fine-third/fine-jai/src/main/java/com/fr/third/JAI/ImageEncoderImpl.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
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 * 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.ColorModel;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.io.OutputStream;

/**
 * A partial implementation of the ImageEncoder interface useful for
 * subclassing.
 *
 * <p><b> This class is not a committed part of the JAI API.  It may
 * be removed or changed in future releases of JAI.</b>
 */
public abstract class ImageEncoderImpl implements ImageEncoder {
    
    /** The OutputStream associcted with this ImageEncoder. */
    protected OutputStream output;

    /** The ImageEncodeParam object associcted with this ImageEncoder. */
    protected ImageEncodeParam param;

    /**
     * Constructs an ImageEncoderImpl with a given OutputStream
     * and ImageEncoderParam instance.
     */
    public ImageEncoderImpl(OutputStream output,
                            ImageEncodeParam param) {
        this.output = output;
        this.param = param;
    }

    /**
     * Returns the current parameters as an instance of the
     * ImageEncodeParam interface.  Concrete implementations of this
     * interface will return corresponding concrete implementations of
     * the ImageEncodeParam interface.  For example, a JPEGImageEncoder
     * will return an instance of JPEGEncodeParam.
     */
    public ImageEncodeParam getParam() {
        return param;
    }

    /**
     * Sets the current parameters to an instance of the 
     * ImageEncodeParam interface.  Concrete implementations
     * of ImageEncoder may throw a RuntimeException if the
     * params argument is not an instance of the appropriate
     * subclass or subinterface.  For example, a JPEGImageEncoder
     * will expect param to be an instance of JPEGEncodeParam.
     */
    public void setParam(ImageEncodeParam param) {
        this.param = param;
    }

    /** Returns the OutputStream associated with this ImageEncoder. */
    public OutputStream getOutputStream() {
        return output;
    }
    
    /**
     * Encodes a Raster with a given ColorModel and writes the output
     * to the OutputStream associated with this ImageEncoder.
     */
    public void encode(Raster ras, ColorModel cm) throws IOException {
        RenderedImage im = new SingleTileRenderedImage(ras, cm);
        encode(im);
    }

    /**
     * Encodes a RenderedImage and writes the output to the
     * OutputStream associated with this ImageEncoder.
     */
    public abstract void encode(RenderedImage im) throws IOException;
}