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: Number.java,v 1.9 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.XNumber;
23: import org.apache.xpath.objects.XObject;
24:
25: /**
26: * The 'number()' operation expression executer.
27: */
28: public class Number extends UnaryOperation {
29: static final long serialVersionUID = 7196954482871619765L;
30:
31: /**
32: * Apply the operation to two operands, and return the result.
33: *
34: *
35: * @param right non-null reference to the evaluated right operand.
36: *
37: * @return non-null reference to the XObject that represents the result of the operation.
38: *
39: * @throws javax.xml.transform.TransformerException
40: */
41: public XObject operate(XObject right)
42: throws javax.xml.transform.TransformerException {
43:
44: if (XObject.CLASS_NUMBER == right.getType())
45: return right;
46: else
47: return new XNumber(right.num());
48: }
49:
50: /**
51: * Evaluate this operation directly to a double.
52: *
53: * @param xctxt The runtime execution context.
54: *
55: * @return The result of the operation as a double.
56: *
57: * @throws javax.xml.transform.TransformerException
58: */
59: public double num(XPathContext xctxt)
60: throws javax.xml.transform.TransformerException {
61:
62: return m_right.num(xctxt);
63: }
64:
65: }
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