1 files changed, 15 insertions, 7 deletions
diff --git a/src/jrummikub/model/StoneTray.java b/src/jrummikub/model/StoneTray.java
index 0d48bf5..07719cf 100644
--- a/src/jrummikub/model/StoneTray.java
+++ b/src/jrummikub/model/StoneTray.java
@@ -9,6 +9,9 @@ import jrummikub.util.Pair;
 /**
  * A StoneTray is a collection of positioned objects (for example {@link Stone}s
  * or {@link StoneSet}s.
+ * 
+ * @param <E>
+ *            Type of positioned objects (must implement Sizeable)
  */
 public class StoneTray<E extends Sizeable> implements
 		Iterable<Pair<E, Position>> {
@@ -20,12 +23,12 @@ public class StoneTray<E extends Sizeable> implements
 		LEFT, RIGHT, TOP, BOTTOM;
 	}
 
-	
 	/**
 	 * Removes object from tray and returns it
 	 * 
 	 * @param position
 	 *            position of the object that will be removed
+	 * @return the picked up stone
 	 */
 	public E pickUp(Position position) {
 		for (Pair<E, Position> i : objects) {
@@ -69,8 +72,8 @@ public class StoneTray<E extends Sizeable> implements
 		for (Pair<E, Position> i : objects) {
 			Position currentPosition = i.getSecond();
 			E currentObject = i.getFirst();
-			if (!objectsOverlap(object, position,
-					currentObject, currentPosition)) {
+			if (!objectsOverlap(object, position, currentObject,
+					currentPosition)) {
 				continue;
 			}
 			// Object would be placed inside the current object
@@ -113,12 +116,10 @@ public class StoneTray<E extends Sizeable> implements
 		if (position1.getY() + object1.getHeight() <= position2.getY()) {
 			return false;
 		}
-		if (position1.getX() >= position2.getX()
-				+ object2.getWidth()) {
+		if (position1.getX() >= position2.getX() + object2.getWidth()) {
 			return false;
 		}
-		if (position1.getY() >= position2.getY()
-				+ object2.getHeight()) {
+		if (position1.getY() >= position2.getY() + object2.getHeight()) {
 			return false;
 		}
 		return true;
@@ -169,6 +170,13 @@ public class StoneTray<E extends Sizeable> implements
 		return overlapX > overlapY;
 	}
 
+	/**
+	 * Returns the position of an object that is already on the tray
+	 * 
+	 * @param object
+	 *            object whose position is requested
+	 * @return position of the object or null when the object is not on the tray
+	 */
 	public Position getPosition(E object) {
 		for (Pair<E, Position> i : objects) {
 			if (object.equals(i.getFirst())) {