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

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Java Source Code / Java Documentation » IDE Netbeans » openide » org.openide.loaders 
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.openide.loaders;
043:
044:        import java.util.*;
045:
046:        import org.openide.filesystems.FileObject;
047:
048:        /** This class is a lazy initialized set of FileObjects representing entries
049:         * in MultiDataObject class. Primary file object is returned as the first from
050:         * this set, the secondary fileobjects are sorted by <code>getNameExt()</code>
051:         * method result alphabetically.
052:         * <p>
053:         * This class is an implementation of performance enhancement #16396.
054:         *
055:         * @see <a href="http://www.netbeans.org/issues/show_bug.cgi?id=16396">Issue #16396</a>
056:         *
057:         * @author  Petr Hamernik
058:         */
059:        final class FilesSet implements  Set<FileObject> {
060:
061:            /** MDO which created this set */
062:            private final MultiDataObject mymdo;
063:
064:            /** A flag */
065:            private boolean lazyWorkDone;
066:
067:            /** Primary file. It is returned first. */
068:            private FileObject primaryFile;
069:
070:            /** The link to secondary variable of MultiDataObject. Reading of the content
071:             * must be synchronized on this map.
072:             */
073:            private Map<FileObject, MultiDataObject.Entry> secondary;
074:
075:            /** The set containing all files. It is <code>null</code> and is lazy initialized
076:             * when necessary.
077:             */
078:            private TreeSet<FileObject> delegate;
079:
080:            /** Creates a new instance of FilesSet for the MultiDataObject.
081:             * @param primaryFile The primary file - this object is returned first.
082:             * @param secondary the map of secondary file objects. It is used 
083:             *     for initialization <code>delegate</code> variable when necessary.
084:             */
085:            public FilesSet(MultiDataObject mdo) {
086:                this .mymdo = mdo;
087:            }
088:
089:            /** Does the work which was originally done in MDO.files() method. */
090:            private void doLazyWork() {
091:                synchronized (this ) {
092:                    if (!lazyWorkDone) {
093:                        lazyWorkDone = true;
094:
095:                        synchronized (mymdo.synchObjectSecondary()) {
096:                            // cleans up invalid entries
097:                            mymdo.secondaryEntries();
098:                            primaryFile = mymdo.getPrimaryFile();
099:                            secondary = mymdo.getSecondary();
100:                        }
101:                    }
102:                }
103:            }
104:
105:            /** Perform lazy initialization of delegate TreeSet.
106:             */
107:            private Set<FileObject> getDelegate() {
108:                doLazyWork();
109:                // This synchronized block was moved from MultiDataObject.files() method,
110:                // because of lazy initialization of delegate TreeSet.
111:                // Hopefully won't cause threading problems.
112:                synchronized (secondary) {
113:                    if (delegate == null) {
114:                        delegate = new TreeSet<FileObject>(
115:                                new FilesComparator());
116:                        delegate.add(primaryFile);
117:                        delegate.addAll(secondary.keySet());
118:                    }
119:                }
120:                return delegate;
121:            }
122:
123:            // =====================================================================
124:            //   Implementation of Set interface methods
125:            // =====================================================================
126:
127:            public boolean add(FileObject obj) {
128:                return getDelegate().add(obj);
129:            }
130:
131:            public boolean addAll(Collection<? extends FileObject> collection) {
132:                return getDelegate().addAll(collection);
133:            }
134:
135:            public void clear() {
136:                getDelegate().clear();
137:            }
138:
139:            public boolean contains(Object obj) {
140:                return getDelegate().contains(obj);
141:            }
142:
143:            public boolean containsAll(Collection<?> collection) {
144:                return getDelegate().containsAll(collection);
145:            }
146:
147:            public boolean isEmpty() {
148:                doLazyWork();
149:                synchronized (secondary) {
150:                    return (delegate == null) ? false : delegate.isEmpty();
151:                }
152:            }
153:
154:            public Iterator<FileObject> iterator() {
155:                doLazyWork();
156:                synchronized (secondary) {
157:                    return (delegate == null) ? new FilesIterator() : delegate
158:                            .iterator();
159:                }
160:            }
