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 1997-2007 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:
042: package org.netbeans.modules.cnd.api.model;
043:
044: import java.util.Collection;
045: import java.util.Collections;
046: import org.openide.util.Lookup;
047:
048: /**
049: * utility class to access Csm model
050: * @author Vladimir Voskresensky
051: */
052: public final class CsmModelAccessor {
053:
054: // singleton instance of model
055: private static CsmModel model;
056: private static CsmModel dummy;
057:
058: private static CsmModelStateListener stateListener = new CsmModelStateListener() {
059: public void modelStateChanged(CsmModelState newState,
060: CsmModelState oldState) {
061: if (newState == CsmModelState.OFF) {
062: CsmListeners.getDefault().removeModelStateListener(
063: stateListener);
064: model = null;
065: }
066: }
067: };
068:
069: public static CsmModelState getModelState() {
070: CsmModel aModel = model;
071: return (aModel == null) ? CsmModelState.OFF : aModel.getState();
072: }
073:
074: private static class ModelStub implements CsmModel {
075:
076: public Collection<CsmProject> projects() {
077: return Collections.<CsmProject> emptyList();
078: }
079:
080: public CsmProject getProject(Object id) {
081: return null;
082: }
083:
084: public CsmFile findFile(CharSequence absPath) {
085: return null;
086: }
087:
088: public CsmModelState getState() {
089: return CsmModelState.OFF;
090: }
091:
092: public void enqueue(Runnable task) {
093: }
094:
095: public void enqueue(Runnable task, CharSequence name) {
096: }
097:
098: }
099:
100: /** Creates a new instance of CsmModelAccessor */
101: private CsmModelAccessor() {
102: }
103:
104: private static final boolean TRACE_GET_MODEL = Boolean
105: .getBoolean("trace.get.model");
106:
107: /**
108: * Gets CsmModel using Lookup
109: */
110: public static CsmModel getModel() {
111: if (TRACE_GET_MODEL) {
112: Thread.dumpStack();
113: }
114: if (model == null) {
115: synchronized (CsmModel.class) {
116: if (model == null) {
117: model = (CsmModel) Lookup.getDefault().lookup(
118: CsmModel.class);
119: if (model == null) {
120: return getStub();
121: } else {
122: CsmListeners.getDefault()
123: .addModelStateListener(stateListener);
124: }
125: }
126: }
127: }
128: return model;
129: }
130:
131: private static CsmModel getStub() {
132: if (dummy == null) {
133: dummy = new ModelStub();
134: }
135: return dummy;
136: }
137: }
|