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Apache CXF example source code file (ClassLoaderSwitcher.java)

This example Apache CXF source code file (ClassLoaderSwitcher.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 - Apache CXF tags/keywords

arraylist, classloader, classloaderswitcher, hashmap, io, list, malformedurlexception, map, map, net, network, object, object, string, string, stringbuilder, stringbuilder, util

The Apache CXF ClassLoaderSwitcher.java source code

/**
 * 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.cxf.maven_plugin;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.cxf.helpers.CastUtils;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;

/**
 * Manages switching to the classloader needed for creating the java sources and restoring the old classloader
 * when finished
 */
public class ClassLoaderSwitcher {

    private Log log;
    private String origClassPath;
    private Map<Object, Object> origProps;
    private ClassLoader origContextClassloader;

    public ClassLoaderSwitcher(Log log) {
        this.log = log;
    }

    /**
     * Create and set the classloader that is needed for creating the java sources from wsdl
     * 
     * @param project
     * @param useCompileClasspath
     * @param classesDir
     */
    public void switchClassLoader(MavenProject project, boolean useCompileClasspath, File classesDir) {
        List<URL> urlList = new ArrayList();
        StringBuilder buf = new StringBuilder();

        try {
            urlList.add(classesDir.toURI().toURL());
            if (!useCompileClasspath) {
                urlList.add(new File(project.getBuild().getOutputDirectory()).toURI().toURL());
            }
        } catch (MalformedURLException e) {
            // ignore
        }

        buf.append(classesDir.getAbsolutePath());
        buf.append(File.pathSeparatorChar);
        if (!useCompileClasspath) {
            buf.append(project.getBuild().getOutputDirectory());
            buf.append(File.pathSeparatorChar);
        }
        List<?> artifacts = useCompileClasspath ? project.getCompileArtifacts() : project.getTestArtifacts();
        for (Artifact a : CastUtils.cast(artifacts, Artifact.class)) {
            try {
                if (a.getFile() != null && a.getFile().exists()) {
                    urlList.add(a.getFile().toURI().toURL());
                    buf.append(a.getFile().getAbsolutePath());
                    buf.append(File.pathSeparatorChar);
                    // System.out.println("     " +
                    // a.getFile().getAbsolutePath());
                }
            } catch (MalformedURLException e) {
                // ignore
            }
        }

        origContextClassloader = Thread.currentThread().getContextClassLoader();
        URLClassLoader loader = new URLClassLoader(urlList.toArray(new URL[urlList.size()]),
                                                   origContextClassloader);
        String newCp = buf.toString();

        log.debug("Classpath: " + urlList.toString());

        origProps = new HashMap<Object, Object>(System.getProperties());

        origClassPath = System.getProperty("java.class.path");

        Thread.currentThread().setContextClassLoader(loader);
        System.setProperty("java.class.path", newCp);
    }

    /**
     * Restore the old classloader
     */
    public void restoreClassLoader() {
        Thread.currentThread().setContextClassLoader(origContextClassloader);
        System.setProperty("java.class.path", origClassPath);

        Map<Object, Object> newProps = new HashMap(System.getProperties());
        for (Object o : newProps.keySet()) {
            if (!origProps.containsKey(o)) {
                System.clearProperty(o.toString());
            }
        }
        System.getProperties().putAll(origProps);
    }
}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF ClassLoaderSwitcher.java source code file:

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