Source Code Cross Referenced for BackupFacility.java in  » IDE-Netbeans » refactoring.api » org » netbeans » modules » refactoring » spi » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » refactoring.api » org.netbeans.modules.refactoring.spi 
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 1997-2007 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.modules.refactoring.spi;
043:
044:        import java.io.File;
045:        import java.io.FileInputStream;
046:        import java.io.FileOutputStream;
047:        import java.io.IOException;
048:        import java.io.InputStream;
049:        import java.io.OutputStream;
050:        import java.net.URI;
051:        import java.net.URISyntaxException;
052:        import java.util.ArrayList;
053:        import java.util.Collection;
054:        import java.util.HashMap;
055:        import org.openide.filesystems.FileObject;
056:        import org.openide.filesystems.FileUtil;
057:        import org.openide.util.Lookup;
058:
059:        /**
060:         * Simple backup facility
061:         * can be used to backup files and implement undo
062:         * For instance Java Refactoring module implements undo this way:
063:         *
064:         * public Problem prepare(RefactoringElementsBag elements) {
065:         * .
066:         * .
067:         *   elements.registerTransaction(new RetoucheCommit(results));
068:         * }
069:         * 
070:         * where RetoucheCommit is Transaction:
071:         * <pre>
072:         * BackupFacility.Handle handle;
073:         * public void commit() {
074:         *   FileObject[] files;
075:         *   .
076:         *   .
077:         *   handle = BackupFacility.getDefault().backup(files);
078:         *   doCommit();
079:         * }
080:         * public void rollback() {
081:         *   //rollback all files
082:         *   handle.restore();
083:         * }
084:         * </pre>
085:         * 
086:         * You can register your own implementation via META-INF services.
087:         * @see Transaction
088:         * @see RefactoringElementImplementation#performChange
089:         * @see RefactoringElementImplementation#undoChange
090:         * @see RefactoringElementsBag#registerTransaction
091:         * @see RefactoringElementsBag#registerFileChange
092:         * @see BackupFacility.Handle
093:         * @author Jan Becicka
094:         */
095:        public abstract class BackupFacility {
096:
097:            private BackupFacility() {
098:            }
099:
100:            private static BackupFacility defaultInstance;
101:
102:            /**
103:             * does beckup
104:             * @param file file(s) to backup
105:             * @return handle which can be used to restore files
106:             * @throws java.io.IOException if backup failed
107:             */
108:            public abstract Handle backup(FileObject... file)
109:                    throws IOException;
110:
111:            /**
112:             * does backup
113:             * @param fileObjects FileObjects to backup
114:             * @return handle which can be used to restore files
115:             * @throws java.io.IOException 
116:             */
117:            public final Handle backup(
118:                    Collection<? extends FileObject> fileObjects)
119:                    throws IOException {
120:                return backup(fileObjects.toArray(new FileObject[fileObjects
121:                        .size()]));
122:            }
123:
124:            /**
125:             * do cleanup
126:             * all backup files are deleted
127:             * all internal structures cleared
128:             * default implementa
129:             */
130:            public abstract void clear();
131:
132:            /**
133:             * @return default instance of this class. If there is instance of this 
134:             * class in META-INF services -> this class is returned. Otherwise default 
135:             * implementation is used.
136:             */
137:            public static BackupFacility getDefault() {
138:                BackupFacility instance = Lookup.getDefault().lookup(
139:                        BackupFacility.class);
140:                return (instance != null) ? instance : getDefaultInstance();
141:            }
142:
143:            private static synchronized BackupFacility getDefaultInstance() {
144:                if (defaultInstance == null) {
145:                    defaultInstance = new DefaultImpl();
146:                }
147:
148:                return defaultInstance;
149:            }
150:
151:            /**
152:             * Handle class representing handle to file{s), which were backuped
153:             * by
154:             * {@link  org.netbeans.modules.refactoring.spi.BackupFacility.backup()}
155:             */
156:            public interface Handle {
157:                /**
158:                 * restore file(s), which was stored by  {@link  org.netbeans.modules.refactoring.spi.BackupFacility.backup()}
159:                 * @throws java.io.IOException if restore failed.
