https://github.com/spring-projects/spring-framework: Spring Beans (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2020 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.beans.factory.xml;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.Set;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.parsing.EmptyReaderEventListener;
import org.springframework.beans.factory.parsing.FailFastProblemReporter;
import org.springframework.beans.factory.parsing.NullSourceExtractor;
import org.springframework.beans.factory.parsing.ProblemReporter;
import org.springframework.beans.factory.parsing.ReaderEventListener;
import org.springframework.beans.factory.parsing.SourceExtractor;
import org.springframework.beans.factory.support.AbstractBeanDefinitionReader;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.core.Constants;
import org.springframework.core.NamedThreadLocal;
import org.springframework.core.io.DescriptiveResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.xml.SimpleSaxErrorHandler;
import org.springframework.util.xml.XmlValidationModeDetector;


Bean definition reader for XML bean definitions. Delegates the actual XML document reading to an implementation of the BeanDefinitionDocumentReader interface. 
Typically applied to a DefaultListableBeanFactory or a GenericApplicationContext. 
This class loads a DOM document and applies the BeanDefinitionDocumentReader to it. The document reader will register each bean definition with the given bean factory, talking to the latter's implementation of the BeanDefinitionRegistry interface. 
Author:Juergen Hoeller, Rob Harrop, Chris Beams
See Also:
Since:26.11.2003
/**
 * Bean definition reader for XML bean definitions.
 * Delegates the actual XML document reading to an implementation
 * of the {@link BeanDefinitionDocumentReader} interface.
 *
 * <p>Typically applied to a
 * {@link org.springframework.beans.factory.support.DefaultListableBeanFactory}
 * or a {@link org.springframework.context.support.GenericApplicationContext}.
 *
 * <p>This class loads a DOM document and applies the BeanDefinitionDocumentReader to it.
 * The document reader will register each bean definition with the given bean factory,
 * talking to the latter's implementation of the
 * {@link org.springframework.beans.factory.support.BeanDefinitionRegistry} interface.
 *
 * @author Juergen Hoeller
 * @author Rob Harrop
 * @author Chris Beams
 * @since 26.11.2003
 * @see #setDocumentReaderClass
 * @see BeanDefinitionDocumentReader
 * @see DefaultBeanDefinitionDocumentReader
 * @see BeanDefinitionRegistry
 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory
 * @see org.springframework.context.support.GenericApplicationContext
 */
public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {

	
Indicates that the validation should be disabled.

/**
	 * Indicates that the validation should be disabled.
	 */
	public static final int VALIDATION_NONE = XmlValidationModeDetector.VALIDATION_NONE;

	
Indicates that the validation mode should be detected automatically.

/**
	 * Indicates that the validation mode should be detected automatically.
	 */
	public static final int VALIDATION_AUTO = XmlValidationModeDetector.VALIDATION_AUTO;

	
Indicates that DTD validation should be used.

/**
	 * Indicates that DTD validation should be used.
	 */
	public static final int VALIDATION_DTD = XmlValidationModeDetector.VALIDATION_DTD;

	
Indicates that XSD validation should be used.

/**
	 * Indicates that XSD validation should be used.
	 */
	public static final int VALIDATION_XSD = XmlValidationModeDetector.VALIDATION_XSD;


	
Constants instance for this class. 
/** Constants instance for this class. */
	private static final Constants constants = new Constants(XmlBeanDefinitionReader.class);

	private int validationMode = VALIDATION_AUTO;

	private boolean namespaceAware = false;

	private Class<? extends BeanDefinitionDocumentReader> documentReaderClass =
			DefaultBeanDefinitionDocumentReader.class;

	private ProblemReporter problemReporter = new FailFastProblemReporter();

	private ReaderEventListener eventListener = new EmptyReaderEventListener();

	private SourceExtractor sourceExtractor = new NullSourceExtractor();

	@Nullable
	private NamespaceHandlerResolver namespaceHandlerResolver;

	private DocumentLoader documentLoader = new DefaultDocumentLoader();

	@Nullable
	private EntityResolver entityResolver;

	private ErrorHandler errorHandler = new SimpleSaxErrorHandler(logger);

	private final XmlValidationModeDetector validationModeDetector = new XmlValidationModeDetector();

	private final ThreadLocal<Set<EncodedResource>> resourcesCurrentlyBeingLoaded =
			new NamedThreadLocal<Set<EncodedResource>>("XML bean definition resources currently being loaded"){
				@Override
				protected Set<EncodedResource> initialValue() {
					return new HashSet<>(4);
				}
			};


	
Create new XmlBeanDefinitionReader for the given bean factory.

