1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the  "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18/*
19 * $Id: Number.java 468655 2006-10-28 07:12:06Z minchau $
20 */
21package org.apache.xpath.operations;
22
23import org.apache.xpath.XPathContext;
24import org.apache.xpath.objects.XNumber;
25import org.apache.xpath.objects.XObject;
26
27/**
28 * The 'number()' operation expression executer.
29 */
30public class Number extends UnaryOperation
31{
32    static final long serialVersionUID = 7196954482871619765L;
33
34  /**
35   * Apply the operation to two operands, and return the result.
36   *
37   *
38   * @param right non-null reference to the evaluated right operand.
39   *
40   * @return non-null reference to the XObject that represents the result of the operation.
41   *
42   * @throws javax.xml.transform.TransformerException
43   */
44  public XObject operate(XObject right) throws javax.xml.transform.TransformerException
45  {
46
47    if (XObject.CLASS_NUMBER == right.getType())
48      return right;
49    else
50      return new XNumber(right.num());
51  }
52
53  /**
54   * Evaluate this operation directly to a double.
55   *
56   * @param xctxt The runtime execution context.
57   *
58   * @return The result of the operation as a double.
59   *
60   * @throws javax.xml.transform.TransformerException
61   */
62  public double num(XPathContext xctxt)
63          throws javax.xml.transform.TransformerException
64  {
65
66    return m_right.num(xctxt);
67  }
68
69}
70