/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
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 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
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 * Contributor(s):
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
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 * If you wish your version of this file to be governed by only the CDDL
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 * under the [CDDL or GPL Version 2] license." If you do not indicate a
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 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
 * made subject to such option by the copyright holder.
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package org.netbeans.modules.debugger.jpda.ant;

import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.beans.PropertyChangeEvent;

import com.sun.jdi.Bootstrap;
import com.sun.jdi.connect.ListeningConnector;
import com.sun.jdi.connect.Transport;
import com.sun.jdi.connect.Connector;
import java.beans.PropertyChangeListener;

import java.lang.ref.WeakReference;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map.Entry;
import java.util.logging.Level;
import java.util.logging.Logger;

import java.util.regex.Pattern;
import org.apache.tools.ant.BuildEvent;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.BuildListener;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Path;
import org.netbeans.api.debugger.Breakpoint;
import org.netbeans.api.debugger.jpda.DebuggerStartException;

import org.openide.ErrorManager;
import org.openide.filesystems.FileStateInvalidException;
import org.openide.util.RequestProcessor;
import org.openide.filesystems.FileObject;
import org.openide.filesystems.FileUtil;

import org.netbeans.api.java.classpath.ClassPath;
import org.netbeans.api.java.queries.SourceForBinaryQuery;
import org.netbeans.api.debugger.DebuggerManager;
import org.netbeans.api.debugger.jpda.JPDADebugger;
import org.netbeans.spi.java.classpath.support.ClassPathSupport;
import org.netbeans.api.debugger.DebuggerEngine;
import org.netbeans.api.debugger.DebuggerManagerAdapter;
import org.netbeans.api.debugger.Session;
import org.netbeans.api.debugger.jpda.ExceptionBreakpoint;
import org.netbeans.api.debugger.jpda.JPDAClassType;
import org.netbeans.api.debugger.jpda.JPDAThread;
import org.netbeans.api.debugger.jpda.MethodBreakpoint;
import org.netbeans.api.debugger.jpda.ObjectVariable;
import org.netbeans.api.debugger.jpda.Variable;
import org.netbeans.api.debugger.jpda.event.JPDABreakpointEvent;
import org.netbeans.api.debugger.jpda.event.JPDABreakpointListener;
import org.netbeans.api.java.platform.JavaPlatform;
import org.netbeans.api.java.source.BuildArtifactMapper;
import org.netbeans.api.java.source.BuildArtifactMapper.ArtifactsUpdated;
import org.openide.util.Lookup;
import org.openide.util.NbBundle;
import org.openide.util.WeakListeners;


/**
 * Ant task to start the NetBeans JPDA debugger in listening mode.
 *
 * @author Jesse Glick, David Konecny
 */
public class JPDAStart extends Task implements Runnable {

    private static final Logger logger = Logger.getLogger("org.netbeans.modules.debugger.jpda.ant"); // NOI18N

    private static final String SOCKET_TRANSPORT = "dt_socket"; // NOI18N
    private static final String SHMEM_TRANSPORT = "dt_shmem"; // NOI18N
    private static final String SOCKET_CONNECTOR = "com.sun.jdi.SocketListen"; // NOI18N
    private static final String SHMEM_CONNECTOR = "com.sun.jdi.SharedMemoryListen"; // NOI18N

    /** Name of the property to which the JPDA address will be set.
     * Target VM should use this address and connect to it
     */
    private String                  addressProperty;
    /** Default transport is socket*/
    private String                  transport = SOCKET_TRANSPORT;
    /** Preferred connector name. May be null. */
    private String                  connector;
    /** Name which will represent this debugging session in debugger UI.
     * If known in advance it should be name of the app which will be debugged.
     */
    private String                  name;
    /** Explicit sourcepath of the debugged process. */
    private Sourcepath              sourcepath = null;
    private Path                    plainSourcepath = null;
    private boolean                 isSourcePathExclusive;
    /** Explicit classpath of the debugged process. */
    private Path                    classpath = null;
    /** Explicit bootclasspath of the debugged process. */
    private Path                    bootclasspath = null;
    private final Object []         lock = new Object[2];
    /** The class debugger should stop in, or null. */
    private String                  stopClassName = null;
    private String                  listeningCP = null;
    private RequestProcessor        rp = new RequestProcessor("JPDAStart", 1);

