Source Code Cross Referenced for ArrayIterator.java in  » Template-Engine » Velocity » org » apache » velocity » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » Velocity » org.apache.velocity.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.velocity.util;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.    
020:         */
021:
022:        import java.util.Iterator;
023:        import java.util.NoSuchElementException;
024:        import java.lang.reflect.Array;
025:
026:        /**
027:         *  <p>
028:         *  An Iterator wrapper for an Object[]. This will
029:         *  allow us to deal with all array like structures
030:         *  in a consistent manner.
031:         *  </p>
032:         *  <p>
033:         *  WARNING : this class's operations are NOT synchronized.
034:         *  It is meant to be used in a single thread, newly created
035:         *  for each use in the #foreach() directive.
036:         *  If this is used or shared, synchronize in the
037:         *  next() method.
038:         *  </p>
039:         *
040:         * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
041:         * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
042:         * @version $Id: ArrayIterator.java 463298 2006-10-12 16:10:32Z henning $
043:         */
044:        public class ArrayIterator implements  Iterator {
045:            /**
046:             * The objects to iterate.
047:             */
048:            private Object array;
049:
050:            /**
051:             * The current position and size in the array.
052:             */
053:            private int pos;
054:            private int size;
055:
056:            /**
057:             * Creates a new iterator instance for the specified array.
058:             *
059:             * @param array The array for which an iterator is desired.
060:             */
061:            public ArrayIterator(Object array) {
062:                /*
063:                 * if this isn't an array, then throw.  Note that this is
064:                 * for internal use - so this should never happen - if it does
065:                 *  we screwed up.
066:                 */
067:
068:                if (!array.getClass().isArray()) {
069:                    throw new IllegalArgumentException(
070:                            "Programmer error : internal ArrayIterator invoked w/o array");
071:                }
072:
073:                this .array = array;
074:                pos = 0;
075:                size = Array.getLength(this .array);
076:            }
077:
078:            /**
079:             * Move to next element in the array.
080:             *
081:             * @return The next object in the array.
082:             */
083:            public Object next() {
084:                if (pos < size)
085:                    return Array.get(array, pos++);
086:
087:                /*
088:                 *  we screwed up...
089:                 */
090:
091:                throw new NoSuchElementException("No more elements: " + pos
092:                        + " / " + size);
093:            }
094:
095:            /**
096:             * Check to see if there is another element in the array.
097:             *
098:             * @return Whether there is another element.
099:             */
100:            public boolean hasNext() {
101:                return (pos < size);
102:            }
103:
104:            /**
105:             * No op--merely added to satify the <code>Iterator</code> interface.
106:             */
107:            public void remove() {
108:                throw new UnsupportedOperationException();
109:            }
110:        }
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