Params:
  • registry – the BeanFactory to load bean definitions into,
in the form of a BeanDefinitionRegistry
/**
	 * Create new XmlBeanDefinitionReader for the given bean factory.
	 * @param registry the BeanFactory to load bean definitions into,
	 * in the form of a BeanDefinitionRegistry
	 */
	public XmlBeanDefinitionReader(BeanDefinitionRegistry registry) {
		super(registry);
	}


	
Set whether to use XML validation. Default is true. 
This method switches namespace awareness on if validation is turned off,
in order to still process schema namespaces properly in such a scenario.

See Also:
/**
	 * Set whether to use XML validation. Default is {@code true}.
	 * <p>This method switches namespace awareness on if validation is turned off,
	 * in order to still process schema namespaces properly in such a scenario.
	 * @see #setValidationMode
	 * @see #setNamespaceAware
	 */
	public void setValidating(boolean validating) {
		this.validationMode = (validating ? VALIDATION_AUTO : VALIDATION_NONE);
		this.namespaceAware = !validating;
	}

	
Set the validation mode to use by name. Defaults to VALIDATION_AUTO. 
See Also:
/**
	 * Set the validation mode to use by name. Defaults to {@link #VALIDATION_AUTO}.
	 * @see #setValidationMode
	 */
	public void setValidationModeName(String validationModeName) {
		setValidationMode(constants.asNumber(validationModeName).intValue());
	}

	
Set the validation mode to use. Defaults to VALIDATION_AUTO. 
Note that this only activates or deactivates validation itself. If you are switching validation off for schema files, you might need to activate schema namespace support explicitly: see setNamespaceAware. 
/**
	 * Set the validation mode to use. Defaults to {@link #VALIDATION_AUTO}.
	 * <p>Note that this only activates or deactivates validation itself.
	 * If you are switching validation off for schema files, you might need to
	 * activate schema namespace support explicitly: see {@link #setNamespaceAware}.
	 */
	public void setValidationMode(int validationMode) {
		this.validationMode = validationMode;
	}

	
Return the validation mode to use.

/**
	 * Return the validation mode to use.
	 */
	public int getValidationMode() {
		return this.validationMode;
	}

	
Set whether or not the XML parser should be XML namespace aware.
Default is "false".

This is typically not needed when schema validation is active.
However, without validation, this has to be switched to "true"
in order to properly process schema namespaces.

/**
	 * Set whether or not the XML parser should be XML namespace aware.
	 * Default is "false".
	 * <p>This is typically not needed when schema validation is active.
	 * However, without validation, this has to be switched to "true"
	 * in order to properly process schema namespaces.
	 */
	public void setNamespaceAware(boolean namespaceAware) {
		this.namespaceAware = namespaceAware;
	}

	
Return whether or not the XML parser should be XML namespace aware.

/**
	 * Return whether or not the XML parser should be XML namespace aware.
	 */
	public boolean isNamespaceAware() {
		return this.namespaceAware;
	}

	
Specify which ProblemReporter to use. 
The default implementation is FailFastProblemReporter which exhibits fail fast behaviour. External tools can provide an alternative implementation that collates errors and warnings for display in the tool UI. 
/**
	 * Specify which {@link org.springframework.beans.factory.parsing.ProblemReporter} to use.
	 * <p>The default implementation is {@link org.springframework.beans.factory.parsing.FailFastProblemReporter}
	 * which exhibits fail fast behaviour. External tools can provide an alternative implementation
	 * that collates errors and warnings for display in the tool UI.
	 */
	public void setProblemReporter(@Nullable ProblemReporter problemReporter) {
		this.problemReporter = (problemReporter != null ? problemReporter : new FailFastProblemReporter());
	}

	
Specify which ReaderEventListener to use. 
The default implementation is EmptyReaderEventListener which discards every event notification.
External tools can provide an alternative implementation to monitor the components being
registered in the BeanFactory.

