Examples of javax.imageio.ImageWriter.canWriteSequence()

javax.imageio.ImageWriter.canWriteSequence()
Returns true if the writer is able to append an image to an image stream that already contains header information and possibly prior images.
If canWriteSequence returns false, writeToSequence and endWriteSequence will throw an UnsupportedOperationException.
The default implementation returns false. @return true if images may be appended sequentially.

        Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByFormatName(imageType.getFormatName());


        while (imageWriters.hasNext()) {
            ImageWriter imageWriter = imageWriters.next();


            if (imageWriter.canWriteSequence()) {
                return imageWriter;
            }
        }


        throw new IllegalArgumentException(MessageFormat.format("Cannot find sequence-capable image writer for {0} format",

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        try {
            imageOut = ImageIO.createImageOutputStream(os);
            Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("GIF");
            while (writers.hasNext()) {
                writer = writers.next();
                if (writer.canWriteSequence()) {
                    break;
                }
            }


            if (writer == null || !writer.canWriteSequence()) {

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                if (writer.canWriteSequence()) {
                    break;
                }
            }


            if (writer == null || !writer.canWriteSequence()) {
                throw new IllegalStateException("No GIF writer matched");
            }


            writer.setOutput(imageOut);

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