Source Code Cross Referenced for CookieSetLkp.java in  » IDE-Netbeans » openide » org » openide » nodes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » openide » org.openide.nodes 
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.openide.nodes;
042:
043:        import java.util.Collections;
044:        import java.util.HashMap;
045:        import java.util.HashSet;
046:        import java.util.Iterator;
047:        import java.util.concurrent.ConcurrentHashMap;
048:        import org.openide.util.lookup.AbstractLookup;
049:        import org.openide.util.lookup.AbstractLookup.Pair;
050:
051:        import java.lang.ref.WeakReference;
052:        import java.util.ArrayList;
053:        import java.util.List;
054:        import java.util.Map;
055:        import java.util.Set;
056:        import org.openide.util.Lookup;
057:        import org.openide.util.lookup.InstanceContent;
058:
059:        /** Content for a cookie set.
060:         */
061:        final class CookieSetLkp extends AbstractLookup {
062:            private final CookieSet.Before before;
063:
064:            public CookieSetLkp(CookieSet.Before b) {
065:                this .before = b;
066:            }
067:
068:            public void add(Object obj) {
069:                addPair(new SimpleItem<Object>(obj));
070:            }
071:
072:            public final <T, R> void add(T inst,
073:                    InstanceContent.Convertor<T, R> conv) {
074:                addPair(new ConvertingItem<T, R>(inst, conv));
075:            }
076:
077:            public void remove(Object obj) {
078:                removePair(new SimpleItem<Object>(obj));
079:            }
080:
081:            public final <T, R> void remove(T inst,
082:                    InstanceContent.Convertor<T, R> conv) {
083:                removePair(new ConvertingItem<T, R>(inst, conv));
084:            }
085:
086:            void super RemovePair(Pair pair) {
087:                removePair(pair);
088:            }
089:
090:            private ThreadLocal<Object> isInReplaceInst = new ThreadLocal<Object>();
091:
092:            <T> void replaceInstances(Class<? extends T> clazz, T[] instances,
093:                    CookieSet set) {
094:                Iterator<? extends Lookup.Item> it;
095:                Set<Lookup.Item> toRemove;
096:                List<AbstractLookup.Pair> pairs;
097:
098:                Object prev = isInReplaceInst.get();
099:                try {
100:                    isInReplaceInst.set(this );
101:
102:                    it = lookupResult(Object.class).allItems().iterator();
103:                    toRemove = new HashSet<Lookup.Item>(lookupResult(clazz)
104:                            .allItems());
105:                    pairs = new ArrayList<AbstractLookup.Pair>();
106:
107:                    boolean change = false;
108:                    int index = 0;
109:                    while (it.hasNext()) {
110:                        Lookup.Item item = it.next();
111:                        assert item instanceof  AbstractLookup.Pair;
112:
113:                        if (toRemove.remove(item)) {
114:                            if (index < instances.length) {
115:                                if (item instanceof  SimpleItem) {
116:                                    SimpleItem<?> simple = (SimpleItem<?>) item;
117:                                    if (simple.obj == instances[index]) {
118:                                        index++;
119:                                        pairs.add(simple);
120:                                        continue;
121:                                    }
122:                                }
123:
124:                                change = true;
125:                                pairs
126:                                        .add(new SimpleItem<T>(
127:                                                instances[index++]));
128:                            } else {
129:                                change = true;
130:                            }
131:                        } else {
132:                            pairs.add((AbstractLookup.Pair) item);
133:                        }
134:                    }
135:                    assert toRemove.isEmpty();
136:
137:                    while (index < instances.length) {
138:                        change = true;
139:                        pairs.add(new SimpleItem<T>(instances[index++]));
140:                    }
141:
142:                    if (change) {
143:                        setPairs(pairs);
144:                        set.fireChangeEvent();
145:                    }
146:                } finally {
147:                    isInReplaceInst.set(prev);
148:                }
149:            }
150:
151:            protected void beforeLookup(Lookup.Template<?> template) {
152:                beforeLookupImpl(template.getType());
153:            }
154:
155:            final void beforeLookupImpl(Class<?> clazz) {
156:                if (before != null && isInReplaceInst.get() == null) {
157:                    before.beforeLookup(clazz);
158:                }
159:            }
160:
161:            /** Instance of one item representing an object.
162:             */
163:            final static class SimpleItem<T> extends Pair<T> {
164:                private T obj;
165:
166:                /** Create an item.
167:                 * @obj object to register
168:                 */
169:                public SimpleItem(T obj) {
170:                    if (obj == null) {
171:                        throw new NullPointerException();
172:                    }
173:                    this .obj = obj;
174:                }
175:
176:                /** Tests whether this item can produce object
177:                 * of class c.
178:                 */
179:                public boolean instanceOf(Class<?> c) {
180:                    return c.isInstance(obj);
181:                }
182:
183:                /** Get instance of registered object. If convertor is specified then
184:                 *  method InstanceLookup.Convertor.convertor is used and weak reference
185:                 * to converted object is saved.