160:                 */
161:                void restore() throws IOException;
162:            }
163:
164:            private static class DefaultHandle implements  Handle {
165:                ArrayList<Long> handle;
166:                DefaultImpl instance;
167:
168:                private DefaultHandle(DefaultImpl instance,
169:                        ArrayList<Long> handles) {
170:                    this .handle = handles;
171:                    this .instance = instance;
172:                }
173:
174:                public void restore() throws IOException {
175:                    for (long l : handle) {
176:                        instance.restore(l);
177:                    }
178:                }
179:            }
180:
181:            private static class DefaultImpl extends BackupFacility {
182:
183:                private long currentId = 0;
184:                private HashMap<Long, BackupEntry> map = new HashMap();
185:
186:                private class BackupEntry {
187:                    private File file;
188:                    private URI path;
189:                }
190:
191:                /** Creates a new instance of BackupFacility */
192:                private DefaultImpl() {
193:                }
194:
195:                public Handle backup(FileObject... file) throws IOException {
196:                    ArrayList<Long> list = new ArrayList();
197:                    for (FileObject f : file) {
198:                        list.add(backup(f));
199:                    }
200:                    return new DefaultHandle(this , list);
201:                }
202:
203:                /**
204:                 * does beckup
205:                 * @param file to backup
206:                 * @return id of backup file
207:                 * @throws java.io.IOException if backup failed
208:                 */
209:                public long backup(FileObject file) throws IOException {
210:                    try {
211:                        BackupEntry entry = new BackupEntry();
212:                        entry.file = File.createTempFile("nbbackup", null); //NOI18N
213:                        copy(FileUtil.toFile(file), entry.file);
214:                        entry.path = file.getURL().toURI();
215:                        map.put(currentId, entry);
216:                        entry.file.deleteOnExit();
217:                        return currentId++;
218:                    } catch (URISyntaxException ex) {
219:                        throw (IOException) new IOException(file.toString())
220:                                .initCause(ex);
221:                    }
222:                }
223:
224:                /**
225:                 * restore file, which was stored by backup(file)
226:                 * @param id identification of backup transaction
227:                 * @throws java.io.IOException if restore failed.
228:                 */
229:                void restore(long id) throws IOException {
230:                    BackupEntry entry = map.get(id);
231:                    if (entry == null) {
232:                        throw new IllegalArgumentException("Backup with id "
233:                                + id + "does not exist"); // NOI18N
234:                    }
235:                    File backup = File.createTempFile("nbbackup", null); //NOI18N
236:                    backup.deleteOnExit();
237:                    File f = new File(entry.path);
238:                    if (createNewFile(f)) {
239:                        backup.createNewFile();
240:                        copy(f, backup);
241:                    }
242:                    FileObject fileObj = FileUtil.toFileObject(f);
243:                    copy(entry.file, fileObj);
244:                    entry.file.delete();
245:                    if (backup.exists()) {
246:                        entry.file = backup;
247:                    } else {
248:                        map.remove(id);
249:                    }
250:                }
251:
252:                /**
253:                 * workaround for #93390
254:                 */
255:                private boolean createNewFile(File f) throws IOException {
256:                    if (f.exists())
257:                        return true;
258:                    File parent = f.getParentFile();
259:                    if (parent != null) {
260:                        createNewFolder(parent);
261:                    }
262:                    FileUtil.createData(f);
263:                    return false;
264:                }
265:
266:                private void createNewFolder(File f) throws IOException {
267:                    if (!f.exists()) {
268:                        File parent = f.getParentFile();
269:                        if (parent != null) {
270:                            createNewFolder(parent);
271:                        }
272:                        FileUtil.createFolder(f);
273:                    }
274:                }
275:
276:                private void copy(File a, File b) throws IOException {
277:                    FileInputStream fs = new FileInputStream(a);
278:                    FileOutputStream fo = new FileOutputStream(b);
279:                    copy(fs, fo);
280:                }
281:
282:                private void copy(File a, FileObject b) throws IOException {
283:                    FileInputStream fs = new FileInputStream(a);
284:                    OutputStream fo = b.getOutputStream();
285:                    copy(fs, fo);
286:                }
287:
288:                private void copy(InputStream is, OutputStream os)
289:                        throws IOException {
290:                    try {
291:                        FileUtil.copy(is, os);
292:                    } finally {
293:                        is.close();
294:                        os.close();
295:                    }
296:                }
297:
298:                public void clear() {
299:                    for (BackupEntry entry : map.values()) {
300:                        entry.file.delete();
301:                    }
302:                    map.clear();
303:                }
304:            }
305:        }
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