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


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: FuncNormalizeSpace.java,v 1.12 2004/02/17 04:34:01 minchau Exp $
18  */
19 package org.apache.xpath.functions;
20
21 import org.apache.xml.dtm.DTM;
22 import org.apache.xml.utils.XMLString;
23 import org.apache.xpath.XPathContext;
24 import org.apache.xpath.objects.XObject;
25 import org.apache.xpath.objects.XString;
26 import org.xml.sax.ContentHandler JavaDoc;
27
28 /**
29  * Execute the normalize-space() function.
30  * @xsl.usage advanced
31  */
32 public class FuncNormalizeSpace extends FunctionDef1Arg
33 {
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    */
43   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException JavaDoc
44   {
45     XMLString s1 = getArg0AsString(xctxt);
46
47     return (XString)s1.fixWhiteSpace(true, true, false);
48   }
49   
50   /**
51    * Execute an expression in the XPath runtime context, and return the
52    * result of the expression.
53    *
54    *
55    * @param xctxt The XPath runtime context.
56    *
57    * @return The result of the expression in the form of a <code>XObject</code>.
58    *
59    * @throws javax.xml.transform.TransformerException if a runtime exception
60    * occurs.
61    */
62   public void executeCharsToContentHandler(XPathContext xctxt,
63                                               ContentHandler JavaDoc handler)
64     throws javax.xml.transform.TransformerException JavaDoc,
65            org.xml.sax.SAXException JavaDoc
66   {
67     if(Arg0IsNodesetExpr())
68     {
69       int node = getArg0AsNode(xctxt);
70       if(DTM.NULL != node)
71       {
72         DTM dtm = xctxt.getDTM(node);
73         dtm.dispatchCharactersEvents(node, handler, true);
74       }
75     }
76     else
77     {
78       XObject obj = execute(xctxt);
79       obj.dispatchCharactersEvents(handler);
80     }
81   }
82
83 }
84
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