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Java > Open Source Codes > org > apache > xpath > functions > FuncSubstringBefore


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: FuncSubstringBefore.java,v 1.8 2004/02/17 04:34:01 minchau Exp $
18  */
19 package org.apache.xpath.functions;
20
21 import org.apache.xpath.XPathContext;
22 import org.apache.xpath.objects.XObject;
23 import org.apache.xpath.objects.XString;
24
25 /**
26  * Execute the SubstringBefore() function.
27  * @xsl.usage advanced
28  */
29 public class FuncSubstringBefore extends Function2Args
30 {
31
32   /**
33    * Execute the function. The function must return
34    * a valid object.
35    * @param xctxt The current execution context.
36    * @return A valid XObject.
37    *
38    * @throws javax.xml.transform.TransformerException
39    */
40   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException JavaDoc
41   {
42
43     String JavaDoc s1 = m_arg0.execute(xctxt).str();
44     String JavaDoc s2 = m_arg1.execute(xctxt).str();
45     int index = s1.indexOf(s2);
46
47     return (-1 == index)
48            ? XString.EMPTYSTRING : new XString(s1.substring(0, index));
49   }
50 }
51
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