001: /*
002: * $Id: FilteringChangingIndexedRowIterator.java,v 1.5 2005/03/25 23:19:16 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2004-2005 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: package org.axiondb.engine.rowiterators;
041:
042: import org.axiondb.AxionException;
043: import org.axiondb.RowDecorator;
044: import org.axiondb.Selectable;
045:
046: /**
047: * @author Ritesh Adval
048: */
049: public class FilteringChangingIndexedRowIterator extends
050: FilteringRowIterator implements MutableIndexedRowIterator {
051:
052: public FilteringChangingIndexedRowIterator(
053: MutableIndexedRowIterator iterator, RowDecorator decorator,
054: Selectable where) {
055: super (iterator, decorator, where);
056: _iterator = iterator;
057: }
058:
059: public String getShortName() {
060: return "FilteringChangingIndexed";
061: }
062:
063: public boolean hasNext() {
064: if (indexSet()) {
065: return super .hasNext();
066: }
067: return false;
068: }
069:
070: public boolean hasPrevious() {
071: if (indexSet()) {
072: return super .hasPrevious();
073: }
074: return false;
075: }
076:
077: public boolean indexSet() {
078: return (_indexSet);
079: }
080:
081: public boolean isEmpty() {
082: if (_indexSet) {
083: return (super .isEmpty());
084: }
085: return (false);
086: }
087:
088: public void removeIndexKey() throws AxionException {
089: _indexSet = false;
090: _iterator.removeIndexKey();
091: reset();
092: }
093:
094: public void reset() throws AxionException {
095: if (_indexSet) {
096: super .reset();
097: }
098: }
099:
100: public void setIndexKey(Object value) throws AxionException {
101: _indexSet = true;
102: _iterator.setIndexKey(value);
103: reset();
104: }
105:
106: private boolean _indexSet = false;
107: private MutableIndexedRowIterator _iterator;
108: }
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