Added abstraction for tracks, which are mapped to a specific items

java/com.sap.sailing.domain.shared.android/src/com/sap/sailing/domain/tracking/MappedTrack.java

@@ -0,0 +1,20 @@
+package com.sap.sailing.domain.tracking;
+
+import com.sap.sse.common.Timed;
+
+/**
+ * {@link Track} specialization, which is mapped to a specific type of items.
+ * 
+ * @param <ItemType>
+ *            the type of item this track is mapped to
+ * @param <FixType>
+ *            the type of fix that is contained in this track
+ */
+public interface MappedTrack<ItemType, FixType extends Timed> extends Track<FixType> {
+    
+    /**
+     * @return the item this track is mapped to.
+     */
+    ItemType getTrackedItem();
+
+}

java/com.sap.sailing.domain.shared.android/src/com/sap/sailing/domain/tracking/impl/MappedTrackImpl.java

@@ -0,0 +1,39 @@
+package com.sap.sailing.domain.tracking.impl;
+
+import com.sap.sailing.domain.tracking.MappedTrack;
+import com.sap.sse.common.Timed;
+import com.sap.sse.util.impl.ArrayListNavigableSet;
+
+/**
+ * Default implementation of {@link MappedTrack} interface. 
+ *
+ * @param <ItemType>
+ *            the type of item this track is mapped to
+ * @param <FixType>
+ *            the type of fix that is contained in this track
+ */
+public class MappedTrackImpl<ItemType, FixType extends Timed> extends TrackImpl<FixType>
+        implements MappedTrack<ItemType, FixType> {
+
+    private static final long serialVersionUID = 6165693342087329096L;
+    
+    private final ItemType trackedItem;
+
+    /** @see TrackImpl#TrackImpl(String) */
+    public MappedTrackImpl(ItemType trackedItem, String nameForReadWriteLock) {
+        super(nameForReadWriteLock);
+        this.trackedItem = trackedItem;
+    }
+    
+    /** @see TrackImpl#TrackImpl(ArrayListNavigableSet, String) */
+    protected MappedTrackImpl(ItemType trackedItem, ArrayListNavigableSet<Timed> fixes, String nameForReadWriteLock) {
+        super(fixes, nameForReadWriteLock);
+        this.trackedItem = trackedItem;
+    }
+
+    @Override
+    public ItemType getTrackedItem() {
+        return trackedItem;
+    }
+
+}