01: /*
02: * Copyright 1999-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: /*
17: * $Id: Or.java,v 1.10 2004/08/17 19:25:41 jycli Exp $
18: */
19: package org.apache.xpath.operations;
20:
21: import org.apache.xpath.XPathContext;
22: import org.apache.xpath.objects.XBoolean;
23: import org.apache.xpath.objects.XObject;
24:
25: /**
26: * The 'or' operation expression executer.
27: */
28: public class Or extends Operation {
29: static final long serialVersionUID = -644107191353853079L;
30:
31: /**
32: * OR two expressions and return the boolean result. Override
33: * superclass method for optimization purposes.
34: *
35: * @param xctxt The runtime execution context.
36: *
37: * @return {@link org.apache.xpath.objects.XBoolean#S_TRUE} or
38: * {@link org.apache.xpath.objects.XBoolean#S_FALSE}.
39: *
40: * @throws javax.xml.transform.TransformerException
41: */
42: public XObject execute(XPathContext xctxt)
43: throws javax.xml.transform.TransformerException {
44:
45: XObject expr1 = m_left.execute(xctxt);
46:
47: if (!expr1.bool()) {
48: XObject expr2 = m_right.execute(xctxt);
49:
50: return expr2.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
51: } else
52: return XBoolean.S_TRUE;
53: }
54:
55: /**
56: * Evaluate this operation directly to a boolean.
57: *
58: * @param xctxt The runtime execution context.
59: *
60: * @return The result of the operation as a boolean.
61: *
62: * @throws javax.xml.transform.TransformerException
63: */
64: public boolean bool(XPathContext xctxt)
65: throws javax.xml.transform.TransformerException {
66: return (m_left.bool(xctxt) || m_right.bool(xctxt));
67: }
68:
69: }
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