001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.fs; 019 020import org.apache.hadoop.classification.InterfaceAudience; 021import org.apache.hadoop.classification.InterfaceStability; 022 023/** 024 * Opaque interface that identifies a disk location. Subclasses 025 * should implement {@link Comparable} and override both equals and hashCode. 026 */ 027@InterfaceStability.Unstable 028@InterfaceAudience.Public 029public interface VolumeId extends Comparable<VolumeId> { 030 031 @Override 032 abstract public int compareTo(VolumeId arg0); 033 034 @Override 035 abstract public int hashCode(); 036 037 @Override 038 abstract public boolean equals(Object obj); 039 040}