Source Code Cross Referenced for Lookup.java in  » IDE-Netbeans » ant » org » netbeans » api » debugger » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » ant » org.netbeans.api.debugger 
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:
042:        package org.netbeans.api.debugger;
043:
044:        import java.beans.Customizer;
045:        import java.beans.PropertyChangeEvent;
046:        import java.beans.PropertyChangeListener;
047:        import java.io.BufferedReader;
048:        import java.io.IOException;
049:        import java.io.InputStream;
050:        import java.io.InputStreamReader;
051:        import java.lang.reflect.Constructor;
052:        import java.lang.reflect.InvocationTargetException;
053:        import java.lang.reflect.Method;
054:        import java.net.URL;
055:        import java.util.ArrayList;
056:        import java.util.Collection;
057:        import java.util.Collections;
058:        import java.util.Comparator;
059:        import java.util.Enumeration;
060:        import java.util.HashMap;
061:        import java.util.HashSet;
062:        import java.util.Iterator;
063:        import java.util.LinkedHashMap;
064:        import java.util.List;
065:        import java.util.Map;
066:        import java.util.Set;
067:
068:        import java.util.logging.Level;
069:        import java.util.logging.Logger;
070:        import org.netbeans.spi.debugger.ContextProvider;
071:        import org.openide.ErrorManager;
072:        import org.openide.modules.ModuleInfo;
073:        import org.openide.util.LookupEvent;
074:        import org.openide.util.RequestProcessor;
075:        import org.openide.util.WeakListeners;
076:        import org.openide.util.WeakSet;
077:
078:        /**
079:         * Lookup implementation, which provides services in a list.
080:         * The list can refresh itself when the services change.
081:         * The refreshing is performed under a lock on the list object so that
082:         * clients have consistent data under synchronization on the list instance.
083:         *
084:         * @author   Jan Jancura, Martin Entlicher
085:         */
086:        abstract class Lookup implements  ContextProvider {
087:
088:            public static final String NOTIFY_LOAD_FIRST = "load first";
089:            public static final String NOTIFY_LOAD_LAST = "load last";
090:            public static final String NOTIFY_UNLOAD_FIRST = "unload first";
091:            public static final String NOTIFY_UNLOAD_LAST = "unload last";
092:
093:            public <T> T lookupFirst(String folder, Class<T> service) {
094:                List<? extends T> l = lookup(folder, service);
095:                synchronized (l) {
096:                    if (l.isEmpty())
097:                        return null;
098:                    return l.get(0);
099:                }
100:            }
101:
102:            public abstract <T> List<? extends T> lookup(String folder,
103:                    Class<T> service);
104:
105:            private static boolean verbose = System
106:                    .getProperty("netbeans.debugger.registration") != null;
107:
108:            static class Instance extends Lookup {
109:                private Object[] services;
110:
111:                Instance(Object[] services) {
112:                    this .services = services;
113:                }
114:
115:                public <T> List<? extends T> lookup(String folder,
116:                        Class<T> service) {
117:                    List<T> l = new ArrayList<T>();
118:                    for (Object s : services) {
119:                        if (service.isInstance(s)) {
120:                            l.add(service.cast(s));
121:                            if (verbose)
122:                                System.out.println("\nR  instance " + s
123:                                        + " found");
124:                        }
125:                    }
126:                    return l;
127:                }
128:            }
129:
130:            static class Compound extends Lookup {
131:                private ContextProvider l1;
132:                private ContextProvider l2;
133:
134:                Compound(ContextProvider l1, ContextProvider l2) {
135:                    this .l1 = l1;
136:                    this .l2 = l2;
137:                    setContext(this );
138:                }
139:
140:                public <T> List<? extends T> lookup(String folder,
141:                        Class<T> service) {
142:                    return new CompoundLookupList<T>(folder, service);
143:                }
144:
145:                void setContext(Lookup context) {
146:                    if (l1 instanceof  Compound)
147:                        ((Compound) l1).setContext(context);
148:                    if (l1 instanceof  MetaInf)
149:                        ((MetaInf) l1).setContext(context);
150:                    if (l2 instanceof  Compound)
151:                        ((Compound) l2).setContext(context);
152:                    if (l2 instanceof  MetaInf)
153:                        ((MetaInf) l2).setContext(context);
154:                }
155:
156:                private class CompoundLookupList<T> extends LookupList<T>
157:                        implements  Customizer, PropertyChangeListener {
158:
159:                    private String folder;
160:                    private Class<T> service;
161:                    private List<PropertyChangeListener> propertyChangeListeners;
162:                    private Customizer sublist1, sublist2;
163:
164:                    public CompoundLookupList(String folder, Class<T> service) {
165:                        super (null);
166:                        this .folder = folder;
167:                        this .service = service;
168:                        setUp();
169:                    }
170:
171:                    private synchronized void setUp() {
172:                        clear();
173:                        List<? extends T> list1 = l1.lookup(folder, service);
174:                        List<? extends T> list2 = l2.lookup(folder, service);
