001: /*
002: * $Id: DelegatingRowIterator.java,v 1.12 2005/04/22 02:28:53 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002-2005 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:
041: package org.axiondb.engine.rowiterators;
042:
043: import org.axiondb.AxionException;
044: import org.axiondb.Row;
045: import org.axiondb.RowIterator;
046:
047: /**
048: * An abstract base {@link RowIterator}that delegates all calls to a wrapped instance.
049: *
050: * @version $Revision: 1.12 $ $Date: 2005/04/22 02:28:53 $
051: * @author Rodney Waldhoff
052: */
053: public abstract class DelegatingRowIterator implements RowIterator {
054:
055: public DelegatingRowIterator(RowIterator iter) {
056: setDelegate(iter);
057: }
058:
059: public void add(Row row) throws AxionException {
060: _delegate.add(row);
061: }
062:
063: public Row current() {
064: return _delegate.current();
065: }
066:
067: public int currentIndex() {
068: return _delegate.currentIndex();
069: }
070:
071: public Row first() throws AxionException {
072: return _delegate.first();
073: }
074:
075: public boolean hasCurrent() {
076: return _delegate.hasCurrent();
077: }
078:
079: public boolean hasNext() {
080: return _delegate.hasNext();
081: }
082:
083: public boolean hasPrevious() {
084: return _delegate.hasPrevious();
085: }
086:
087: public boolean isEmpty() {
088: return (!hasNext() && !hasPrevious() && !hasCurrent());
089: }
090:
091: public Row last() throws AxionException {
092: return _delegate.last();
093: }
094:
095: public Row next() throws AxionException {
096: return _delegate.next();
097: }
098:
099: public int next(int count) throws AxionException {
100: return _delegate.next(count);
101: }
102:
103: public int nextIndex() {
104: return _delegate.nextIndex();
105: }
106:
107: public Row peekNext() throws AxionException {
108: return _delegate.peekNext();
109: }
110:
111: public Row peekPrevious() throws AxionException {
112: return _delegate.peekPrevious();
113: }
114:
115: public Row previous() throws AxionException {
116: return _delegate.previous();
117: }
118:
119: public int previous(int count) throws AxionException {
120: return _delegate.previous(count);
121: }
122:
123: public int previousIndex() {
124: return _delegate.previousIndex();
125: }
126:
127: public void remove() throws AxionException {
128: _delegate.remove();
129: }
130:
131: public void reset() throws AxionException {
132: _delegate.reset();
133: }
134:
135: public void set(Row row) throws AxionException {
136: _delegate.set(row);
137: }
138:
139: public int size() throws AxionException {
140: return _delegate.size();
141: }
142:
143: protected RowIterator getDelegate() {
144: return _delegate;
145: }
146:
147: protected void setDelegate(RowIterator delegate) {
148: _delegate = delegate;
149: }
150:
151: private RowIterator _delegate = null;
152: }
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