/**
 *#########################################################################
 *
 * A component of the Greenstone Librarian Interface (GLI) application, 
 * part of the Greenstone digital library software suite from the New 
 * Zealand Digital Library Project at the University of Waikato, 
 * New Zealand.
 *
 * Author: Michael Dewsnip 
 *         Greenstone Project, New Zealand Digital Library
 *         University of Waikato
 *         http://www.nzdl.org
 *
 * Copyright (C) 2004 New Zealand Digital Library, University of Waikato
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

import java.io.*;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;

/** Any class that wants to act as the owner of an AppendLineOnlyFileDocument has to implement this.
 * @author Michael Dewsnip, Greenstone Project, New Zealand Digital Library, University of Waikato
 * @version 2.41 final
 */
public class ApplyXSLT
{
    static public void main(String[] args)
    {
	if (args.length < 3) {
	    System.err.println("Usage: ApplyXSLT <Target_language_code> <XSLfile> <XMLfile> [greenstone-major-version-number]");
	    System.exit(1);
	}	

	String major_version = "2"; // defaults to Greenstone 2

	System.setProperty("javax.xml.transform.TransformerFactory",
			   "org.apache.xalan.processor.TransformerFactoryImpl");
	if (args.length >= 4){
	    for(int i = 3; i < args.length; i++) { // 4 to 5 args
		if(args[i].length() > 1) {
		    System.setProperty("GSDLHOME",args[i]);
		} else { // number of chars is 1, assume it's the Greenstone version (2 or 3)
		    major_version = args[i];
		}
	    }
	}

	TransformerFactory t_factory = null;
	try {
	    t_factory = org.apache.xalan.processor.TransformerFactoryImpl.newInstance();
	}
	catch (Exception ex) {	  
	    System.err.println("XMLTransformer() exception " + ex.getMessage());
	    System.exit(1);
	}

	String lang = args[0];
	String stylesheet = args[1];
	String xml_in = args[2];
	//String major_version = (args.length >= 5) ? args[4] : "2"; 
	//System.err.println("**** Greenstone version requested: " + major_version);

	try {
	    // Use the TransformerFactory to process the stylesheet Source and generate a Transformer
	    Transformer transformer = t_factory.newTransformer(new StreamSource(stylesheet));

	    // Use the Transformer to transform an XML Source and send the output to a Result object
	    StreamSource input = (xml_in.equals("-") ? new StreamSource(System.in) : new StreamSource(xml_in));
	    OutputStreamWriter output = new OutputStreamWriter(System.out, "UTF-8");

	    transformer.setParameter("lang", lang);
	    transformer.setParameter("gs-major-version", major_version);
	    transformer.transform(input, new StreamResult(output));
	}
	catch (TransformerConfigurationException ex) {
	    //System.err.println("XMLTransformer: couldn't create transformer object: " + ex.getMessageAndLocation());
	    //System.err.println(ex.getLocationAsString());  
	    ex.printStackTrace();
	    System.exit(1);
	}
	catch (Exception ex) {
	    //System.err.println("XMLTransformer: couldn't transform the source: " + ex.getMessage());
	    ex.printStackTrace();
	    System.exit(1);
	}
    }


    static public String replaceAll(String source_string, String match_regexp, String replace_string)
    {
	return source_string.replaceAll(match_regexp, replace_string);
    }
}