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Java > Open Source Codes > org > xquark > extractor > xfunctions > XfConcat


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 Universite de Versailles Saint-Quentin.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.extractor.xfunctions;
24
25 import java.util.List JavaDoc;
26
27 import org.xquark.extractor.common.Debug;
28 import org.xquark.extractor.sql.SqlExpression;
29 /**
30 3.5.2 xf:concat
31 3.5.2.1 Signature
32 xf:concat(string $headString, string* $otherStrings) => string
33 3.5.2.2 Parameters
34 $headString — static type is string
35 $otherStrings — static type is string*
36 3.5.2.3 Semantics
37 Returns the string that is the concatenation of the values of its arguments. XPath allows a
38 variable number of arguments. The resulting string might not be normalized in any Unicode or W3C
39 normalization.
40 NOTE:
41 The concat() function is specified to allow an arbitrary number of string arguments that are
42 concatenated together. This capability is retained for compatibility with [XPath 1.0] and is the
43 only function specified in this document that has that characteristic.
44 3.5.2.4 Examples
45 xf:concat('abc', 'def') returns "abcdef".
46 xf:concat('abc') returns abc.
47 xf:concat('abc', 'def', 'ghi', 'jkl', 'mno') returns "abcdefghijklmno".
48  */
49
50 public final class XfConcat extends Xfunction_String
51 {
52     private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
53     private static final String JavaDoc RCSName = "$Name: $";
54
55
56     /**
57     @roseuid 3BD14D1E02B2
58      */
59     public XfConcat()
60     {
61         super("XfConcat");
62     }
63
64     /**
65     @param arguments
66     @roseuid 3BD1465C017E
67      */
68     public XfConcat(List JavaDoc arguments)
69     {
70         super("XfConcat");
71         setArguments(arguments);
72         Debug.assertTrue(1<arguments.size(),"1<arguments.size()");
73     }
74
75     public SqlExpression accept(org.xquark.extractor.algebra.GenSqlVisitor visitor)
76     {
77         return visitor.visit(this);
78     }
79
80     public void accept(org.xquark.extractor.algebra.AlgebraVisitor visitor)
81     {
82         visitor.visit(this);
83     }
84 }
85
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