Source Code Cross Referenced for PluggableSchemaResolver.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.IOException;
020:        import java.util.Properties;
021:
022:        import org.apache.commons.logging.Log;
023:        import org.apache.commons.logging.LogFactory;
024:        import org.xml.sax.EntityResolver;
025:        import org.xml.sax.InputSource;
026:
027:        import org.springframework.beans.FatalBeanException;
028:        import org.springframework.core.io.ClassPathResource;
029:        import org.springframework.core.io.Resource;
030:        import org.springframework.core.io.support.PropertiesLoaderUtils;
031:        import org.springframework.util.Assert;
032:
033:        /**
034:         * {@link EntityResolver} implementation that attempts to resolve schema URLs into
035:         * local {@link ClassPathResource classpath resources} using a set of mappings files.
036:         *
037:         * <p>By default, this class will look for mapping files in the classpath using the pattern:
038:         * <code>META-INF/spring.schemas</code> allowing for multiple files to exist on the
039:         * classpath at any one time.
040:         *
041:         * The format of <code>META-INF/spring.schemas</code> is a properties
042:         * file where each line should be of the form <code>systemId=schema-location</code>
043:         * where <code>schema-location</code> should also be a schema file in the classpath.
044:         * Since systemId is commonly a URL, one must be careful to escape any ':' characters
045:         * which are treated as delimiters in properties files.
046:         *
047:         * <p>The pattern for the mapping files can be overidden using the
048:         * {@link #PluggableSchemaResolver(ClassLoader, String)} constructor
049:         *
050:         * @author Rob Harrop
051:         * @author Juergen Hoeller
052:         * @since 2.0
053:         */
054:        public class PluggableSchemaResolver implements  EntityResolver {
055:
056:            /**
057:             * The location of the file that defines schema mappings.
058:             * Can be present in multiple JAR files.
059:             */
060:            public static final String DEFAULT_SCHEMA_MAPPINGS_LOCATION = "META-INF/spring.schemas";
061:
062:            private static final Log logger = LogFactory
063:                    .getLog(PluggableSchemaResolver.class);
064:
065:            private final ClassLoader classLoader;
066:
067:            /** Stores the mapping of schema URL -> local schema path */
068:            private final Properties schemaMappings;
069:
070:            /**
071:             * Loads the schema URL -> schema file location mappings using the default
072:             * mapping file pattern "META-INF/spring.schemas".
073:             * @param classLoader the ClassLoader to use for loading
074:             * (can be <code>null</code>) to use the default ClassLoader)
075:             * @see PropertiesLoaderUtils#loadAllProperties(String, ClassLoader)
076:             */
077:            public PluggableSchemaResolver(ClassLoader classLoader) {
078:                this (classLoader, DEFAULT_SCHEMA_MAPPINGS_LOCATION);
079:            }
080:
081:            /**
082:             * Loads the schema URL -> schema file location mappings using the given
083:             * mapping file pattern.
084:             * @param classLoader the ClassLoader to use for loading
085:             * (can be <code>null</code>) to use the default ClassLoader)
086:             * @param schemaMappingsLocation the location of the file that defines schema mappings
087:             * (must not be empty)
088:             * @see PropertiesLoaderUtils#loadAllProperties(String, ClassLoader)
089:             */
090:            public PluggableSchemaResolver(ClassLoader classLoader,
091:                    String schemaMappingsLocation) {
092:                Assert.hasText(schemaMappingsLocation,
093:                        "'schemaMappingsLocation' must not be empty");
094:                this .classLoader = classLoader;
095:                if (logger.isDebugEnabled()) {
096:                    logger.debug("Loading schema mappings from ["
097:                            + schemaMappingsLocation + "]");
098:                }
099:                try {
100:                    this .schemaMappings = PropertiesLoaderUtils
101:                            .loadAllProperties(schemaMappingsLocation,
102:                                    classLoader);
103:                    if (logger.isDebugEnabled()) {
104:                        logger.debug("Loaded schema mappings: "
105:                                + this .schemaMappings);
106:                    }
107:                } catch (IOException e) {
108:                    throw new FatalBeanException(
109:                            "Unable to load schema mappings from location ["
110:                                    + schemaMappingsLocation + "]", e);
111:                }
112:            }
113:
114:            public InputSource resolveEntity(String publicId, String systemId)
115:                    throws IOException {
116:                if (logger.isTraceEnabled()) {
117:                    logger
118:                            .trace("Trying to resolve XML entity with public id ["
119:                                    + publicId
120:                                    + "] and system id ["
121:                                    + systemId
122:                                    + "]");
123:                }
124:                if (systemId != null) {
125:                    String resourceLocation = this .schemaMappings
126:                            .getProperty(systemId);
127:                    if (resourceLocation != null) {
128:                        Resource resource = new ClassPathResource(
129:                                resourceLocation, this .classLoader);
130:                        InputSource source = new InputSource(resource
131:                                .getInputStream());
132:                        source.setPublicId(publicId);
133:                        source.setSystemId(systemId);
134:                        if (logger.isDebugEnabled()) {
135:                            logger.debug("Found XML schema [" + systemId
136:                                    + "] in classpath: " + resourceLocation);
137:                        }
138:                        return source;
139:                    }
140:                }
141:                return null;
142:            }
143:
144:        }
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