Source Code Cross Referenced for ListSet.java in  » J2EE » Jaffa » org » jaffa » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         * JAFFA - Java Application Framework For All
004:         *
005:         * Copyright (C) 2002 JAFFA Development Group
006:         *
007:         *     This library 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:         *     This library 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
015:         *     Lesser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020:         *
021:         * Redistribution and use of this software and associated documentation ("Software"),
022:         * with or without modification, are permitted provided that the following conditions are met:
023:         * 1.	Redistributions of source code must retain copyright statements and notices.
024:         *         Redistributions must also contain a copy of this document.
025:         * 2.	Redistributions in binary form must reproduce the above copyright notice,
026:         * 	this list of conditions and the following disclaimer in the documentation
027:         * 	and/or other materials provided with the distribution.
028:         * 3.	The name "JAFFA" must not be used to endorse or promote products derived from
029:         * 	this Software without prior written permission. For written permission,
030:         * 	please contact mail to: jaffagroup@yahoo.com.
031:         * 4.	Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032:         * 	appear in their names without prior written permission.
033:         * 5.	Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034:         *
035:         * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         */
049:
050:        package org.jaffa.util;
051:
052:        import java.util.*;
053:        import java.io.*;
054:
055:        /**
056:         * This class is backed by an ArrayList. Features are
057:         * 1) Ensure the Set functionality of unique elements(including a null) in this data structure
058:         * 2) Iterate through the list in the order in which the entries were made
059:         */
060:        public class ListSet implements  Set, Cloneable, Serializable {
061:
062:            List m_set = null;
063:
064:            /** Creates new ListSet */
065:            public ListSet() {
066:                m_set = new ArrayList();
067:            }
068:
069:            /** Creates new ListSet specifying the initial capacity.
070:             * @param initialCapacity The initial capacity.
071:             */
072:            public ListSet(int initialCapacity) {
073:                m_set = new ArrayList(initialCapacity);
074:            }
075:
076:            /** Creates new ListSet from an existing Collection.
077:             * @param c An existing collection.
078:             */
079:            public ListSet(Collection c) {
080:                m_set = new ArrayList();
081:                if (c != null) {
082:                    for (Iterator itr = c.iterator(); itr.hasNext();) {
083:                        Object obj = itr.next();
084:                        if (!m_set.contains(obj))
085:                            m_set.add(obj);
086:                    }
087:                }
088:            }
089:
090:            // *** Set Interface methods ***
091:            /** Retains only the elements in this set that are contained in the specified collection.
092:             * @param c collection that defines which elements this set will retain.
093:             * @return true if this collection changed as a result of the call.
094:             */
095:            public boolean retainAll(Collection c) {
096:                return m_set.retainAll(c);
097:            }
098:
099:            /** Returns true if this set contains the specified element.
100:             * @param o element whose presence in this set is to be tested.
101:             * @return true if this set contains the specified element.
102:             */
103:            public boolean contains(Object o) {
104:                return m_set.contains(o);
105:            }
106:
107:            /** Returns an array containing all of the elements in this set.
108:             * @return an array containing all of the elements in this set.
109:             */
110:            public Object[] toArray() {
111:                return m_set.toArray();
112:            }
113:
114:            /** Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
115:             * @param a the array into which the elements of this set are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
116:             * @return an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array
117:             */
118:            public Object[] toArray(Object[] a) {
119:                return m_set.toArray(a);
120:            }
121:
122:            /** Returns an iterator over the elements in this set.
123:             * @return an iterator over the elements in this set.
124:             */
125:            public Iterator iterator() {
126:                return m_set.iterator();
127:            }
128:
129:            /** Removes from this set all of its elements that are contained in the specified collection.
130:             * @param c collection that defines which elements will be removed from this set.
131:             * @return true if this set changed as a result of the call.
132:             */
133:            public boolean removeAll(Collection c) {
134:                return m_set.removeAll(c);
135:            }
136:
137:            /** Removes the specified element from this set if it is present.
138:             * @param o object to be removed from this set, if present.
