use persisted string representation when loading from mongodb

java/com.sap.sailing.domain.racelogtrackingadapter/src/com/sap/sailing/domain/racelogtracking/impl/TrackFileImportDeviceIdentifierMongoHandler.java

@@ -24,7 +24,7 @@ public class TrackFileImportDeviceIdentifierMongoHandler implements DeviceIdenti
         String trackName = (String) dbObject.get(Fields.TRACK_NAME.name());
         TimePoint uploaded = TrackFileImportDeviceIdentifierJsonHandler.
                 loadTimePoint(dbObject.get(Fields.UPLOADED_MILLIS.name()));
-        return new TrackFileImportDeviceIdentifierImpl(uuid, fileName, trackName, uploaded);
+        return new TrackFileImportDeviceIdentifierImpl(uuid, stringRepresentation, fileName, trackName, uploaded);
     }
 
     @Override

java/com.sap.sailing.domain/src/com/sap/sailing/domain/trackfiles/TrackFileImportDeviceIdentifierImpl.java

@@ -15,6 +15,7 @@ public class TrackFileImportDeviceIdentifierImpl implements TrackFileImportDevic
     private final String fileName;
     private final String trackName;
     private final TimePoint timePoint;
+    private final String stringRepresentation;
     
     private static final ConcurrentMap<UUID, TrackFileImportDeviceIdentifier> cache = new ConcurrentHashMap<>();
     
@@ -30,10 +31,18 @@ public class TrackFileImportDeviceIdentifierImpl implements TrackFileImportDevic
     }
     
     public TrackFileImportDeviceIdentifierImpl(UUID id, String fileName, String trackName, TimePoint timePoint) {
+        this(id, computeStringRepresentation(id, trackName, fileName, timePoint), fileName,
+                trackName, timePoint);
+        cache.put(id, this);
+    }
+
+    public TrackFileImportDeviceIdentifierImpl(UUID id, String stringRepresentation, String fileName, String trackName,
+            TimePoint timePoint) {
         this.id = id;
         this.fileName = fileName;
         this.trackName = trackName;
         this.timePoint = timePoint;
+        this.stringRepresentation = stringRepresentation;
         cache.put(id, this);
     }
 
@@ -54,8 +63,7 @@ public class TrackFileImportDeviceIdentifierImpl implements TrackFileImportDevic
 
     @Override
     public String getStringRepresentation() {
-        return String.format("%s: %s\n  @%s(uploaded %s)",
-                id.toString(), trackName, fileName, timePoint);
+        return stringRepresentation;
     }
     
     @Override
@@ -92,4 +100,19 @@ public class TrackFileImportDeviceIdentifierImpl implements TrackFileImportDevic
         }
         return (TrackFileImportDeviceIdentifier) deviceIdentifier;
     }
+
+    /**
+     * Computes unique string representation for this device identifier. This string representaion should be human
+     * readable.
+     * 
+     * @param id
+     * @param fileName
+     * @param trackName
+     * @param timePoint
+     * @return
+     */
+    private static final String computeStringRepresentation(UUID id, String fileName, String trackName,
+            TimePoint timePoint) {
+        return String.format("%s: %s\n  @%s(uploaded %s)", id.toString(), trackName, fileName, timePoint);
+    }
 }