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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: ElemCopy.java 468643 2006-10-28 06:56:03Z minchau $
20  */
21 package org.apache.xalan.templates;
22 
23 import javax.xml.transform.TransformerException;
24 
25 import org.apache.xalan.transformer.ClonerToResultTree;
26 import org.apache.xalan.transformer.TransformerImpl;
27 import org.apache.xml.dtm.DTM;
28 import org.apache.xalan.serialize.SerializerUtils;
29 import org.apache.xml.serializer.SerializationHandler;
30 import org.apache.xpath.XPathContext;
31 
32 /**
33  * Implement xsl:copy.
34  * <pre>
35  * <!ELEMENT xsl:copy %template;>
36  * <!ATTLIST xsl:copy
37  *   %space-att;
38  *   use-attribute-sets %qnames; #IMPLIED
39  * >
40  * </pre>
41  * @see <a href="http://www.w3.org/TR/xslt#copying">copying in XSLT Specification</a>
42  * @xsl.usage advanced
43  */
44 public class ElemCopy extends ElemUse
45 {
46     static final long serialVersionUID = 5478580783896941384L;
47 
48   /**
49    * Get an int constant identifying the type of element.
50    * @see org.apache.xalan.templates.Constants
51    *
52    * @return The token ID for this element
53    */
getXSLToken()54   public int getXSLToken()
55   {
56     return Constants.ELEMNAME_COPY;
57   }
58 
59   /**
60    * Return the node name.
61    *
62    * @return This element's name
63    */
getNodeName()64   public String getNodeName()
65   {
66     return Constants.ELEMNAME_COPY_STRING;
67   }
68 
69   /**
70    * The xsl:copy element provides an easy way of copying the current node.
71    * Executing this function creates a copy of the current node into the
72    * result tree.
73    * <p>The namespace nodes of the current node are automatically
74    * copied as well, but the attributes and children of the node are not
75    * automatically copied. The content of the xsl:copy element is a
76    * template for the attributes and children of the created node;
77    * the content is instantiated only for nodes of types that can have
78    * attributes or children (i.e. root nodes and element nodes).</p>
79    * <p>The root node is treated specially because the root node of the
80    * result tree is created implicitly. When the current node is the
81    * root node, xsl:copy will not create a root node, but will just use
82    * the content template.</p>
83    *
84    * @param transformer non-null reference to the the current transform-time state.
85    *
86    * @throws TransformerException
87    */
execute( TransformerImpl transformer)88   public void execute(
89           TransformerImpl transformer)
90             throws TransformerException
91   {
92                 XPathContext xctxt = transformer.getXPathContext();
93 
94     try
95     {
96       int sourceNode = xctxt.getCurrentNode();
97       xctxt.pushCurrentNode(sourceNode);
98       DTM dtm = xctxt.getDTM(sourceNode);
99       short nodeType = dtm.getNodeType(sourceNode);
100 
101       if ((DTM.DOCUMENT_NODE != nodeType) && (DTM.DOCUMENT_FRAGMENT_NODE != nodeType))
102       {
103         SerializationHandler rthandler = transformer.getSerializationHandler();
104 
105         // TODO: Process the use-attribute-sets stuff
106         ClonerToResultTree.cloneToResultTree(sourceNode, nodeType, dtm,
107                                              rthandler, false);
108 
109         if (DTM.ELEMENT_NODE == nodeType)
110         {
111           super.execute(transformer);
112           SerializerUtils.processNSDecls(rthandler, sourceNode, nodeType, dtm);
113           transformer.executeChildTemplates(this, true);
114 
115           String ns = dtm.getNamespaceURI(sourceNode);
116           String localName = dtm.getLocalName(sourceNode);
117           transformer.getResultTreeHandler().endElement(ns, localName,
118                                                         dtm.getNodeName(sourceNode));
119         }
120       }
121       else
122       {
123         super.execute(transformer);
124         transformer.executeChildTemplates(this, true);
125       }
126     }
127     catch(org.xml.sax.SAXException se)
128     {
129       throw new TransformerException(se);
130     }
131     finally
132     {
133       xctxt.popCurrentNode();
134     }
135   }
136 }
137