175:                        addAll(list1);
176:                        addAll(list2);
177:                        sublist1 = (list1 instanceof  Customizer) ? (Customizer) list1
178:                                : null;
179:                        sublist2 = (list2 instanceof  Customizer) ? (Customizer) list2
180:                                : null;
181:                    }
182:
183:                    public synchronized void setObject(Object bean) {
184:                        if (sublist1 != null)
185:                            sublist1.setObject(bean);
186:                        if (sublist2 != null)
187:                            sublist2.setObject(bean);
188:                    }
189:
190:                    public synchronized void addPropertyChangeListener(
191:                            PropertyChangeListener listener) {
192:                        if (propertyChangeListeners == null) {
193:                            propertyChangeListeners = new ArrayList<PropertyChangeListener>();
194:                            if (sublist1 != null)
195:                                sublist1.addPropertyChangeListener(this );
196:                            if (sublist2 != null)
197:                                sublist2.addPropertyChangeListener(this );
198:                        }
199:                        propertyChangeListeners.add(listener);
200:                    }
201:
202:                    public synchronized void removePropertyChangeListener(
203:                            PropertyChangeListener listener) {
204:                        propertyChangeListeners.remove(listener);
205:                    }
206:
207:                    public void propertyChange(PropertyChangeEvent e) {
208:                        setUp();
209:                        List<PropertyChangeListener> listeners;
210:                        synchronized (this ) {
211:                            if (propertyChangeListeners == null) {
212:                                return;
213:                            }
214:                            listeners = new ArrayList<PropertyChangeListener>(
215:                                    propertyChangeListeners);
216:                        }
217:                        PropertyChangeEvent evt = new PropertyChangeEvent(this ,
218:                                "content", null, null);
219:                        for (PropertyChangeListener l : listeners) {
220:                            l.propertyChange(evt);
221:                        }
222:                    }
223:                }
224:            }
225:
226:            static class MetaInf extends Lookup {
227:
228:                private static final String HIDDEN = "-hidden"; // NOI18N
229:
230:                private String rootFolder;
231:                private Map<String, List<String>> registrationCache = new HashMap<String, List<String>>();
232:                private HashMap<String, Object> instanceCache = new HashMap<String, Object>();
233:                private Lookup context;
234:                private org.openide.util.Lookup.Result<ModuleInfo> moduleLookupResult;
235:                private ModuleChangeListener modulesChangeListener;
236:                private Map<ClassLoader, ModuleChangeListener> moduleChangeListeners = new HashMap<ClassLoader, ModuleChangeListener>();
237:                private Map<ModuleInfo, ModuleChangeListener> disabledModuleChangeListeners = new HashMap<ModuleInfo, ModuleChangeListener>();
238:                private Set<MetaInfLookupList> lookupLists = new WeakSet<MetaInfLookupList>();
239:
240:                MetaInf(String rootFolder) {
241:                    this .rootFolder = rootFolder;
242:                    moduleLookupResult = org.openide.util.Lookup.getDefault()
243:                            .lookupResult(ModuleInfo.class);
244:                    //System.err.println("\nModules = "+moduleLookupResult.allInstances().size()+"\n");
245:                    modulesChangeListener = new ModuleChangeListener(null);
246:                    moduleLookupResult.addLookupListener(WeakListeners.create(
247:                            org.openide.util.LookupListener.class,
248:                            modulesChangeListener, moduleLookupResult));
249:                }
250:
251:                void setContext(Lookup context) {
252:                    this .context = context;
253:                }
254:
255:                public <T> List<? extends T> lookup(String folder,
256:                        Class<T> service) {
257:                    MetaInfLookupList<T> mll = new MetaInfLookupList<T>(folder,
258:                            service);
259:                    synchronized (lookupLists) {
260:                        lookupLists.add(mll);
261:                    }
262:                    return mll;
263:                }
264:
265:                private List<String> list(String folder, Class<?> service) {
266:                    String name = service.getName();
267:                    String resourceName = "META-INF/debugger/"
268:                            + ((rootFolder == null) ? "" : rootFolder + "/")
269:                            + ((folder == null) ? "" : folder + "/") + name;
270:                    synchronized (registrationCache) {
271:                        List<String> l = registrationCache.get(resourceName);
272:                        if (l == null) {
273:                            l = loadMetaInf(resourceName);
274:                            registrationCache.put(resourceName, l);
275:                        }
276:                        return l;
277:                    }
278:                }
279:
280:                private static Set<String> getHiddenClassNames(List l) {
281:                    Set<String> s = null;
282:                    int i, k = l.size();
283:                    for (i = 0; i < k; i++) {
284:                        String className = (String) l.get(i);
285:                        if (className.endsWith(HIDDEN)) {
286:                            if (s == null) {
287:                                s = new HashSet<String>();
