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Spring Framework example source code file (DelegatingEntityResolver.java)

This example Spring Framework source code file (DelegatingEntityResolver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

beansdtdresolver, delegatingentityresolver, delegatingentityresolver, dtd_suffix, entityresolver, entityresolver, inputsource, io, ioexception, pluggableschemaresolver, sax, saxexception, string, string, xsd_suffix, xsd_suffix

The Spring Framework DelegatingEntityResolver.java source code

/*
 * Copyright 2002-2007 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
 *
 *      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.springframework.beans.factory.xml;

import java.io.IOException;

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import org.springframework.util.Assert;

/**
 * {@link EntityResolver} implementation that delegates to a {@link BeansDtdResolver}
 * and a {@link PluggableSchemaResolver} for DTDs and XML schemas, respectively.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @author Rick Evans
 * @since 2.0
 * @see BeansDtdResolver
 * @see PluggableSchemaResolver
 */
public class DelegatingEntityResolver implements EntityResolver {

	/** Suffix for DTD files */
	public static final String DTD_SUFFIX = ".dtd";

	/** Suffix for schema definition files */
	public static final String XSD_SUFFIX = ".xsd";


	private final EntityResolver dtdResolver;

	private final EntityResolver schemaResolver;


	/**
	 * Create a new DelegatingEntityResolver that delegates to
	 * a default {@link BeansDtdResolver} and a default {@link PluggableSchemaResolver}.
	 * <p>Configures the {@link PluggableSchemaResolver} with the supplied
	 * {@link ClassLoader}.
	 * @param classLoader the ClassLoader to use for loading
	 * (can be <code>null) to use the default ClassLoader)
	 */
	public DelegatingEntityResolver(ClassLoader classLoader) {
		this.dtdResolver = new BeansDtdResolver();
		this.schemaResolver = new PluggableSchemaResolver(classLoader);
	}

	/**
	 * Create a new DelegatingEntityResolver that delegates to
	 * the given {@link EntityResolver EntityResolvers}.
	 * @param dtdResolver the EntityResolver to resolve DTDs with
	 * @param schemaResolver the EntityResolver to resolve XML schemas with
	 */
	public DelegatingEntityResolver(EntityResolver dtdResolver, EntityResolver schemaResolver) {
		Assert.notNull(dtdResolver, "'dtdResolver' is required");
		Assert.notNull(schemaResolver, "'schemaResolver' is required");
		this.dtdResolver = dtdResolver;
		this.schemaResolver = schemaResolver;
	}


	public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
		if (systemId != null) {
			if (systemId.endsWith(DTD_SUFFIX)) {
				return this.dtdResolver.resolveEntity(publicId, systemId);
			}
			else if (systemId.endsWith(XSD_SUFFIX)) {
				return this.schemaResolver.resolveEntity(publicId, systemId);
			}
		}
		return null;
	}

}

Other Spring Framework examples (source code examples)

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