidatingConfiguration.java 713638 2008-11-13 04:42:18Z mrglavas $
 */
public class NonValidatingConfiguration
    extends BasicParserConfiguration 
    implements XMLPullParserConfiguration {

    //
    // Constants
    //

    // feature identifiers

    
Feature identifier: warn on duplicate attribute definition. /** Feature identifier: warn on duplicate attribute definition. */
    protected static final String WARN_ON_DUPLICATE_ATTDEF =
        Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_DUPLICATE_ATTDEF_FEATURE;

    
Feature identifier: warn on duplicate entity definition. /** Feature identifier: warn on duplicate entity definition. */
    protected static final String WARN_ON_DUPLICATE_ENTITYDEF =
        Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_DUPLICATE_ENTITYDEF_FEATURE;
    
    
Feature identifier: warn on undeclared element definition. /** Feature identifier: warn on undeclared element definition. */
    protected static final String WARN_ON_UNDECLARED_ELEMDEF =
        Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_UNDECLARED_ELEMDEF_FEATURE;
    
    
Feature identifier: allow Java encodings. /** Feature identifier: allow Java encodings. */
    protected static final String ALLOW_JAVA_ENCODINGS = 
        Constants.XERCES_FEATURE_PREFIX + Constants.ALLOW_JAVA_ENCODINGS_FEATURE;
    
    
Feature identifier: continue after fatal error. /** Feature identifier: continue after fatal error. */
    protected static final String CONTINUE_AFTER_FATAL_ERROR = 
        Constants.XERCES_FEATURE_PREFIX + Constants.CONTINUE_AFTER_FATAL_ERROR_FEATURE;

    
Feature identifier: load external DTD. /** Feature identifier: load external DTD. */
    protected static final String LOAD_EXTERNAL_DTD =
        Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE;

    
Feature identifier: notify built-in refereces. /** Feature identifier: notify built-in refereces. */
    protected static final String NOTIFY_BUILTIN_REFS =
        Constants.XERCES_FEATURE_PREFIX + Constants.NOTIFY_BUILTIN_REFS_FEATURE;
    
    
Feature identifier: notify character refereces. /** Feature identifier: notify character refereces. */
    protected static final String NOTIFY_CHAR_REFS =
        Constants.XERCES_FEATURE_PREFIX + Constants.NOTIFY_CHAR_REFS_FEATURE;
    

    
Feature identifier: expose schema normalized value /** Feature identifier: expose schema normalized value */
    protected static final String NORMALIZE_DATA =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_NORMALIZED_VALUE;


    
Feature identifier: send element default value via characters() /** Feature identifier: send element default value via characters() */
    protected static final String SCHEMA_ELEMENT_DEFAULT =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_ELEMENT_DEFAULT;

    // property identifiers

    
Property identifier: error reporter. /** Property identifier: error reporter. */
    protected static final String ERROR_REPORTER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;

    
Property identifier: entity manager. /** Property identifier: entity manager. */
    protected static final String ENTITY_MANAGER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_MANAGER_PROPERTY;
    
    
Property identifier document scanner: /** Property identifier document scanner: */
    protected static final String DOCUMENT_SCANNER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.DOCUMENT_SCANNER_PROPERTY;

    
Property identifier: DTD scanner. /** Property identifier: DTD scanner. */
    protected static final String DTD_SCANNER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_SCANNER_PROPERTY;

    
Property identifier: grammar pool. /** Property identifier: grammar pool. */
    protected static final String XMLGRAMMAR_POOL = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.XMLGRAMMAR_POOL_PROPERTY;
    
    
Property identifier: DTD validator. /** Property identifier: DTD validator. */
    protected static final String DTD_VALIDATOR = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_VALIDATOR_PROPERTY;

    
Property identifier: namespace binder. /** Property identifier: namespace binder. */
    protected static final String NAMESPACE_BINDER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.NAMESPACE_BINDER_PROPERTY;

    
Property identifier: datatype validator factory. /** Property identifier: datatype validator factory. */
    protected static final String DATATYPE_VALIDATOR_FACTORY = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.DATATYPE_VALIDATOR_FACTORY_PROPERTY;

    protected static final String VALIDATION_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.VALIDATION_MANAGER_PROPERTY;

