Source Code Cross Referenced for CharCollectionToCollectionAdapter.java in  » Development » PCJ » bak » pcj » adapter » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » PCJ » bak.pcj.adapter 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Primitive Collections for Java.
003:         *  Copyright (C) 2002  Søren Bak
004:         *
005:         *  This library is free software; you can redistribute it and/or
006:         *  modify it under the terms of the GNU Lesser General Public
007:         *  License as published by the Free Software Foundation; either
008:         *  version 2.1 of the License, or (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         *  Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public
016:         *  License along with this library; if not, write to the Free Software
017:         *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         */
019:        package bak.pcj.adapter;
020:
021:        import bak.pcj.CharCollection;
022:        import bak.pcj.util.Exceptions;
023:        import java.util.Collection;
024:        import java.util.AbstractCollection;
025:        import java.util.Iterator;
026:
027:        /**
028:         *  This class represents adaptions of primitive collections of
029:         *  char values to Java Collections Framework collections. The adapter
030:         *  is implemented as a wrapper around a primitive collection. Thus, 
031:         *  changes to the underlying collection are reflected by this
032:         *  collection and vice versa.
033:         *
034:         *  @see        CharCollection
035:         *  @see        java.util.Collection
036:         *
037:         *  @author     Søren Bak
038:         *  @version    1.2     21-08-2003 19:01
039:         *  @since      1.0
040:         */
041:        public class CharCollectionToCollectionAdapter extends
042:                AbstractCollection {
043:
044:            /** The underlying primitive collection. */
045:            protected CharCollection collection;
046:
047:            /**
048:             *  Creates a new adaption of a collection of char
049:             *  values to a Java Collections Framework collection.
050:             *
051:             *  @param      collection
052:             *              the underlying primitive collection.
053:             *
054:             *  @throws     NullPointerException
055:             *              if <tt>collection</tt> is <tt>null</tt>.
056:             */
057:            public CharCollectionToCollectionAdapter(CharCollection collection) {
058:                super ();
059:                if (collection == null)
060:                    Exceptions.nullArgument("collection");
061:                this .collection = collection;
062:            }
063:
064:            /**
065:             *  Adds an element to this collection. The element is added
066:             *  to the underlying collection.
067:             *
068:             *  @param      o
069:             *              the element to add to this collection.
070:             *
071:             *  @return     <tt>true</tt> if this collection was modified
072:             *              as a result of adding <tt>o</tt>; returns
073:             *              <tt>false</tt> otherwise.
074:             *
075:             *  @throws     IllegalArgumentException
076:             *              if <tt>o</tt> is <tt>null</tt>.
077:             *
078:             *  @throws     ClassCastException
079:             *              if <tt>o</tt> is not of class {@link Character Character}.
080:             *
081:             *  @throws     UnsupportedOperationException
082:             *              if the operation is not supported by the
083:             *              underlying collection.
084:             */
085:            public boolean add(Object o) {
086:                if (o == null)
087:                    Exceptions.nullElementNotAllowed();
088:                return collection.add(((Character) o).charValue());
089:            }
090:
091:            /**
092:             *  Clears this collection. The underlying collection is
093:             *  cleared.
094:             *
095:             *  @throws     UnsupportedOperationException
096:             *              if the operation is not supported by the
097:             *              underlying collection.
098:             */
099:            public void clear() {
100:                collection.clear();
101:            }
102:
103:            /**
104:             *  Indicates whether this collection contains a specified
105:             *  element. For this collection to contain an object, the
106:             *  underlying collection must contain its unwrapped value.
107:             *  <p>Note that this collection can never contain <tt>null</tt>
108:             *  values or values of other classes than {@link Character Character}.
109:             *  In those cases, this method will return <tt>false</tt>.
110:             *
111:             *  @param      o
112:             *              the element to test for containment.
113:             *
114:             *  @return     <tt>true</tt> if <tt>o</tt> is contained in this
115:             *              collection; returns <tt>false</tt> otherwise.
116:             */
117:            public boolean contains(Object o) {
118:                try {
119:                    return collection.contains(((Character) o).charValue());
120:                } catch (ClassCastException cce) {
121:                } catch (NullPointerException npe) {
122:                }
123:                return false;
124:            }
125:
126:            /**
127:             *  Returns an iterator over this collection.
