001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: ElemParam.java 468643 2006-10-28 06:56:03Z minchau $
020 */
021 package org.apache.xalan.templates;
022
023 import javax.xml.transform.TransformerException;
024
025 import org.apache.xalan.transformer.TransformerImpl;
026 import org.apache.xpath.VariableStack;
027 import org.apache.xpath.objects.XObject;
028
029 /**
030 * Implement xsl:param.
031 * <pre>
032 * <!ELEMENT xsl:param %template;>
033 * <!ATTLIST xsl:param
034 * name %qname; #REQUIRED
035 * select %expr; #IMPLIED
036 * >
037 * </pre>
038 * @see <a href="http://www.w3.org/TR/xslt#variables">variables in XSLT Specification</a>
039 * @xsl.usage advanced
040 */
041 public class ElemParam extends ElemVariable
042 {
043 static final long serialVersionUID = -1131781475589006431L;
044 int m_qnameID;
045
046 /**
047 * Constructor ElemParam
048 *
049 */
050 public ElemParam(){}
051
052 /**
053 * Get an int constant identifying the type of element.
054 * @see org.apache.xalan.templates.Constants
055 *
056 * @return The token ID of the element
057 */
058 public int getXSLToken()
059 {
060 return Constants.ELEMNAME_PARAMVARIABLE;
061 }
062
063 /**
064 * Return the node name.
065 *
066 * @return The element's name
067 */
068 public String getNodeName()
069 {
070 return Constants.ELEMNAME_PARAMVARIABLE_STRING;
071 }
072
073 /**
074 * Copy constructor.
075 *
076 * @param param Element from an xsl:param
077 *
078 * @throws TransformerException
079 */
080 public ElemParam(ElemParam param) throws TransformerException
081 {
082 super(param);
083 }
084
085 /**
086 * This function is called after everything else has been
087 * recomposed, and allows the template to set remaining
088 * values that may be based on some other property that
089 * depends on recomposition.
090 */
091 public void compose(StylesheetRoot sroot) throws TransformerException
092 {
093 super.compose(sroot);
094 m_qnameID = sroot.getComposeState().getQNameID(m_qname);
095 int parentToken = m_parentNode.getXSLToken();
096 if (parentToken == Constants.ELEMNAME_TEMPLATE
097 || parentToken == Constants.EXSLT_ELEMNAME_FUNCTION)
098 ((ElemTemplate)m_parentNode).m_inArgsSize++;
099 }
100
101 /**
102 * Execute a variable declaration and push it onto the variable stack.
103 * @see <a href="http://www.w3.org/TR/xslt#variables">variables in XSLT Specification</a>
104 *
105 * @param transformer non-null reference to the the current transform-time state.
106 *
107 * @throws TransformerException
108 */
109 public void execute(TransformerImpl transformer) throws TransformerException
110 {
111 if (transformer.getDebug())
112 transformer.getTraceManager().fireTraceEvent(this);
113
114 VariableStack vars = transformer.getXPathContext().getVarStack();
115
116 if(!vars.isLocalSet(m_index))
117 {
118
119 int sourceNode = transformer.getXPathContext().getCurrentNode();
120 XObject var = getValue(transformer, sourceNode);
121
122 // transformer.getXPathContext().getVarStack().pushVariable(m_qname, var);
123 transformer.getXPathContext().getVarStack().setLocalVariable(m_index, var);
124 }
125
126 if (transformer.getDebug())
127 transformer.getTraceManager().fireTraceEndEvent(this);
128 }
129
130 }