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: Equals.java,v 1.10 2004/08/17 19:25:40 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 '=' operation expression executer.
27: */
28: public class Equals extends Operation {
29: static final long serialVersionUID = -2658315633903426134L;
30:
31: /**
32: * Apply the operation to two operands, and return the result.
33: *
34: *
35: * @param left non-null reference to the evaluated left operand.
36: * @param right non-null reference to the evaluated right operand.
37: *
38: * @return non-null reference to the XObject that represents the result of the operation.
39: *
40: * @throws javax.xml.transform.TransformerException
41: */
42: public XObject operate(XObject left, XObject right)
43: throws javax.xml.transform.TransformerException {
44: return left.equals(right) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
45: }
46:
47: /**
48: * Execute a binary operation by calling execute on each of the operands,
49: * and then calling the operate method on the derived class.
50: *
51: *
52: * @param xctxt The runtime execution context.
53: *
54: * @return The XObject result of the operation.
55: *
56: * @throws javax.xml.transform.TransformerException
57: */
58: public boolean bool(XPathContext xctxt)
59: throws javax.xml.transform.TransformerException {
60: XObject left = m_left.execute(xctxt, true);
61: XObject right = m_right.execute(xctxt, true);
62:
63: boolean result = left.equals(right) ? true : false;
64: left.detach();
65: right.detach();
66: return result;
67: }
68:
69: }
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