/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 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.xalan.xpath;
import java.lang.Class;
import java.util.Vector;
import org.w3c.dom.*;
import org.apache.xalan.xpath.res.XPATHErrorResources;
/**
* <meta name="usage" content="advanced"/>
* Load functions in function table as needed
*/
public class FuncLoader extends Function
{
private int m_funcID;
private String m_funcName, test;
public FuncLoader(String funcName, int funcID)
{
super();
m_funcID = funcID;
m_funcName = funcName;
}
/**
* Replace the current function (us) in the table with
* the actual function the call the function's execute method.
* @param path The executing xpath.
* @param context The current context.
* @param opPos The current op position.
* @param args A list of XObject arguments.
* @return A valid XObject.
*/
public XObject execute(XPath path, XPathSupport execContext, Node context, int opPos, Vector args)
throws org.xml.sax.SAXException
{
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;
function = Class.forName(classname);
}
else
function = Class.forName(m_funcName);
Function func = (Function)function.newInstance();
path.installFunction(m_funcName, m_funcID, func);
return func.execute(path, execContext, context, opPos, args);
}
catch(ClassNotFoundException e)
{
e.printStackTrace();
path.error(XPATHErrorResources.ER_COULDNOT_FIND_FUNCTION, new Object[] {m_funcName});
return null;
}
catch(IllegalAccessException e)
{
e.printStackTrace();
path.error(XPATHErrorResources.ER_COULDNOT_FIND_FUNCTION, new Object[] {m_funcName});
return null;
}
catch(InstantiationException e)
{
e.printStackTrace();
path.error(XPATHErrorResources.ER_COULDNOT_FIND_FUNCTION, new Object[] {m_funcName});
return null;
}
}
}