+ add Redis ZSet commands

spring-datastore-redis/src/main/java/org/springframework/datastore/redis/connection/RedisZSetCommands.java

@@ -16,6 +16,9 @@
 
 package org.springframework.datastore.redis.connection;
 
+import java.util.List;
+
+
 /**
  * ZSet(SortedSet)-specific commands supported by Redis.
  * 
@@ -23,4 +26,41 @@ package org.springframework.datastore.redis.connection;
  */
 public interface RedisZSetCommands {
 
-}
+	public enum AGGREGATE {
+		SUM, MIN, MAX;
+	}
+
+	Boolean zAdd(String key, double score, String value);
+
+	Boolean zRem(String key, String value);
+
+	Double zIncrBy(String key, double increment, String value);
+
+	Integer zRank(String key, String value);
+
+	Integer zRevRank(String key, String value);
+
+	List<String> zRange(String key, int start, int end);
+
+	List<String> zRevRange(String key, int start, int end);
+
+	List<String> zRangeByScore(String key, double min, double max);
+
+	Integer zCount(String key, double min, double max);
+
+	Integer zCard(String key);
+
+	Double zScore(String key, String value);
+
+	Integer zRemRange(String key, int start, int end);
+
+	Integer zRemRangeByScore(String key, double min, double max);
+
+	Integer zUnionStore(String destKey, String... sets);
+
+	Integer zUnionStore(String destKey, AGGREGATE aggregate, double[] weights, String... sets);
+
+	Integer zInterStore(String destKey, String... sets);
+
+	Integer zInterStore(String destKey, AGGREGATE aggregate, double[] weights, String... sets);
+}