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:
042: package org.netbeans.modules.dbapi;
043:
044: import java.util.ArrayList;
045: import java.util.Collection;
046: import java.util.Iterator;
047: import java.util.List;
048: import java.util.concurrent.CopyOnWriteArrayList;
049: import javax.swing.event.ChangeEvent;
050: import javax.swing.event.ChangeListener;
051: import org.netbeans.modules.db.api.explorer.NodeProvider;
052: import org.netbeans.modules.db.explorer.DbNodeLoader;
053: import org.openide.nodes.Node;
054: import org.openide.util.lookup.Lookups;
055:
056: /**
057: * Loads nodes from all registered node providers and delivers them to
058: * the caller of getAllNodes().
059: *
060: * @author David Van Couvering
061: */
062: public class DbNodeLoaderImpl implements DbNodeLoader, ChangeListener {
063:
064: /**
065: * Not private because used in the tests.
066: */
067: static final String NODE_PROVIDER_PATH = "Databases/NodeProviders"; // NOI18N
068: final CopyOnWriteArrayList<ChangeListener> listeners = new CopyOnWriteArrayList<ChangeListener>();
069:
070: public List<Node> getAllNodes() {
071: List<Node> nodes = new ArrayList<Node>();
072: Collection providers = Lookups.forPath(NODE_PROVIDER_PATH)
073: .lookupAll(NodeProvider.class);
074:
075: for (Iterator i = providers.iterator(); i.hasNext();) {
076: NodeProvider provider = (NodeProvider) i.next();
077: nodes.addAll(provider.getNodes());
078:
079: provider.addChangeListener(this );
080: }
081:
082: return nodes;
083: }
084:
085: public void addChangeListener(ChangeListener listener) {
086: listeners.add(listener);
087: }
088:
089: public void removeChangeListener(ChangeListener listener) {
090: listeners.remove(listener);
091: }
092:
093: public synchronized void stateChanged(ChangeEvent evt) {
094: // At this point, any state change simply means that the consumer
095: // should re-call getAllNodes(), so delegate the state change up to
096: // the consumer.
097: for (ChangeListener listener : listeners) {
098: listener.stateChanged(new ChangeEvent(this));
099: }
100: }
101: }
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