package drawmaptiles;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

/**
 *
 * https://bugs.openjdk.java.net/browse/JDK-6967419
 */
public class DrawMapTiles {
    public static void main(String[] args) throws IOException {
        OutputStream os = new NullOutputStream();

        ImageOutputStream ios = ImageIO.createImageOutputStream(os);

        System.out.println("ios: " + ios);

        System.out.println("write big image...");
        System.out.flush();
        try {
            ImageIO.write(createImage(2048),"PNG", ios);
        } catch (IOException e) {
            ios.close();
        }
    }

    private static BufferedImage createImage(int s) {
        BufferedImage i = new BufferedImage(s, s, BufferedImage.TYPE_3BYTE_BGR);
        Graphics2D g = i.createGraphics();
        g.setPaint(new GradientPaint(0, 0, Color.blue, s, s, Color.red));
        g.fillRect(0, 0, s, s);
        g.dispose();

        return i;
    }

    static class NullOutputStream extends OutputStream {
        long count = 0;
        @Override
        public void write(int b) throws IOException {
            count++;
            if (count > 30000L) {
                System.out.println("throw an exception on " + count);
                throw new IOException("Unable to write!");
            }

        }
    }
}