dht: Import dht/RingPosition.java

dht/RingPosition.java

@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.cassandra.dht;
+
+/**
+ * Interface representing a position on the ring.
+ * Both Token and DecoratedKey represent a position in the ring, a token being
+ * less precise than a DecoratedKey (a token is really a range of keys).
+ */
+public interface RingPosition<C extends RingPosition<C>> extends Comparable<C>
+{
+    public Token getToken();
+    public IPartitioner getPartitioner();
+    public boolean isMinimum();
+    public C minValue();
+}