Display: move default method impls to iface

Author: ctrueden

src/main/java/org/scijava/display/AbstractDisplay.java

@@ -109,12 +109,6 @@ public boolean canDisplay(final Class<?> c) {
 		return type.isAssignableFrom(c);
 	}
 
-	@Override
-	public boolean canDisplay(final Object o) {
-		if (o == null) return false;
-		return canDisplay(o.getClass());
-	}
-
 	@Override
 	public void display(final Object o) {
 		checkObject(o);
@@ -123,11 +117,6 @@ public void display(final Object o) {
 		add(typedObj);
 	}
 
-	@Override
-	public boolean isDisplaying(final Object o) {
-		return contains(o);
-	}
-
 	@Override
 	public void update() {
 		if (eventService != null && !isClosed) {

src/main/java/org/scijava/display/Display.java

@@ -66,7 +66,10 @@ public interface Display<T> extends List<T>, RichPlugin, Named {
 	boolean canDisplay(Class<?> c);
 
 	/** Tests whether the display is capable of visualizing the given object. */
-	boolean canDisplay(Object o);
+	default boolean canDisplay(final Object o) {
+		if (o == null) return false;
+		return canDisplay(o.getClass());
+	}
 
 	/**
 	 * Displays the given object in this display.
@@ -92,7 +95,9 @@ public interface Display<T> extends List<T>, RichPlugin, Named {
 	 * {@code DatasetView} that wraps that {@code Dataset}.
 	 * </p>
 	 */
-	boolean isDisplaying(Object o);
+	default boolean isDisplaying(final Object o) {
+		return contains(o);
+	}
 
 	/** Updates and redraws the display onscreen. */
 	void update();