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     */
018    package org.apache.hadoop.hdfs;
019    
020    import org.apache.commons.lang.builder.EqualsBuilder;
021    import org.apache.commons.lang.builder.HashCodeBuilder;
022    import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
023    
024    /**
025     * An immutable key which identifies a block.
026     */
027    final public class ExtendedBlockId {
028      /**
029       * The block ID for this block.
030       */
031      private final long blockId;
032    
033      /**
034       * The block pool ID for this block.
035       */
036      private final String bpId;
037    
038      public static ExtendedBlockId fromExtendedBlock(ExtendedBlock block) {
039        return new ExtendedBlockId(block.getBlockId(), block.getBlockPoolId());
040      }
041      
042      public ExtendedBlockId(long blockId, String bpId) {
043        this.blockId = blockId;
044        this.bpId = bpId;
045      }
046    
047      public long getBlockId() {
048        return this.blockId;
049      }
050    
051      public String getBlockPoolId() {
052        return this.bpId;
053      }
054    
055      @Override
056      public boolean equals(Object o) {
057        if ((o == null) || (o.getClass() != this.getClass())) {
058          return false;
059        }
060        ExtendedBlockId other = (ExtendedBlockId)o;
061        return new EqualsBuilder().
062            append(blockId, other.blockId).
063            append(bpId, other.bpId).
064            isEquals();
065      }
066    
067      @Override
068      public int hashCode() {
069        return new HashCodeBuilder().
070            append(this.blockId).
071            append(this.bpId).
072            toHashCode();
073      }
074    
075      @Override
076      public String toString() {
077        return new StringBuilder().append(blockId).
078            append("_").append(bpId).toString();
079      }
080    }