/**
	 * Specify which {@link ReaderEventListener} to use.
	 * <p>The default implementation is EmptyReaderEventListener which discards every event notification.
	 * External tools can provide an alternative implementation to monitor the components being
	 * registered in the BeanFactory.
	 */
	public void setEventListener(@Nullable ReaderEventListener eventListener) {
		this.eventListener = (eventListener != null ? eventListener : new EmptyReaderEventListener());
	}

	
Specify the SourceExtractor to use. 
The default implementation is NullSourceExtractor which simply returns null as the source object. This means that - during normal runtime execution - no additional source metadata is attached to the bean configuration metadata. 
/**
	 * Specify the {@link SourceExtractor} to use.
	 * <p>The default implementation is {@link NullSourceExtractor} which simply returns {@code null}
	 * as the source object. This means that - during normal runtime execution -
	 * no additional source metadata is attached to the bean configuration metadata.
	 */
	public void setSourceExtractor(@Nullable SourceExtractor sourceExtractor) {
		this.sourceExtractor = (sourceExtractor != null ? sourceExtractor : new NullSourceExtractor());
	}

	
Specify the NamespaceHandlerResolver to use. 
If none is specified, a default instance will be created through createDefaultNamespaceHandlerResolver(). 
/**
	 * Specify the {@link NamespaceHandlerResolver} to use.
	 * <p>If none is specified, a default instance will be created through
	 * {@link #createDefaultNamespaceHandlerResolver()}.
	 */
	public void setNamespaceHandlerResolver(@Nullable NamespaceHandlerResolver namespaceHandlerResolver) {
		this.namespaceHandlerResolver = namespaceHandlerResolver;
	}

	
Specify the DocumentLoader to use. 
The default implementation is DefaultDocumentLoader which loads Document instances using JAXP. 
/**
	 * Specify the {@link DocumentLoader} to use.
	 * <p>The default implementation is {@link DefaultDocumentLoader}
	 * which loads {@link Document} instances using JAXP.
	 */
	public void setDocumentLoader(@Nullable DocumentLoader documentLoader) {
		this.documentLoader = (documentLoader != null ? documentLoader : new DefaultDocumentLoader());
	}

	
Set a SAX entity resolver to be used for parsing.

By default, ResourceEntityResolver will be used. Can be overridden for custom entity resolution, for example relative to some specific base path. 
/**
	 * Set a SAX entity resolver to be used for parsing.
	 * <p>By default, {@link ResourceEntityResolver} will be used. Can be overridden
	 * for custom entity resolution, for example relative to some specific base path.
	 */
	public void setEntityResolver(@Nullable EntityResolver entityResolver) {
		this.entityResolver = entityResolver;
	}

	
Return the EntityResolver to use, building a default resolver
if none specified.

/**
	 * Return the EntityResolver to use, building a default resolver
	 * if none specified.
	 */
	protected EntityResolver getEntityResolver() {
		if (this.entityResolver == null) {
			// Determine default EntityResolver to use.
			ResourceLoader resourceLoader = getResourceLoader();
			if (resourceLoader != null) {
				this.entityResolver = new ResourceEntityResolver(resourceLoader);
			}
			else {
				this.entityResolver = new DelegatingEntityResolver(getBeanClassLoader());
			}
		}
		return this.entityResolver;
	}

	
Set an implementation of the org.xml.sax.ErrorHandler interface for custom handling of XML parsing errors and warnings. 
If not set, a default SimpleSaxErrorHandler is used that simply
logs warnings using the logger instance of the view class,
and rethrows errors to discontinue the XML transformation.