    
Property identifier: XML Schema validator. /** Property identifier: XML Schema validator. */
    protected static final String SCHEMA_VALIDATOR =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_VALIDATOR_PROPERTY;
    
    
Property identifier: locale. /** Property identifier: locale. */
    protected static final String LOCALE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.LOCALE_PROPERTY;


    // debugging

    
Set to true and recompile to print exception stack trace. /** Set to true and recompile to print exception stack trace. */
    private static final boolean PRINT_EXCEPTION_STACK_TRACE = false;

    //
    // Data
    //

    // components (non-configurable)

    
Grammar pool. /** Grammar pool. */
    protected XMLGrammarPool fGrammarPool;

    
Datatype validator factory. /** Datatype validator factory. */
    protected DTDDVFactory fDatatypeValidatorFactory;

    // components (configurable)

    
Error reporter. /** Error reporter. */
    protected XMLErrorReporter fErrorReporter;

    
Entity manager. /** Entity manager. */
    protected XMLEntityManager fEntityManager;

    
Document scanner. /** Document scanner. */
    protected XMLDocumentScanner fScanner;

    
Input Source /** Input Source */
    protected XMLInputSource fInputSource;

    
DTD scanner. /** DTD scanner. */
    protected XMLDTDScanner fDTDScanner;


    protected ValidationManager fValidationManager;

    // private data

    
Document scanner that does namespace binding. /** Document scanner that does namespace binding. */
    private XMLNSDocumentScannerImpl fNamespaceScanner;

    
Default Xerces implementation of scanner/** Default Xerces implementation of scanner*/
    private XMLDocumentScannerImpl fNonNSScanner;
    
    
	
fConfigUpdated is set to true if there has been any change to the configuration settings, 
i.e a feature or a property was changed.
/** fConfigUpdated is set to true if there has been any change to the configuration settings, 
	 * i.e a feature or a property was changed.
	 */
	protected boolean fConfigUpdated = false;


    // state

    
Locator /** Locator */
    protected XMLLocator fLocator;

    
True if a parse is in progress. This state is needed because
some features/properties cannot be set while parsing (e.g.
validation and namespaces).
/** 
     * True if a parse is in progress. This state is needed because
     * some features/properties cannot be set while parsing (e.g.
     * validation and namespaces).
     */
    protected boolean fParseInProgress = false;

    //
    // Constructors
    //

    
Default constructor. /** Default constructor. */
    public NonValidatingConfiguration() {
        this(null, null, null);
    } // <init>()

    
Constructs a parser configuration using the specified symbol table. 
Params:
symbolTable – The symbol table to use./** 
     * Constructs a parser configuration using the specified symbol table. 
     *
     * @param symbolTable The symbol table to use.
     */
    public NonValidatingConfiguration(SymbolTable symbolTable) {
        this(symbolTable, null, null);
    } // <init>(SymbolTable)

    
Constructs a parser configuration using the specified symbol table and
grammar pool.

REVISIT: 
Grammar pool will be updated when the new validation engine is
implemented.
Params:
symbolTable – The symbol table to use.
grammarPool – The grammar pool to use./**
     * Constructs a parser configuration using the specified symbol table and
     * grammar pool.
     * <p>
     * <strong>REVISIT:</strong> 
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable The symbol table to use.
     * @param grammarPool The grammar pool to use.
     */
    public NonValidatingConfiguration(SymbolTable symbolTable,
                                       XMLGrammarPool grammarPool) {
        this(symbolTable, grammarPool, null);
    } // <init>(SymbolTable,XMLGrammarPool)

    
Constructs a parser configuration using the specified symbol table,
grammar pool, and parent settings.

