Source Code Cross Referenced for DoubleCollectionToCollectionAdapter.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.DoubleCollection;
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:         *  double 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        DoubleCollection
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 DoubleCollectionToCollectionAdapter extends
042:                AbstractCollection {
043:
044:            /** The underlying primitive collection. */
045:            protected DoubleCollection collection;
046:
047:            /**
048:             *  Creates a new adaption of a collection of double
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 DoubleCollectionToCollectionAdapter(
058:                    DoubleCollection collection) {
059:                super ();
060:                if (collection == null)
061:                    Exceptions.nullArgument("collection");
062:                this .collection = collection;
063:            }
064:
065:            /**
066:             *  Adds an element to this collection. The element is added
067:             *  to the underlying collection.
068:             *
069:             *  @param      o
070:             *              the element to add to this collection.
071:             *
072:             *  @return     <tt>true</tt> if this collection was modified
073:             *              as a result of adding <tt>o</tt>; returns
074:             *              <tt>false</tt> otherwise.
075:             *
076:             *  @throws     IllegalArgumentException
077:             *              if <tt>o</tt> is <tt>null</tt>.
078:             *
079:             *  @throws     ClassCastException
080:             *              if <tt>o</tt> is not of class {@link Double Double}.
081:             *
082:             *  @throws     UnsupportedOperationException
083:             *              if the operation is not supported by the
084:             *              underlying collection.
085:             */
086:            public boolean add(Object o) {
087:                if (o == null)
088:                    Exceptions.nullElementNotAllowed();
089:                return collection.add(((Double) o).doubleValue());
090:            }
091:
092:            /**
093:             *  Clears this collection. The underlying collection is
094:             *  cleared.
095:             *
096:             *  @throws     UnsupportedOperationException
097:             *              if the operation is not supported by the
098:             *              underlying collection.
099:             */
100:            public void clear() {
101:                collection.clear();
102:            }
103:
104:            /**
105:             *  Indicates whether this collection contains a specified
106:             *  element. For this collection to contain an object, the
107:             *  underlying collection must contain its unwrapped value.
108:             *  <p>Note that this collection can never contain <tt>null</tt>
109:             *  values or values of other classes than {@link Double Double}.
110:             *  In those cases, this method will return <tt>false</tt>.
111:             *
112:             *  @param      o
113:             *              the element to test for containment.
114:             *
115:             *  @return     <tt>true</tt> if <tt>o</tt> is contained in this
116:             *              collection; returns <tt>false</tt> otherwise.
117:             */
118:            public boolean contains(Object o) {
119:                try {
120:                    return collection.contains(((Double) o).doubleValue());
121:                } catch (ClassCastException cce) {
122:                } catch (NullPointerException npe) {
123:                }
124:                return false;
125:            }
126:
127:            /**
128:             *  Returns an iterator over this collection.
129:             *
130:             *  @return     an iterator over this collection.
131:             */
132:            public Iterator iterator() {
133:                return new DoubleIteratorToIteratorAdapter(collection
134:                        .iterator());
135:            }
136:
137:            /**
138:             *  Removes a specified element from this collection.
139:             *  The unwrapped element is removed from the underlying collection.
140:             *  <p>Note that this collection can never contain <tt>null</tt>
141:             *  values or values of other classes than {@link Double Double}.
142:             *  In those cases, this method will return <tt>false</tt>.
143:             *
144:             *  @param      o
145:             *              the Double value to remove from this collection.
146:             *
147:             *  @return     <tt>true</tt> if this collection was modified
148:             *              as a result of removing <tt>o</tt>; returns
149:             *              <tt>false</tt> otherwise.
150:             *
151:             *  @throws     UnsupportedOperationException
152:             *              if the operation is not supported by the 
153:             *              underlying collection.
154:             */
155:            public boolean remove(Object o) {
156:                try {
157:                    return collection.remove(((Double) o).doubleValue());
158:                } catch (ClassCastException cce) {
159:                } catch (NullPointerException npe) {
160:                }
161:                return false;
162:            }
163:
164:            /**
165:             *  Removes all the elements of a specified collection from
166:             *  this collection. The unwrapped elements are removed from
167:             *  the underlying collection.
168:             *  <p>This method is only overridden to work
169:             *  around a bug in {@link AbstractCollection AbstractCollection},
170:             *  which does not throw a 
171:             *  {@link NullPointerException NullPointerException} when the
172:             *  argument is <tt>null</tt> and the collection is empty.
173:             *
174:             *  @param      c
175:             *              the collection whose elements to remove from this
176:             *              collection.
177:             *
178:             *  @return     <tt>true</tt> if this collection was modified
179:             *              as a result of removing the elements of <tt>c</tt>;
180:             *              returns <tt>false</tt> otherwise.
181:             *
182:             *  @throws     UnsupportedOperationException
183:             *              if the operation is not supported by the underlying
184:             *              collection.
185:             *
186:             *  @throws     NullPointerException
187:             *              if <tt>c</tt> is <tt>null</tt>.
188:             */
189:            public boolean removeAll(Collection c) {
190:                if (c == null)
191:                    Exceptions.nullArgument("collection");
192:                return super .removeAll(c);
193:            }
194:
195:            /**
196:             *  Retains only the elements of a specified collection in
197:             *  this collection. The unwrapped elements are removed from
198:             *  the underlying collection.
199:             *  <p>This method is only overridden to work
200:             *  around a bug in {@link AbstractCollection AbstractCollection},
201:             *  which does not throw a 
202:             *  {@link NullPointerException NullPointerException} when the
203:             *  argument is <tt>null</tt> and the collection is empty.
204:             *
205:             *  @param      c
206:             *              the collection whose elements to retain in this
207:             *              collection.
208:             *
209:             *  @return     <tt>true</tt> if this collection was modified
210:             *              as a result of removing the elements not contained
211:             *              in <tt>c</tt>;
212:             *              returns <tt>false</tt> otherwise.
213:             *
214:             *  @throws     UnsupportedOperationException
215:             *              if the operation is not supported by the underlying
216:             *              collection.
217:             *
218:             *  @throws     NullPointerException
219:             *              if <tt>c</tt> is <tt>null</tt>.
220:             */
221:            public boolean retainAll(Collection c) {
222:                if (c == null)
223:                    Exceptions.nullArgument("collection");
224:                return super .retainAll(c);
225:            }
226:
227:            /**
228:             *  Returns the number of elements in this collection. The
229:             *  number of elements is the same as that of the underlying
230:             *  collection.
231:             *
232:             *  @return     the number of elements in this collection.
233:             */
234:            public int size() {
235:                return collection.size();
236:            }
237:
238:            /**
239:             *  Returns a hash code value for this collection. The hash code
240:             *  returned is that of the underlying collection.
241:             *
242:             *  @return     a hash code value for this collection.
243:             */
244:            public int hashCode() {
245:                return collection.hashCode();
246:            }
247:
248:        }
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