Source Code Cross Referenced for AttributeSet.java in  » Internationalization-Localization » icu4j » com » ibm » richtext » textlayout » attributes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.richtext.textlayout.attributes 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * (C) Copyright IBM Corp. 1998-2004.  All Rights Reserved.
003:         *
004:         * The program is provided "as is" without any warranty express or
005:         * implied, including the warranty of non-infringement and the implied
006:         * warranties of merchantibility and fitness for a particular purpose.
007:         * IBM will not be liable for any damages suffered by you as a result
008:         * of using the Program. In no event will IBM be liable for any
009:         * special, indirect or consequential damages or lost profits even if
010:         * IBM has been advised of the possibility of their occurrence. IBM
011:         * will not be liable for any third party claims against you.
012:         */
013:        // Requires Java2
014:        package com.ibm.richtext.textlayout.attributes;
015:
016:        import java.util.Hashtable;
017:        import java.util.Enumeration;
018:        import java.util.Iterator;
019:        import java.util.Set;
020:        import java.util.Collection;
021:
022:        /**
023:         * An AttributeSet is an immutable collection of unique Objects.
024:         * It has several operations
025:         * which return new AttributeSet instances.
026:         */
027:        public final class AttributeSet implements  Set {
028:
029:            static final String COPYRIGHT = "(C) Copyright IBM Corp. 1998-1999 - All Rights Reserved";
030:
031:            /**
032:             * An AttributeSet with no members.
033:             */
034:            public static final AttributeSet EMPTY_SET = new AttributeSet();
035:
036:            private Hashtable elements;
037:
038:            private static final String errString = "AttributeSet is immutable.";
039:
040:            private AttributeSet(Hashtable elements) {
041:
042:                this .elements = elements;
043:            }
044:
045:            /**
046:             * Package only.  For AttributeMap use.
047:             */
048:            static AttributeSet createKeySet(Hashtable hashtable) {
049:
050:                Hashtable newElements = new Hashtable();
051:
052:                Enumeration e = hashtable.keys();
053:                while (e.hasMoreElements()) {
054:                    Object next = e.nextElement();
055:                    newElements.put(next, next);
056:                }
057:
058:                return new AttributeSet(newElements);
059:            }
060:
061:            /**
062:             * Create a new, empty AttributeSet.  The set is semantically
063:             * equivalent to EMPTY_SET.
064:             */
065:            public AttributeSet() {
066:
067:                elements = new Hashtable();
068:            }
069:
070:            /**
071:             * Create a new AttributeSet with the single element elem.
072:             */
073:            public AttributeSet(Object elem) {
074:
075:                elements = new Hashtable(1, 1);
076:                elements.put(elem, elem);
077:            }
078:
079:            /**
080:             * Create a new AttributeSet containing the items in the array elems.
081:             */
082:            public AttributeSet(Object[] elems) {
083:
084:                elements = new Hashtable(elems.length, 1);
085:                for (int i = 0; i < elems.length; i++) {
086:                    Object next = elems[i];
087:                    elements.put(next, next);
088:                }
089:            }
090:
091:            /**
092:             * Return true if the number of elements in this set is 0.
093:             * @return true if the number of elements in this set is 0
094:             */
095:            public boolean isEmpty() {
096:
097:                return elements.isEmpty();
098:            }
099:
100:            /**
101:             * Return the number of elements in this set.
102:             * @return the number of elements in this set
103:             */
104:            public int size() {
105:
106:                return elements.size();
107:            }
108:
109:            public boolean equals(Object rhs) {
110:
111:                try {
112:                    return equals((AttributeSet) rhs);
113:                } catch (ClassCastException e) {
114:                    return false;
115:                }
116:            }
117:
118:            public boolean equals(AttributeSet rhs) {
119:
120:                if (rhs == null) {
121:                    return false;
122:                }
123:
124:                return elements.equals(rhs.elements);
125:            }
126:
127:            /**
128:             * Return true if this set contains the given Object
129:             * @return true if this set contains <code>o</code>
130:             */
131:            public boolean contains(Object o) {
132:
133:                Object value = elements.get(o);
134:                return value != null;
135:            }
136:
137:            /**
138:             * Return true if this set contains all elements in the given
139:             * Collection
140:             * @param coll the collection to compare with
141:             * @return true if this set contains all elements in the given
142:             * Collection
143:             */
144:            public boolean containsAll(Collection coll) {
145:
146:                return elements.keySet().containsAll(coll);
147:            }
148:
149:            /**
150:             * Return an Enumeration of the elements in this set.
151:             * @return an Enumeration of the elements in this set
152:             */
153:            public Enumeration elements() {
154:
155:                return elements.keys();
156:            }
157:
158:            /**
159:             * Return an Iterator with the elements in this set.
160:             * @return an Iterator with the elements in this set.
161:             * The Iterator cannot be used to modify this AttributeSet.
162:             */
163:            public Iterator iterator() {
164:
165:                return new EnumerationIterator(elements.keys());
166:            }
167:
168:            /**
169:             * Fill in the given array with the elements in this set.
