<file name="org-netbeans-modules-debugger-jpda-ui-actions-EvaluateAction.instance"/>

        <file name="D-F9.shadow">

            <attr name="originalFile" stringvalue="Actions/Debug/org-netbeans-modules-debugger-jpda-ui-actions-EvaluateAction.instance"/>

        </file>

/*

 * 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.

 * Other names may be trademarks of their respective owners.

 *

 * 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

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 * The Original Software is NetBeans. The Initial Developer of the Original

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package org.netbeans.modules.debugger.jpda.ui.actions;

import java.awt.event.ActionEvent;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.lang.ref.Reference;

import java.lang.ref.WeakReference;

import javax.swing.AbstractAction;

import javax.swing.Action;

import javax.swing.SwingUtilities;

import org.netbeans.api.debugger.DebuggerEngine;

import org.netbeans.api.debugger.DebuggerManager;

import org.netbeans.api.debugger.DebuggerManagerAdapter;

import org.netbeans.api.debugger.jpda.JPDADebugger;

import org.netbeans.modules.debugger.jpda.ui.CodeEvaluator;

import org.openide.util.NbBundle;

/**

 * Invokes the expression evaluator GUI

 *

 * @author Martin Entlicher

 */

public class EvaluateAction extends AbstractAction implements PropertyChangeListener,

                                                              Runnable {

    private EnableListener listener;

    private transient Reference lastDebuggerRef = new WeakReference(null);

    public EvaluateAction () {

//        listener = new EnableListener (this);

//        DebuggerManager.getDebuggerManager().addDebuggerListener(

//                DebuggerManager.PROP_CURRENT_ENGINE,

//                listener);

        putValue (

            Action.NAME,

            NbBundle.getMessage(EvaluateAction.class, "CTL_Evaluate") // NOI18N

        );

//        checkEnabled();

    }

    private synchronized boolean canBeEnabled() {

        DebuggerEngine de = DebuggerManager.getDebuggerManager().getCurrentEngine();

        if (de == null) return false;

        JPDADebugger debugger = de.lookupFirst(null, JPDADebugger.class);

        JPDADebugger lastDebugger = (JPDADebugger) lastDebuggerRef.get();

        if (lastDebugger != null && debugger != lastDebugger) {

            lastDebugger.removePropertyChangeListener(

                    JPDADebugger.PROP_CURRENT_THREAD,

                    this);

            lastDebuggerRef = new WeakReference(null);

        }

        if (debugger != null) {

            lastDebuggerRef = new WeakReference(debugger);

            debugger.addPropertyChangeListener(

                    JPDADebugger.PROP_CURRENT_THREAD,

                    this);

            return (debugger.getCurrentThread() != null);

        } else {

            return false;

        }

    }

    private void checkEnabled() {

        SwingUtilities.invokeLater(this);

    }

    public void run() {

        setEnabled(canBeEnabled());

    }

    public void actionPerformed (ActionEvent evt) {

//        DebuggerEngine de = DebuggerManager.getDebuggerManager().getCurrentEngine();

//        if (de == null) return;

//        JPDADebugger debugger = de.lookupFirst(null, JPDADebugger.class);

//        if (debugger == null) return;

        CodeEvaluator.openEvaluator();

        // Evaluator2.open(debugger);

    }

    public void propertyChange(PropertyChangeEvent propertyChangeEvent) {

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                synchronized (this) {

                    JPDADebugger lastDebugger = (JPDADebugger) lastDebuggerRef.get();

                    if (lastDebugger != null) {

                        setEnabled(lastDebugger.getCurrentThread() != null);

                    }

                }

            }

        });

    }

    @Override

    protected void finalize() throws Throwable {

//        DebuggerManager.getDebuggerManager().removeDebuggerListener(

//                DebuggerManager.PROP_CURRENT_ENGINE,

//                listener);

    }

    private static class EnableListener extends DebuggerManagerAdapter {

        private Reference actionRef;

        public EnableListener(EvaluateAction action) {

            actionRef = new WeakReference(action);

        }

        @Override

        public void propertyChange(PropertyChangeEvent evt) {

            EvaluateAction action = (EvaluateAction) actionRef.get();

            if (action != null) {

                action.checkEnabled();

            }

        }

    }

}