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/*
 * 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: ElemFallback.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 xsl:fallback.
 * 
 * 
 * 
 * 
* @see fallback in XSLT Specification * @xsl.usage advanced */ public class ElemFallback extends ElemTemplateElement { static final long serialVersionUID = 1782962139867340703L; /** * 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_FALLBACK; } /** * Return the node name. * * @return The Element's name */ public String getNodeName() { return Constants.ELEMNAME_FALLBACK_STRING; } /** * This is the normal call when xsl:fallback is instantiated. * In accordance with the XSLT 1.0 Recommendation, chapter 15, * "Normally, instantiating an xsl:fallback element does nothing." * * @param transformer non-null reference to the the current transform-time state. * * @throws TransformerException */ public void execute( TransformerImpl transformer) throws TransformerException { } /** * Execute the fallback elements. This must be explicitly called to * instantiate the content of an xsl:fallback element. * When an XSLT transformer performs fallback for an instruction * element, if the instruction element has one or more xsl:fallback * children, then the content of each of the xsl:fallback children * must be instantiated in sequence; otherwise, an error must * be signaled. The content of an xsl:fallback element is a template. * * @param transformer non-null reference to the the current transform-time state. * * @throws TransformerException */ public void executeFallback( TransformerImpl transformer) throws TransformerException { int parentElemType = m_parentNode.getXSLToken(); if (Constants.ELEMNAME_EXTENSIONCALL == parentElemType || Constants.ELEMNAME_UNDEFINED == parentElemType) { transformer.executeChildTemplates(this, true); } else { // Should never happen System.out.println( "Error! parent of xsl:fallback must be an extension or unknown element!"); } } }




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