| /* |
| * 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: ExtensionNamespaceSupport.java 468637 2006-10-28 06:51:02Z minchau $ |
| */ |
| package org.apache.xalan.extensions; |
| |
| import java.lang.reflect.Constructor; |
| |
| import javax.xml.transform.TransformerException; |
| |
| /** |
| * During styleseet composition, an ExtensionNamespaceSupport object is created for each extension |
| * namespace the stylesheet uses. At the beginning of a transformation, TransformerImpl generates |
| * an ExtensionHandler for each of these objects and adds an entry to the ExtensionsTable hashtable. |
| */ |
| public class ExtensionNamespaceSupport |
| { |
| // Namespace, ExtensionHandler class name, constructor signature |
| // and arguments. |
| String m_namespace = null; |
| String m_handlerClass = null; |
| Class [] m_sig = null; |
| Object [] m_args = null; |
| |
| public ExtensionNamespaceSupport(String namespace, |
| String handlerClass, |
| Object[] constructorArgs) |
| { |
| m_namespace = namespace; |
| m_handlerClass = handlerClass; |
| m_args = constructorArgs; |
| // Create the constructor signature. |
| m_sig = new Class[m_args.length]; |
| for (int i = 0; i < m_args.length; i++) |
| { |
| if (m_args[i] != null) |
| m_sig[i] = m_args[i].getClass();//System.out.println("arg class " + i + " " +m_sig[i]); |
| else // If an arguments is null, pick the constructor later. |
| { |
| m_sig = null; |
| break; |
| } |
| } |
| } |
| |
| public String getNamespace() |
| { |
| return m_namespace; |
| } |
| |
| /** |
| * Launch the ExtensionHandler that this ExtensionNamespaceSupport object defines. |
| */ |
| public ExtensionHandler launch() |
| throws TransformerException |
| { |
| ExtensionHandler handler = null; |
| try |
| { |
| Class cl = ExtensionHandler.getClassForName(m_handlerClass); |
| Constructor con = null; |
| //System.out.println("class " + cl + " " + m_args + " " + m_args.length + " " + m_sig); |
| if (m_sig != null) |
| con = cl.getConstructor(m_sig); |
| else // Pick the constructor based on number of args. |
| { |
| Constructor[] cons = cl.getConstructors(); |
| for (int i = 0; i < cons.length; i ++) |
| { |
| if (cons[i].getParameterTypes().length == m_args.length) |
| { |
| con = cons[i]; |
| break; |
| } |
| } |
| } |
| // System.out.println("constructor " + con); |
| if (con != null) |
| handler = (ExtensionHandler)con.newInstance(m_args); |
| else |
| throw new TransformerException("ExtensionHandler constructor not found"); |
| } |
| catch (Exception e) |
| { |
| throw new TransformerException(e); |
| } |
| return handler; |
| } |
| |
| } |