See Also:
/**
	 * Set an implementation of the {@code org.xml.sax.ErrorHandler}
	 * interface for custom handling of XML parsing errors and warnings.
	 * <p>If not set, a default SimpleSaxErrorHandler is used that simply
	 * logs warnings using the logger instance of the view class,
	 * and rethrows errors to discontinue the XML transformation.
	 * @see SimpleSaxErrorHandler
	 */
	public void setErrorHandler(ErrorHandler errorHandler) {
		this.errorHandler = errorHandler;
	}

	
Specify the BeanDefinitionDocumentReader implementation to use, responsible for the actual reading of the XML bean definition document. 
The default is DefaultBeanDefinitionDocumentReader. 
Params:
  • documentReaderClass – the desired BeanDefinitionDocumentReader implementation class
/**
	 * Specify the {@link BeanDefinitionDocumentReader} implementation to use,
	 * responsible for the actual reading of the XML bean definition document.
	 * <p>The default is {@link DefaultBeanDefinitionDocumentReader}.
	 * @param documentReaderClass the desired BeanDefinitionDocumentReader implementation class
	 */
	public void setDocumentReaderClass(Class<? extends BeanDefinitionDocumentReader> documentReaderClass) {
		this.documentReaderClass = documentReaderClass;
	}


	
Load bean definitions from the specified XML file.

Params:
  • resource – the resource descriptor for the XML file
Throws:
Returns:the number of bean definitions found
/**
	 * Load bean definitions from the specified XML file.
	 * @param resource the resource descriptor for the XML file
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 */
	@Override
	public int loadBeanDefinitions(Resource resource) throws BeanDefinitionStoreException {
		return loadBeanDefinitions(new EncodedResource(resource));
	}

	
Load bean definitions from the specified XML file.

Params:
  • encodedResource – the resource descriptor for the XML file,
allowing to specify an encoding to use for parsing the file
Throws:
Returns:the number of bean definitions found
/**
	 * Load bean definitions from the specified XML file.
	 * @param encodedResource the resource descriptor for the XML file,
	 * allowing to specify an encoding to use for parsing the file
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 */
	public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {
		Assert.notNull(encodedResource, "EncodedResource must not be null");
		if (logger.isTraceEnabled()) {
			logger.trace("Loading XML bean definitions from " + encodedResource);
		}

		Set<EncodedResource> currentResources = this.resourcesCurrentlyBeingLoaded.get();

		if (!currentResources.add(encodedResource)) {
			throw new BeanDefinitionStoreException(
					"Detected cyclic loading of " + encodedResource + " - check your import definitions!");
		}

		try (InputStream inputStream = encodedResource.getResource().getInputStream()) {
			InputSource inputSource = new InputSource(inputStream);
			if (encodedResource.getEncoding() != null) {
				inputSource.setEncoding(encodedResource.getEncoding());
			}
			return doLoadBeanDefinitions(inputSource, encodedResource.getResource());
		}
		catch (IOException ex) {
			throw new BeanDefinitionStoreException(
					"IOException parsing XML document from " + encodedResource.getResource(), ex);
		}
		finally {
			currentResources.remove(encodedResource);
			if (currentResources.isEmpty()) {
				this.resourcesCurrentlyBeingLoaded.remove();
			}
		}
	}

	
Load bean definitions from the specified XML file.

Params:
  • inputSource – the SAX InputSource to read from
Throws:
Returns:the number of bean definitions found
/**
	 * Load bean definitions from the specified XML file.
	 * @param inputSource the SAX InputSource to read from
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 */
	public int loadBeanDefinitions(InputSource inputSource) throws BeanDefinitionStoreException {
		return loadBeanDefinitions(inputSource, "resource loaded through SAX InputSource");
	}

	
Load bean definitions from the specified XML file.

Params:
  • inputSource – the SAX InputSource to read from
  • resourceDescription – a description of the resource (can be null or empty)
Throws:
Returns:the number of bean definitions found
/**
	 * Load bean definitions from the specified XML file.
	 * @param inputSource the SAX InputSource to read from
	 * @param resourceDescription a description of the resource
	 * (can be {@code null} or empty)
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 */
	public int loadBeanDefinitions(InputSource inputSource, @Nullable String resourceDescription)
			throws BeanDefinitionStoreException {

		return doLoadBeanDefinitions(inputSource, new DescriptiveResource(resourceDescription));
	}


	
Actually load bean definitions from the specified XML file.

