diff -r 4634176c6602 -r 505031965440 java/copy-image-resizer/src/cz/frantovo/copyImageResizer/SingleImageResizer.java
--- a/java/copy-image-resizer/src/cz/frantovo/copyImageResizer/SingleImageResizer.java	Mon Nov 17 21:58:52 2014 +0100
+++ b/java/copy-image-resizer/src/cz/frantovo/copyImageResizer/SingleImageResizer.java	Mon Nov 17 21:59:20 2014 +0100
@@ -17,23 +17,14 @@
  */
 package cz.frantovo.copyImageResizer;
 
-import java.awt.Graphics2D;
-import java.awt.image.BufferedImage;
-import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-import java.util.regex.Pattern;
-import javax.imageio.ImageIO;
 
 /**
  *
  * @author Ing. František Kučera (frantovo.cz)
  */
-public class SingleImageResizer {
-
-	private static final Logger log = Logger.getLogger(SingleImageResizer.class.getName());
+public interface SingleImageResizer {
 
 	/**
 	 *
@@ -46,92 +37,5 @@
 	 * }.
 	 * @throws ResizeException
 	 */
-	public boolean resize(InputStream input, OutputStream output, SizeSpecification size, ImageFormat outputFormat) throws ResizeException {
-		try {
-			BufferedImage image = readImage(input);
-			if (shouldResize(image, size)) {
-				BufferedImage resized = resize(image, size.getWidth(), size.getHeight(), image.getType());
-				ImageIO.write(resized, outputFormat.getFormat(), output);
-				return true;
-			} else {
-				return false;
-			}
-		} catch (IOException e) {
-			throw new ResizeException("Error while resizing image", e);
-		}
-	}
-
-	private BufferedImage resize(BufferedImage original, int maxWidth, int maxHeight, int type) {
-
-		int width;
-		int height;
-		float aspectRatio = (float) original.getWidth() / (float) original.getHeight();
-
-		if (aspectRatio > 1) {
-			width = maxWidth;
-			height = Math.max(Math.round(maxWidth / aspectRatio), 1);
-		} else {
-			width = Math.max(Math.round(maxHeight * aspectRatio), 1);
-			height = maxHeight;
-		}
-
-		if (type == BufferedImage.TYPE_CUSTOM) {
-			log.log(Level.FINER, "Setting default image type: from TYPE_CUSTOM to TYPE_INT_ARGB");
-			type = BufferedImage.TYPE_INT_ARGB;
-		}
-
-		BufferedImage resized = new BufferedImage(width, height, type);
-		Graphics2D g = resized.createGraphics();
-		g.drawImage(original, 0, 0, width, height, null);
-		g.dispose();
-
-		return resized;
-	}
-
-	private static BufferedImage readImage(InputStream input) throws ResizeException {
-		try {
-			return ImageIO.read(input);
-		} catch (IOException e) {
-			throw new ResizeException("Unable to read image from stream", e);
-		}
-	}
-
-	private static boolean shouldResize(BufferedImage input, SizeSpecification requested) {
-		if (requested.isResizeSmaller()) {
-			return input.getHeight() != requested.getHeight() || input.getWidth() != requested.getWidth();
-		} else {
-			return input.getHeight() > requested.getHeight() || input.getWidth() > requested.getWidth();
-		}
-	}
-
-	public static enum ImageFormat {
-
-		JPEG("jpg", Pattern.compile(".*\\.(jpg|jpeg)$", Pattern.CASE_INSENSITIVE)),
-		PNG("png", Pattern.compile(".*\\.png$", Pattern.CASE_INSENSITIVE)),
-		GIF("gif", Pattern.compile(".*\\.gif$", Pattern.CASE_INSENSITIVE));
-
-		private final String format;
-		private final Pattern regex;
-
-		private ImageFormat(String format, Pattern regex) {
-			this.format = format;
-			this.regex = regex;
-		}
-
-		/**
-		 * @return format name for {@linkplain ImageIO#write(java.awt.image.RenderedImage, java.lang.String, java.io.File)
-		 */
-		public String getFormat() {
-			return format;
-		}
-
-		public static ImageFormat getMatching(String fileName) {
-			for (ImageFormat type : values()) {
-				if (type.regex.matcher(fileName).matches()) {
-					return type;
-				}
-			}
-			return null;
-		}
-	}
+	public boolean resize(InputStream input, OutputStream output, SizeSpecification size, JavaSingleImageResizer.ImageFormat outputFormat) throws ResizeException;
 }