fopadapter.java

java编写的OCR软件

package de.spieleck.helper;

import java.io.OutputStream;
import java.util.Set;

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

import org.apache.fop.apps.Driver;

import gnu.trove.TObjectIntHashMap;
import gnu.trove.decorator.TObjectIntHashMapDecorator;

/**
 * Utility class to provide JAXP Results which route XML into Apache-FOP.
 * @author fsn
 */
public class FopAdapter
{
    /** A map of mime types which can be handled by Apache-FOP */
    final private static TObjectIntHashMap mime4fop;
    private static boolean isFopAvailable;

    static
    {
        mime4fop = new TObjectIntHashMap();
        // Try to check weather fop is available in classpath.
        try
        {
            new Driver();
            isFopAvailable = true;
        }
        catch ( Throwable e )
        {
            isFopAvailable = false;
        }
        if ( isFopAvailable )
        {
            mime4fop.put("application/pdf", Driver.RENDER_PDF);
            mime4fop.put("application/ps", Driver.RENDER_PS);
            mime4fop.put("application/mif", Driver.RENDER_MIF); // mime ok?
            mime4fop.put("application/svg", Driver.RENDER_SVG); // mime ok?
            mime4fop.put("experimental/pcl", Driver.RENDER_PCL); // is there a mime?
            mime4fop.put("experimental/txt", Driver.RENDER_TXT); // is there a mime?
            mime4fop.put("experimental/xml", Driver.RENDER_XML); // is there a mime?
        }
    }

    /** Do not construct me! */
    private FopAdapter() { }

    /** Check the availabilty of fop at load time. */
    public static boolean isFopAvailable()
    {
        return isFopAvailable;
    }

    /** Check weather Fop will handle this mime type. */
    public static boolean isFopEnabled(String mime)
    {
        return isFopAvailable && mime != null && mime4fop.contains(mime);
    }

    /** Get a Set of available Fop mime types. */
    public static Set getFopMimes()
    {
        return new TObjectIntHashMapDecorator(mime4fop).keySet();
    }

    /**
     * Return a Result when Fop can handle that particular mimetype 
     */
    public static Result getFopResult(String mime, OutputStream out)
    {
        if ( !isFopEnabled(mime) )
            return null;
        Driver fop = new Driver();
        fop.setRenderer(mime4fop.get(mime));
        fop.addElementMapping("org.apache.fop.fo.StandardElementMapping");
        fop.addElementMapping("org.apache.fop.svg.SVGElementMapping");
        fop.setOutputStream(out);
        return new SAXResult(fop.getContentHandler());
    }

}
//
//    Jacson - Text Filtering with Java.
//    Copyright (C) 2002 Frank S. Nestel (nestefan -at- users.sourceforge.net)
//
//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Lesser General Public
//    License as published by the Free Software Foundation; either
//    version 2.1 of the License, or (at your option) any later version.
//
//    This library 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
//    Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public
//    License along with this library; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//