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.functions;
23
24import com.sun.org.apache.xalan.internal.res.XSLMessages;
25import com.sun.org.apache.xpath.internal.XPathContext;
26import com.sun.org.apache.xpath.internal.objects.XObject;
27import com.sun.org.apache.xpath.internal.objects.XString;
28
29/**
30 * Execute the Concat() function.
31 * @xsl.usage advanced
32 */
33public class FuncConcat extends FunctionMultiArgs
34{
35    static final long serialVersionUID = 1737228885202314413L;
36
37  /**
38   * Execute the function.  The function must return
39   * a valid object.
40   * @param xctxt The current execution context.
41   * @return A valid XObject.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
46  {
47
48    StringBuffer sb = new StringBuffer();
49
50    // Compiler says we must have at least two arguments.
51    sb.append(m_arg0.execute(xctxt).str());
52    sb.append(m_arg1.execute(xctxt).str());
53
54    if (null != m_arg2)
55      sb.append(m_arg2.execute(xctxt).str());
56
57    if (null != m_args)
58    {
59      for (int i = 0; i < m_args.length; i++)
60      {
61        sb.append(m_args[i].execute(xctxt).str());
62      }
63    }
64
65    return new XString(sb.toString());
66  }
67
68  /**
69   * Check that the number of arguments passed to this function is correct.
70   *
71   *
72   * @param argNum The number of arguments that is being passed to the function.
73   *
74   * @throws WrongNumberArgsException
75   */
76  public void checkNumberArgs(int argNum) throws WrongNumberArgsException
77  {
78    if (argNum < 2)
79      reportWrongNumberArgs();
80  }
81
82  /**
83   * Constructs and throws a WrongNumberArgException with the appropriate
84   * message for this function object.
85   *
86   * @throws WrongNumberArgsException
87   */
88  protected void reportWrongNumberArgs() throws WrongNumberArgsException {
89      throw new WrongNumberArgsException(XSLMessages.createXPATHMessage("gtone", null));
90  }
91}
92