    
    // properties ..............................................................

    public void setAddressProperty (String propertyName) {
        this.addressProperty = propertyName;
    }

    private String getAddressProperty () {
        return addressProperty;
    }

    public void setTransport (String transport) {
        logger.fine("Set transport: '"+transport+"'");
        this.transport = transport;
    }

    private String getTransport () {
        return transport;
    }
    
    public void setConnector(String connector) {
        this.connector = connector;
    }

    public String getConnector() {
        return connector;
    }

    public void setName (String name) {
        this.name = name;
    }

    private String getName () {
        return name;
    }

    public void setStopClassName (String stopClassName) {
        this.stopClassName = stopClassName;
    }

    private String getStopClassName () {
        return stopClassName;
    }

    public void setListeningcp(String listeningCP) {
        this.listeningCP = listeningCP;
    }

    public void addClasspath (Path path) {
        logger.fine("addClasspath("+path+")");
        if (classpath != null)
            throw new BuildException ("Only one classpath subelement is supported");
        classpath = path;
    }

    public void addBootclasspath (Path path) {
        logger.fine("addBootclasspath("+path+")");
        if (bootclasspath != null)
            throw new BuildException ("Only one bootclasspath subelement is supported");
        bootclasspath = path;
    }

    public void addSourcepath (Sourcepath path) {
        logger.fine("addSourcepath("+path+")");
        if (sourcepath != null)
            throw new BuildException ("Only one sourcepath subelement is supported");
        sourcepath = path;
    }

    static void verifyPaths(Project project, Path path) {
        if (path == null) return ;
        String[] paths = path.list();
        for (int i = 0; i < paths.length; i++) {
            String pathName = project.replaceProperties(paths[i]);
            File file = FileUtil.normalizeFile
                (project.resolveFile (pathName));
            if (!file.exists()) {
                project.log("Non-existing path \""+pathName+"\" provided.", Project.MSG_WARN);
                //throw new BuildException("Non-existing path \""+paths[i]+"\" provided.");
            }
        }
    }

    /** Searching for a connector in given collection.
     * @param name - name of the connector
     * @param connectors
     * @return the connector or null
     */
    private static ListeningConnector findConnector(String name, final Collection<ListeningConnector> connectors) {
        assert name != null;
        for (ListeningConnector c : connectors) {
            if (name.equals(c.name())) {
                return c;
            }
        }
        return null;
    }
    
    // main methods ............................................................

    @Override
    public void execute () throws BuildException {
        verifyPaths(getProject(), classpath);
        //verifyPaths(getProject(), bootclasspath); Do not check the paths on bootclasspath (see issue #70930).
        if (sourcepath != null) {
            isSourcePathExclusive = sourcepath.isExclusive();
            plainSourcepath = sourcepath.getPlainPath();
        }
        verifyPaths(getProject(), plainSourcepath);
        try {
            logger.fine("JPDAStart.execute()"); // NOI18N
            debug ("Execute started"); // NOI18N
            if (name == null)
                throw new BuildException ("name attribute must specify name of this debugging session", getLocation ());
            if (addressProperty == null)
                throw new BuildException ("addressproperty attribute must specify name of property to which address will be set", getLocation ());
            if (transport == null)
                transport = SOCKET_TRANSPORT;
            debug ("Entering synch lock"); // NOI18N
            lock[0] = lock[1] = null;
            synchronized (lock) {
                debug ("Entered synch lock"); // NOI18N
                rp.post (this);
                try {
                    debug ("Entering wait"); // NOI18N
                    lock.wait ();
                    debug ("Wait finished"); // NOI18N
                    if (lock [1] != null) {
                        if (lock[1] instanceof DebuggerStartException) {
                            //getProject().log(((DebuggerStartException) lock[1]).getLocalizedMessage(), Project.MSG_ERR);
                            throw new BuildException(((DebuggerStartException) lock[1]).getLocalizedMessage());
                        } else if (lock[1] instanceof ThreadDeath) {
                            throw (ThreadDeath) lock[1];
                        } else {
                            throw new BuildException ((Throwable) lock [1]);
                        }
                    }
                } catch (InterruptedException e) {
                    throw new BuildException (e);
                }
            }
        } catch (Throwable t) {
            t.printStackTrace ();
            throw new BuildException (t);
        }
    }

