net.jawr.web.resource.bundle.locale.ResourceBundleMessagesGenerator Maven / Gradle / Ivy

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Javascript/CSS bundling and compressing tool for java web apps. By using jawr resources are automatically bundled together and optionally minified and gzipped. Jawr provides tag libraries to reference a generated bundle either by id or by using the name of any of its members.

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/**
 * Copyright 2008 Jordi Hern?ndez Sell?s
 * 
 * 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 net.jawr.web.resource.bundle.locale;

import java.io.Reader;

import net.jawr.web.resource.bundle.factory.util.ClassLoaderResourceUtils;
import net.jawr.web.resource.bundle.generator.AbstractJavascriptGenerator;
import net.jawr.web.resource.bundle.generator.GeneratorContext;
import net.jawr.web.resource.bundle.generator.GeneratorRegistry;
import net.jawr.web.resource.bundle.generator.ResourceGenerator;
import net.jawr.web.resource.bundle.locale.message.MessageBundleScriptCreator;

import org.apache.log4j.Logger;

/**
 * A generator that creates a script from message bundles.
 * The generated script can be used to reference the message literals easily from javascript.  
 * 
 * @author Jordi Hern?ndez Sell?s
 *
 */
public class ResourceBundleMessagesGenerator extends AbstractJavascriptGenerator implements ResourceGenerator {
	public static final String GRAILS_WAR_DEPLOYED = "jawr.grails.war.deployed";
	private static final String GRAILS_MESSAGE_CREATOR = "net.jawr.web.resource.bundle.locale.message.GrailsMessageBundleScriptCreator";
	private static final Logger log = Logger.getLogger(ResourceBundleMessagesGenerator.class);
	
	/* (non-Javadoc)
	 * @see net.jawr.web.resource.bundle.generator.ResourceGenerator#createResource(java.lang.String, java.nio.charset.Charset)
	 */
	public Reader createResource(GeneratorContext context) {
		MessageBundleScriptCreator creator = null;
		// In grails apps, the generator uses a special implementation
		if(null == context.getServletContext().getAttribute(ResourceBundleMessagesGenerator.GRAILS_WAR_DEPLOYED)){
			if(log.isDebugEnabled())
				log.debug("Using standard messages generator. ");
			creator = new MessageBundleScriptCreator(context);
		}
		else {
			if(log.isDebugEnabled())
				log.debug("Using grails messages generator. ");
			// Loading this way prevents unwanted dependencies in non grails applications. 
			Object[] param = {context};
			creator = (MessageBundleScriptCreator) ClassLoaderResourceUtils.buildObjectInstance(GRAILS_MESSAGE_CREATOR,param);
		}
		return creator.createScript(context.getCharset());
	}

	/* (non-Javadoc)
	 * @see net.jawr.web.resource.bundle.generator.ResourceGenerator#getMappingPrefix()
	 */
	public String getMappingPrefix() {
		return GeneratorRegistry.MESSAGE_BUNDLE_PREFIX;
	}
}