001: /*
002: * $Id: IntIteratorIntListIterator.java,v 1.2 2004/09/09 23:47:45 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2003 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb.util;
042:
043: import java.util.NoSuchElementException;
044:
045: import org.apache.commons.collections.primitives.ArrayIntList;
046: import org.apache.commons.collections.primitives.IntIterator;
047: import org.apache.commons.collections.primitives.IntList;
048: import org.apache.commons.collections.primitives.IntListIterator;
049:
050: /**
051: * @version $Revision: 1.2 $ $Date: 2004/09/09 23:47:45 $
052: * @author Rodney Waldhoff
053: */
054: public class IntIteratorIntListIterator implements IntListIterator {
055: public IntIteratorIntListIterator(IntIterator iterator) {
056: _iterator = iterator;
057: }
058:
059: public void add(int value) {
060: throw new UnsupportedOperationException();
061: }
062:
063: public boolean hasNext() {
064: return _nextIndex < _history.size() || _iterator.hasNext();
065: }
066:
067: public boolean hasPrevious() {
068: return _nextIndex > 0;
069: }
070:
071: public int next() {
072: if (_nextIndex < _history.size()) {
073: return _history.get(_nextIndex++);
074: }
075: int val = _iterator.next();
076: _history.add(val);
077: _nextIndex++;
078: return val;
079: }
080:
081: public int nextIndex() {
082: return _nextIndex;
083: }
084:
085: public int previous() {
086: if (hasPrevious()) {
087: return _history.get(--_nextIndex);
088: }
089: throw new NoSuchElementException();
090: }
091:
092: public int previousIndex() {
093: return (_nextIndex - 1);
094: }
095:
096: public void remove() {
097: throw new UnsupportedOperationException();
098: }
099:
100: public void set(int value) {
101: throw new UnsupportedOperationException();
102: }
103:
104: private IntIterator _iterator = null;
105: private IntList _history = new ArrayIntList();
106: private int _nextIndex = 0;
107:
108: }
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