DATACASS-33 created CompositeRowId for composite primary keys

src/main/java/org/springframework/data/cassandra/mapping/CompositeRowId.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.cassandra.mapping;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.data.annotation.Id;
+
+/**
+ * Identifies composite row ID in the Cassandra table that contains several
+ * fields. Same as @org.springframework.data.annotation.Id
+ * 
+ * Example:
+ * 
+ * class AccountPK { String account; String region; }
+ * 
+ * @Table class Account {
+ * @CompositeRowId Account pk; }
+ * 
+ * 
+ * @author Alex Shvid
+ */
+@Retention(value = RetentionPolicy.RUNTIME)
+@Target(value = { ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE })
+@Id
+public @interface CompositeRowId {
+
+}