/projects/netbeans-7.3/core.windows/src/org/netbeans/core/windows/RecentViewList.java
Java | 169 lines | 90 code | 16 blank | 63 comment | 23 complexity | 24f264622d31bf509815b6f20bcbd4c3 MD5 | raw file
- /*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.
- *
- * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
- * Other names may be trademarks of their respective owners.
- *
- * The contents of this file are subject to the terms of either the GNU
- * General Public License Version 2 only ("GPL") or the Common
- * Development and Distribution License("CDDL") (collectively, the
- * "License"). You may not use this file except in compliance with the
- * License. You can obtain a copy of the License at
- * http://www.netbeans.org/cddl-gplv2.html
- * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
- * specific language governing permissions and limitations under the
- * License. When distributing the software, include this License Header
- * Notice in each file and include the License file at
- * nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the GPL Version 2 section of the License file that
- * accompanied this code. If applicable, add the following below the
- * License Header, with the fields enclosed by brackets [] replaced by
- * your own identifying information:
- * "Portions Copyrighted [year] [name of copyright owner]"
- *
- * Contributor(s):
- *
- * The Original Software is NetBeans. The Initial Developer of the Original
- * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
- * Microsystems, Inc. All Rights Reserved.
- *
- * If you wish your version of this file to be governed by only the CDDL
- * or only the GPL Version 2, indicate your decision by adding
- * "[Contributor] elects to include this software in this distribution
- * under the [CDDL or GPL Version 2] license." If you do not indicate a
- * single choice of license, a recipient has the option to distribute
- * your version of this file under either the CDDL, the GPL Version 2 or
- * to extend the choice of license to its licensees as provided above.
- * However, if you add GPL Version 2 code and therefore, elected the GPL
- * Version 2 license, then the option applies only if the new code is
- * made subject to such option by the copyright holder.
- */
- package org.netbeans.core.windows;
- import java.lang.ref.Reference;
- import java.util.Iterator;
- import java.util.Set;
- import org.openide.windows.TopComponent;
- import org.openide.windows.WindowManager;
- import java.beans.PropertyChangeEvent;
- import java.beans.PropertyChangeListener;
- import java.lang.ref.WeakReference;
- import java.util.ArrayList;
- import java.util.List;
- /**
- * Instance of this class keeps list of (weak references to) recently activated TopComponents.
- *
- * @author Marek Slama
- */
- final class RecentViewList implements PropertyChangeListener {
- private static RecentViewList instance;
-
- /** List of TopComponents (weak references are used). First is most recently
- * activated. */
- private List<Reference<TopComponent>> tcWeakList = new ArrayList<Reference<TopComponent>>(20);
-
- public RecentViewList (WindowManager wm) {
- // Starts listening on Registry to be notified about activated TopComponent.
- wm.getRegistry().addPropertyChangeListener(this);
- }
-
- /** Used to get array for view and for persistence */
- public TopComponent [] getTopComponents() {
- List<TopComponent> tcList = new ArrayList<TopComponent>(tcWeakList.size());
- clean();
- for (int i = 0; i < tcWeakList.size(); i++) {
- Reference<TopComponent> w = tcWeakList.get(i);
- TopComponent tc = w.get();
- if ((tc != null) && tc.isOpened()) {
- tcList.add(tc);
- }
- }
- return tcList.toArray(new TopComponent[tcList.size()]);
- }
-
- /** Used to set initial values from persistence */
- public void setTopComponents(TopComponent [] tcs) {
- tcWeakList.clear();
- for (int i = 0; i < tcs.length; i++) {
- Reference<TopComponent> wr = new WeakReference<TopComponent>(tcs[i]);
- tcWeakList.add(wr);
- }
- }
-
- public void propertyChange(PropertyChangeEvent evt) {
- if (TopComponent.Registry.PROP_ACTIVATED.equals(evt.getPropertyName())) {
- TopComponent tc = (TopComponent) evt.getNewValue();
- if (tc != null) {
- //Update list
- clean();
- Reference<TopComponent> w = find(tc);
- if (w != null) {
- //Rearrange, put to first place
- tcWeakList.remove(w);
- tcWeakList.add(0,w);
- } else {
- Reference<TopComponent> wr = new WeakReference<TopComponent>(tc);
- tcWeakList.add(0,wr);
- }
- // #69486: ensure all components are listed
- fillList(TopComponent.getRegistry().getOpened());
- }
- }
- }
-
- /** Clean gc'ed TopComponents from list */
- private void clean () {
- int i = 0;
- while (i < tcWeakList.size()) {
- WeakReference w = (WeakReference) tcWeakList.get(i);
- TopComponent tc = (TopComponent) w.get();
- //TopComponent was gc'ed
- if (tc == null) {
- tcWeakList.remove(w);
- } else {
- i++;
- }
- }
- }
-
- /** Returns weak reference to given TopComponent if present.
- * Otherwise returns null. */
- private Reference<TopComponent> find (TopComponent tc) {
- for (int i = 0; i < tcWeakList.size(); i++) {
- Reference<TopComponent> w = tcWeakList.get(i);
- TopComponent c = w.get();
- if (tc == c) {
- return w;
- }
- }
- return null;
- }
- /** Fills list of weak references with TCs that are in given
- * input list but are not yet contained in list of weak references.
- */
- private void fillList(Set<TopComponent> openedTCs) {
- Reference<TopComponent> wr;
- for (TopComponent curTC: openedTCs) {
- if (find(curTC) == null) {
- if (tcWeakList.size() > 1) {
- wr = new WeakReference<TopComponent>(curTC);
- tcWeakList.add(1,wr);
- } else {
- wr = new WeakReference<TopComponent>(curTC);
- tcWeakList.add(wr);
- }
- }
- }
- }
-
- }