/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ElemCallTemplate.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import javax.xml.transform.SourceLocator;
import javax.xml.transform.TransformerException;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xml.utils.QName;
import org.apache.xpath.VariableStack;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;
/**
* Implement xsl:call-template.
* <pre>
* &!ELEMENT xsl:call-template (xsl:with-param)*>
* &!ATTLIST xsl:call-template
* name %qname; #REQUIRED
* &
* </pre>
* @see <a href="http://www.w3.org/TR/xslt#named-templates">named-templates in XSLT Specification</a>
* @xsl.usage advanced
*/
public class ElemCallTemplate extends ElemForEach
{
static final long serialVersionUID = 5009634612916030591L;
/**
* An xsl:call-template element invokes a template by name;
* it has a required name attribute that identifies the template to be invoked.
* @serial
*/
public QName m_templateName = null;
/**
* Set the "name" attribute.
* An xsl:call-template element invokes a template by name;
* it has a required name attribute that identifies the template to be invoked.
*
* @param name Name attribute to set
*/
public void setName(QName name)
{
m_templateName = name;
}
/**
* Get the "name" attribute.
* An xsl:call-template element invokes a template by name;
* it has a required name attribute that identifies the template to be invoked.
*
* @return Name attribute of this element
*/
public QName getName()
{
return m_templateName;
}
/**
* The template which is named by QName.
* @serial
*/
private ElemTemplate m_template = null;
/**
* Get an int constant identifying the type of element.
* @see org.apache.xalan.templates.Constants
*
* @return The token ID for this element
*/
public int getXSLToken()
{
return Constants.ELEMNAME_CALLTEMPLATE;
}
/**
* Return the node name.
*
* @return The name of this element
*/
public String getNodeName()
{
return Constants.ELEMNAME_CALLTEMPLATE_STRING;
}
/**
* This function is called after everything else has been
* recomposed, and allows the template to set remaining
* values that may be based on some other property that
* depends on recomposition.
*/
public void compose(StylesheetRoot sroot) throws TransformerException
{
super.compose(sroot);
// Call compose on each param no matter if this is apply-templates
// or call templates.
int length = getParamElemCount();
for (int i = 0; i < length; i++)
{
ElemWithParam ewp = getParamElem(i);
ewp.compose(sroot);
}
if ((null != m_templateName) && (null == m_template)) {
m_template =
this.getStylesheetRoot().getTemplateComposed(m_templateName);
if (null == m_template) {
String themsg =
XSLMessages.createMessage(
XSLTErrorResources.ER_ELEMTEMPLATEELEM_ERR,
new Object[] { m_templateName });
throw new TransformerException(themsg, this);
//"Could not find template named: '"+templateName+"'");
}
length = getParamElemCount();
for (int i = 0; i < length; i++)
{
ElemWithParam ewp = getParamElem(i);
ewp.m_index = -1;
// Find the position of the param in the template being called,
// and set the index of the param slot.
int etePos = 0;
for (ElemTemplateElement ete = m_template.getFirstChildElem();
null != ete; ete = ete.getNextSiblingElem())
{
if(ete.getXSLToken() == Constants.ELEMNAME_PARAMVARIABLE)
{
ElemParam ep = (ElemParam)ete;
if(ep.getName().equals(ewp.getName()))
{
ewp.m_index = etePos;
}
}
else
break;
etePos++;
}
}
}
}
/**
* This after the template's children have been composed.
*/
public void endCompose(StylesheetRoot sroot) throws TransformerException
{
int length = getParamElemCount();
for (int i = 0; i < length; i++)
{
ElemWithParam ewp = getParamElem(i);
ewp.endCompose(sroot);
}
super.endCompose(sroot);
}
/**
* Invoke a named template.