288:                            }
289:                            s.add(className.substring(0, className.length()
290:                                    - HIDDEN.length()));
291:                        }
292:                    }
293:                    return s;
294:                }
295:
296:                /**
297:                 * Loads instances of given class from META-INF/debugger from given
298:                 * folder. Given context isused as the parameter to constructor.
299:                 */
300:                private List<String> loadMetaInf(String resourceName) {
301:                    List<String> l = new ArrayList<String>();
302:                    try {
303:                        ClassLoader cl = org.openide.util.Lookup.getDefault()
304:                                .lookup(ClassLoader.class);
305:                        String v = "\nR lookup " + resourceName;
306:                        Enumeration<URL> e = cl.getResources(resourceName);
307:                        Set<URL> urls = new HashSet<URL>();
308:                        while (e.hasMoreElements()) {
309:                            URL url = e.nextElement();
310:                            // Ignore duplicated URLs, necessary because of tests
311:                            if (urls.contains(url))
312:                                continue;
313:                            urls.add(url);
314:                            InputStream is = url.openStream();
315:                            if (is == null)
316:                                continue;
317:                            BufferedReader br = new BufferedReader(
318:                                    new InputStreamReader(is));
319:                            for (String s = br.readLine(); s != null; s = br
320:                                    .readLine()) {
321:                                if (s.startsWith("#"))
322:                                    continue;
323:                                if (s.length() == 0)
324:                                    continue;
325:                                if (verbose)
326:                                    v += "\nR  service " + s + " found";
327:
328:                                l.add(s);
329:                            }
330:                        }
331:                        if (verbose)
332:                            System.out.println(v);
333:                        return l;
334:                    } catch (IOException e) {
335:                        e.printStackTrace();
336:                    }
337:                    throw new InternalError("Can not read from Meta-inf!");
338:                }
339:
340:                private Object createInstance(String service) {
341:                    try {
342:                        ClassLoader cl = org.openide.util.Lookup.getDefault()
343:                                .lookup(ClassLoader.class);
344:                        String method = null;
345:                        if (service.endsWith("()")) {
346:                            int lastdot = service.lastIndexOf('.');
347:                            if (lastdot < 0) {
348:                                ErrorManager.getDefault().log(
349:                                        "Bad service - dot before method name is missing: "
350:                                                + "'" + service + "'.");
351:                                return null;
352:                            }
353:                            method = service.substring(lastdot + 1,
354:                                    service.length() - 2).trim();
355:                            service = service.substring(0, lastdot);
356:                        }
357:                        Class cls = cl.loadClass(service);
358:
359:                        Object o = null;
360:                        if (method != null) {
361:                            Method m = null;
362:                            if (context != null) {
363:                                try {
364:                                    m = cls.getDeclaredMethod(method,
365:                                            new Class[] { Lookup.class });
366:                                } catch (NoSuchMethodException nsmex) {
367:                                }
368:                            }
369:                            if (m == null) {
370:                                try {
371:                                    m = cls.getDeclaredMethod(method,
372:                                            new Class[] {});
373:                                } catch (NoSuchMethodException nsmex) {
374:                                }
375:                            }
376:                            if (m != null) {
377:                                o = m
378:                                        .invoke(
379:                                                null,
380:                                                (m.getParameterTypes().length == 0) ? new Object[] {}
381:                                                        : new Object[] { context });
382:                            }
383:                        }
384:                        if (o == null && context != null) {
385:                            Constructor[] cs = cls.getConstructors();
386:                            int i, k = cs.length;
387:                            for (i = 0; i < k; i++) {
388:                                Constructor c = cs[i];
389:                                if (c.getParameterTypes().length != 1)
390:                                    continue;
391:                                try {
392:                                    o = c.newInstance(new Object[] { context });
393:                                } catch (IllegalAccessException e) {
394:                                    if (verbose) {
395:                                        System.out.println("\nservice: "
396:                                                + service);
397:                                        e.printStackTrace();
398:                                    }
399:                                } catch (IllegalArgumentException e) {
