| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999-2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 1999, Lotus |
| * Development Corporation., http://www.lotus.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| package org.apache.xpath.compiler; |
| |
| import javax.xml.transform.TransformerException; |
| |
| |
| import org.apache.xpath.functions.Function; |
| |
| /** |
| * Lazy load of functions into the function table as needed, so we don't |
| * have to load all the functions allowed in XPath and XSLT on startup. |
| * @xsl.usage advanced |
| */ |
| public class FuncLoader |
| { |
| |
| /** The function ID, which may correspond to one of the FUNC_XXX values |
| * found in {@link org.apache.xpath.compiler.FunctionTable}, but may |
| * be a value installed by an external module. */ |
| private int m_funcID; |
| |
| /** The class name of the function. Must not be null. */ |
| private String m_funcName; |
| |
| /** |
| * Get the local class name of the function class. If function name does |
| * not have a '.' in it, it is assumed to be relative to |
| * 'org.apache.xpath.functions'. |
| * |
| * @return The class name of the {org.apache.xpath.functions.Function} class. |
| */ |
| public String getName() |
| { |
| return m_funcName; |
| } |
| |
| /** |
| * Construct a function loader |
| * |
| * @param funcName The class name of the {org.apache.xpath.functions.Function} |
| * class, which, if it does not have a '.' in it, is assumed to |
| * be relative to 'org.apache.xpath.functions'. |
| * @param funcID The function ID, which may correspond to one of the FUNC_XXX |
| * values found in {@link org.apache.xpath.compiler.FunctionTable}, but may |
| * be a value installed by an external module. |
| */ |
| public FuncLoader(String funcName, int funcID) |
| { |
| |
| super(); |
| |
| m_funcID = funcID; |
| m_funcName = funcName; |
| } |
| |
| /** |
| * Get a Function instance that this instance is liaisoning for. |
| * |
| * @return non-null reference to Function derivative. |
| * |
| * @throws javax.xml.transform.TransformerException if ClassNotFoundException, |
| * IllegalAccessException, or InstantiationException is thrown. |
| */ |
| public Function getFunction() throws TransformerException |
| { |
| try |
| { |
| String className = m_funcName; |
| if (className.indexOf(".") < 0) { |
| className = "org.apache.xpath.functions." + className; |
| } |
| |
| return (Function) ObjectFactory.newInstance( |
| className, ObjectFactory.findClassLoader(), true); |
| } |
| catch (ObjectFactory.ConfigurationError e) |
| { |
| throw new TransformerException(e.getException()); |
| } |
| } |
| } |