001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.messaging.amf.persistence;
023
024 import java.io.IOException;
025 import java.io.ObjectInput;
026 import java.io.ObjectOutput;
027 import java.util.Arrays;
028 import java.util.Collection;
029 import java.util.Comparator;
030 import java.util.Iterator;
031 import java.util.Map;
032 import java.util.Map.Entry;
033 import java.util.NoSuchElementException;
034 import java.util.Set;
035
036 import org.granite.messaging.persistence.PersistentCollectionSnapshot;
037
038 /**
039 * @author Franck WOLFF
040 */
041 public class AMFPersistentCollectionSnapshot implements PersistentCollectionSnapshot {
042
043 private static final long serialVersionUID = 1L;
044
045 protected boolean initialized = false;
046 protected String detachedState = null;
047 protected boolean dirty = false;
048 protected Object[] elements = null;
049
050 public AMFPersistentCollectionSnapshot(String detachedState) {
051 this.detachedState = detachedState;
052 }
053
054 public AMFPersistentCollectionSnapshot(boolean sorted, String detachedState) {
055 this.detachedState = detachedState;
056 }
057
058 public AMFPersistentCollectionSnapshot(boolean initialized, String detachedState, boolean dirty, Collection<?> collection) {
059 this.initialized = initialized;
060 this.detachedState = detachedState;
061 if (initialized) {
062 this.dirty = dirty;
063 this.elements = collection.toArray();
064 }
065 }
066
067 public AMFPersistentCollectionSnapshot(boolean initialized, String detachedState, boolean dirty, Map<?, ?> collection) {
068 this.initialized = initialized;
069 this.detachedState = detachedState;
070 if (initialized) {
071 this.dirty = dirty;
072
073 Object[] entries = collection.entrySet().toArray();
074 this.elements = new Object[entries.length];
075
076 int elementIndex = 0;
077 for (int entryIndex = 0; entryIndex < entries.length; entryIndex++) {
078 Map.Entry<?, ?> entry = (Map.Entry<?, ?>)entries[entryIndex];
079 this.elements[elementIndex++] = new Object[] { entry.getKey(), entry.getValue() };
080 }
081 }
082 }
083
084 public boolean isInitialized() {
085 return initialized;
086 }
087
088 public String getDetachedState() {
089 return detachedState;
090 }
091
092 public boolean isDirty() {
093 return dirty;
094 }
095
096 public boolean isSorted() {
097 return false;
098 }
099
100 public <T> Comparator<T> newComparator(ObjectInput in) {
101 return null;
102 }
103
104 @SuppressWarnings("unchecked")
105 public <T> Collection<T> getElementsAsCollection() {
106 return (Collection<T>)Arrays.asList(elements);
107 }
108
109 public <K, V> Map<K, V> getElementsAsMap() {
110 return new SnapshotMap<K, V>(elements);
111 }
112
113 public void writeExternal(ObjectOutput out) throws IOException {
114 out.writeObject(initialized);
115 out.writeObject(detachedState);
116 if (initialized) {
117 out.writeObject(dirty);
118 out.writeObject(elements);
119 }
120 }
121
122 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
123 readInitializationData(in);
124 if (initialized)
125 readCoreData(in);
126 }
127
128 public void readInitializationData(ObjectInput in) throws IOException, ClassNotFoundException {
129 initialized = ((Boolean)in.readObject()).booleanValue();
130 detachedState = (String)in.readObject();
131 }
132
133 public void readCoreData(ObjectInput in) throws IOException, ClassNotFoundException {
134 this.dirty = ((Boolean)in.readObject()).booleanValue();
135 this.elements = (Object[])in.readObject();
136 }
137
138 static class SnapshotMap<K, V> implements Map<K, V> {
139
140 private final Object[] elements;
141
142 public SnapshotMap(Object[] elements) {
143 this.elements = elements;
144 }
145
146 public int size() {
147 return elements.length;
148 }
149
150 public boolean isEmpty() {
151 return elements.length == 0;
152 }
153
154 public Set<Entry<K, V>> entrySet() {
155 return new Set<Entry<K, V>>() {
156
157 public int size() {