400:                                    if (verbose) {
401:                                        System.out.println("\nservice: "
402:                                                + service);
403:                                        e.printStackTrace();
404:                                    }
405:                                }
406:                            }
407:                        }
408:                        if (o == null)
409:                            o = cls.newInstance();
410:                        if (verbose)
411:                            System.out.println("\nR  instance " + o
412:                                    + " created");
413:                        return o;
414:                    } catch (ClassNotFoundException e) {
415:                        ErrorManager.getDefault().notify(
416:                                ErrorManager.getDefault().annotate(
417:                                        e,
418:                                        "The service " + service
419:                                                + " is not found."));
420:                    } catch (InstantiationException e) {
421:                        ErrorManager.getDefault().notify(
422:                                ErrorManager.getDefault().annotate(
423:                                        e,
424:                                        "The service " + service
425:                                                + " can not be instantiated."));
426:                    } catch (IllegalAccessException e) {
427:                        ErrorManager.getDefault().notify(
428:                                ErrorManager.getDefault().annotate(
429:                                        e,
430:                                        "The service " + service
431:                                                + " can not be accessed."));
432:                    } catch (InvocationTargetException ex) {
433:                        ErrorManager.getDefault().notify(
434:                                ErrorManager.getDefault().annotate(
435:                                        ex,
436:                                        "The service " + service
437:                                                + " can not be created."));
438:                    } catch (ExceptionInInitializerError ex) {
439:                        ErrorManager.getDefault().notify(
440:                                ErrorManager.getDefault().annotate(
441:                                        ex,
442:                                        "The service " + service
443:                                                + " can not be initialized."));
444:                    }
445:                    return null;
446:                }
447:
448:                private void listenOn(ClassLoader cl) {
449:                    synchronized (moduleChangeListeners) {
450:                        if (!moduleChangeListeners.containsKey(cl)) {
451:                            for (ModuleInfo mi : moduleLookupResult
452:                                    .allInstances()) {
453:                                if (mi.isEnabled() && mi.getClassLoader() == cl) {
454:                                    ModuleChangeListener l = new ModuleChangeListener(
455:                                            cl);
456:                                    mi.addPropertyChangeListener(WeakListeners
457:                                            .propertyChange(l, mi));
458:                                    moduleChangeListeners.put(cl, l);
459:                                }
460:                            }
461:                        }
462:                    }
463:                }
464:
465:                private void listenOnDisabledModules() {
466:                    synchronized (moduleChangeListeners) {
467:                        for (ModuleInfo mi : moduleLookupResult.allInstances()) {
468:                            if (!mi.isEnabled()
469:                                    && !disabledModuleChangeListeners
470:                                            .containsKey(mi)) {
471:                                ModuleChangeListener l = new ModuleChangeListener(
472:                                        null);
473:                                mi.addPropertyChangeListener(WeakListeners
474:                                        .propertyChange(l, mi));
475:                                disabledModuleChangeListeners.put(mi, l);
476:                            }
477:                        }
478:                    }
479:                }
480:
481:                private final class ModuleChangeListener implements 
482:                        PropertyChangeListener, org.openide.util.LookupListener {
483:
484:                    private ClassLoader cl;
485:                    private RequestProcessor.Task refreshListEnabled;
486:                    private RequestProcessor.Task refreshListDisabled;
487:                    private RequestProcessor rp;
488:
489:                    public ModuleChangeListener(ClassLoader cl) {
490:                        this .cl = cl;
491:                    }
492:
493:                    // Some module enabled or disabled
494:                    public void propertyChange(PropertyChangeEvent evt) {
495:                        //System.err.println("ModuleChangeListener.propertyChange("+evt+")");
496:                        //System.err.println("  getPropertyName = "+evt.getPropertyName()+", source = "+evt.getSource());
497:                        if (!ModuleInfo.PROP_ENABLED.equals(evt
498:                                .getPropertyName())) {
499:                            return;
500:                        }
501:                        clearCaches(cl);
502:                        ModuleInfo mi = (ModuleInfo) evt.getSource();
503:                        if (!mi.isEnabled() && cl != null) {
504:                            synchronized (moduleChangeListeners) {
505:                                moduleChangeListeners.remove(cl);
506:                                disabledModuleChangeListeners.put(mi, this );
