| /* |
| * Copyright (c) 1998, 2007, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.hotspot.igv.util; |
| |
| import java.awt.EventQueue; |
| import org.openide.util.ContextAwareAction; |
| import org.openide.util.Lookup; |
| import org.openide.util.LookupEvent; |
| import org.openide.util.LookupListener; |
| import org.openide.util.Utilities; |
| import org.openide.util.actions.CallableSystemAction; |
| |
| /** |
| * |
| * @author Thomas Wuerthinger |
| */ |
| public abstract class ContextAction<T> extends CallableSystemAction implements LookupListener, ContextAwareAction { |
| |
| private Lookup context = null; |
| private Lookup.Result<T> result = null; |
| |
| public ContextAction() { |
| this(Utilities.actionsGlobalContext()); |
| } |
| |
| public ContextAction(Lookup context) { |
| init(context); |
| } |
| |
| private void init(Lookup context) { |
| this.context = context; |
| result = context.lookupResult(contextClass()); |
| result.addLookupListener(this); |
| resultChanged(null); |
| } |
| |
| public void resultChanged(LookupEvent e) { |
| if (result.allItems().size() != 0) { |
| update(result.allInstances().iterator().next()); |
| } else { |
| update(null); |
| } |
| } |
| |
| @Override |
| public void performAction() { |
| final T t = result.allInstances().iterator().next(); |
| |
| // Ensure it's AWT event thread |
| EventQueue.invokeLater(new Runnable() { |
| |
| public void run() { |
| performAction(t); |
| } |
| }); |
| } |
| |
| public void update(T t) { |
| if (t == null) { |
| setEnabled(false); |
| } else { |
| setEnabled(isEnabled(t)); |
| } |
| } |
| |
| public boolean isEnabled(T context) { |
| return true; |
| } |
| |
| public abstract Class<T> contextClass(); |
| |
| public abstract void performAction(T context); |
| } |