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1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the  "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 /*
19  * $Id: FuncContains.java 468655 2006-10-28 07:12:06Z minchau $
20  */
21 package org.apache.xpath.functions;
22 
23 import org.apache.xpath.XPathContext;
24 import org.apache.xpath.objects.XBoolean;
25 import org.apache.xpath.objects.XObject;
26 
27 /**
28  * Execute the Contains() function.
29  * @xsl.usage advanced
30  */
31 public class FuncContains extends Function2Args
32 {
33     static final long serialVersionUID = 5084753781887919723L;
34 
35   /**
36    * Execute the function.  The function must return
37    * a valid object.
38    * @param xctxt The current execution context.
39    * @return A valid XObject.
40    *
41    * @throws javax.xml.transform.TransformerException
42    */
execute(XPathContext xctxt)43   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
44   {
45 
46     String s1 = m_arg0.execute(xctxt).str();
47     String s2 = m_arg1.execute(xctxt).str();
48 
49     // Add this check for JDK consistency for empty strings.
50     if (s1.length() == 0 && s2.length() == 0)
51       return XBoolean.S_TRUE;
52 
53     int index = s1.indexOf(s2);
54 
55     return (index > -1) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
56   }
57 }
58