001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041: package org.netbeans.modules.gsfret.editor.semantic;
042:
043: import org.netbeans.modules.gsf.api.CancellableTask;
044:
045: /**
046: * This file is originally from Retouche, the Java Support
047: * infrastructure in NetBeans. I have modified the file as little
048: * as possible to make merging Retouche fixes back as simple as
049: * possible.
050: *
051: *
052: * @author Jan Lahoda
053: */
054: public abstract class ScanningCancellableTask<T> implements
055: CancellableTask<T> {
056:
057: private boolean canceled;
058:
059: /** Creates a new instance of ScanningCancellableTask */
060: protected ScanningCancellableTask() {
061: }
062:
063: public final synchronized void cancel() {
064: System.err
065: .println("ScanningCancellableTask.cancel: Not yet implemented");
066: // canceled = true;
067: //
068: // if (pathScanner != null) {
069: // pathScanner.cancel();
070: // }
071: // if (scanner != null) {
072: // scanner.cancel();
073: // }
074: }
075:
076: public abstract void run(T parameter) throws Exception;
077:
078: protected final synchronized boolean isCancelled() {
079: return canceled;
080: }
081:
082: protected final synchronized void resume() {
083: canceled = false;
084: }
085:
086: // private CancellableTreePathScanner pathScanner;
087: // private CancellableTreeScanner scanner;
088: //
089: // protected <R, P> R scan(CancellableTreePathScanner<R, P> scanner, Tree toScan, P p) {
090: // if (isCancelled())
091: // return null;
092: //
093: // try {
094: // synchronized (this) {
095: // this.pathScanner = scanner;
096: // }
097: //
098: // if (isCancelled())
099: // return null;
100: //
101: // return scanner.scan(toScan, p);
102: // } finally {
103: // synchronized (this) {
104: // this.pathScanner = null;
105: // }
106: // }
107: // }
108: //
109: // protected <R, P> R scan(CancellableTreeScanner<R, P> scanner, Tree toScan, P p) {
110: // if (isCancelled())
111: // return null;
112: //
113: // try {
114: // synchronized (this) {
115: // this.scanner = scanner;
116: // }
117: //
118: // if (isCancelled())
119: // return null;
120: //
121: // return scanner.scan(toScan, p);
122: // } finally {
123: // synchronized (this) {
124: // this.scanner = null;
125: // }
126: // }
127: // }
128: //
129: }
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