    public void run () {
        logger.fine("JPDAStart.run()"); // NOI18N
        debug ("Entering synch lock"); // NOI18N
        synchronized (lock) {
            debug("Entered synch lock"); // NOI18N
            try {
                ListeningConnector lc = null;
                final Set<ListeningConnector> connectors = new HashSet<ListeningConnector>();
                // search for connectors registered by NetBeans modules
                // In JavaFX listening connectors are registered as Connector.class.
                final Lookup.Result<Connector> r = Lookup.getDefault().lookupResult(Connector.class);
                for(Connector c: r.allInstances()) {
                    if (c instanceof ListeningConnector) connectors.add((ListeningConnector) c);
                }
                // use JDI default as well
                connectors.addAll(Bootstrap.virtualMachineManager().listeningConnectors());

                // if name of the connector has been specified, try to use it
                if (connector != null) {
                    logger.log(Level.FINE, "Looking for connector {0}", connector);
                    lc = findConnector(connector, connectors);
                }
                if (lc == null) {
                    // if dt_socket then use default socket as specified by JDI
                    if (transport.equals(SOCKET_TRANSPORT)) {
                        logger.log(Level.FINE, "Looking for default connector {0}", SOCKET_CONNECTOR);
                        lc = findConnector(SOCKET_CONNECTOR, connectors);
                    // if dt_shmem then use the default socket as specified by JDI
                    } else if (transport.equals(SHMEM_TRANSPORT)) {
                        logger.log(Level.FINE, "Looking for default connector {0}", SHMEM_CONNECTOR);
                        lc = findConnector(SHMEM_CONNECTOR, connectors);
                    }
                }
                // fallback to the original, i.e. find first connector whose transport
                // name matches given transport
                if (lc == null) {
                    logger.log(Level.FINE, "Fall back, looking for a connector with transport {0}", transport);
                    for (ListeningConnector c: connectors) {
                        Transport t = c.transport ();
                        if (t != null && t.name ().equals (transport)) {
                            lc = c;
                            break;
                        }
                    }
                }
                if (lc == null)
                    throw new BuildException
                        ("No transports named " + transport + " found!");

                logger.log(Level.FINE, "Listening using connector {0}, transport {1}", new Object[] {lc.name(), lc.transport().name()});

                final Map args = lc.defaultArguments ();
                Connector.StringArgument localAddress = (Connector.StringArgument) args.get("localAddress"); // NOI18N
                if (localAddress != null) {
                    localAddress.setValue("127.0.0.1"); // NOI18N
                }
                String address = null;
                try {
                    address = lc.startListening (args);
                } catch (java.io.IOException ioex) {
                    boolean passed = false;
                    // workaround for issue 148490
                    if (SHMEM_TRANSPORT.equals(transport)) {
                        Connector.StringArgument argName = (Connector.StringArgument) args.get("name"); // NOI18N
                        for (int x = 0; x < 5; x++) {
                            String tryAddress = "javadebug" + Math.round(Math.random() * 10000); // NOI18N
                            try {
                                argName.setValue (tryAddress);
                                address = lc.startListening (args);
                                passed = true;
                                break;
                            } catch (Exception e) {
                                // ignore
                            }
                        } // for
                    }
                    if (!passed) {
                        getProject().log("Listening failed with arguments: "+args);
                        throw ioex;
                    }
                } catch (com.sun.jdi.connect.IllegalConnectorArgumentsException iaex) {
                    getProject().log("Listening failed with arguments: "+args);
                    throw iaex;
                }
                /* A fix to bug http://developer.java.sun.com/developer/bugParade/bugs/4932074.html has been integrated into JDK 1.5
                // Uncomment if the fix is not complete in all cases
                // This code parses the address string "HOST:PORT" to extract PORT and then point debugee to localhost:PORT
                // This is NOT a clean solution to the problem but it SHOULD work in 99% cases
                if (SOCKET_TRANSPORT.equals(transport)) {
                    int port = -1;
                    try {
                        port = Integer.parseInt (address.substring (address.indexOf (':') + 1));
                        Connector.IntegerArgument portArg = (Connector.IntegerArgument) args.get("port"); // NOI18N
                        portArg.setValue (port);
                        address = "localhost:" + port; // NOI18N
                    } catch (Exception e) {
                        // this address format is not known, use default
                    }
                }*/
                if (SOCKET_TRANSPORT.equals(transport)) {
                    try {
                        int port = Integer.parseInt (address.substring (address.indexOf (':') + 1));
                        Connector.IntegerArgument portArg = (Connector.IntegerArgument) args.get("port"); // NOI18N
                        portArg.setValue (port);
                        // Since some users have badly configured host addresses,
                        // perform a check for the address and use "localhost"
                        // if the address can not be resolved: (see http://www.netbeans.org/issues/show_bug.cgi?id=154974)
                        String host = address.substring(0, address.indexOf (':'));
                        logger.fine("  socket listening at " + address+", host = "+host+", port = "+port); // NOI18N
                        try {
                            InetAddress.getByName(host);
                        } catch (UnknownHostException uhex) {
                            logger.fine(  "unknown host '"+host+"'");
                            address = "localhost:" + port; // NOI18N
                        } catch (SecurityException  se) {}
                    } catch (Exception e) {
                        // ignore
                    }
                }
                if (SHMEM_TRANSPORT.equals(transport)) {
                    try {
                        Connector.StringArgument name = (Connector.StringArgument) args.get("name"); // NOI18N
                        name.setValue (address);
                    } catch (Exception e) {
                        // ignore
                    }
                }
                getProject ().setNewProperty (getAddressProperty (), address);

