/*

 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.internal.ws;

import com.sun.istack.internal.tools.MaskingClassLoader;

import com.sun.istack.internal.tools.ParallelWorldClassLoader;

import com.sun.tools.internal.ws.resources.WscompileMessages;

import com.sun.tools.internal.xjc.api.util.ToolsJarNotFoundException;

import com.sun.xml.internal.bind.util.Which;

import javax.xml.ws.Service;

import javax.xml.ws.WebServiceFeature;

import java.io.File;

import java.io.OutputStream;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

/**

 * Invokes JAX-WS tools in a special class loader that can pick up APT classes,

 * even if it's not available in the tool launcher classpath.

 *

 * @author Kohsuke Kawaguchi

 */

public final class Invoker {

    static int invoke(String mainClass, String[] args) throws Throwable {

        // use the platform default proxy if available.

        // see sun.net.spi.DefaultProxySelector for details.

        if(!noSystemProxies) {

            try {

                System.setProperty("java.net.useSystemProxies","true");

            } catch (SecurityException e) {

                // failing to set this property isn't fatal

            }

        }

        ClassLoader oldcc = Thread.currentThread().getContextClassLoader();

        try {

            ClassLoader cl = Invoker.class.getClassLoader();

            if(Arrays.asList(args).contains("-Xendorsed"))

                cl = createClassLoader(cl); // perform JDK6 workaround hack

            else {

                if(!checkIfLoading21API()) {

                    if(Service.class.getClassLoader()==null)

                        System.err.println(WscompileMessages.INVOKER_NEED_ENDORSED());

                    else

                        System.err.println(WscompileMessages.WRAPPER_TASK_LOADING_20_API(Which.which(Service.class)));

                    return -1;

                }

                //find and load tools.jar

                List<URL> urls = new ArrayList<URL>();

                findToolsJar(cl, urls);

                if(urls.size() > 0){

                    List<String> mask = new ArrayList<String>(Arrays.asList(maskedPackages));

                    // first create a protected area so that we load JAXB/WS 2.1 API

                    // and everything that depends on them inside

                    cl = new MaskingClassLoader(cl,mask);

                    // then this classloader loads the API and tools.jar

                    cl = new URLClassLoader(urls.toArray(new URL[urls.size()]), cl);

                    // finally load the rest of the RI. The actual class files are loaded from ancestors

                    cl = new ParallelWorldClassLoader(cl,"");

                }

            }

            Thread.currentThread().setContextClassLoader(cl);

            Class compileTool = cl.loadClass(mainClass);

            Constructor ctor = compileTool.getConstructor(OutputStream.class);

            Object tool = ctor.newInstance(System.out);

            Method runMethod = compileTool.getMethod("run",String[].class);

            boolean r = (Boolean)runMethod.invoke(tool,new Object[]{args});

            return r ? 0 : 1;

        } catch (ToolsJarNotFoundException e) {

            System.err.println(e.getMessage());

        } catch (InvocationTargetException e) {

            throw e.getCause();

        } catch(ClassNotFoundException e){

            throw e;

        }finally {

            Thread.currentThread().setContextClassLoader(oldcc);

        }

        return -1;

    }

    /**

     * Returns true if the RI appears to be loading the JAX-WS 2.1 API.

     */

    public static boolean checkIfLoading21API() {

        try {

            Service.class.getMethod("getPort",Class.class, WebServiceFeature[].class);

            // yup. things look good.

            return true;

        } catch (NoSuchMethodException e) {

        } catch (LinkageError e) {

        }

        // nope

        return false;

    }

    /**

     * Creates a classloader that can load JAXB/WS 2.1 API and tools.jar,

     * and then return a classloader that can RI classes, which can see all those APIs and tools.jar.

     */

    public static ClassLoader createClassLoader(ClassLoader cl) throws ClassNotFoundException, MalformedURLException, ToolsJarNotFoundException {

        URL[] urls = findIstackAPIs(cl);

        if(urls.length==0)

            return cl;  // we seem to be able to load everything already. no need for the hack

        List<String> mask = new ArrayList<String>(Arrays.asList(maskedPackages));

        if(urls.length>1) {

            // we need to load 2.1 API from side. so add them to the mask

            mask.add("javax.xml.bind.");

            mask.add("javax.xml.ws.");

        }

        // first create a protected area so that we load JAXB/WS 2.1 API

        // and everything that depends on them inside

        cl = new MaskingClassLoader(cl,mask);

        // then this classloader loads the API and tools.jar

        cl = new URLClassLoader(urls, cl);

        // finally load the rest of the RI. The actual class files are loaded from ancestors

        cl = new ParallelWorldClassLoader(cl,"");

        return cl;

    }

    /**

     * Creates a classloader for loading JAXB/WS 2.1 jar and tools.jar

     */

    private static URL[] findIstackAPIs(ClassLoader cl) throws ClassNotFoundException, MalformedURLException, ToolsJarNotFoundException {

        List<URL> urls = new ArrayList<URL>();

        if(Service.class.getClassLoader()==null) {

            // JAX-WS API is loaded from bootstrap classloader

            URL res = cl.getResource("javax/xml/ws/EndpointReference.class");

            if(res==null)

                throw new ClassNotFoundException("There's no JAX-WS 2.1 API in the classpath");

            urls.add(ParallelWorldClassLoader.toJarUrl(res));

            res = cl.getResource("javax/xml/bind/annotation/XmlSeeAlso.class");

            if(res==null)

                throw new ClassNotFoundException("There's no JAXB 2.1 API in the classpath");

            urls.add(ParallelWorldClassLoader.toJarUrl(res));

        }

        findToolsJar(cl, urls);

        return urls.toArray(new URL[urls.size()]);

    }

    private static void findToolsJar(ClassLoader cl, List<URL> urls) throws ToolsJarNotFoundException, MalformedURLException {

        try {

            Class.forName("com.sun.tools.javac.Main",false,cl);

            Class.forName("com.sun.tools.apt.Main",false,cl);

            // we can already load them in the parent class loader.

            // so no need to look for tools.jar.

            // this happens when we are run inside IDE/Ant, or

            // in Mac OS.

        } catch (ClassNotFoundException e) {

            // otherwise try to find tools.jar

            File jreHome = new File(System.getProperty("java.home"));

            File toolsJar = new File( jreHome.getParent(), "lib/tools.jar" );

            if (!toolsJar.exists()) {

                throw new ToolsJarNotFoundException(toolsJar);

            }

            urls.add(toolsJar.toURL());

        }

    }

    /**

     * The list of package prefixes we want the

     * {@link MaskingClassLoader} to prevent the parent

     * classLoader from loading

     */

    public static String[] maskedPackages = new String[]{

        "com.sun.istack.internal.tools.",

        "com.sun.tools.internal.jxc.",

        "com.sun.tools.internal.xjc.",

        "com.sun.tools.internal.ws.",

        "com.sun.codemodel.internal.",

        "com.sun.relaxng.",

        "com.sun.xml.internal.xsom.",

        "com.sun.xml.internal.bind.",

        "com.sun.xml.internal.ws."

    };

    /**

     * Escape hatch to work around IBM JDK problem.

     * See http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?nav=false&forum=367&thread=164718&cat=10

     */

    public static boolean noSystemProxies = false;

    static {

        try {

            noSystemProxies = Boolean.getBoolean(Invoker.class.getName()+".noSystemProxies");

        } catch(SecurityException e) {

            // ignore

        }

    }

}