Params:
  • inputSource – the SAX InputSource to read from
  • resource – the resource descriptor for the XML file
Throws:
See Also:
Returns:the number of bean definitions found
/**
	 * Actually load bean definitions from the specified XML file.
	 * @param inputSource the SAX InputSource to read from
	 * @param resource the resource descriptor for the XML file
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 * @see #doLoadDocument
	 * @see #registerBeanDefinitions
	 */
	protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource)
			throws BeanDefinitionStoreException {

		try {
			Document doc = doLoadDocument(inputSource, resource);
			int count = registerBeanDefinitions(doc, resource);
			if (logger.isDebugEnabled()) {
				logger.debug("Loaded " + count + " bean definitions from " + resource);
			}
			return count;
		}
		catch (BeanDefinitionStoreException ex) {
			throw ex;
		}
		catch (SAXParseException ex) {
			throw new XmlBeanDefinitionStoreException(resource.getDescription(),
					"Line " + ex.getLineNumber() + " in XML document from " + resource + " is invalid", ex);
		}
		catch (SAXException ex) {
			throw new XmlBeanDefinitionStoreException(resource.getDescription(),
					"XML document from " + resource + " is invalid", ex);
		}
		catch (ParserConfigurationException ex) {
			throw new BeanDefinitionStoreException(resource.getDescription(),
					"Parser configuration exception parsing XML from " + resource, ex);
		}
		catch (IOException ex) {
			throw new BeanDefinitionStoreException(resource.getDescription(),
					"IOException parsing XML document from " + resource, ex);
		}
		catch (Throwable ex) {
			throw new BeanDefinitionStoreException(resource.getDescription(),
					"Unexpected exception parsing XML document from " + resource, ex);
		}
	}

	
Actually load the specified document using the configured DocumentLoader.

Params:
  • inputSource – the SAX InputSource to read from
  • resource – the resource descriptor for the XML file
Throws:
  • Exception – when thrown from the DocumentLoader
See Also:
Returns:the DOM Document
/**
	 * Actually load the specified document using the configured DocumentLoader.
	 * @param inputSource the SAX InputSource to read from
	 * @param resource the resource descriptor for the XML file
	 * @return the DOM Document
	 * @throws Exception when thrown from the DocumentLoader
	 * @see #setDocumentLoader
	 * @see DocumentLoader#loadDocument
	 */
	protected Document doLoadDocument(InputSource inputSource, Resource resource) throws Exception {
		return this.documentLoader.loadDocument(inputSource, getEntityResolver(), this.errorHandler,
				getValidationModeForResource(resource), isNamespaceAware());
	}

	
Determine the validation mode for the specified Resource. If no explicit validation mode has been configured, then the validation mode gets detected from the given resource. 
Override this method if you would like full control over the validation mode, even when something other than VALIDATION_AUTO was set. 
See Also:
/**
	 * Determine the validation mode for the specified {@link Resource}.
	 * If no explicit validation mode has been configured, then the validation
	 * mode gets {@link #detectValidationMode detected} from the given resource.
	 * <p>Override this method if you would like full control over the validation
	 * mode, even when something other than {@link #VALIDATION_AUTO} was set.
	 * @see #detectValidationMode
	 */
	protected int getValidationModeForResource(Resource resource) {
		int validationModeToUse = getValidationMode();
		if (validationModeToUse != VALIDATION_AUTO) {
			return validationModeToUse;
		}
		int detectedMode = detectValidationMode(resource);
		if (detectedMode != VALIDATION_AUTO) {
			return detectedMode;
		}
		// Hmm, we didn't get a clear indication... Let's assume XSD,
		// since apparently no DTD declaration has been found up until
		// detection stopped (before finding the document's root tag).
		return VALIDATION_XSD;
	}

	
Detect which kind of validation to perform on the XML file identified by the supplied Resource. If the file has a DOCTYPE definition then DTD validation is used otherwise XSD validation is assumed. 
Override this method if you would like to customize resolution of the VALIDATION_AUTO mode. 
/**
	 * Detect which kind of validation to perform on the XML file identified
	 * by the supplied {@link Resource}. If the file has a {@code DOCTYPE}
	 * definition then DTD validation is used otherwise XSD validation is assumed.
	 * <p>Override this method if you would like to customize resolution
	 * of the {@link #VALIDATION_AUTO} mode.
	 */
	protected int detectValidationMode(Resource resource) {
		if (resource.isOpen()) {
			throw new BeanDefinitionStoreException(
					"Passed-in Resource [" + resource + "] contains an open stream: " +
					"cannot determine validation mode automatically. Either pass in a Resource " +
					"that is able to create fresh streams, or explicitly specify the validationMode " +
					"on your XmlBeanDefinitionReader instance.");
		}