507:                            }
508:                            cl = null;
509:                        } else if (mi.isEnabled()) {
510:                            cl = mi.getClassLoader();
511:                            synchronized (moduleChangeListeners) {
512:                                disabledModuleChangeListeners.remove(mi);
513:                                moduleChangeListeners.put(cl, this );
514:                            }
515:                        }
516:                        synchronized (this ) {
517:                            if (mi.isEnabled()) {
518:                                if (refreshListEnabled == null) {
519:                                    if (rp == null) {
520:                                        rp = new RequestProcessor(
521:                                                "Debugger Services Refresh", 1);
522:                                    }
523:                                    refreshListEnabled = rp
524:                                            .create(new Runnable() {
525:                                                public void run() {
526:                                                    refreshLists(true);
527:                                                }
528:                                            });
529:                                }
530:                                refreshListEnabled.schedule(100);
531:                            } else {
532:                                if (refreshListDisabled == null) {
533:                                    if (rp == null) {
534:                                        rp = new RequestProcessor(
535:                                                "Debugger Services Refresh", 1);
536:                                    }
537:                                    refreshListDisabled = rp
538:                                            .create(new Runnable() {
539:                                                public void run() {
540:                                                    refreshLists(false);
541:                                                }
542:                                            });
543:                                }
544:                                refreshListDisabled.schedule(100);
545:                            }
546:                        }
547:                        //refreshLists(mi.isEnabled());
548:                    }
549:
550:                    // Some new modules installed or old uninstalled
551:                    public void resultChanged(LookupEvent ev) {
552:                        clearCaches(null);
553:                        synchronized (moduleChangeListeners) {
554:                            moduleChangeListeners.clear();
555:                            disabledModuleChangeListeners.clear();
556:                        }
557:                        refreshLists(true);
558:                        listenOnDisabledModules();
559:                    }
560:
561:                    private void clearCaches(ClassLoader cl) {
562:                        //System.err.println("clearCaches("+cl+")");
563:                        synchronized (registrationCache) {
564:                            registrationCache.clear();
565:                        }
566:                        if (cl != null) {
567:                            // Release the appropriate instances from the instance cache
568:                            synchronized (instanceCache) {
569:                                List<String> classes = new ArrayList<String>(
570:                                        instanceCache.size());
571:                                classes.addAll(instanceCache.keySet());
572:                                for (String clazz : classes) {
573:                                    Object instance = instanceCache.get(clazz);
574:                                    if (instance.getClass().getClassLoader() == cl) {
575:                                        instanceCache.remove(clazz);
576:                                    }
577:                                }
578:                            }
579:                        }
580:                    }
581:
582:                    private void refreshLists(boolean load) {
583:                        List<MetaInfLookupList> ll;
584:                        synchronized (lookupLists) {
585:                            ll = new ArrayList<MetaInfLookupList>(lookupLists
586:                                    .size());
587:                            //System.err.println("\nRefreshing lookup lists ("+load+"):\n");
588:                            //System.err.println("  unsorted: "+lookupLists+"\n");
589:                            ll.addAll(lookupLists);
590:                        }
591:                        Collections.sort(ll,
592:                                getMetaInfLookupListComparator(load));
593:                        //System.err.println("    sorted: "+ll+"\n");
594:                        for (MetaInfLookupList mll : ll) {
595:                            mll.refreshContent();
596:                        }
597:                    }
598:
599:                }
600:
601:                public static Comparator<MetaInfLookupList> getMetaInfLookupListComparator(
602:                        final boolean load) {
603:                    return new Comparator<MetaInfLookupList>() {
604:                        public int compare(MetaInfLookupList l1,
605:                                MetaInfLookupList l2) {
606:                            if (load) {
607:                                return l1.notifyLoadOrder - l2.notifyLoadOrder;
608:                            } else {
609:                                return l1.notifyUnloadOrder
610:                                        - l2.notifyUnloadOrder;
611:                            }
612:                        }
613:                    };
614:                }
615:
616:                /**
617:                 * A special List implementation, which ensures that hidden elements
618:                 * are removed when adding items into the list.