139:             * @return true if the set contained the specified element.
140:             */
141:            public boolean remove(Object o) {
142:                return m_set.remove(o);
143:            }
144:
145:            /** Removes all of the elements from this set.*/
146:            public void clear() {
147:                m_set.clear();
148:            }
149:
150:            /** Returns the hash code value for this set.
151:             * @return the hash code value for this set.
152:             */
153:            public int hashCode() {
154:                return m_set.hashCode();
155:            }
156:
157:            /** Adds all of the elements in the specified collection to this set if they're not already present.
158:             * @param c collection whose elements are to be added to this set.
159:             * @return true if this set changed as a result of the call.
160:             */
161:            public boolean addAll(Collection c) {
162:                boolean added = false;
163:                if (c != null) {
164:                    for (Iterator itr = c.iterator(); itr.hasNext();) {
165:                        Object obj = itr.next();
166:                        if (!m_set.contains(obj)) {
167:                            m_set.add(obj);
168:                            added = true;
169:                        }
170:                    }
171:                }
172:                return added;
173:            }
174:
175:            /** Returns the number of elements in this set.
176:             * @return the number of elements in this set.
177:             */
178:            public int size() {
179:                return m_set.size();
180:            }
181:
182:            /** Returns true if this set contains all of the elements of the specified collection.
183:             * @param c collection to be checked for containment in this set.
184:             * @return true if this set contains all of the elements of the specified collection.
185:             */
186:            public boolean containsAll(Collection c) {
187:                return m_set.containsAll(c);
188:            }
189:
190:            /** Adds the specified element to this set if it is not already present.
191:             * @param o element to be added to this set.
192:             * @return true if this set did not already contain the specified element.
193:             */
194:            public boolean add(Object o) {
195:                boolean added = false;
196:                if (!m_set.contains(o)) {
197:                    m_set.add(o);
198:                    added = true;
199:                }
200:                return added;
201:            }
202:
203:            /** Compares the specified object with this set for equality.
204:             * @param o Object to be compared for equality with this set.
205:             * @return true if the specified Object is equal to this set.
206:             */
207:            public boolean equals(Object o) {
208:                return m_set.equals(o);
209:            }
210:
211:            /** Returns true if this set contains no elements.
212:             * @return true if this set contains no elements.
213:             */
214:            public boolean isEmpty() {
215:                return m_set.isEmpty();
216:            }
217:
218:            // *** Additional Methods ***
219:            /** Adds the specified element to this set if it is not already present, at the specified index.
220:             * @param index The position at which the element is to be added.
221:             * @param o element to be added to this set.
222:             */
223:            public void add(int index, Object o) {
224:                if (!m_set.contains(o))
225:                    m_set.add(index, o);
226:            }
227:
228:            /** Returns the element from the specified position.
229:             * @param index The position from which the element is to be retrieved.
230:             * @return the element from the specified position.
231:             */
232:            public Object get(int index) {
233:                return m_set.get(index);
234:            }
235:
236:            /** Remove the element from the specified position.
237:             * @param index The position from which the element is to be removed.
238:             * @return the element being removed.
239:             */
240:            public Object remove(int index) {
241:                return m_set.remove(index);
242:            }
243:
244:            /** Returns the index of the element in this set.
245:             * @param o The element whose index is to be found.
246:             * @return the index of the element in this set.
247:             */
248:            public int indexOf(Object o) {
249:                return m_set.indexOf(o);
250:            }
251:
252:            // *** CLONEABLE INTERFACE METHODS ***
253:            /** Returns a clone of the Set.
254:             * @throws CloneNotSupportedException if cloning is not supported. Should never happen.
255:             * @return a clone of the Set.
256:             */
257:            public Object clone() throws CloneNotSupportedException {
258:                Object obj = super .clone();
259:                if (m_set != null && m_set instanceof  Cloneable)
260:                    ((ListSet) obj).m_set = (List) ((ArrayList) m_set).clone();
261:                return obj;
262:            }
263:        }
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