REVISIT: 
Grammar pool will be updated when the new validation engine is
implemented.
Params:
symbolTable –    The symbol table to use.
grammarPool –    The grammar pool to use.
parentSettings – The parent settings./**
     * Constructs a parser configuration using the specified symbol table,
     * grammar pool, and parent settings.
     * <p>
     * <strong>REVISIT:</strong> 
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable    The symbol table to use.
     * @param grammarPool    The grammar pool to use.
     * @param parentSettings The parent settings.
     */
    public NonValidatingConfiguration(SymbolTable symbolTable,
                                       XMLGrammarPool grammarPool,
                                       XMLComponentManager parentSettings) {
        super(symbolTable, parentSettings);

        // add default recognized features
        final String[] recognizedFeatures = {        	
        	PARSER_SETTINGS,
			NAMESPACES,
            //WARN_ON_DUPLICATE_ATTDEF,     // from XMLDTDScannerImpl
            //WARN_ON_UNDECLARED_ELEMDEF,   // from XMLDTDScannerImpl
            //ALLOW_JAVA_ENCODINGS,         // from XMLEntityManager
            CONTINUE_AFTER_FATAL_ERROR,
            //LOAD_EXTERNAL_DTD,    // from XMLDTDScannerImpl
            //NOTIFY_BUILTIN_REFS,  // from XMLDocumentFragmentScannerImpl
            //NOTIFY_CHAR_REFS,		// from XMLDocumentFragmentScannerImpl
            //WARN_ON_DUPLICATE_ENTITYDEF   // from XMLEntityManager
        };
        addRecognizedFeatures(recognizedFeatures);

        // set state for default features
        //setFeature(WARN_ON_DUPLICATE_ATTDEF, false);  // from XMLDTDScannerImpl
        //setFeature(WARN_ON_UNDECLARED_ELEMDEF, false);    // from XMLDTDScannerImpl
        //setFeature(ALLOW_JAVA_ENCODINGS, false);      // from XMLEntityManager
        fFeatures.put(CONTINUE_AFTER_FATAL_ERROR, Boolean.FALSE);
		fFeatures.put(PARSER_SETTINGS, Boolean.TRUE);
		fFeatures.put(NAMESPACES, Boolean.TRUE);
        //setFeature(LOAD_EXTERNAL_DTD, true);      // from XMLDTDScannerImpl
        //setFeature(NOTIFY_BUILTIN_REFS, false);   // from XMLDocumentFragmentScannerImpl
        //setFeature(NOTIFY_CHAR_REFS, false);      // from XMLDocumentFragmentScannerImpl
        //setFeature(WARN_ON_DUPLICATE_ENTITYDEF, false);   // from XMLEntityManager

        // add default recognized properties
        final String[] recognizedProperties = {
            ERROR_REPORTER,             
            ENTITY_MANAGER, 
            DOCUMENT_SCANNER,
            DTD_SCANNER,
            DTD_VALIDATOR,
            NAMESPACE_BINDER,
            XMLGRAMMAR_POOL,   
            DATATYPE_VALIDATOR_FACTORY,
            VALIDATION_MANAGER,
            LOCALE
        };
        addRecognizedProperties(recognizedProperties);
	
        fGrammarPool = grammarPool;
        if(fGrammarPool != null){
			fProperties.put(XMLGRAMMAR_POOL, fGrammarPool);
        }

        fEntityManager = createEntityManager();
		fProperties.put(ENTITY_MANAGER, fEntityManager);
        addComponent(fEntityManager);

        fErrorReporter = createErrorReporter();
        fErrorReporter.setDocumentLocator(fEntityManager.getEntityScanner());
		fProperties.put(ERROR_REPORTER, fErrorReporter);
        addComponent(fErrorReporter);

        // this configuration delays creation of the scanner
        // till it is known if namespace processing should be performed

        fDTDScanner = createDTDScanner();
        if (fDTDScanner != null) {
			fProperties.put(DTD_SCANNER, fDTDScanner);
            if (fDTDScanner instanceof XMLComponent) {
                addComponent((XMLComponent)fDTDScanner);
            }
        }

        fDatatypeValidatorFactory = createDatatypeValidatorFactory();
        if (fDatatypeValidatorFactory != null) {
			fProperties.put(DATATYPE_VALIDATOR_FACTORY,
                        fDatatypeValidatorFactory);
        }
        fValidationManager = createValidationManager();

        if (fValidationManager != null) {
			fProperties.put(VALIDATION_MANAGER, fValidationManager);
        }
        // add message formatters
        if (fErrorReporter.getMessageFormatter(XMLMessageFormatter.XML_DOMAIN) == null) {
            XMLMessageFormatter xmft = new XMLMessageFormatter();
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XML_DOMAIN, xmft);
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XMLNS_DOMAIN, xmft);
        }
        
		fConfigUpdated = false;

