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Java > Open Source Codes > net > sf > saxon > functions > Concat


1 package net.sf.saxon.functions;
2 import net.sf.saxon.expr.XPathContext;
3 import net.sf.saxon.om.Item;
4 import net.sf.saxon.om.FastStringBuffer;
5 import net.sf.saxon.trans.XPathException;
6 import net.sf.saxon.value.AtomicValue;
7 import net.sf.saxon.value.SequenceType;
8 import net.sf.saxon.value.StringValue;
9
10
11 public class Concat extends SystemFunction {
12
13     /**
14     * Get the required type of the nth argument
15     */
16
17     protected SequenceType getRequiredType(int arg) {
18         return getDetails().argumentTypes[0];
19         // concat() is a special case
20 }
21
22     /**
23     * Evaluate the function in a string context
24     */
25
26     public String JavaDoc evaluateAsString(XPathContext c) throws XPathException {
27         return evaluateItem(c).getStringValue();
28     }
29
30     /**
31     * Evaluate in a general context
32     */
33
34     public Item evaluateItem(XPathContext c) throws XPathException {
35         int numArgs = argument.length;
36         FastStringBuffer sb = new FastStringBuffer(1024);
37         for (int i=0; i<numArgs; i++) {
38             AtomicValue val = (AtomicValue)argument[i].evaluateItem(c);
39             if (val!=null) {
40                 sb.append(val.getStringValueCS());
41             }
42         }
43         return StringValue.makeStringValue(sb.condense());
44     }
45
46 }
47
48
49
50 //
51 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
52 // you may not use this file except in compliance with the License. You may obtain a copy of the
53 // License at http://www.mozilla.org/MPL/
54 //
55 // Software distributed under the License is distributed on an "AS IS" basis,
56 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
57 // See the License for the specific language governing rights and limitations under the License.
58 //
59 // The Original Code is: all this file.
60 //
61 // The Initial Developer of the Original Code is Michael H. Kay.
62 //
63 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
64 //
65 // Contributor(s): none.
66 //
67
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