Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ConcatFunction |
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1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ConcatFunction.java,v 1.9 2006/02/05 21:47:41 elharo Exp $ | |
3 | * $Revision: 1.9 $ | |
4 | * $Date: 2006/02/05 21:47:41 $ | |
5 | * | |
6 | * ==================================================================== | |
7 | * | |
8 | * Copyright 2000-2002 bob mcwhirter & James Strachan. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions are | |
13 | * met: | |
14 | * | |
15 | * * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * * Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * | |
22 | * * Neither the name of the Jaxen Project nor the names of its | |
23 | * contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
27 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
28 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A | |
29 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | |
30 | * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
31 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
32 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
33 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
34 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
35 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
36 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
37 | * | |
38 | * ==================================================================== | |
39 | * This software consists of voluntary contributions made by many | |
40 | * individuals on behalf of the Jaxen Project and was originally | |
41 | * created by bob mcwhirter <bob@werken.com> and | |
42 | * James Strachan <jstrachan@apache.org>. For more information on the | |
43 | * Jaxen Project, please see <http://www.jaxen.org/>. | |
44 | * | |
45 | * $Id: ConcatFunction.java,v 1.9 2006/02/05 21:47:41 elharo Exp $ | |
46 | */ | |
47 | ||
48 | ||
49 | package org.jaxen.function; | |
50 | ||
51 | import java.util.Iterator; | |
52 | import java.util.List; | |
53 | ||
54 | import org.jaxen.Context; | |
55 | import org.jaxen.Function; | |
56 | import org.jaxen.FunctionCallException; | |
57 | import org.jaxen.Navigator; | |
58 | ||
59 | /** | |
60 | * <b>4.2</b> <code><i>string</i> concat(<i>string</i>,<i>string</i>,<i>string*</i>)</code> | |
61 | * <p> | |
62 | * Concatenates its arguments and returns the resulting string. | |
63 | * </p> | |
64 | * | |
65 | * @author bob mcwhirter (bob@werken.com) | |
66 | * | |
67 | * @see <a href="http://www.w3.org/TR/xpath#function-concat">Section 4.2 of the XPath Specification</a> | |
68 | */ | |
69 | public class ConcatFunction implements Function | |
70 | { | |
71 | ||
72 | /** | |
73 | * Create a new <code>ConcatFunction</code> object. | |
74 | */ | |
75 | 106 | public ConcatFunction() {} |
76 | ||
77 | /** | |
78 | * Concatenates the arguments and returns the resulting string. | |
79 | * Non-string items are first converted to strings as if by the | |
80 | * XPath <code>string()<code> function. | |
81 | * | |
82 | * @param context the context at the point in the | |
83 | * expression when the function is called | |
84 | * @param args the list of strings to be concatenated | |
85 | * | |
86 | * @return a <code>String</code> containing the concatenation of the items | |
87 | * of <code>args</code> | |
88 | * | |
89 | * @throws FunctionCallException if <code>args</code> has less than two items | |
90 | */ | |
91 | public Object call(Context context, | |
92 | List args) throws FunctionCallException | |
93 | { | |
94 | 58 | if ( args.size() >= 2 ) |
95 | { | |
96 | 56 | return evaluate( args, |
97 | context.getNavigator() ); | |
98 | } | |
99 | ||
100 | 2 | throw new FunctionCallException("concat() requires at least two arguments"); |
101 | } | |
102 | ||
103 | /** | |
104 | * Converts each item in the list to a string and returns the | |
105 | * concatenation of these strings. | |
106 | * If necessary, each item is first converted to a <code>String</code> | |
107 | * as if by the XPath <code>string()</code> function. | |
108 | * | |
109 | * @param list the items to be concatenated | |
110 | * @param nav ignored | |
111 | * | |
112 | * @return the concatenation of the arguments | |
113 | */ | |
114 | public static String evaluate(List list, | |
115 | Navigator nav) | |
116 | { | |
117 | 56 | StringBuffer result = new StringBuffer(); |
118 | 56 | Iterator argIter = list.iterator(); |
119 | 184 | while ( argIter.hasNext() ) |
120 | { | |
121 | 128 | result.append( StringFunction.evaluate( argIter.next(), |
122 | nav ) ); | |
123 | 128 | } |
124 | ||
125 | 56 | return result.toString(); |
126 | } | |
127 | } |