CanWriteSequence.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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import java.io.File;
import java.io.FileOutputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.IIORegistry;
import javax.imageio.spi.ImageWriterSpi;
import javax.imageio.stream.ImageOutputStream;

/**
 * @test
 * @bug 4958064
 * @author Sergey Bylokhov
 */
public final class CanWriteSequence {

    public static void main(final String[] args) throws Exception {
        final IIORegistry registry = IIORegistry.getDefaultInstance();
        final Iterator<ImageWriterSpi> iter =
                registry.getServiceProviders(ImageWriterSpi.class,
                        provider -> true, true);
        // Validates all supported ImageWriters
        while (iter.hasNext()) {
            final ImageWriter writer = iter.next().createWriterInstance();
            System.out.println("ImageWriter = " + writer);
            test(writer);
        }
        System.out.println("Test passed");
    }

    private static void test(final ImageWriter writer) throws Exception {
        final File file = File.createTempFile("temp", ".img");
        file.deleteOnExit();
        final FileOutputStream fos = new FileOutputStream(file);
        final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
        writer.setOutput(ios);
        final IIOMetadata data = writer.getDefaultStreamMetadata(null);

        if (writer.canWriteSequence()) {
            writer.prepareWriteSequence(data);
        } else {
            try {
                writer.prepareWriteSequence(data);
                throw new RuntimeException(
                        "UnsupportedOperationException was not thrown");
            } catch (final UnsupportedOperationException ignored) {
                // expected
            }
        }
        writer.dispose();
        ios.close();
    }
}