fine-third/fine-jai/src/main/java/com/fr/third/JAI/JPEGCodec.java

package com.fr.third.JAI;
/*
 * Copyright (c) 2001 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * -Redistributions of source code must retain the above copyright notice, this 
 * list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduct the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that Software is not designed,licensed or intended for use in 
 * the design, construction, operation or maintenance of any nuclear facility.
 */

import java.awt.image.RenderedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 */
public final class JPEGCodec extends ImageCodec {

    public JPEGCodec() {}

    public String getFormatName() {
        return "jpeg";
    }

    public Class getEncodeParamClass() {
        return JPEGEncodeParam.class;
    }

    public Class getDecodeParamClass() {
        return JPEGDecodeParam.class;
    }

    public boolean canEncodeImage(RenderedImage im,
                                  ImageEncodeParam param) {
        return true;
    }

    protected ImageEncoder createImageEncoder(OutputStream dst,
                                              ImageEncodeParam param) {
        JPEGEncodeParam p = null;
        if (param != null) {
            p = (JPEGEncodeParam)param;
        }

        return new JPEGImageEncoder(dst, p);
    }

    protected ImageDecoder createImageDecoder(InputStream src,
                                              ImageDecodeParam param) {
        return new JPEGImageDecoder(src, param);
    }

    protected ImageDecoder createImageDecoder(File src,
                                              ImageDecodeParam param) 
        throws IOException {
        return new JPEGImageDecoder(new FileInputStream(src), param);
    }

    protected ImageDecoder createImageDecoder(SeekableStream src,
                                              ImageDecodeParam param) {
        return new JPEGImageDecoder(src, param);
    }

    public int getNumHeaderBytes() {
        return 3;
    }

    public boolean isFormatRecognized(byte[] header) {
        return ((header[0] == (byte)0xff) &&
                (header[1] == (byte)0xd8) &&
                (header[2] == (byte)0xff));
    }
}