Source Code Cross Referenced for ActiveDocumentSupport.java in  » IDE-Netbeans » vmd.analyzer » org » netbeans » modules » vmd » api » model » common » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » vmd.analyzer » org.netbeans.modules.vmd.api.model.common 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.vmd.api.model.common;
042:
043:        import org.netbeans.modules.vmd.api.model.*;
044:        import org.openide.util.WeakSet;
045:
046:        import java.util.Collection;
047:        import java.util.Collections;
048:
049:        /**
050:         * This class allows to register a listener on active document and components in whole environment.
051:         * Usually used by active-document-aware components like inspector, palette, ...
052:         *
053:         * @author David Kaspar
054:         */
055:        public final class ActiveDocumentSupport {
056:
057:            private static final DesignEventFilter FILTER_SELECTION = new DesignEventFilter()
058:                    .setSelection(true);
059:
060:            private static final ActiveDocumentSupport support = new ActiveDocumentSupport();
061:
062:            private final WeakSet<Listener> listeners = new WeakSet<Listener>();
063:
064:            private DesignDocument activeDocument = null;
065:            private DesignListener selectionListener = null;
066:            private Collection<DesignComponent> activeComponents = Collections
067:                    .emptySet(); // WARNING - possible memory leak
068:
069:            private ActiveDocumentSupport() {
070:            }
071:
072:            /**
073:             * Returns a default instance of the ActiveViewSupport.
074:             * @return the default ActiveViewSupport
075:             */
076:            public static ActiveDocumentSupport getDefault() {
077:                return support;
078:            }
079:
080:            /**
081:             * Registers an active-document listener.
082:             * @param listener the listener
083:             */
084:            public void addActiveDocumentListener(Listener listener) {
085:                synchronized (listeners) {
086:                    listeners.add(listener);
087:                }
088:            }
089:
090:            /**
091:             * Unregisters an active-document listener.
092:             * @param listener the listener
093:             */
094:            public void removeActiveDocumentListener(Listener listener) {
095:                synchronized (listeners) {
096:                    listeners.remove(listener);
097:                }
098:            }
099:
100:            /**
101:             * Returns an active document in whole environment.
102:             * @return the active document
103:             */
104:            public DesignDocument getActiveDocument() {
105:                return activeDocument;
106:            }
107:
108:            /**
109:             * returns active components in whole environment.
110:             * @return the active components
111:             */
112:            public Collection<DesignComponent> getActiveComponents() {
113:                return activeComponents;
114:            }
115:
116:            private void fireActiveDocumentChanged(
117:                    DesignDocument deactivatedDocument,
118:                    final DesignDocument activatedDocument) {
119:                Listener[] Listeners;
120:                synchronized (listeners) {
121:                    Listeners = listeners
122:                            .toArray(new Listener[listeners.size()]);
123:                }
124:                for (Listener listener : Listeners) {
125:                    if (listener != null)
126:                        listener.activeDocumentChanged(deactivatedDocument,
127:                                activatedDocument);
128:                }
129:
130:                if (deactivatedDocument != activatedDocument) {
131:                    if (deactivatedDocument != null) {
132:                        if (selectionListener == null)
133:                            Debug
134:                                    .warning("SelectionListener does not exist but it should"); // NOI18N
135:                        else
136:                            deactivatedDocument.getListenerManager()
137:                                    .removeDesignListener(selectionListener);
138:                    }
139:                    if (activatedDocument != null) {
140:                        activatedDocument.getTransactionManager().readAccess(
141:                                new Runnable() {
142:                                    public void run() {
143:                                        activatedDocument
144:                                                .getListenerManager()
145:                                                .addDesignListener(
146:                                                        selectionListener = new SelectionDesignListener(
147:                                                                activatedDocument),
148:                                                        FILTER_SELECTION);
149:                                        fireActiveComponentsChanged(activatedDocument
150:                                                .getSelectedComponents());
151:                                    }
152:                                });
153:                    } else {
154:                        fireActiveComponentsChanged(Collections
155:                                .<DesignComponent> emptyList());
156:                    }
157:                }
158:            }
159:
160:            private void fireActiveComponentsChanged(
161:                    Collection<DesignComponent> activeComponents) {
162:                this .activeComponents = activeComponents;
163:
164:                Listener[] Listeners;
165:                synchronized (listeners) {
166:                    Listeners = listeners
167:                            .toArray(new Listener[listeners.size()]);
168:                }
169:                for (Listener listener : Listeners) {
170:                    if (listener != null)
171:                        listener.activeComponentsChanged(activeComponents);
172:                }
173:            }
174:
175:            /**
176:             * Sets an active document for whole environment. This method is used from ActiveViewSupport.
177:             * Do not call it unless you know what it really does.
178:             * @param designDocument the newly active document
179:             */
180:            public void setActiveDocument(DesignDocument designDocument) {
181:                if (activeDocument == designDocument)
182:                    return;
183:                DesignDocument lastDocument = activeDocument;
184:                activeDocument = designDocument;
185:                fireActiveDocumentChanged(lastDocument, activeDocument);
186:            }
187:
188:            private class SelectionDesignListener implements  DesignListener {
189:
190:                private DesignDocument document;
191:
192:                public SelectionDesignListener(DesignDocument document) {
193:                    this .document = document;
194:                }
195:
196:                public void designChanged(DesignEvent event) {
197:                    fireActiveComponentsChanged(document
198:                            .getSelectedComponents());
199:                }
200:            }
201:
202:            /**
203:             * Used for notification of an active document in the whole environment.
204:             * Usually used by active-document-aware components like inspector, palette, ...
205:             * The listener could be registered using ActiveDocumentSupport class.
206:             */
207:            public interface Listener {
208:
209:                /**
210:                 * Called when a reference to an active document is changed.
211:                 * Called before activeComponentsChanged method.
212:                 * @param deactivatedDocument the deactivated document; null if there was no active document before.
213:                 * @param activatedDocument   the activated document; null if there is no active document now.
214:                 */
215:                void activeDocumentChanged(DesignDocument deactivatedDocument,
216:                        DesignDocument activatedDocument);
217:
218:                /**
219:                 * Called when a collection of active components is changed.
220:                 * Called after activeDocumentChanged methods.
221:                 * @param activeComponents the collection of active components
222:                 */
223:                void activeComponentsChanged(
224:                        Collection<DesignComponent> activeComponents);
225:
226:            }
227:
228:        }
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