        // set locale
        try {
            setLocale(Locale.getDefault());
        }
        catch (XNIException e) {
            // do nothing
            // REVISIT: What is the right thing to do? -Ac
        }

    } // <init>(SymbolTable,XMLGrammarPool)

    //
    // Public methods
    //
	public void setFeature(String featureId, boolean state)
		throws XMLConfigurationException {
		fConfigUpdated = true;
		super.setFeature(featureId, state);
	}
	
	public Object getProperty(String propertyId)
	    throws XMLConfigurationException {
	    if (LOCALE.equals(propertyId)) {
	        return getLocale();
	    }
	    return super.getProperty(propertyId);
	}
	
	public void setProperty(String propertyId, Object value)
	    throws XMLConfigurationException {
	    fConfigUpdated = true;
        if (LOCALE.equals(propertyId)) {
            setLocale((Locale) value);
        }
	    super.setProperty(propertyId, value);
	}
	
    
Set the locale to use for messages.
Params:
locale – The locale object to use for localization of messages.
Throws:
XNIException – Thrown if the parser does not support the
                        specified locale./**
     * Set the locale to use for messages.
     *
     * @param locale The locale object to use for localization of messages.
     *
     * @exception XNIException Thrown if the parser does not support the
     *                         specified locale.
     */
    public void setLocale(Locale locale) throws XNIException {
        super.setLocale(locale);
        fErrorReporter.setLocale(locale);
    } // setLocale(Locale)
    
	public boolean getFeature(String featureId)
		throws XMLConfigurationException {
			// make this feature special
		if (featureId.equals(PARSER_SETTINGS)){
			return fConfigUpdated;
		}
		return super.getFeature(featureId);

	} // getFeature(String):boolean
    //
    // XMLPullParserConfiguration methods
    //

    // parsing

    
Sets the input source for the document to parse.
Params:
inputSource – The document's input source.
Throws:
XMLConfigurationException – Thrown if there is a 
                       configuration error when initializing the
                       parser.
IOException – Thrown on I/O error.
See Also:
parse(boolean)/**
     * Sets the input source for the document to parse.
     *
     * @param inputSource The document's input source.
     *
     * @exception XMLConfigurationException Thrown if there is a 
     *                        configuration error when initializing the
     *                        parser.
     * @exception IOException Thrown on I/O error.
     *
     * @see #parse(boolean)
     */
    public void setInputSource(XMLInputSource inputSource)
        throws XMLConfigurationException, IOException {
        
        // REVISIT: this method used to reset all the components and
        //          construct the pipeline. Now reset() is called
        //          in parse (boolean) just before we parse the document
        //          Should this method still throw exceptions..?

        fInputSource = inputSource;
        
    } // setInputSource(XMLInputSource)

    
Parses the document in a pull parsing fashion.
Params:
complete – True if the pull parser should parse the
                remaining document completely.
Throws:
XNIException – Any XNI exception, possibly wrapping 
                        another exception.
IOException –  An IO exception from the parser, possibly
                        from a byte stream or character stream
                        supplied by the parser.
See Also:
setInputSource
Returns:
True if there is more document to parse./**
     * Parses the document in a pull parsing fashion.
     *
     * @param complete True if the pull parser should parse the
     *                 remaining document completely.
     *
     * @return True if there is more document to parse.
     *
     * @exception XNIException Any XNI exception, possibly wrapping 
     *                         another exception.
     * @exception IOException  An IO exception from the parser, possibly
     *                         from a byte stream or character stream
     *                         supplied by the parser.
     *
     * @see #setInputSource
     */
    public boolean parse(boolean complete) throws XNIException, IOException {
        //
        // reset and configure pipeline and set InputSource.
        if (fInputSource !=null) {
            try {
                // resets and sets the pipeline.
                reset();
                fScanner.setInputSource(fInputSource);
                fInputSource = null;
            } 
            catch (XNIException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } 
            catch (IOException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } 
            catch (RuntimeException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            }
            catch (Exception ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw new XNIException(ex);
            }
        }

        try {
            return fScanner.scanDocument(complete);
        } 
        catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } 
        catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } 
        catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        }
        catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        }