                debug ("Creating source path"); // NOI18N
                ClassPath sourcePath = createSourcePath (
                    getProject (),
                    classpath,
                    plainSourcepath,
                    isSourcePathExclusive
                );
                ClassPath jdkSourcePath = createJDKSourcePath (
                    getProject (),
                    bootclasspath
                );
                if (logger.isLoggable(Level.FINE)) {
                    logger.fine("Create sourcepath:"); // NOI18N
                    logger.fine("    classpath : " + classpath); // NOI18N
                    logger.fine("    sourcepath : " + plainSourcepath); // NOI18N
                    logger.fine("    bootclasspath : " + bootclasspath); // NOI18N
                    logger.fine("    >> sourcePath : " + sourcePath); // NOI18N
                    logger.fine("    >> jdkSourcePath : " + jdkSourcePath); // NOI18N
                }

                Breakpoint first = null;

                if (stopClassName != null && stopClassName.length() > 0) {
                    logger.fine(
                            "create method breakpoint, class name = " + // NOI18N
                            stopClassName
                        );
                    first = createBreakpoint (stopClassName);
                }

                debug ("Debugger started"); // NOI18N
                logger.fine("start listening at " + address); // NOI18N

                final Map properties = new HashMap ();
                // uncomment to implement smart stepping with step-outs
                // rather than step-ins (for J2ME)
                // props.put("SS_ACTION_STEPOUT", Boolean.TRUE);
                properties.put ("sourcepath", sourcePath); // NOI18N
                properties.put ("name", getName ()); // NOI18N
                properties.put ("jdksources", jdkSourcePath); // NOI18N
                properties.put ("listeningCP", listeningCP); // NOI18N
                String workDir = getProject().getProperty("work.dir");
                File baseDir;
                if (workDir != null) {
                    baseDir = new File(workDir);
                } else {
                    baseDir = getProject().getBaseDir();
                }
                properties.put ("baseDir", baseDir); // NOI18N

                logger.fine("JPDAStart: properties = "+properties);

                final ListeningConnector flc = lc;
                final WeakReference<Session> startedSessionRef[] = new WeakReference[] { new WeakReference<Session>(null) };

                Map<URL, ArtifactsUpdated> listeners = new HashMap<URL, ArtifactsUpdated>();
                List<Breakpoint> artificialBreakpoints = new LinkedList<Breakpoint>();
                if (listeningCP != null) {
                    ExceptionBreakpoint b = createCompilationErrorBreakpoint();
                    DebuggerManager.getDebuggerManager ().addBreakpoint (b);
                    artificialBreakpoints.add(b);
                }

                DebuggerManager.getDebuggerManager().addDebuggerListener(
                        DebuggerManager.PROP_DEBUGGER_ENGINES,
                        new Listener(first, artificialBreakpoints, listeners, startedSessionRef, rp));