170:             * @param storage an array to fill with this set's elements.
171:             * The array cannot be null.
172:             * @return the <tt>storage</tt> array.
173:             */
174:            public Object[] toArray(Object[] storage) {
175:
176:                Enumeration keys = elements.keys();
177:                int n = 0;
178:                while (keys.hasMoreElements()) {
179:                    storage[n++] = keys.nextElement();
180:                }
181:                return storage;
182:            }
183:
184:            /**
185:             * Return an array with the elements in this set.
186:             * @return an array with the elements in this set
187:             */
188:            public Object[] toArray() {
189:
190:                return toArray(new Object[size()]);
191:            }
192:
193:            /**
194:             * Throws UnsupportedOperationException.
195:             * @see #addElement
196:             * @throws UnsupportedOperationException
197:             */
198:            public boolean add(Object o) {
199:                throw new UnsupportedOperationException(errString);
200:            }
201:
202:            /**
203:             * Throws UnsupportedOperationException.
204:             * @throws UnsupportedOperationException
205:             */
206:            public boolean remove(Object o) {
207:                throw new UnsupportedOperationException(errString);
208:            }
209:
210:            /**
211:             * Throws UnsupportedOperationException.
212:             * @see #unionWith
213:             * @throws UnsupportedOperationException
214:             */
215:            public boolean addAll(Collection coll) {
216:                throw new UnsupportedOperationException(errString);
217:            }
218:
219:            /**
220:             * Throws UnsupportedOperationException.
221:             * @see #subtract
222:             * @throws UnsupportedOperationException
223:             */
224:            public boolean removeAll(Collection coll) {
225:                throw new UnsupportedOperationException(errString);
226:            }
227:
228:            /**
229:             * Throws UnsupportedOperationException.
230:             * @see #intersectWith
231:             * @throws UnsupportedOperationException
232:             */
233:            public boolean retainAll(Collection coll) {
234:                throw new UnsupportedOperationException(errString);
235:            }
236:
237:            /**
238:             * Throws UnsupportedOperationException.
239:             * @see #EMPTY_SET
240:             * @throws UnsupportedOperationException
241:             */
242:            public void clear() {
243:                throw new UnsupportedOperationException(errString);
244:            }
245:
246:            /**
247:             * Return an AttributeSet containing the elements of this set
248:             * and the given element
249:             * @param element the element to add
250:             * @return an AttributeSet like this one, with <code>element</code>
251:             * added
252:             */
253:            public AttributeSet addElement(Object element) {
254:
255:                Hashtable newElements = (Hashtable) elements.clone();
256:                newElements.put(element, element);
257:                return new AttributeSet(newElements);
258:            }
259:
260:            /**
261:             * Return an AttributeSet which is the union of
262:             * this set with the given set.
263:             * @param s the set to union with
264:             * @return an AttributeSet of the elements in this set or
265:             * in <code>s</code>
266:             */
267:            public AttributeSet unionWith(AttributeSet s) {
268:
269:                Hashtable newElements = (Hashtable) elements.clone();
270:
271:                Iterator iter = s.iterator();
272:                while (iter.hasNext()) {
273:                    Object next = iter.next();
274:                    newElements.put(next, next);
275:                }
276:
277:                return new AttributeSet(newElements);
278:            }
279:
280:            /**
281:             * Return an AttributeSet which is the intersection of
282:             * this set with the given set.
283:             * @param s the set to intersect with
284:             * @return an AttributeSet of the elements in this set which
285:             * are in <code>s</code>
286:             */
287:            public AttributeSet intersectWith(AttributeSet s) {
288:
289:                Hashtable newElements = new Hashtable();
290:
291:                Iterator iter = s.iterator();
292:                while (iter.hasNext()) {
293:                    Object next = iter.next();
294:                    if (elements.get(next) != null) {
295:                        newElements.put(next, next);
296:                    }
297:                }
298:
299:                return new AttributeSet(newElements);
300:            }
301:
302:            /**
303:             * Return an AttributeSet with the elements in this set which
304:             * are not in the given set.
305:             * @param s the set of elements to exclude
306:             * @return an AttributeSet of the elements in this set which
307:             * are not in <code>s</code>
308:             */
309:            public AttributeSet subtract(AttributeSet s) {
310:
311:                Hashtable newElements = (Hashtable) elements.clone();
312:
313:                Iterator iter = s.iterator();
314:                while (iter.hasNext()) {
315:                    newElements.remove(iter.next());
316:                }
317:
318:                return new AttributeSet(newElements);
319:            }
320:
321:            private static final class EnumerationIterator implements  Iterator {
322:
323:                private Enumeration e;
324:
325:                EnumerationIterator(Enumeration e) {
326:                    this .e = e;
327:                }
328:
329:                public boolean hasNext() {
330:                    return e.hasMoreElements();
331:                }
332:
333:                public Object next() {
334:                    return e.nextElement();
335:                }
336:
337:                public void remove() {
338:                    throw new UnsupportedOperationException(errString);
339:                }
340:            }
341:        }
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