01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common
08: * Development and Distribution License("CDDL") (collectively, the
09: * "License"). You may not use this file except in compliance with the
10: * License. You can obtain a copy of the License at
11: * http://www.netbeans.org/cddl-gplv2.html
12: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
13: * specific language governing permissions and limitations under the
14: * License. When distributing the software, include this License Header
15: * Notice in each file and include the License file at
16: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
17: * particular file as subject to the "Classpath" exception as provided
18: * by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the
20: * License Header, with the fields enclosed by brackets [] replaced by
21: * your own identifying information:
22: * "Portions Copyrighted [year] [name of copyright owner]"
23: *
24: * Contributor(s):
25: *
26: * The Original Software is NetBeans. The Initial Developer of the Original
27: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
28: * Microsystems, Inc. All Rights Reserved.
29: *
30: * If you wish your version of this file to be governed by only the CDDL
31: * or only the GPL Version 2, indicate your decision by adding
32: * "[Contributor] elects to include this software in this distribution
33: * under the [CDDL or GPL Version 2] license." If you do not indicate a
34: * single choice of license, a recipient has the option to distribute
35: * your version of this file under either the CDDL, the GPL Version 2 or
36: * to extend the choice of license to its licensees as provided above.
37: * However, if you add GPL Version 2 code and therefore, elected the GPL
38: * Version 2 license, then the option applies only if the new code is
39: * made subject to such option by the copyright holder.
40: */
41: package org.openide.nodes;
42:
43: import java.util.Collections;
44: import java.util.LinkedList;
45: import java.util.List;
46:
47: /**
48: * Synchronous children implementation that takes a ChildFactory.
49: *
50: * @author Tim Boudreau
51: */
52: final class SynchChildren<T> extends Children.Keys<T> implements
53: ChildFactory.Observer {
54: private final ChildFactory<T> factory;
55:
56: /** Creates a new instance of SynchChildren
57: * @param factory An instance of ChildFactory which will provide keys,
58: * values, nodes
59: */
60: SynchChildren(ChildFactory<T> factory) {
61: this .factory = factory;
62: factory.setObserver(this );
63: }
64:
65: volatile boolean active = false;
66:
67: protected @Override
68: void addNotify() {
69: active = true;
70: refresh(true);
71: }
72:
73: protected @Override
74: void removeNotify() {
75: active = false;
76: setKeys(Collections.<T> emptyList());
77: }
78:
79: protected Node[] createNodes(T key) {
80: return factory.createNodesForKey(key);
81: }
82:
83: public void refresh(boolean immediate) {
84: if (active) {
85: List<T> toPopulate = new LinkedList<T>();
86: while (!factory.createKeys(toPopulate)) {
87: }
88: setKeys(toPopulate);
89: }
90: }
91: }
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