* @see <a href="http://www.w3.org/TR/xslt#named-templates">named-templates in XSLT Specification</a>
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
public void execute(
TransformerImpl transformer)
throws TransformerException
{
if (transformer.getDebug())
transformer.getTraceManager().fireTraceEvent(this);
if (null != m_template)
{
XPathContext xctxt = transformer.getXPathContext();
VariableStack vars = xctxt.getVarStack();
int thisframe = vars.getStackFrame();
int nextFrame = vars.link(m_template.m_frameSize);
// We have to clear the section of the stack frame that has params
// so that the default param evaluation will work correctly.
if(m_template.m_inArgsSize > 0)
{
vars.clearLocalSlots(0, m_template.m_inArgsSize);
if(null != m_paramElems)
{
int currentNode = xctxt.getCurrentNode();
vars.setStackFrame(thisframe);
int size = m_paramElems.length;
for (int i = 0; i < size; i++)
{
ElemWithParam ewp = m_paramElems[i];
if(ewp.m_index >= 0)
{
if (transformer.getDebug())
transformer.getTraceManager().fireTraceEvent(ewp);
XObject obj = ewp.getValue(transformer, currentNode);
if (transformer.getDebug())
transformer.getTraceManager().fireTraceEndEvent(ewp);
// Note here that the index for ElemWithParam must have been
// statically made relative to the xsl:template being called,
// NOT this xsl:template.
vars.setLocalVariable(ewp.m_index, obj, nextFrame);
}
}
vars.setStackFrame(nextFrame);
}
}
SourceLocator savedLocator = xctxt.getSAXLocator();
try
{
xctxt.setSAXLocator(m_template);
// template.executeChildTemplates(transformer, sourceNode, mode, true);
transformer.pushElemTemplateElement(m_template);
m_template.execute(transformer);
}
finally
{
transformer.popElemTemplateElement();
xctxt.setSAXLocator(savedLocator);
// When we entered this function, the current
// frame buffer (cfb) index in the variable stack may
// have been manually set. If we just call
// unlink(), however, it will restore the cfb to the
// previous link index from the link stack, rather than
// the manually set cfb. So,
// the only safe solution is to restore it back
// to the same position it was on entry, since we're
// really not working in a stack context here. (Bug4218)
vars.unlink(thisframe);
}
}
else
{
transformer.getMsgMgr().error(this, XSLTErrorResources.ER_TEMPLATE_NOT_FOUND,
new Object[]{ m_templateName }); //"Could not find template named: '"+templateName+"'");
}
if (transformer.getDebug())
transformer.getTraceManager().fireTraceEndEvent(this);
}
/** Vector of xsl:param elements associated with this element.
* @serial */
protected ElemWithParam[] m_paramElems = null;
/**
* Get the count xsl:param elements associated with this element.
* @return The number of xsl:param elements.
*/
public int getParamElemCount()
{
return (m_paramElems == null) ? 0 : m_paramElems.length;
}
/**
* Get a xsl:param element associated with this element.
*
* @param i Index of element to find
*
* @return xsl:param element at given index
*/
public ElemWithParam getParamElem(int i)
{
return m_paramElems[i];
}
/**
* Set a xsl:param element associated with this element.
*
* @param ParamElem xsl:param element to set.
*/
public void setParamElem(ElemWithParam ParamElem)
{
if (null == m_paramElems)
{
m_paramElems = new ElemWithParam[1];
m_paramElems[0] = ParamElem;
}
else
{
// Expensive 1 at a time growth, but this is done at build time, so
// I think it's OK.
int length = m_paramElems.length;
ElemWithParam[] ewp = new ElemWithParam[length + 1];
System.arraycopy(m_paramElems, 0, ewp, 0, length);
m_paramElems = ewp;
ewp[length] = ParamElem;
}
}
/**
* Add a child to the child list.
* <!ELEMENT xsl:apply-templates (xsl:sort|xsl:with-param)*>
* <!ATTLIST xsl:apply-templates
* select %expr; "node()"
* mode %qname; #IMPLIED
* >
*
* @param newChild Child to add to this node's children list
*
* @return The child that was just added the children list
*
* @throws DOMException
*/
public ElemTemplateElement appendChild(ElemTemplateElement newChild)
{
int type = ((ElemTemplateElement) newChild).getXSLToken();
if (Constants.ELEMNAME_WITHPARAM == type)
{
setParamElem((ElemWithParam) newChild);
}
// You still have to append, because this element can
// contain a for-each, and other elements.
return super.appendChild(newChild);
}
/**
* Call the children visitors.
* @param visitor The visitor whose appropriate method will be called.
*/
public void callChildVisitors(XSLTVisitor visitor, boolean callAttrs)
{
// if (null != m_paramElems)
// {
// int size = m_paramElems.length;
//
// for (int i = 0; i < size; i++)
// {
// ElemWithParam ewp = m_paramElems[i];
// ewp.callVisitors(visitor);
// }
// }
super.callChildVisitors(visitor, callAttrs);
}
}