/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2001 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 acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * 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.  For more
 * information on the Apache Software Foundation, please see
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 */

package org.apache.tools.ant.taskdefs.optional;

import com.kvisco.xsl.XSLProcessor;
import com.kvisco.xsl.XSLReader;
import com.kvisco.xsl.XSLStylesheet;
import org.apache.tools.ant.taskdefs.XSLTLiaison;
import org.apache.tools.ant.BuildException;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;




/**
 * Concrete liaison for XSLP
 *
 * @author <a href="mailto:rubys@us.ibm.com">Sam Ruby</a>
 * @author <a href="mailto:sbailliez@apache.org">Stephane Bailliez</a>
 */
public class XslpLiaison implements XSLTLiaison {

    protected XSLProcessor processor;
    protected XSLStylesheet xslSheet;

    public XslpLiaison() {
      processor = new XSLProcessor();
      // uh ?! I'm forced to do that otherwise a setProperty crashes with NPE !
      // I don't understand why the property map is static though...
      // how can we do multithreading w/ multiple identical parameters ?
      processor.getProperty("dummy-to-init-properties-map");
    }

    public void setStylesheet(File fileName) throws Exception {
      XSLReader xslReader = new XSLReader();
      // a file:/// + getAbsolutePath() does not work here
      // it is really the pathname
      xslSheet = xslReader.read( fileName.getAbsolutePath() );
    }

    public void transform(File infile, File outfile) throws Exception {
        FileOutputStream fos = new FileOutputStream(outfile);
        // XSLP does not support encoding...we're in hot water.
        OutputStreamWriter out = new OutputStreamWriter(fos,"UTF8");
        processor.process(infile.getAbsolutePath(), xslSheet, out);
    }

    public void addParam(String name, String expression){
      processor.setProperty(name, expression);
    }

    public void setOutputtype(String type) throws Exception {
        if (!type.equals("xml")) { 
            throw new BuildException("Unsupported output type: " + type);
        }
    }

} //-- XSLPLiaison
