Struts example source code file (OsgiUtil.java)

This example Struts source code file (OsgiUtil.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

boolean, exception, exception, log, malformedurlexception, method, net, network, object, osgiutil, reflection, string, string, stringbuilder, stringbuilder, unable, unable

The Struts OsgiUtil.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 java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.MalformedURLException;

import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.Bundle;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

public class OsgiUtil {
    private static final Logger LOG = LoggerFactory.getLogger(OsgiUtil.class);

    /**
     * A bundle is a jar, and a bunble URL will be useless to clients, this method translates
     * a URL to a resource inside a bundle from "bundle:something/path" to "jar:file:bundlelocation!/path"
     */
    public static URL translateBundleURLToJarURL(URL bundleUrl, Bundle bundle) throws MalformedURLException {
        if (bundleUrl != null && "bundle".equalsIgnoreCase(bundleUrl.getProtocol())) {
            StringBuilder sb = new StringBuilder("jar:");
            sb.append(bundle.getLocation());
            sb.append("!");
            sb.append(bundleUrl.getFile());
            return new URL(sb.toString());
        }

        return bundleUrl;
    }

    /**
     * Calls getBean() on the passed object using refelection. Used on Spring context
     * because they are loaded from bundles (in anothe class loader)
     */
    public static Object getBean(Object beanFactory, String beanId) {
        try {
            Method getBeanMethod = beanFactory.getClass().getMethod("getBean", String.class);
            return getBeanMethod.invoke(beanFactory, beanId);
        } catch (Exception ex) {
            if (LOG.isErrorEnabled())
                LOG.error("Unable to call getBean() on object of type [#0], with bean id [#1]", ex, beanFactory.getClass().getName(), beanId);
        }

        return null;
    }

    /**
     * Calls containsBean on the passed object using refelection. Used on Spring context
     * because they are loaded from bundles (in anothe class loader)
     */
    public static boolean containsBean(Object beanFactory, String beanId) {
        try {
            Method getBeanMethod = beanFactory.getClass().getMethod("containsBean", String.class);
            return (Boolean) getBeanMethod.invoke(beanFactory, beanId);
        } catch (Exception ex) {
            if (LOG.isErrorEnabled())
                LOG.error("Unable to call containsBean() on object of type [#0], with bean id [#1]", ex, beanFactory.getClass().getName(), beanId);
        }

        return false;
    }
}