/*
* 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 org.apache.xpath.functions.Function;
/**
* <meta name="usage" content="advanced"/>
* 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.
*/
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 javax.xml.transform.TransformerException
{
try
{
Class function;
// first get package name if necessary
if (m_funcName.indexOf(".") < 0)
{
// String thisName = this.getClass().getName();
// int lastdot = thisName.lastIndexOf(".");
// String classname = thisName.substring(0,lastdot+1) + m_funcName;
String classname = "org.apache.xpath.functions." + m_funcName;
function = Class.forName(classname);
}
else
function = Class.forName(m_funcName);
Function func = (Function) function.newInstance();
return func;
}
catch (ClassNotFoundException e)
{
throw new javax.xml.transform.TransformerException(e);
}
catch (IllegalAccessException e)
{
throw new javax.xml.transform.TransformerException(e);
}
catch (InstantiationException e)
{
throw new javax.xml.transform.TransformerException(e);
}
}
}