Source Code Cross Referenced for ResourceEntityResolver.java in  » J2EE » spring-framework-2.0.6 » org » springframework » beans » factory » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.beans.factory.xml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.beans.factory.xml;
018:
019:        import java.io.File;
020:        import java.io.IOException;
021:        import java.net.URL;
022:        import java.net.URLDecoder;
023:
024:        import org.apache.commons.logging.Log;
025:        import org.apache.commons.logging.LogFactory;
026:        import org.xml.sax.InputSource;
027:        import org.xml.sax.SAXException;
028:
029:        import org.springframework.core.io.Resource;
030:        import org.springframework.core.io.ResourceLoader;
031:
032:        /**
033:         * EntityResolver implementation that tries to resolve entity references
034:         * through a {@link org.springframework.core.io.ResourceLoader} (usually,
035:         * relative to the resource base of an ApplicationContext), if applicable.
036:         * Extends {@link DelegatingEntityResolver} to also provide DTD and XSD lookup.
037:         *
038:         * <p>Allows to use standard XML entities to include XML snippets into an
039:         * application context definition, for example to split a large XML file
040:         * into various modules. The include paths can be relative to the
041:         * application context's resource base as usual, instead of relative
042:         * to the JVM working directory (the XML parser's default).
043:         *
044:         * <p>Note: In addition to relative paths, every URL that specifies a
045:         * file in the current system root, i.e. the JVM working directory,
046:         * will be interpreted relative to the application context too.
047:         *
048:         * @author Juergen Hoeller
049:         * @since 31.07.2003
050:         * @see org.springframework.core.io.ResourceLoader
051:         * @see org.springframework.context.ApplicationContext
052:         */
053:        public class ResourceEntityResolver extends DelegatingEntityResolver {
054:
055:            private static final Log logger = LogFactory
056:                    .getLog(ResourceEntityResolver.class);
057:
058:            private final ResourceLoader resourceLoader;
059:
060:            /**
061:             * Create a ResourceEntityResolver for the specified ResourceLoader
062:             * (usually, an ApplicationContext).
063:             * @param resourceLoader the ResourceLoader (or ApplicationContext)
064:             * to load XML entity includes with
065:             */
066:            public ResourceEntityResolver(ResourceLoader resourceLoader) {
067:                super (resourceLoader.getClassLoader());
068:                this .resourceLoader = resourceLoader;
069:            }
070:
071:            public InputSource resolveEntity(String publicId, String systemId)
072:                    throws SAXException, IOException {
073:                InputSource source = super .resolveEntity(publicId, systemId);
074:                if (source == null && systemId != null) {
075:                    String resourcePath = null;
076:                    try {
077:                        String decodedSystemId = URLDecoder.decode(systemId);
078:                        String givenUrl = new URL(decodedSystemId).toString();
079:                        String systemRootUrl = new File("").toURL().toString();
080:                        // Try relative to resource base if currently in system root.
081:                        if (givenUrl.startsWith(systemRootUrl)) {
082:                            resourcePath = givenUrl.substring(systemRootUrl
083:                                    .length());
084:                        }
085:                    } catch (Exception ex) {
086:                        // Typically a MalformedURLException or AccessControlException.
087:                        if (logger.isDebugEnabled()) {
088:                            logger.debug("Could not resolve XML entity ["
089:                                    + systemId + "] against system root URL",
090:                                    ex);
091:                        }
092:                        // No URL (or no resolvable URL) -> try relative to resource base.
093:                        resourcePath = systemId;
094:                    }
095:                    if (resourcePath != null) {
096:                        if (logger.isTraceEnabled()) {
097:                            logger.trace("Trying to locate XML entity ["
098:                                    + systemId + "] as resource ["
099:                                    + resourcePath + "]");
100:                        }
101:                        Resource resource = this .resourceLoader
102:                                .getResource(resourcePath);
103:                        source = new InputSource(resource.getInputStream());
104:                        source.setPublicId(publicId);
105:                        source.setSystemId(systemId);
106:                        if (logger.isDebugEnabled()) {
107:                            logger.debug("Found XML entity [" + systemId
108:                                    + "]: " + resource);
109:                        }
110:                    }
111:                }
112:                return source;
113:            }
114:
115:        }
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