gifimagewriter.java

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package com.blue.imageio.plugins.gif;

import java.awt.image.BufferedImage;
import java.io.DataOutput;
import java.io.IOException;

import javax.imageio.IIOImage;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.stream.ImageOutputStream;

import com.gif4j.GifEncoder;

/**
 * 
 * @author Lucifer
 *
 */
public class GIFImageWriter extends ImageWriter {

	protected GIFImageWriter(GIFImageWriterSpi gifimagewriterspi) {
		super(gifimagewriterspi);
	}

	public IIOMetadata getDefaultStreamMetadata(ImageWriteParam imagewriteparam) {
		return null;
	}

	public IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imagetypespecifier,
			ImageWriteParam imagewriteparam) {
		return null;
	}

	public IIOMetadata convertStreamMetadata(IIOMetadata iiometadata,
			ImageWriteParam imagewriteparam) {
		return null;
	}

	public IIOMetadata convertImageMetadata(IIOMetadata iiometadata,
			ImageTypeSpecifier imagetypespecifier, ImageWriteParam imagewriteparam) {
		return null;
	}

	public void setOutput(Object obj) {
		super.setOutput(obj);
		if (obj != null && !(obj instanceof ImageOutputStream))
			throw new IllegalArgumentException("output not an instance of ImageOutputStream!");
		else
			return;
	}

	public void write(IIOMetadata iiometadata, IIOImage iioimage,
			ImageWriteParam imagewriteparam) throws IOException {
		if (iioimage == null)
			throw new IllegalArgumentException("image is null!");
		java.awt.image.RenderedImage renderedimage = iioimage.getRenderedImage();
		if (getOutput() == null)
			throw new IllegalStateException("output not set and is null!");
		if (iioimage.hasRaster())
			throw new UnsupportedOperationException("Doesn't support Raster-based IIOImage(s)");
		if (!(renderedimage instanceof BufferedImage)) {
			throw new IOException("RenderedImage not an instance of BufferedImage!");
		} else {
			GifEncoder.encode((BufferedImage) renderedimage, (DataOutput) getOutput());
			return;
		}
	}
}