158 return elements.length;
159 }
160
161 public boolean isEmpty() {
162 return elements.length == 0;
163 }
164
165 public Iterator<Entry<K, V>> iterator() {
166
167 return new Iterator<Entry<K, V>>() {
168
169 private int cursor = 0;
170
171 public boolean hasNext() {
172 return cursor < elements.length;
173 }
174
175 @SuppressWarnings("unchecked")
176 public Entry<K, V> next() {
177 if (cursor >= elements.length)
178 throw new NoSuchElementException();
179
180 Object[] element = (Object[])elements[cursor++];
181 K key = (K)element[0];
182 V value = (V)element[1];
183 return new SnapshotMapEntry<K, V>(key, value);
184 }
185
186 public void remove() {
187 throw new UnsupportedOperationException();
188 }
189 };
190 }
191
192 public boolean contains(Object o) {
193 throw new UnsupportedOperationException();
194 }
195
196 public Object[] toArray() {
197 throw new UnsupportedOperationException();
198 }
199
200 public <T> T[] toArray(T[] a) {
201 throw new UnsupportedOperationException();
202 }
203
204 public boolean add(Entry<K, V> e) {
205 throw new UnsupportedOperationException();
206 }
207
208 public boolean remove(Object o) {
209 throw new UnsupportedOperationException();
210 }
211
212 public boolean containsAll(Collection<?> c) {
213 throw new UnsupportedOperationException();
214 }
215
216 public boolean addAll(Collection<? extends Entry<K, V>> c) {
217 throw new UnsupportedOperationException();
218 }
219
220 public boolean retainAll(Collection<?> c) {
221 throw new UnsupportedOperationException();
222 }
223
224 public boolean removeAll(Collection<?> c) {
225 throw new UnsupportedOperationException();
226 }
227
228 public void clear() {
229 throw new UnsupportedOperationException();
230 }
231
232 @Override
233 public int hashCode() {
234 throw new UnsupportedOperationException();
235 }
236
237 @Override
238 public boolean equals(Object obj) {
239 throw new UnsupportedOperationException();
240 }
241 };
242 }
243
244 public boolean containsKey(Object key) {
245 throw new UnsupportedOperationException();
246 }
247
248 public boolean containsValue(Object value) {
249 throw new UnsupportedOperationException();
250 }
251
252 public V get(Object key) {
253 throw new UnsupportedOperationException();
254 }
255
256 public V put(K key, V value) {
257 throw new UnsupportedOperationException();
258 }
259
260 public V remove(Object key) {
261 throw new UnsupportedOperationException();
262 }
263
264 public void putAll(Map<? extends K, ? extends V> m) {
265 throw new UnsupportedOperationException();
266 }
267
268 public void clear() {
269 throw new UnsupportedOperationException();
270 }
271
272 public Set<K> keySet() {
273 throw new UnsupportedOperationException();
274 }
275
276 public Collection<V> values() {
277 throw new UnsupportedOperationException();
278 }
279
280 @Override
281 public int hashCode() {
282 throw new UnsupportedOperationException();
283 }
284
285 @Override
286 public boolean equals(Object obj) {
287 throw new UnsupportedOperationException();
288 }
289 }
290
291 static class SnapshotMapEntry<K, V> implements Entry<K, V> {
292
293 private final K key;
294 private final V value;
295
296 public SnapshotMapEntry(K key, V value) {
297 this.key = key;
298 this.value = value;
299 }
300
301 public K getKey() {
302 return key;
303 }
304
305 public V getValue() {
306 return value;
307 }
308
309 public V setValue(V value) {
310 throw new UnsupportedOperationException();
311 }
312
313 @Override
314 public int hashCode() {
315 return (key == null ? 0 : key.hashCode()) ^ (value == null ? 0 : value.hashCode());
316 }
317
318 @Override
319 public boolean equals(Object obj) {
320 if (!(obj instanceof Entry))
321 return false;
322 Entry<?, ?> e = (Entry<?, ?>)obj;
323 return (
324 (key == null ? e.getKey() == null : key.equals(e.getKey())) &&
325 (value == null ? e.getValue() == null : value.equals(e.getValue()))
326 );
327 }
328 }
329 }