619:                 * Also it can refresh itself when the services change.
620:                 * The refreshing is performed under a lock on this list object so that
621:                 * clients have consistent data under synchronization on this.
622:                 */
623:                private final class MetaInfLookupList<T> extends LookupList<T>
624:                        implements  Customizer {
625:
626:                    private String folder;
627:                    private final Class<T> service;
628:                    private List<PropertyChangeListener> propertyChangeListeners;
629:                    public int notifyLoadOrder = 0;
630:                    public int notifyUnloadOrder = 0;
631:
632:                    public MetaInfLookupList(String folder, Class<T> service) {
633:                        this (list(folder, service), service);
634:                        this .folder = folder;
635:                    }
636:
637:                    private MetaInfLookupList(List<String> l, Class<T> service) {
638:                        this (l, getHiddenClassNames(l), service);
639:                    }
640:
641:                    private MetaInfLookupList(List<String> l, Set<String> s,
642:                            Class<T> service) {
643:                        super (s);
644:                        assert service != null;
645:                        this .service = service;
646:                        fillInstances(l, s);
647:                        listenOnDisabledModules();
648:                    }
649:
650:                    private void fillInstances(List<String> l, Set<String> s) {
651:                        for (String className : l) {
652:                            if (className.endsWith(HIDDEN))
653:                                continue;
654:                            if (s != null && s.contains(className))
655:                                continue;
656:                            Object instance = null;
657:                            synchronized (instanceCache) {
658:                                instance = instanceCache.get(className);
659:                                if (instance == null) {
660:                                    instance = createInstance(className);
661:                                    instanceCache.put(className, instance);
662:                                }
663:                            }
664:                            if (instance != null) {
665:                                try {
666:                                    add(service.cast(instance), className);
667:                                } catch (ClassCastException cce) {
668:                                    Logger.getLogger(Lookup.class.getName())
669:                                            .log(Level.WARNING, null, cce);
670:                                }
671:                                listenOn(instance.getClass().getClassLoader());
672:                            }
673:                        }
674:                    }
675:
676:                    private synchronized void refreshContent() {
677:                        // Perform changes under a lock so that iterators reading this list
678:                        // can sync on it
679:                        clear();
680:                        List<String> l = list(folder, service);
681:                        Set<String> s = getHiddenClassNames(l);
682:                        hiddenClassNames = s;
683:                        fillInstances(l, s);
684:                        firePropertyChange();
685:                    }
686:
687:                    /* Grrrr can not be static here! :-(((
688:                    public static Comparator<MetaInfLookupList> getComparator(final boolean load) {
689:                        return new Comparator<MetaInfLookupList>() {
690:                            public int compare(MetaInfLookupList l1, MetaInfLookupList l2) {
691:                                if (load) {
692:                                    return l1.notifyLoadOrder - l2.notifyLoadOrder;
693:                                } else {
694:                                    return l1.notifyUnloadOrder - l2.notifyUnloadOrder;
695:                                }
696:                            }
697:                        };
698:                    }*/
699:
700:                    public void setObject(Object bean) {
701:                        if (NOTIFY_LOAD_FIRST == bean) {
702:                            notifyLoadOrder = -1;
703:                        } else if (NOTIFY_LOAD_LAST == bean) {
704:                            notifyLoadOrder = +1;
705:                        } else if (NOTIFY_UNLOAD_FIRST == bean) {
706:                            notifyUnloadOrder = -1;
707:                        } else if (NOTIFY_UNLOAD_LAST == bean) {
708:                            notifyUnloadOrder = +1;
709:                        } else {
710:                            throw new IllegalArgumentException(bean.toString());
711:                        }
712:                    }
713:
714:                    public synchronized void addPropertyChangeListener(
715:                            PropertyChangeListener listener) {
716:                        if (propertyChangeListeners == null) {
717:                            propertyChangeListeners = new ArrayList<PropertyChangeListener>();
718:                        }
719:                        propertyChangeListeners.add(listener);
720:                    }
721:
722:                    public synchronized void removePropertyChangeListener(
723:                            PropertyChangeListener listener) {
724:                        propertyChangeListeners.remove(listener);
725:                    }
726:
