| /* |
| * 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. |
| */ |
| |
| package org.apache.xalan.extensions; |
| |
| import java.util.List; |
| import java.util.Vector; |
| |
| import javax.xml.transform.TransformerException; |
| import javax.xml.xpath.XPathFunction; |
| import javax.xml.xpath.XPathFunctionException; |
| |
| /** |
| * A sample implementation of XPathFunction, with support for |
| * EXSLT extension functions and Java extension functions. |
| */ |
| public class XPathFunctionImpl implements XPathFunction |
| { |
| private ExtensionHandler m_handler; |
| private String m_funcName; |
| |
| /** |
| * Construct an instance of XPathFunctionImpl from the |
| * ExtensionHandler and function name. |
| */ |
| public XPathFunctionImpl(ExtensionHandler handler, String funcName) |
| { |
| m_handler = handler; |
| m_funcName = funcName; |
| } |
| |
| /** |
| * @see javax.xml.xpath.XPathFunction#evaluate(java.util.List) |
| */ |
| public Object evaluate(List args) |
| throws XPathFunctionException |
| { |
| Vector argsVec = listToVector(args); |
| |
| try { |
| // The method key and ExpressionContext are set to null. |
| return m_handler.callFunction(m_funcName, argsVec, null, null); |
| } |
| catch (TransformerException e) |
| { |
| throw new XPathFunctionException(e); |
| } |
| } |
| |
| /** |
| * Convert a java.util.List to a java.util.Vector. |
| * No conversion is done if the List is already a Vector. |
| */ |
| private static Vector listToVector(List args) |
| { |
| if (args == null) |
| return null; |
| else if (args instanceof Vector) |
| return (Vector)args; |
| else |
| { |
| Vector result = new Vector(); |
| result.addAll(args); |
| return result; |
| } |
| } |
| } |