    } // parse(boolean):boolean

    
If the application decides to terminate parsing before the xml document
is fully parsed, the application should call this method to free any
resource allocated during parsing. For example, close all opened streams.
/**
     * If the application decides to terminate parsing before the xml document
     * is fully parsed, the application should call this method to free any
     * resource allocated during parsing. For example, close all opened streams.
     */
    public void cleanup() {
        fEntityManager.closeReaders();
    }
    
    //
    // XMLParserConfiguration methods
    //

    
Parses the specified input source.
Params:
source – The input source.
Throws:
XNIException – Throws exception on XNI error.
IOException – Throws exception on i/o error./**
     * Parses the specified input source.
     *
     * @param source The input source.
     *
     * @exception XNIException Throws exception on XNI error.
     * @exception java.io.IOException Throws exception on i/o error.
     */
    public void parse(XMLInputSource source) throws XNIException, IOException {

        if (fParseInProgress) {
            // REVISIT - need to add new error message
            throw new XNIException("FWK005 parse may not be called while parsing.");
        }
        fParseInProgress = true;

        try {
            setInputSource(source);
            parse(true);
        } 
        catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } 
        catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        }
        catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        }              
        catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        }
        finally {
            fParseInProgress = false;
            // close all streams opened by xerces
            this.cleanup();
        }

    } // parse(InputSource)

    //
    // Protected methods
    //
    
    
Reset all components before parsing. 
Throws:
XNIException – Thrown if an error occurs during initialization./** 
     * Reset all components before parsing. 
     *
     * @throws XNIException Thrown if an error occurs during initialization.
     */
    protected void reset() throws XNIException {

        if (fValidationManager != null)
            fValidationManager.reset();
        // configure the pipeline and initialize the components
        configurePipeline();
        super.reset();

    } // reset()

    
Configures the pipeline. /** Configures the pipeline. */
    protected void configurePipeline() {
        // create appropriate scanner
        // and register it as one of the components.
        if (fFeatures.get(NAMESPACES) == Boolean.TRUE) {
            if (fNamespaceScanner == null) {
                fNamespaceScanner = new XMLNSDocumentScannerImpl();
                addComponent((XMLComponent)fNamespaceScanner);
            }
            fProperties.put(DOCUMENT_SCANNER, fNamespaceScanner);
            fNamespaceScanner.setDTDValidator(null);
            fScanner = fNamespaceScanner;
        } 
        else {
            if (fNonNSScanner == null) {
                fNonNSScanner = new XMLDocumentScannerImpl();
                addComponent((XMLComponent)fNonNSScanner);
            }
            fProperties.put(DOCUMENT_SCANNER, fNonNSScanner);
            fScanner = fNonNSScanner;
        }

        fScanner.setDocumentHandler(fDocumentHandler);
        fLastComponent = fScanner;
        // setup dtd pipeline
        if (fDTDScanner != null) {
                fDTDScanner.setDTDHandler(fDTDHandler);
                fDTDScanner.setDTDContentModelHandler(fDTDContentModelHandler);
        }


    } // configurePipeline()

    // features and properties

    
Check a feature. If feature is know and supported, this method simply
returns. Otherwise, the appropriate exception is thrown.
Params:
featureId – The unique identifier (URI) of the feature.
Throws:
XMLConfigurationException – Thrown for configuration error.
                                  In general, components should
                                  only throw this exception if
                                  it is really
                                  a critical error./**
     * Check a feature. If feature is know and supported, this method simply
     * returns. Otherwise, the appropriate exception is thrown.
     *
     * @param featureId The unique identifier (URI) of the feature.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkFeature(String featureId)
        throws XMLConfigurationException {