                // Let it start asynchronously so that the script can go on and start the debuggee
                final Thread[] listeningThreadPtr = new Thread[] { null };
                final boolean[] listeningStarted = new boolean[] { false };
                rp.post(new Runnable() {
                    public void run() {
                        synchronized (listeningStarted) {
                            listeningThreadPtr[0] = Thread.currentThread();
                            listeningStarted[0] = true;
                            listeningStarted.notifyAll();
                        }
                        try {
                            DebuggerEngine[] engines = JPDADebugger.startListeningAndGetEngines (
                                flc,
                                args,
                                new Object[] { properties }
                            );
                            startedSessionRef[0] = new WeakReference(engines[0].lookupFirst(null, Session.class));
                        } catch (DebuggerStartException dsex) {
                            // Was not able to start up
                        } finally {
                            synchronized (listeningStarted) {
                                listeningThreadPtr[0] = null;
                                listeningStarted.notifyAll();
                            }
                        }
                    }
                });

                logger.log(Level.FINE, "adding a BuildListener to project {0} in {1}", new Object[] {getProject().getName(), getProject().getBaseDir()});
                getProject().addBuildListener(new BuildListener() {

                    public void messageLogged(BuildEvent event) {}
                    public void taskStarted(BuildEvent event) { }
                    public void taskFinished(BuildEvent event) {}
                    public void targetStarted(BuildEvent event) {}
                    public void targetFinished(BuildEvent event) {}
                    public void buildStarted(BuildEvent event) {}
                    public void buildFinished(BuildEvent event) {
                        // First wait until listening actually starts:
                        logger.fine("buildFinished: waiting for listening start...");
                        synchronized (listeningStarted) {
                            if (!listeningStarted[0]) {
                                try {
                                    listeningStarted.wait();
                                } catch (InterruptedException ex) {}
                            }
                        }
                        logger.fine("buildFinished: stopping listening...");
                        // Then stop it:
                        try {
                            flc.stopListening(args);
                        } catch (java.io.IOException ioex) {
                        } catch (com.sun.jdi.connect.IllegalConnectorArgumentsException iaex) {
                        }
                        logger.fine("buildFinished: interrupting listening thread...");
                        // If the listening is still running, interrupt it:
                        for (int i = 0; i < 10; i++) {
                            synchronized (listeningStarted) {
                                logger.fine("buildFinished: listening thread = "+listeningThreadPtr[0]);
                                if (listeningThreadPtr[0] != null) {
                                    listeningThreadPtr[0].interrupt();
                                    try {
                                        listeningStarted.wait(500);
                                    } catch (InterruptedException ex) {}
                                } else {
                                    break;
                                }
                            }
                        }
                        // Finally, kill the started session:
                        Session s = startedSessionRef[0].get();
                        logger.fine("buildFinished: killing session "+s);
                        if (s != null) {
                            s.kill();
                        }
                    }

                });
            } catch (java.io.IOException ioex) {
                lock[1] = ioex;
            } catch (com.sun.jdi.connect.IllegalConnectorArgumentsException icaex) {
                lock[1] = icaex;
            } catch (ThreadDeath td) {
                // Session was canceled - see issue #148483
                lock[1] = td;
            } finally {
                debug ("Notifying"); // NOI18N
                lock.notify ();
            }
        }
    } // run ()


    // support methods .........................................................

    private MethodBreakpoint createBreakpoint (String stopClassName) {
        MethodBreakpoint breakpoint = MethodBreakpoint.create (
            stopClassName,
            "*"
        );
        breakpoint.setHidden (true);
        DebuggerManager.getDebuggerManager ().addBreakpoint (breakpoint);
        return breakpoint;
    }

