01: /*
02: * $Id: ReferencesOtherTablesWhereNodeVisitor.java,v 1.6 2005/12/20 18:32:27 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002-2004 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.visitors;
42:
43: import org.axiondb.ColumnIdentifier;
44: import org.axiondb.Function;
45: import org.axiondb.Selectable;
46: import org.axiondb.TableIdentifier;
47: import org.axiondb.SelectableVisitor;
48:
49: /**
50: * Return true if reference a table other than the given one, false otherwise.
51: *
52: * @author Rodney Waldhoff
53: */
54: public class ReferencesOtherTablesWhereNodeVisitor implements
55: SelectableVisitor {
56: public ReferencesOtherTablesWhereNodeVisitor(TableIdentifier id) {
57: _id = id;
58: }
59:
60: public boolean getResult() {
61: return _result;
62: }
63:
64: protected boolean hasResult() {
65: return _hasResult;
66: }
67:
68: public void visit(Selectable node) {
69: if (!_hasResult) {
70: if (node instanceof ColumnIdentifier) {
71: ColumnIdentifier aid = (ColumnIdentifier) (node);
72: if (!(_id.equals(aid.getTableIdentifier()))) {
73: _result = false;
74: _hasResult = true;
75: }
76: } else if (node instanceof Function) {
77: Function fn = (Function) node;
78: for (int i = 0, I = fn.getArgumentCount(); i < I; i++) {
79: if (_hasResult) {
80: break;
81: }
82: visit(fn.getArgument(i));
83: }
84: }
85: }
86: }
87:
88: private boolean _hasResult = false;
89: private boolean _result = true;
90: private TableIdentifier _id;
91:
92: }
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