Source Code Cross Referenced for ListIteratorToBooleanListIteratorAdapter.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, 2003  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.list.BooleanListIterator;
022:        import bak.pcj.util.Exceptions;
023:        import java.util.ListIterator;
024:
025:        /**
026:         *  This class represents adaptions of Java Collections Framework
027:         *  list iterators to primitive list iterators over boolean values.
028:         *
029:         *  <p>
030:         *  Adapters from JCF collections to primitive collections will
031:         *  fail if the JCF collection contains <tt>null</tt> values or
032:         *  values of the wrong class. However, adapters are not fast
033:         *  failing in the case that the underlying collection should
034:         *  contain illegal values. To implement fast failure would require
035:         *  every operation to check every element of the underlying
036:         *  collection before doing anything. Instead validation methods
037:         *  are provided. They can be called using the assertion facility
038:         *  in the client code:
039:         *  <pre>
040:         *      CollectionToBooleanCollectionAdapter s;
041:         *      ...
042:         *      <b>assert</b> s.validate();
043:         *  </pre>
044:         *  or by letting the adapter throw an exception on illegal values:
045:         *  <pre>
046:         *      CollectionToBooleanCollectionAdapter s;
047:         *      ...
048:         *      s.evalidate();  // Throws an exception on illegal values
049:         *  </pre>
050:         *  Either way, validation must be invoked directly by the client
051:         *  code.
052:         *
053:         *  @author     S&oslash;ren Bak
054:         *  @version    1.2     20-08-2003 23:17
055:         *  @since      1.0
056:         */
057:        public class ListIteratorToBooleanListIteratorAdapter implements 
058:                BooleanListIterator {
059:
060:            /** The underlying iterator. */
061:            protected ListIterator iterator;
062:
063:            /**
064:             *  Creates a new adaption of a list iterator to a primitive 
065:             *  list iterator over boolean values.
066:             *
067:             *  @param      iterator
068:             *              the iterator to adapt to a primitive iterator.
069:             *
070:             *  @throws     NullPointerException
071:             *              if <tt>iterator</tt> is <tt>null</tt>.
072:             */
073:            public ListIteratorToBooleanListIteratorAdapter(
074:                    ListIterator iterator) {
075:                if (iterator == null)
076:                    Exceptions.nullArgument("iterator");
077:                this .iterator = iterator;
078:            }
079:
080:            public void add(boolean v) {
081:                iterator.add(new Boolean(v));
082:            }
083:
084:            public boolean hasNext() {
085:                return iterator.hasNext();
086:            }
087:
088:            public boolean hasPrevious() {
089:                return iterator.hasPrevious();
090:            }
091:
092:            public boolean next() {
093:                return ((Boolean) iterator.next()).booleanValue();
094:            }
095:
096:            public int nextIndex() {
097:                return iterator.nextIndex();
098:            }
099:
100:            public boolean previous() {
101:                return ((Boolean) iterator.previous()).booleanValue();
102:            }
103:
104:            public int previousIndex() {
105:                return iterator.previousIndex();
106:            }
107:
108:            public void remove() {
109:                iterator.remove();
110:            }
111:
112:            public void set(boolean v) {
113:                iterator.set(new Boolean(v));
114:            }
115:
116:        }
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