org.apache.xalan.templates.ElemUnknown Maven / Gradle / Ivy
/*
* 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: ElemUnknown.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import javax.xml.transform.TransformerException;
import org.apache.xalan.transformer.TransformerImpl;
/**
* Implement an unknown element
* @xsl.usage advanced
*/
public class ElemUnknown extends ElemLiteralResult
{
static final long serialVersionUID = -4573981712648730168L;
/**
* 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_UNDEFINED;
}
/**
* 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 child element.
*
* @return true if this extension element has a 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 unknown element.
* Execute fallback if fallback child exists or do nothing
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
public void execute(TransformerImpl transformer)
throws TransformerException
{
try {
if (hasFallbackChildren()) {
executeFallbacks(transformer);
} else {
// do nothing
}
} catch (TransformerException e) {
transformer.getErrorListener().fatalError(e);
}
}
}