128:             *
129:             *  @return     an iterator over this collection.
130:             */
131:            public Iterator iterator() {
132:                return new CharIteratorToIteratorAdapter(collection.iterator());
133:            }
134:
135:            /**
136:             *  Removes a specified element from this collection.
137:             *  The unwrapped element is removed from the underlying collection.
138:             *  <p>Note that this collection can never contain <tt>null</tt>
139:             *  values or values of other classes than {@link Character Character}.
140:             *  In those cases, this method will return <tt>false</tt>.
141:             *
142:             *  @param      o
143:             *              the Character value to remove from this collection.
144:             *
145:             *  @return     <tt>true</tt> if this collection was modified
146:             *              as a result of removing <tt>o</tt>; returns
147:             *              <tt>false</tt> otherwise.
148:             *
149:             *  @throws     UnsupportedOperationException
150:             *              if the operation is not supported by the 
151:             *              underlying collection.
152:             */
153:            public boolean remove(Object o) {
154:                try {
155:                    return collection.remove(((Character) o).charValue());
156:                } catch (ClassCastException cce) {
157:                } catch (NullPointerException npe) {
158:                }
159:                return false;
160:            }
161:
162:            /**
163:             *  Removes all the elements of a specified collection from
164:             *  this collection. The unwrapped elements are removed from
165:             *  the underlying collection.
166:             *  <p>This method is only overridden to work
167:             *  around a bug in {@link AbstractCollection AbstractCollection},
168:             *  which does not throw a 
169:             *  {@link NullPointerException NullPointerException} when the
170:             *  argument is <tt>null</tt> and the collection is empty.
171:             *
172:             *  @param      c
173:             *              the collection whose elements to remove from this
174:             *              collection.
175:             *
176:             *  @return     <tt>true</tt> if this collection was modified
177:             *              as a result of removing the elements of <tt>c</tt>;
178:             *              returns <tt>false</tt> otherwise.
179:             *
180:             *  @throws     UnsupportedOperationException
181:             *              if the operation is not supported by the underlying
182:             *              collection.
183:             *
184:             *  @throws     NullPointerException
185:             *              if <tt>c</tt> is <tt>null</tt>.
186:             */
187:            public boolean removeAll(Collection c) {
188:                if (c == null)
189:                    Exceptions.nullArgument("collection");
190:                return super .removeAll(c);
191:            }
192:
193:            /**
194:             *  Retains only the elements of a specified collection in
195:             *  this collection. The unwrapped elements are removed from
196:             *  the underlying collection.
197:             *  <p>This method is only overridden to work
198:             *  around a bug in {@link AbstractCollection AbstractCollection},
199:             *  which does not throw a 
200:             *  {@link NullPointerException NullPointerException} when the
201:             *  argument is <tt>null</tt> and the collection is empty.
202:             *
203:             *  @param      c
204:             *              the collection whose elements to retain in this
205:             *              collection.
206:             *
207:             *  @return     <tt>true</tt> if this collection was modified
208:             *              as a result of removing the elements not contained
209:             *              in <tt>c</tt>;
210:             *              returns <tt>false</tt> otherwise.
211:             *
212:             *  @throws     UnsupportedOperationException
213:             *              if the operation is not supported by the underlying
214:             *              collection.
215:             *
216:             *  @throws     NullPointerException
217:             *              if <tt>c</tt> is <tt>null</tt>.
218:             */
219:            public boolean retainAll(Collection c) {
220:                if (c == null)
221:                    Exceptions.nullArgument("collection");
222:                return super .retainAll(c);
223:            }
224:
225:            /**
226:             *  Returns the number of elements in this collection. The
227:             *  number of elements is the same as that of the underlying
228:             *  collection.
229:             *
230:             *  @return     the number of elements in this collection.
231:             */
232:            public int size() {
233:                return collection.size();
234:            }
235:
236:            /**
237:             *  Returns a hash code value for this collection. The hash code
238:             *  returned is that of the underlying collection.
239:             *
240:             *  @return     a hash code value for this collection.
241:             */
242:            public int hashCode() {
243:                return collection.hashCode();
244:            }
245:
246:        }
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