161:
162:            public boolean remove(Object obj) {
163:                return getDelegate().remove(obj);
164:            }
165:
166:            public boolean removeAll(Collection<?> collection) {
167:                return getDelegate().removeAll(collection);
168:            }
169:
170:            public boolean retainAll(Collection<?> collection) {
171:                return getDelegate().retainAll(collection);
172:            }
173:
174:            public int size() {
175:                doLazyWork();
176:                synchronized (secondary) {
177:                    return (delegate == null) ? (secondary.size() + 1)
178:                            : delegate.size();
179:                }
180:            }
181:
182:            public Object[] toArray() {
183:                return getDelegate().toArray();
184:            }
185:
186:            public <T> T[] toArray(T[] obj) {
187:                return getDelegate().toArray(obj);
188:            }
189:
190:            public boolean equals(Object obj) {
191:                return getDelegate().equals(obj);
192:            }
193:
194:            public String toString() {
195:                return getDelegate().toString();
196:            }
197:
198:            public int hashCode() {
199:                return getDelegate().hashCode();
200:            }
201:
202:            /** Iterator for FilesSet. It returns the primaryFile first and 
203:             * then initialize the delegate iterator for secondary files.
204:             */
205:            private final class FilesIterator implements  Iterator<FileObject> {
206:                /** Was the first element (primary file) already returned?
207:                 */
208:                private boolean first = true;
209:
210:                /** Delegation iterator for secondary files. It is lazy initialized after
211:                 * the first element is returned.
212:                 */
213:                private Iterator<FileObject> itDelegate = null;
214:
215:                FilesIterator() {
216:                }
217:
218:                public boolean hasNext() {
219:                    return first ? true : getIteratorDelegate().hasNext();
220:                }
221:
222:                public FileObject next() {
223:                    if (first) {
224:                        first = false;
225:                        return FilesSet.this .primaryFile;
226:                    } else {
227:                        return getIteratorDelegate().next();
228:                    }
229:                }
230:
231:                public void remove() {
232:                    getIteratorDelegate().remove();
233:                }
234:
235:                /** Initialize the delegation iterator.
236:                 */
237:                private Iterator<FileObject> getIteratorDelegate() {
238:                    if (itDelegate == null) {
239:                        // this should return iterator of all files of the MultiDataObject...
240:                        itDelegate = FilesSet.this .getDelegate().iterator();
241:                        // ..., so it is necessary to skip the primary file
242:                        itDelegate.next();
243:                    }
244:                    return itDelegate;
245:                }
246:            }
247:
248:            /** Comparator for file objects. The primary file is less than any other file,
249:             * so it is returned first. Other files are compared by getNameExt() method
250:             * result.
251:             */
252:            private final class FilesComparator implements 
253:                    Comparator<FileObject> {
254:                FilesComparator() {
255:                }
256:
257:                public int compare(FileObject f1, FileObject f2) {
258:                    if (f1 == f2)
259:                        return 0;
260:
261:                    if (f1 == primaryFile)
262:                        return -1;
263:
264:                    if (f2 == primaryFile)
265:                        return 1;
266:
267:                    int res = f1.getNameExt().compareTo(f2.getNameExt());
268:
269:                    if (res == 0) {
270:                        // check whether they both live on the same fs
271:                        try {
272:                            if (f1.getFileSystem() == f2.getFileSystem()) {
273:                                return 0;
274:                            }
275:                            // different fs --> compare the fs names
276:                            return f1.getFileSystem().getSystemName()
277:                                    .compareTo(
278:                                            f2.getFileSystem().getSystemName());
279:                        } catch (org.openide.filesystems.FileStateInvalidException fsie) {
280:                            // should not happen - but the names were the same
281:                            // so we declare they are the same (even if the filesystems
282:                            // crashed meanwhile)
283:                            return 0;
284:                        }
285:                    }
286:
287:                    return res;
288:                }
289:            }
290:        }
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