    private ExceptionBreakpoint createCompilationErrorBreakpoint() {
        ExceptionBreakpoint b = ExceptionBreakpoint.create("java.lang.RuntimeException", ExceptionBreakpoint.TYPE_EXCEPTION_UNCATCHED);
        b.setHidden (true);
        b.addJPDABreakpointListener(new JPDABreakpointListener() {
            public void breakpointReached(JPDABreakpointEvent event) {
                boolean suspend = false;
                try {
                    if (event.getVariable() instanceof ObjectVariable) {
                        ObjectVariable ov = (ObjectVariable) event.getVariable();
                        JPDAClassType ct = ov.getClassType();
                        if (ct != null) {
                            suspend = "java.lang.RuntimeException".equals(ct.getName());
                            if (suspend) {
                                java.lang.reflect.Method invokeMethodMethod = ov.getClass().getMethod("invokeMethod", JPDAThread.class, String.class, String.class, Variable[].class);
                                invokeMethodMethod.setAccessible(true);
                                Variable message = (Variable) invokeMethodMethod.invoke(ov, event.getThread(), "getMessage", "()Ljava/lang/String;", new Variable[0]);
                                if (message != null) {
                                    suspend = message.getValue().startsWith("\"Uncompilable source code");
                                }
                                //suspend = suspend && ov.invokeMethod("getMessage", "()Ljava/lang/String;", new Variable[0]).getValue().startsWith("\"Uncompilable source code");
                            }
                        }
                    }
                } catch (IllegalAccessException iaex) {
                    logger.log(Level.FINE, null, iaex);
                } catch (java.lang.reflect.InvocationTargetException itex) {
                    logger.log(Level.FINE, null, itex);
                } catch (NoSuchMethodException ex) {
                    logger.log(Level.FINE, null, ex);
                //} catch (InvalidExpressionException ex) {
                //    logger.log(Level.FINE, null, ex);
                }

                if (!suspend) {
                    event.resume();
                }
            }
        });
        b.setPrintText(NbBundle.getBundle("org/netbeans/modules/debugger/jpda/ant/Bundle").getString("MSG_StoppedOnCompileError"));
        return b;
    }

    private final static void debug (String msg) {
        if (!logger.isLoggable(Level.FINER)) return;
        logger.finer (
            new Date() + " [" + Thread.currentThread().getName() +
            "] - " + msg
        );
    }

    static ClassPath createSourcePath (
        Project project,
        Path classpath,
        Path sourcepath,
        boolean isSourcePathExclusive
    ) {
        if (sourcepath != null && isSourcePathExclusive) {
            return convertToClassPath (project, sourcepath);
        }
        ClassPath cp = convertToSourcePath (project, classpath, true);
        ClassPath sp = convertToClassPath (project, sourcepath);

        ClassPath sourcePath = ClassPathSupport.createProxyClassPath (
            new ClassPath[] {cp, sp}
        );
        return sourcePath;
    }

    static ClassPath createJDKSourcePath (
        Project project,
        Path bootclasspath
    ) {
        if (bootclasspath == null) {
            // if current platform is default one, bootclasspath is set to null
            JavaPlatform jp = JavaPlatform.getDefault();
            if (jp != null) {
                return jp.getSourceFolders ();
            } else {
                return ClassPathSupport.createClassPath(java.util.Collections.EMPTY_LIST);
            }
        } else {
            return convertToSourcePath (project, bootclasspath, false);
        }
    }

    private static ClassPath convertToClassPath (Project project, Path path) {
        String[] paths = path == null ? new String [0] : path.list ();
        List l = new ArrayList ();
        int i, k = paths.length;
        for (i = 0; i < k; i++) {
            String pathName = project.replaceProperties(paths[i]);
            File f = FileUtil.normalizeFile (project.resolveFile (pathName));
            if (!isValid (f, project)) continue;
            URL url = fileToURL (f, project, true, false);
            if (url == null) continue;
            l.add (url);
        }
        URL[] urls = (URL[]) l.toArray (new URL [l.size ()]);
        return ClassPathSupport.createClassPath (urls);
    }

