/*
* 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: ElemExtensionCall.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import javax.xml.transform.TransformerException;
import org.apache.xalan.extensions.ExtensionHandler;
import org.apache.xalan.extensions.ExtensionsTable;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xpath.XPathContext;
import org.xml.sax.SAXException;
/**
* Implement an extension element.
* @see <a href="http://www.w3.org/TR/xslt#extension-element">extension-element in XSLT Specification</a>
* @xsl.usage advanced
*/
public class ElemExtensionCall extends ElemLiteralResult
{
static final long serialVersionUID = 3171339708500216920L;
/** The Namespace URI for this extension call element.
* @serial */
String m_extns;
/** Language used by extension.
* @serial */
String m_lang;
/** URL pointing to extension.
* @serial */
String m_srcURL;
/** Source for script.
* @serial */
String m_scriptSrc;
/** Declaration for Extension element.
* @serial */
ElemExtensionDecl m_decl = 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_EXTENSIONCALL;
}
/**
* Return the node name.
*
* @return The element's name
*/
// public String getNodeName()
// {
// TODO: Need prefix.
// return localPart;
// }
/**
* 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);
m_extns = this.getNamespace();
m_decl = getElemExtensionDecl(sroot, m_extns);
// Register the extension namespace if the extension does not have
// an ElemExtensionDecl ("component").
if (m_decl == null)
sroot.getExtensionNamespacesManager().registerExtension(m_extns);
}
/**
* Return the ElemExtensionDecl for this extension element
*
*
* @param stylesheet Stylesheet root associated with this extension element
* @param namespace Namespace associated with this extension element
*
* @return the ElemExtensionDecl for this extension element.
*/
private ElemExtensionDecl getElemExtensionDecl(StylesheetRoot stylesheet,
String namespace)
{
ElemExtensionDecl decl = null;
int n = stylesheet.getGlobalImportCount();
for (int i = 0; i < n; i++)
{
Stylesheet imported = stylesheet.getGlobalImport(i);
for (ElemTemplateElement child = imported.getFirstChildElem();
child != null; child = child.getNextSiblingElem())
{
if (Constants.ELEMNAME_EXTENSIONDECL == child.getXSLToken())
{
decl = (ElemExtensionDecl) child;
String prefix = decl.getPrefix();
String declNamespace = child.getNamespaceForPrefix(prefix);
if (namespace.equals(declNamespace))
{
return decl;
}
}
}
}
return null;
}
/**
* Execute the fallbacks when an extension is not available.
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
private void executeFallbacks(
TransformerImpl transformer)
throws TransformerException
{
for (ElemTemplateElement child = m_firstChild; child != null;
child = child.m_nextSibling)
{
if (child.getXSLToken() == Constants.ELEMNAME_FALLBACK)
{
try
{
transformer.pushElemTemplateElement(child);
((ElemFallback) child).executeFallback(transformer);
}
finally
{
transformer.popElemTemplateElement();
}
}
}
}
/**
* Return true if this extension element has a <xsl:fallback> child element.
*
* @return true if this extension element has a <xsl:fallback> child element.
*/
private boolean hasFallbackChildren()
{
for (ElemTemplateElement child = m_firstChild; child != null;
child = child.m_nextSibling)
{
if (child.getXSLToken() == Constants.ELEMNAME_FALLBACK)
return true;
}
return false;
}
/**
* Execute an extension.
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
public void execute(TransformerImpl transformer)
throws TransformerException
{
if (transformer.getStylesheet().isSecureProcessing())
throw new TransformerException(
XSLMessages.createMessage(
XSLTErrorResources.ER_EXTENSION_ELEMENT_NOT_ALLOWED_IN_SECURE_PROCESSING,
new Object[] {getRawName()}));
try
{
transformer.getResultTreeHandler().flushPending();
ExtensionsTable etable = transformer.getExtensionsTable();
ExtensionHandler nsh = etable.get(m_extns);
if (null == nsh)
{
if (hasFallbackChildren())
{
executeFallbacks(transformer);
}
else
{
TransformerException te = new TransformerException(XSLMessages.createMessage(
XSLTErrorResources.ER_CALL_TO_EXT_FAILED, new Object[]{getNodeName()}));
transformer.getErrorListener().fatalError(te);
}
return;
}
try
{
nsh.processElement(this.getLocalName(), this, transformer,
getStylesheet(), this);
}
catch (Exception e)
{
if (hasFallbackChildren())
executeFallbacks(transformer);
else
{
if(e instanceof TransformerException)
{
TransformerException te = (TransformerException)e;
if(null == te.getLocator())
te.setLocator(this);
transformer.getErrorListener().fatalError(te);
}
else if (e instanceof RuntimeException)
{
transformer.getErrorListener().fatalError(new TransformerException(e));
}
else
{
transformer.getErrorListener().warning(new TransformerException(e));
}
}
}
}
catch(TransformerException e)
{
transformer.getErrorListener().fatalError(e);
}
catch(SAXException se) {
throw new TransformerException(se);
}
}
/**
* Return the value of the attribute interpreted as an Attribute
* Value Template (in other words, you can use curly expressions
* such as href="http://{website}".
*
* @param rawName Raw name of the attribute to get
* @param sourceNode non-null reference to the <a href="http://www.w3.org/TR/xslt#dt-current-node">current source node</a>.
* @param transformer non-null reference to the the current transform-time state.
*
* @return the value of the attribute
*
* @throws TransformerException
*/
public String getAttribute(
String rawName, org.w3c.dom.Node sourceNode, TransformerImpl transformer)
throws TransformerException
{
AVT avt = getLiteralResultAttribute(rawName);
if ((null != avt) && avt.getRawName().equals(rawName))
{
XPathContext xctxt = transformer.getXPathContext();
return avt.evaluate(xctxt,
xctxt.getDTMHandleFromNode(sourceNode),
this);
}
return null;
}
/**
* Accept a visitor and call the appropriate method
* for this class.
*
* @param visitor The visitor whose appropriate method will be called.
* @return true if the children of the object should be visited.
*/
protected boolean accept(XSLTVisitor visitor)
{
return visitor.visitExtensionElement(this);
}
}