186:                 * @return the instance of the object.
187:                 */
188:                public T getInstance() {
189:                    return obj;
190:                }
191:
192:                public boolean equals(Object o) {
193:                    if (o instanceof  SimpleItem) {
194:                        return obj.equals(((SimpleItem) o).obj);
195:                    } else {
196:                        return false;
197:                    }
198:                }
199:
200:                public int hashCode() {
201:                    return obj.hashCode();
202:                }
203:
204:                /** An identity of the item.
205:                 * @return string representing the item, that can be used for
206:                 *   persistance purposes to locate the same item next time
207:                 */
208:                public String getId() {
209:                    return "IL[" + obj.toString(); // NOI18N
210:                }
211:
212:                /** Getter for display name of the item.
213:                 */
214:                public String getDisplayName() {
215:                    return obj.toString();
216:                }
217:
218:                /** Method that can test whether an instance of a class has been created
219:                 * by this item.
220:                 *
221:                 * @param obj the instance
222:                 * @return if the item has already create an instance and it is the same
223:                 *  as obj.
224:                 */
225:                protected boolean creatorOf(Object obj) {
226:                    return obj == this .obj;
227:                }
228:
229:                /** The class of this item.
230:                 * @return the correct class
231:                 */
232:                @SuppressWarnings("unchecked")
233:                public Class<? extends T> getType() {
234:                    return (Class<? extends T>) obj.getClass();
235:                }
236:            } // end of SimpleItem
237:
238:            /** Instance of one item registered in the map.
239:             */
240:            final static class ConvertingItem<T, R> extends Pair<R> {
241:                /** registered object */
242:                private T obj;
243:
244:                /** Reference to converted object. */
245:                private WeakReference<R> ref;
246:
247:                /** convertor to use */
248:                private InstanceContent.Convertor<? super  T, R> conv;
249:
250:                /** Create an item.
251:                 * @obj object to register
252:                 * @conv a convertor, can be <code>null</code>.
253:                 */
254:                public ConvertingItem(T obj,
255:                        InstanceContent.Convertor<? super  T, R> conv) {
256:                    this .obj = obj;
257:                    this .conv = conv;
258:                }
259:
260:                /** Tests whether this item can produce object
261:                 * of class c.
262:                 */
263:                public boolean instanceOf(Class<?> c) {
264:                    return c.isAssignableFrom(getType());
265:                }
266:
267:                /** Returns converted object or null if obj has not been converted yet
268:                 * or reference was cleared by garbage collector.
269:                 */
270:                private R getConverted() {
271:                    if (ref == null) {
272:                        return null;
273:                    }
274:
275:                    return ref.get();
276:                }
277:
278:                /** Get instance of registered object. If convertor is specified then
279:                 *  method InstanceLookup.Convertor.convertor is used and weak reference
280:                 * to converted object is saved.
281:                 * @return the instance of the object.
282:                 */
283:                public synchronized R getInstance() {
284:                    R converted = getConverted();
285:
286:                    if (converted == null) {
287:                        converted = conv.convert(obj);
288:                        ref = new WeakReference<R>(converted);
289:                    }
290:
291:                    return converted;
292:                }
293:
294:                public boolean equals(Object o) {
295:                    if (o instanceof  ConvertingItem) {
296:                        return obj.equals(((ConvertingItem) o).obj);
297:                    } else {
298:                        return false;
299:                    }
300:                }
301:
302:                public int hashCode() {
303:                    return obj.hashCode();
304:                }
305:
306:                /** An identity of the item.
307:                 * @return string representing the item, that can be used for
308:                 *   persistance purposes to locate the same item next time
309:                 */
310:                public String getId() {
311:                    return conv.id(obj);
312:                }
313:
314:                /** Getter for display name of the item.
315:                 */
316:                public String getDisplayName() {
317:                    return conv.displayName(obj);
318:                }
319:
320:                /** Method that can test whether an instance of a class has been created
321:                 * by this item.
322:                 *
323:                 * @param obj the instance
324:                 * @return if the item has already create an instance and it is the same
325:                 *  as obj.
326:                 */
327:                protected boolean creatorOf(Object obj) {
328:                    if (conv == null) {
329:                        return obj == this .obj;
330:                    } else {
331:                        return obj == getConverted();
332:                    }
333:                }
334:
335:                /** The class of this item.
336:                 * @return the correct class
337:                 */
338:                @SuppressWarnings("unchecked")
339:                public Class<? extends R> getType() {
340:                    R converted = getConverted();
341:
342:                    if (converted == null) {
343:                        return conv.type(obj);
344:                    }
345:
346:                    return (Class<? extends R>) converted.getClass();
347:                }
348:            } // end of ConvertingItem
349:        }
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