		InputStream inputStream;
		try {
			inputStream = resource.getInputStream();
		}
		catch (IOException ex) {
			throw new BeanDefinitionStoreException(
					"Unable to determine validation mode for [" + resource + "]: cannot open InputStream. " +
					"Did you attempt to load directly from a SAX InputSource without specifying the " +
					"validationMode on your XmlBeanDefinitionReader instance?", ex);
		}

		try {
			return this.validationModeDetector.detectValidationMode(inputStream);
		}
		catch (IOException ex) {
			throw new BeanDefinitionStoreException("Unable to determine validation mode for [" +
					resource + "]: an error occurred whilst reading from the InputStream.", ex);
		}
	}

	
Register the bean definitions contained in the given DOM document. Called by loadBeanDefinitions. 
Creates a new instance of the parser class and invokes registerBeanDefinitions on it. 
Params:
  • doc – the DOM document
  • resource – the resource descriptor (for context information)
Throws:
See Also:
Returns:the number of bean definitions found
/**
	 * Register the bean definitions contained in the given DOM document.
	 * Called by {@code loadBeanDefinitions}.
	 * <p>Creates a new instance of the parser class and invokes
	 * {@code registerBeanDefinitions} on it.
	 * @param doc the DOM document
	 * @param resource the resource descriptor (for context information)
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of parsing errors
	 * @see #loadBeanDefinitions
	 * @see #setDocumentReaderClass
	 * @see BeanDefinitionDocumentReader#registerBeanDefinitions
	 */
	public int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException {
		BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
		int countBefore = getRegistry().getBeanDefinitionCount();
		documentReader.registerBeanDefinitions(doc, createReaderContext(resource));
		return getRegistry().getBeanDefinitionCount() - countBefore;
	}

	
Create the BeanDefinitionDocumentReader to use for actually reading bean definitions from an XML document. 
The default implementation instantiates the specified "documentReaderClass".

See Also:
/**
	 * Create the {@link BeanDefinitionDocumentReader} to use for actually
	 * reading bean definitions from an XML document.
	 * <p>The default implementation instantiates the specified "documentReaderClass".
	 * @see #setDocumentReaderClass
	 */
	protected BeanDefinitionDocumentReader createBeanDefinitionDocumentReader() {
		return BeanUtils.instantiateClass(this.documentReaderClass);
	}

	
Create the XmlReaderContext to pass over to the document reader. 
/**
	 * Create the {@link XmlReaderContext} to pass over to the document reader.
	 */
	public XmlReaderContext createReaderContext(Resource resource) {
		return new XmlReaderContext(resource, this.problemReporter, this.eventListener,
				this.sourceExtractor, this, getNamespaceHandlerResolver());
	}

	
Lazily create a default NamespaceHandlerResolver, if not set before.

See Also:
  • createDefaultNamespaceHandlerResolver()
/**
	 * Lazily create a default NamespaceHandlerResolver, if not set before.
	 * @see #createDefaultNamespaceHandlerResolver()
	 */
	public NamespaceHandlerResolver getNamespaceHandlerResolver() {
		if (this.namespaceHandlerResolver == null) {
			this.namespaceHandlerResolver = createDefaultNamespaceHandlerResolver();
		}
		return this.namespaceHandlerResolver;
	}

	
Create the default implementation of NamespaceHandlerResolver used if none is specified. 
The default implementation returns an instance of DefaultNamespaceHandlerResolver. 
See Also:
/**
	 * Create the default implementation of {@link NamespaceHandlerResolver} used if none is specified.
	 * <p>The default implementation returns an instance of {@link DefaultNamespaceHandlerResolver}.
	 * @see DefaultNamespaceHandlerResolver#DefaultNamespaceHandlerResolver(ClassLoader)
	 */
	protected NamespaceHandlerResolver createDefaultNamespaceHandlerResolver() {
		ClassLoader cl = (getResourceLoader() != null ? getResourceLoader().getClassLoader() : getBeanClassLoader());
		return new DefaultNamespaceHandlerResolver(cl);
	}

}