    /**
     * This method uses SourceForBinaryQuery to find sources for each
     * path item and returns them as ClassPath instance. All path items for which
     * the sources were not found are omitted.
     *
     */
    private static ClassPath convertToSourcePath (Project project, Path path, boolean reportNonExistingFiles) {
        String[] paths = path == null ? new String [0] : path.list ();
        List l = new ArrayList ();
        Set exist = new HashSet ();
        int i, k = paths.length;
        for (i = 0; i < k; i++) {
            String pathName = project.replaceProperties(paths[i]);
            File file = FileUtil.normalizeFile
                (project.resolveFile (pathName));
            if (!isValid (file, project)) continue;
            URL url = fileToURL (file, project, reportNonExistingFiles, true);
            if (url == null) continue;
            logger.fine("convertToSourcePath - class: " + url); // NOI18N
            try {
                SourceForBinaryQuery.Result srcRootsResult = SourceForBinaryQuery.findSourceRoots(url);
                FileObject fos[] = srcRootsResult.getRoots();
                int j, jj = fos.length;
                logger.fine("  source roots = "+java.util.Arrays.asList(fos)+"; jj = "+jj);
                /* ?? (#60640)
                if (jj == 0) { // no sourcepath defined
                    // Take all registered source roots
                    Set allSourceRoots = GlobalPathRegistry.getDefault().getSourceRoots();
                    fos = (FileObject[]) allSourceRoots.toArray(new FileObject[0]);
                    jj = fos.length;
                }
                 */
                for (j = 0; j < jj; j++) {
                    logger.fine("convertToSourcePath - source : " + fos [j]); // NOI18N
                    if (FileUtil.isArchiveFile (fos [j]))
                        fos [j] = FileUtil.getArchiveRoot (fos [j]);
                    try {
                        url = fos [j].getURL ();
                    } catch (FileStateInvalidException ex) {
                        ErrorManager.getDefault ().notify
                            (ErrorManager.EXCEPTION, ex);
                        continue;
                    }
                    if (url == null) continue;
                    if (!exist.contains (url)) {
                        l.add (ClassPathSupport.createResource (url));
                        exist.add (url);
                    }
                } // for
            } catch (IllegalArgumentException ex) {
                ErrorManager.getDefault().notify(ErrorManager.EXCEPTION, ex);
                logger.fine("Have illegal url! "+ex.getLocalizedMessage()); // NOI18N
            }
        }
        return ClassPathSupport.createClassPath (l);
    }


    private static URL fileToURL (File file, Project project, boolean reportNonExistingFiles, boolean withSlash) {
        try {
            FileObject fileObject = FileUtil.toFileObject (file);
            if (fileObject == null) {
                if (reportNonExistingFiles) {
                    String path = file.getAbsolutePath();
                    project.log("Have no file for "+path, Project.MSG_WARN);
                }
                return null;
            }
            if (FileUtil.isArchiveFile (fileObject)) {
                fileObject = FileUtil.getArchiveRoot (fileObject);
                if (fileObject == null) {
                    project.log("Bad archive "+file.getAbsolutePath(), Project.MSG_WARN);
                    /*
                    ErrorManager.getDefault().notify(ErrorManager.getDefault().annotate(
                            new NullPointerException("Bad archive "+file.toString()),
                            NbBundle.getMessage(JPDAStart.class, "MSG_WrongArchive", file.getAbsolutePath())));
                     */
                    return null;
                }
            }
            if (withSlash) {
                return FileUtil.urlForArchiveOrDir(file);
            } else {
                return fileObject.getURL ();
            }
        } catch (FileStateInvalidException e) {
            ErrorManager.getDefault ().notify (ErrorManager.EXCEPTION, e);
            return null;
        }
    }

    private static boolean isValid (File f, Project project) {
        if (f.getPath ().indexOf ("${") != -1 && !f.exists ()) { // NOI18N
            project.log (
                "Classpath item " + f + " will be ignored.",  // NOI18N
                Project.MSG_VERBOSE
            );
            return false;
        }
        return true;
    }


    // innerclasses ............................................................

    public static class Sourcepath extends Path {

        private boolean isExclusive;
        private String path = null;
        private Path plainPath;

        public Sourcepath(Project p) {
            super(p);
            logger.fine("new Sourcepath("+p+")");
        }

        public Sourcepath(Project p, String path) {
            super(p, path);
            this.path = path;
            logger.fine("new Sourcepath("+p+", "+path+")");
        }

        public void setExclusive(String exclusive) {
            isExclusive = "true".equalsIgnoreCase(exclusive);
        }

        boolean isExclusive() {
            return isExclusive;
        }

        public Path getPlainPath() {
            if (plainPath == null) {
                if (getRefid() != null) {
                    Path pp;
                    if (path != null) {
                        pp = new Path(getProject(), path);
                    } else {
                        pp = new Path(getProject());
                    }
                    pp.setLocation(getLocation());
                    pp.setDescription(getDescription());
                    pp.setRefid(getRefid());
                    //pp.setChecked(isChecked());
                    //pp.union = union == null ? union : (Union) union.clone();
                    plainPath = pp;
                } else {
                    plainPath = this;
                }
            }
            return plainPath;
        }

