01: /*
02: * $Id: BaseBooleanBranchFunction.java,v 1.5 2005/12/20 18:32:28 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2003-2005 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.functions;
42:
43: import org.axiondb.AxionException;
44: import org.axiondb.DataType;
45: import org.axiondb.RowDecorator;
46: import org.axiondb.types.BooleanType;
47:
48: /**
49: * @version $Revision: 1.5 $ $Date: 2005/12/20 18:32:28 $
50: * @author Rodney Waldhoff
51: * @author Jonathan Giron
52: */
53: public abstract class BaseBooleanBranchFunction extends BaseFunction
54: implements ScalarFunction {
55: public BaseBooleanBranchFunction(String name) {
56: super (name);
57: }
58:
59: public final DataType getDataType() {
60: return BOOLEAN_TYPE;
61: }
62:
63: public final Object evaluate(RowDecorator row)
64: throws AxionException {
65: boolean hasUnknown = false;
66:
67: for (int i = 0, I = getArgumentCount(); i < I; i++) {
68: Object rawVal = getArgument(i).evaluate(row);
69: DataType type = getArgument(i).getDataType();
70: Object val = type.convert(rawVal);
71: if (null == val) {
72: hasUnknown = true;
73: } else if (exitOnValue() == type.toBoolean(val)) {
74: return exitOnValue() ? Boolean.TRUE : Boolean.FALSE;
75: }
76: }
77: return hasUnknown ? null : (exitOnValue() ? Boolean.FALSE
78: : Boolean.TRUE);
79: }
80:
81: public final boolean isValid() {
82: return true;
83: }
84:
85: protected abstract boolean exitOnValue();
86:
87: private static final DataType BOOLEAN_TYPE = new BooleanType();
88: }
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