/*
 * Copyright 2006 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.cli;

import java.io.File;
import java.io.OutputStream;
import java.util.Vector;

import javax.xml.transform.Result;
import javax.xml.transform.sax.SAXResult;

import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.area.AreaTreeModel;
import org.apache.fop.area.AreaTreeParser;
import org.apache.fop.area.RenderPagesModel;
import org.apache.fop.fonts.FontInfo;
import org.xml.sax.SAXException;

/**
 * InputHandler for the area tree XML (intermediate format) as input.
 */
public class AreaTreeInputHandler extends InputHandler {

    /**
     * Constructor for XML->XSLT->area tree XML input
     * @param xmlfile XML file
     * @param xsltfile XSLT file
     * @param params Vector of command-line parameters (name, value, 
     *      name, value, ...) for XSL stylesheet, null if none
     */
    public AreaTreeInputHandler(File xmlfile, File xsltfile, Vector params) {
        super(xmlfile, xsltfile, params);
    }

    /**
     * Constructor for area tree XML input
     * @param atfile the file to read the area tree document.
     */
    public AreaTreeInputHandler(File atfile) {
        super(atfile);
    }

    /** @see org.apache.fop.cli.InputHandler */
    public void renderTo(FOUserAgent userAgent, String outputFormat, OutputStream out) 
                throws FOPException {
        FontInfo fontInfo = new FontInfo();
        FOUserAgent effUserAgent = userAgent;
        if (effUserAgent == null) {
            effUserAgent = new FOUserAgent();
        }
        AreaTreeModel treeModel = new RenderPagesModel(userAgent, 
                outputFormat, fontInfo, out);
        
        //Iterate over all intermediate files
        AreaTreeParser parser = new AreaTreeParser();
        
        // Resulting SAX events (the generated FO) must be piped through to FOP
        Result res = new SAXResult(parser.getContentHandler(treeModel, userAgent));

        transformTo(res);
        
        try {
            treeModel.endDocument();
        } catch (SAXException e) {
            throw new FOPException(e);
        }
    }

}