    }

    private static class Listener extends DebuggerManagerAdapter {

        private final PropertyChangeListener pcl = WeakListeners.propertyChange(this, null);

        private Set<DebuggerEngine> engines = new HashSet<DebuggerEngine>();

        private Breakpoint first;
        private final List<Breakpoint> artificalBreakpoints;
        private final Map<URL, ArtifactsUpdated> listeners;
        private final WeakReference<Session> startedSessionRef[];
        private boolean enginesCheckDone = false;
        private final RequestProcessor rp;

        private Listener(Breakpoint first,
                         List<Breakpoint> artificalBreakpoints,
                         Map<URL, ArtifactsUpdated> listeners,
                         WeakReference<Session> startedSessionRef[],
                         RequestProcessor rp) {
            this.first = first;
            this.artificalBreakpoints = artificalBreakpoints;
            this.listeners = listeners;
            this.startedSessionRef = startedSessionRef;
            this.rp = rp;
        }

        @Override
        public void propertyChange (final PropertyChangeEvent e) {
            if (JPDADebugger.PROP_STATE.equals(e.getPropertyName ())) {
                int state = ((Integer) e.getNewValue ()).intValue ();
                if (state == JPDADebugger.STATE_STOPPED || state == JPDADebugger.STATE_DISCONNECTED) {
                    rp.post(new Runnable() {
                        public void run() {
                            if (first != null) {
                                DebuggerManager.getDebuggerManager().removeBreakpoint(first);
                                first = null;
                                ((JPDADebugger) e.getSource()).removePropertyChangeListener(JPDADebugger.PROP_STATE, pcl);
                            }
                        }
                    });
                }
            }
            return;
        }

        private void dispose() {
            DebuggerManager.getDebuggerManager ().removeDebuggerListener (
                DebuggerManager.PROP_DEBUGGER_ENGINES,
                this
            );
            rp.post (new Runnable () {
                public void run () {
                    if (artificalBreakpoints != null) {
                        for (Breakpoint b : artificalBreakpoints) {
                            DebuggerManager.getDebuggerManager().removeBreakpoint(b);
                        }
                    }
                    if (first != null) {
                        DebuggerManager.getDebuggerManager().removeBreakpoint(first);
                    }
                    if (listeners != null) {
                        for (Entry<URL, ArtifactsUpdated> e : listeners.entrySet()) {
                            BuildArtifactMapper.removeArtifactsUpdatedListener(e.getKey(), e.getValue());
                        }
                    }
                }
            });
        }

        @Override
        public void engineAdded (DebuggerEngine engine) {
            // Consider only engines from the started session.
            Session session;
            synchronized (startedSessionRef) {
                session = startedSessionRef[0].get();
            }
            if (session != null) {
                // perform check
                boolean hasEngine = false;
                for (String l : session.getSupportedLanguages()) {
                    if (engine.equals(session.getEngineForLanguage(l))) {
                        hasEngine = true;
                        break;
                    }
                }
                if (!hasEngine) {
                    return;
                }
            }
            JPDADebugger debugger = engine.lookupFirst(null, JPDADebugger.class);
            if (debugger == null) return;
            debugger.addPropertyChangeListener (
                JPDADebugger.PROP_STATE,
                pcl
            );
            engines.add(engine);
        }

        @Override
        public void engineRemoved (DebuggerEngine engine) {
            Session session;
            synchronized (startedSessionRef) {
                session = startedSessionRef[0].get();
            }
            if (session != null && !enginesCheckDone) {
                // check each registered engine if it belong to the session
                enginesCheckDone = true;
                List<DebuggerEngine> list = new ArrayList<DebuggerEngine>(engines);
                for (DebuggerEngine eng : list) {
                    boolean hasEngine = false;
                    for (String l : session.getSupportedLanguages()) {
                        if (engine.equals(session.getEngineForLanguage(l))) {
                            hasEngine = true;
                            break;
                        }
                    }
                    if (!hasEngine) {
                        engines.remove(eng);
                    }
                }
            }
            JPDADebugger debugger = engine.lookupFirst(null, JPDADebugger.class);
            if (debugger == null) return;
            if (engines.remove(engine)) {
                debugger.removePropertyChangeListener (
                    JPDADebugger.PROP_STATE,
                    pcl
                );
            }
            if (engines.isEmpty()) {
                dispose();
            }
        }
    }

}