727:                    private void firePropertyChange() {
728:                        List<PropertyChangeListener> listeners;
729:                        synchronized (this ) {
730:                            if (propertyChangeListeners == null) {
731:                                return;
732:                            }
733:                            listeners = new ArrayList<PropertyChangeListener>(
734:                                    propertyChangeListeners);
735:                        }
736:                        PropertyChangeEvent evt = new PropertyChangeEvent(this ,
737:                                "content", null, null);
738:                        for (PropertyChangeListener l : listeners) {
739:                            l.propertyChange(evt);
740:                        }
741:                    }
742:
743:                }
744:            }
745:
746:            /**
747:             * A special List implementation, which ensures that hidden elements
748:             * are removed when adding items into the list.
749:             */
750:            private static class LookupList<T> extends ArrayList<T> {
751:
752:                protected Set<String> hiddenClassNames;
753:                private LinkedHashMap<T, String> instanceClassNames = new LinkedHashMap<T, String>();
754:
755:                public LookupList(Set<String> hiddenClassNames) {
756:                    this .hiddenClassNames = hiddenClassNames;
757:                }
758:
759:                void add(T instance, String className) {
760:                    super .add(instance);
761:                    instanceClassNames.put(instance, className);
762:                }
763:
764:                @Override
765:                public boolean addAll(Collection<? extends T> c) {
766:                    if (c instanceof  LookupList) {
767:                        @SuppressWarnings("unchecked")
768:                        // XXX possible to remove using more clever pattern with Class.cast
769:                        LookupList<? extends T> ll = (LookupList<? extends T>) c;
770:                        synchronized (ll) {
771:                            synchronized (this ) {
772:                                Set<String> newHiddenClassNames = ll.hiddenClassNames;
773:                                if (newHiddenClassNames != null) {
774:                                    //System.err.println("\nLookupList.addAll("+c+"), hiddenClassNames = "+hiddenClassNames+" + "+newHiddenClassNames);
775:                                    // Check the instances we have and remove the newly hidden ones:
776:                                    for (Iterator it = newHiddenClassNames
777:                                            .iterator(); it.hasNext();) {
778:                                        String className = (String) it.next();
779:                                        if (instanceClassNames
780:                                                .containsValue(className)) {
781:                                            for (Iterator ii = instanceClassNames
782:                                                    .keySet().iterator(); it
783:                                                    .hasNext();) {
784:                                                Object instance = ii.next();
785:                                                if (className
786:                                                        .equals(instanceClassNames
787:                                                                .get(instance))) {
788:                                                    remove(instance);
789:                                                    instanceClassNames
790:                                                            .remove(instance);
791:                                                    break;
792:                                                }
793:                                            }
794:                                        }
795:                                    }
796:                                    if (hiddenClassNames != null) {
797:                                        hiddenClassNames
798:                                                .addAll(newHiddenClassNames);
799:                                    } else {
800:                                        hiddenClassNames = newHiddenClassNames;
801:                                    }
802:                                }
803:                                ensureCapacity(size() + ll.size());
804:                                boolean addedAnything = false;
805:                                for (T instance : ll) {
806:                                    String className = ll.instanceClassNames
807:                                            .get(instance);
808:                                    if (hiddenClassNames == null
809:                                            || !hiddenClassNames
810:                                                    .contains(className)) {
811:                                        add(instance, className);
812:                                        addedAnything = true;
813:                                    }
814:                                }
815:                                return addedAnything;
816:                            }
817:                        }
818:                    } else {
819:                        return super .addAll(c);
820:                    }
821:                }
822:
823:                @Override
824:                public void clear() {
825:                    super.clear();
826:                    instanceClassNames.clear();
827:                }
828:
829:            }
830:
831:        }
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