add mediaType, width, height, and nbcolors to Image object

backend/src/main/java/pdl/backend/Image.java

@@ -1,15 +1,39 @@
 package pdl.backend;
 
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.net.URLConnection;
+
+import javax.imageio.ImageIO;
+
+import org.springframework.http.MediaType;
+import org.springframework.util.MimeType;
+
 public class Image {
 	private static Long count = Long.valueOf(0);
-	private Long id;
+	private final Long id;
 	private String name;
-	private byte[] data;
+	private final byte[] data;
+	private final MediaType mediaType;
+	private final int width;
+	private final int height;
+	private final int nbColors;
 
-	public Image(final String name, final byte[] data) {
+	public Image(final String name, final byte[] data) throws IOException {
 		id = count++;
 		this.name = name;
 		this.data = data;
+		this.mediaType = MediaType.valueOf(URLConnection.guessContentTypeFromName(name));
+		BufferedImage bufImg = ImageIO.read(new ByteArrayInputStream(data));
+		this.width = bufImg.getWidth();
+		this.height = bufImg.getHeight();
+		this.nbColors = bufImg.getColorModel().getNumComponents();
+
+	}
+
+	public MediaType getMediaType() {
+		return mediaType;
 	}
 
 	public long getId() {
@@ -27,4 +51,24 @@ public class Image {
 	public byte[] getData() {
 		return data;
 	}
+
+	public static Long getCount() {
+		return count;
+	}
+
+	public int getWidth() {
+		return width;
+	}
+
+	public int getHeight() {
+		return height;
+	}
+
+	public int getNbColors() {
+		return nbColors;
+	}
+
+	public String getSize() {
+		return this.getWidth() + "*" + this.getHeight() + "*" + this.getNbColors();
+	}
 }