001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.contrib.table.model.common;
016
017import java.util.Iterator;
018import java.util.NoSuchElementException;
019
020/**
021 * @author mindbridge
022 */
023public class ArrayIterator implements Iterator
024{
025        private Object[] m_arrValues;
026        private int m_nFrom;
027        private int m_nTo;
028        private int m_nCurrent;
029
030        public ArrayIterator(Object[] arrValues)
031        {
032                this(arrValues, 0, arrValues.length);
033        }
034
035        public ArrayIterator(Object[] arrValues, int nFrom, int nTo)
036        {
037                m_arrValues = arrValues;
038                m_nFrom = nFrom;
039                m_nTo = nTo;
040
041                if (m_nFrom < 0)
042                        m_nFrom = 0;
043                if (m_nTo < m_nFrom)
044                        m_nTo = m_nFrom;
045                if (m_nTo > m_arrValues.length)
046                        m_nTo = m_arrValues.length;
047
048                m_nCurrent = m_nFrom;
049        }
050
051        /**
052         * @see java.util.Iterator#hasNext()
053         */
054        public boolean hasNext()
055        {
056                return m_nCurrent < m_nTo;
057        }
058
059        /**
060         * @see java.util.Iterator#next()
061         */
062        public Object next()
063        {
064                //System.out.println("index: " + m_nCurrent + "   size: " + m_arrValues.length + "  to: " + m_nTo);
065                if (!hasNext())
066                        throw new NoSuchElementException();
067                return m_arrValues[m_nCurrent++];
068        }
069
070        /**
071         * @see java.util.Iterator#remove()
072         */
073        public void remove()
074        {
075                throw new UnsupportedOperationException();
076        }
077
078}