// XAAL toolkit
// Copyright (C) 2009 Ville Karavirta <vkaravir(a)cs.hut.fi>
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
package xaal.adapters;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;

import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import xaal.objects.Xaal;

/**
 * This Adapter can be used if you have an XSL stylesheet that converts
 * Xaal to some other format. By giving the stylesheet as a source the
 * given Xaal Objects hierarchy is first adapted to Xaal XML and then
 * the stylesheet is applied.
 * @author vkaravir
 */
public class XSLAdapter {

    /**
     * Applies the given stylesheet to an XML adaptation of the given Xaal
     * object hierarchy and writes the result to the given Writer.
     * 
     * @param xaal The root of the Xaal object hierarchy.
     * @param style The stylesheet to be applied.
     * @param out The output Writer that the result is written to.
     */
    public static void adapt(Xaal xaal, Source style, OutputStream out) {
        try {
            FileOutputStream fos = new FileOutputStream(System.getProperty("java.io.tmpdir") + File.separatorChar + "xaal.tmp");
            new XaalObjects2XaalXML().adapt(xaal, fos);
            fos.flush();
            fos.close();
            Transformer trans = TransformerFactory.newInstance().newTransformer(style);
            StreamSource source = new StreamSource(new FileReader(System.getProperty("java.io.tmpdir") + File.separatorChar + "xaal.tmp"));
            StreamResult result = new StreamResult(out);
            trans.transform(source, result);
        } catch (TransformerConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerFactoryConfigurationError e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       
    }
}