01: /*
02: * $Id: RebindableIndexedRowIterator.java,v 1.9 2005/12/20 18:32:41 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002-2003 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40:
41: package org.axiondb.engine.rowiterators;
42:
43: import org.axiondb.AxionException;
44: import org.axiondb.BindVariable;
45: import org.axiondb.Function;
46: import org.axiondb.Index;
47: import org.axiondb.RowIterator;
48: import org.axiondb.RowSource;
49:
50: /**
51: * A {@link DelegatingRowIterator} that is wraps
52: * a {@link org.axiondb.RowIterator} from some {@link Index},
53: * and that can be {@link #reset reset} to recreate the iterator
54: * for a new {@link BindVariable bound value}.
55: *
56: * @see org.axiondb.engine.BaseTable#getIndexedRows
57: * @see org.axiondb.Index
58: * @see org.axiondb.BindVariable
59: *
60: * @version $Revision: 1.9 $ $Date: 2005/12/20 18:32:41 $
61: * @author Rodney Waldhoff
62: */
63: public class RebindableIndexedRowIterator extends DelegatingRowIterator {
64: public RebindableIndexedRowIterator(Index index, RowSource table,
65: Function fn, BindVariable bvar) throws AxionException {
66: super (getRowIterator(index, table, fn, bvar));
67: _index = index;
68: _table = table;
69: _function = fn;
70: _bindVar = bvar;
71: }
72:
73: public void reset() throws AxionException {
74: setDelegate(getRowIterator(_index, _table, _function, _bindVar));
75: }
76:
77: private static RowIterator getRowIterator(Index index,
78: RowSource table, Function fn, BindVariable bvar)
79: throws AxionException {
80: return index.getRowIterator(table, fn, bvar.evaluate());
81: }
82:
83: private Index _index;
84: private RowSource _table;
85: private Function _function;
86: private BindVariable _bindVar;
87: }
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