Struts example source code file (BundleFreemarkerManager.java)

This example Struts source code file (BundleFreemarkerManager.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 - Struts tags/keywords

bundlefreemarkermanager, file, freemarkerbundleresourceloader, freemarkerbundleresourceloader, freemarkermanager, invalid, io, log, multitemplateloader, multitemplateloader, servlet, strutsclasstemplateloader, templateloader, templateloader, webapptemplateloader, webapptemplateloader

The Struts BundleFreemarkerManager.java source code

/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts2.osgi;

import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.FileTemplateLoader;
import freemarker.cache.MultiTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.cache.WebappTemplateLoader;
import org.apache.struts2.osgi.loaders.FreeMarkerBundleResourceLoader;
import org.apache.struts2.views.freemarker.FreemarkerManager;
import org.apache.struts2.views.freemarker.StrutsClassTemplateLoader;

import javax.servlet.ServletContext;
import java.io.File;
import java.io.IOException;

/**
 * This class extends FreemarkerManager in core to add a template loader
 * (that finds resources inside bundles) to MultiTemplateLoader
 */
public class BundleFreemarkerManager extends FreemarkerManager {

    private static final Logger LOG = LoggerFactory.getLogger(BundleFreemarkerManager.class);

    protected TemplateLoader createTemplateLoader(ServletContext servletContext, String templatePath) {
        TemplateLoader templatePathLoader = null;

        try {
             if (templatePath.startsWith("class://")) {
                 // substring(7) is intentional as we "reuse" the last slash
                 templatePathLoader = new ClassTemplateLoader(getClass(), templatePath.substring(7));
             } else if (templatePath.startsWith("file://")) {
                 templatePathLoader = new FileTemplateLoader(new File(templatePath));
             }
         } catch (IOException e) {
             LOG.error("Invalid template path specified: " + e.getMessage(), e);
         }

        // presume that most apps will require the class and webapp template loader
        // if people wish to
        return templatePathLoader != null ?
                new MultiTemplateLoader(new TemplateLoader[]{
                        templatePathLoader,
                        new WebappTemplateLoader(servletContext),
                        new StrutsClassTemplateLoader(),
                        new FreeMarkerBundleResourceLoader()
                })
                : new MultiTemplateLoader(new TemplateLoader[]{
                new WebappTemplateLoader(servletContext),
                new StrutsClassTemplateLoader(),
                new FreeMarkerBundleResourceLoader()
        });
    }

}