1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.xpath.internal.operations;
23
24import com.sun.org.apache.xpath.internal.XPathContext;
25import com.sun.org.apache.xpath.internal.objects.XNumber;
26import com.sun.org.apache.xpath.internal.objects.XObject;
27
28/**
29 * The 'number()' operation expression executer.
30 */
31public class Number extends UnaryOperation
32{
33    static final long serialVersionUID = 7196954482871619765L;
34
35  /**
36   * Apply the operation to two operands, and return the result.
37   *
38   *
39   * @param right non-null reference to the evaluated right operand.
40   *
41   * @return non-null reference to the XObject that represents the result of the operation.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject operate(XObject right) throws javax.xml.transform.TransformerException
46  {
47
48    if (XObject.CLASS_NUMBER == right.getType())
49      return right;
50    else
51      return new XNumber(right.num());
52  }
53
54  /**
55   * Evaluate this operation directly to a double.
56   *
57   * @param xctxt The runtime execution context.
58   *
59   * @return The result of the operation as a double.
60   *
61   * @throws javax.xml.transform.TransformerException
62   */
63  public double num(XPathContext xctxt)
64          throws javax.xml.transform.TransformerException
65  {
66
67    return m_right.num(xctxt);
68  }
69
70}
71