[LIB-5] Collection empty objects,reporting and serializable

[snooker-score-api.git] / src / main / java / org / hedgecode / snooker / json / JsonRankings.java

diff --git a/src/main/java/org/hedgecode/snooker/json/JsonRankings.java b/src/main/java/org/hedgecode/snooker/json/JsonRankings.java
index 75a3358..ac0a1ae 100644 (file)
--- a/src/main/java/org/hedgecode/snooker/json/JsonRankings.java
+++ b/src/main/java/org/hedgecode/snooker/json/JsonRankings.java
@@ -30,6 +30,8 @@ import org.hedgecode.snooker.compare.RankingComparators;
  */

 public class JsonRankings extends JsonCollectionEntity<Ranking> implements Rankings {

 

+    private static final JsonRankings EMPTY = new JsonRankings(new Ranking[0]);

+

     protected JsonRankings(Ranking[] entities) {

         super(entities);

     }

@@ -52,7 +54,7 @@ public class JsonRankings extends JsonCollectionEntity<Ranking> implements Ranki
         for (Ranking ranking : this)

             if (ranking.sum() >= minSum && ranking.sum() <= maxSum)

                 rankings.add(ranking);

-        return rankings.isEmpty() ? null : new JsonRankings(rankings);

+        return rankings.isEmpty() ? EMPTY : new JsonRankings(rankings);

     }

 

     @Override

@@ -68,4 +70,5 @@ public class JsonRankings extends JsonCollectionEntity<Ranking> implements Ranki
                 RankingComparators.SUM.comparator()

         );

     }

+

 }