        //
        // Xerces Features
        //

        if (featureId.startsWith(Constants.XERCES_FEATURE_PREFIX)) {
            final int suffixLength = featureId.length() - Constants.XERCES_FEATURE_PREFIX.length();
        	
            //
            // http://apache.org/xml/features/validation/dynamic
            //   Allows the parser to validate a document only when it
            //   contains a grammar. Validation is turned on/off based
            //   on each document instance, automatically.
            //
            if (suffixLength == Constants.DYNAMIC_VALIDATION_FEATURE.length() && 
                featureId.endsWith(Constants.DYNAMIC_VALIDATION_FEATURE)) {
                return;
            }
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE.length() && 
                featureId.endsWith(Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_CONTENT_MODELS_FEATURE.length() && 
                featureId.endsWith(Constants.VALIDATE_CONTENT_MODELS_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-dtd-grammar
            //
            if (suffixLength == Constants.LOAD_DTD_GRAMMAR_FEATURE.length() && 
                featureId.endsWith(Constants.LOAD_DTD_GRAMMAR_FEATURE)) {
                return;
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-external-dtd
            //
            if (suffixLength == Constants.LOAD_EXTERNAL_DTD_FEATURE.length() && 
                featureId.endsWith(Constants.LOAD_EXTERNAL_DTD_FEATURE)) {
                return;
            }

            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_DATATYPES_FEATURE.length() && 
                featureId.endsWith(Constants.VALIDATE_DATATYPES_FEATURE)) {
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
        }

        //
        // Not recognized
        //

        super.checkFeature(featureId);

    } // checkFeature(String)

    
Check a property. If the property is know and supported, this method
simply returns. Otherwise, the appropriate exception is thrown.
Params:
propertyId – The unique identifier (URI) of the property
                  being set.
Throws:
XMLConfigurationException – Thrown for configuration error.
                                  In general, components should
                                  only throw this exception if
                                  it is really
                                  a critical error./**
     * Check a property. If the property is know and supported, this method
     * simply returns. Otherwise, the appropriate exception is thrown.
     *
     * @param propertyId The unique identifier (URI) of the property
     *                   being set.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkProperty(String propertyId)
        throws XMLConfigurationException {

        //
        // Xerces Properties
        //

        if (propertyId.startsWith(Constants.XERCES_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.XERCES_PROPERTY_PREFIX.length();
            
            if (suffixLength == Constants.DTD_SCANNER_PROPERTY.length() && 
                propertyId.endsWith(Constants.DTD_SCANNER_PROPERTY)) {
                return;
            }
        }

        if (propertyId.startsWith(Constants.JAXP_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.JAXP_PROPERTY_PREFIX.length();

            if (suffixLength == Constants.SCHEMA_SOURCE.length() && 
                propertyId.endsWith(Constants.SCHEMA_SOURCE)) {
                return;
            }
        }

        //
        // Not recognized
        //

        super.checkProperty(propertyId);

    } // checkProperty(String)

    // factory methods

    
Creates an entity manager. /** Creates an entity manager. */
    protected XMLEntityManager createEntityManager() {
        return new XMLEntityManager();
    } // createEntityManager():XMLEntityManager

    
Creates an error reporter. /** Creates an error reporter. */
    protected XMLErrorReporter createErrorReporter() {
        return new XMLErrorReporter();
    } // createErrorReporter():XMLErrorReporter

    
Create a document scanner. /** Create a document scanner. */
    protected XMLDocumentScanner createDocumentScanner() {
        return null;
    } // createDocumentScanner():XMLDocumentScanner

    
Create a DTD scanner. /** Create a DTD scanner. */
    protected XMLDTDScanner createDTDScanner() {
        return new XMLDTDScannerImpl();
    } // createDTDScanner():XMLDTDScanner

    
Create a datatype validator factory. /** Create a datatype validator factory. */
    protected DTDDVFactory createDatatypeValidatorFactory() {
        return DTDDVFactory.getInstance();
    } // createDatatypeValidatorFactory():DatatypeValidatorFactory
    protected ValidationManager createValidationManager(){
        return new ValidationManager();
    }

} // class NonValidatingConfiguration