Package org.apache.harmony.x.imageio.plugins.jpeg

Source Code of org.apache.harmony.x.imageio.plugins.jpeg.JPEGImageReader

/*
*  Licensed to the Apache Software Foundation (ASF) under one or more
*  contributor license agreements.  See the NOTICE file distributed with
*  this work for additional information regarding copyright ownership.
*  The ASF licenses this file to You 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.
*/
/**
* @author Rustem V. Rafikov
* @version $Revision: 1.4 $
*/
package org.apache.harmony.x.imageio.plugins.jpeg;


import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;

import org.apache.harmony.awt.gl.image.DecodingImageSource;
import org.apache.harmony.awt.gl.image.OffscreenImage;

import java.io.IOException;
import java.util.Iterator;
import java.awt.image.BufferedImage;

/**
* This implementation uses org.apache.harmony.awt.gl.image.JpegDecoder to read
* an image. The only implemented method is read(..);
*
* TODO: Implements generic decoder to be used by javad2 and imageio
*
* @see org.apache.harmony.awt.gl.image.JpegDecoder
* @see org.apache.harmony.x.imageio.plugins.jpeg.IISDecodingImageSource
*/
public class JPEGImageReader extends ImageReader {

    ImageInputStream iis;

    public JPEGImageReader(ImageReaderSpi imageReaderSpi) {
        super(imageReaderSpi);
    }

    @Override
    public int getHeight(int i) throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public int getWidth(int i) throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public int getNumImages(boolean b) throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public Iterator<ImageTypeSpecifier> getImageTypes(int i) throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public IIOMetadata getStreamMetadata() throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public IIOMetadata getImageMetadata(int i) throws IOException {
        //-- TODO imlement
        throw new UnsupportedOperationException("not implemented yet");
    }

    @Override
    public BufferedImage read(int i, ImageReadParam imageReadParam) throws IOException {
        if (iis == null) {
            throw new IllegalArgumentException("input stream == null");
        }

        DecodingImageSource source = new IISDecodingImageSource(iis);
        OffscreenImage image = new OffscreenImage(source);
        source.addConsumer(image);
        source.load();
        return image.getBufferedImage();
    }

    @Override
    public BufferedImage read(int i) throws IOException {
        return read(i, null);
    }

    @Override
    public void setInput(Object input, boolean seekForwardOnly, boolean ignoreMetadata) {
        super.setInput(input, seekForwardOnly, ignoreMetadata);
        iis = (ImageInputStream) input;
    }
}
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