| /* |
| * 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 <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 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); |
| } |
| } |
| |
| } |