Source Code Cross Referenced for EmptyIterator.java in  » Development » jga-Generic-Algorithms » net » sf » jga » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » jga Generic Algorithms » net.sf.jga.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // ============================================================================
002:        // $Id: EmptyIterator.java,v 1.6 2005/08/02 23:45:22 davidahall Exp $
003:        // Copyright (c) 2003-2005  David A. Hall
004:        // ============================================================================
005:        // The contents of this file are subject to the Common Development and
006:        // Distribution License (CDDL), Version 1.0 (the License); you may not use this 
007:        // file except in compliance with the License.  You should have received a copy
008:        // of the the License along with this file: if not, a copy of the License is 
009:        // available from Sun Microsystems, Inc.
010:        //
011:        // http://www.sun.com/cddl/cddl.html
012:        //
013:        // From time to time, the license steward (initially Sun Microsystems, Inc.) may
014:        // publish revised and/or new versions of the License.  You may not use,  
015:        // distribute, or otherwise make this file available under subsequent versions 
016:        // of the License.
017:        // 
018:        // Alternatively, the contents of this file may be used under the terms of the 
019:        // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
020:        // case the provisions of the LGPL are applicable instead of those above. If you 
021:        // wish to allow use of your version of this file only under the terms of the 
022:        // LGPL, and not to allow others to use your version of this file under the 
023:        // terms of the CDDL, indicate your decision by deleting the provisions above 
024:        // and replace them with the notice and other provisions required by the LGPL. 
025:        // If you do not delete the provisions above, a recipient may use your version 
026:        // of this file under the terms of either the CDDL or the LGPL.
027:        // 
028:        // This library is distributed in the hope that it will be useful,
029:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
030:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
031:        // ============================================================================
032:        package net.sf.jga.util;
033:
034:        import java.util.ListIterator;
035:        import java.util.NoSuchElementException;
036:        import java.util.Iterator;
037:
038:        /**
039:         * Iterator over an empty set of elements.
040:         *
041:         * @author <a href="mailto:davidahall@users.sf.net">David A. Hall</a>
042:         */
043:
044:        public class EmptyIterator<T> implements  ListIterator<T>, Iterable<T> {
045:
046:            // - - - - - - - - - - -
047:            // Iterable<T> interface
048:            // - - - - - - - - - - -
049:
050:            public Iterator<T> iterator() {
051:                return this ;
052:            }
053:
054:            // - - - - - - - - - - - - -
055:            // ListIterator<T> interface
056:            // - - - - - - - - - - - - -
057:
058:            /**
059:             * Returns false: the set of elements is empty by definition
060:             * @return false
061:             */
062:            public boolean hasNext() {
063:                return false;
064:            }
065:
066:            /**
067:             * throws NoSuchElement exception
068:             *
069:             * @return nothing
070:             */
071:            public T next() {
072:                throw new NoSuchElementException();
073:            }
074:
075:            /**
076:             * Returns false: the set of elements is empty by definition
077:             * @return false
078:             */
079:            public boolean hasPrevious() {
080:                return false;
081:            }
082:
083:            /**
084:             * throws NoSuchElement exception
085:             *
086:             * @return nothing
087:             */
088:            public T previous() {
089:                throw new NoSuchElementException();
090:            }
091:
092:            /**
093:             * returns the size of the list (0, in this case)
094:             *
095:             * @return 0
096:             */
097:            public int nextIndex() {
098:                return 0;
099:            }
100:
101:            /**
102:             * returns -1, as there is no previous
103:             *
104:             * @return -1;
105:             */
106:            public int previousIndex() {
107:                return -1;
108:            }
109:
110:            /**
111:             * throws UnsupportedOperationException
112:             */
113:            public void remove() {
114:                throw new UnsupportedOperationException();
115:            }
116:
117:            /**
118:             * throws UnsupportedOperationException
119:             */
120:            public void set(T arg) {
121:                throw new UnsupportedOperationException();
122:            }
123:
124:            /**
125:             * throws UnsupportedOperationException
126:             */
127:            public void add(T arg) {
128:                throw new UnsupportedOperationException();
129:            }
130:
131:        }
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