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: XUnresolvedVariableSimple.java 468643 2006-10-28 06:56:03Z minchau $
20 */
21package org.apache.xalan.templates;
22
23import org.apache.xpath.Expression;
24import org.apache.xpath.XPathContext;
25import org.apache.xpath.objects.XObject;
26
27
28/**
29 * This is the same as XUnresolvedVariable, but it assumes that the
30 * context is already set up.  For use with psuedo variables.
31 * Also, it holds an Expression object, instead of an ElemVariable.
32 * It must only hold static context, since a single copy will be
33 * held in the template.
34 */
35public class XUnresolvedVariableSimple extends XObject
36{
37    static final long serialVersionUID = -1224413807443958985L;
38  public XUnresolvedVariableSimple(ElemVariable obj)
39  {
40    super(obj);
41  }
42
43
44  /**
45   * For support of literal objects in xpaths.
46   *
47   * @param xctxt The XPath execution context.
48   *
49   * @return This object.
50   *
51   * @throws javax.xml.transform.TransformerException
52   */
53  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
54  {
55  	Expression expr = ((ElemVariable)m_obj).getSelect().getExpression();
56    XObject xobj = expr.execute(xctxt);
57    xobj.allowDetachToRelease(false);
58    return xobj;
59  }
60
61  /**
62   * Tell what kind of class this is.
63   *
64   * @return CLASS_UNRESOLVEDVARIABLE
65   */
66  public int getType()
67  {
68    return CLASS_UNRESOLVEDVARIABLE;
69  }
70
71  /**
72   * Given a request type, return the equivalent string.
73   * For diagnostic purposes.
74   *
75   * @return An informational string.
76   */
77  public String getTypeString()
78  {
79    return "XUnresolvedVariableSimple (" + object().getClass().getName() + ")";
80  }
81
82
83}
84
85