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    
019    package org.apache.hadoop.hdfs.server.protocol;
020    
021    import java.io.DataInput;
022    import java.io.DataOutput;
023    import java.io.IOException;
024    
025    import org.apache.hadoop.hdfs.protocol.Block;
026    import org.apache.hadoop.io.Text;
027    import org.apache.hadoop.io.Writable;
028    
029    /**
030     * A data structure to store Block and delHints together, used to send
031     * received/deleted ACKs.
032     */
033    public class ReceivedDeletedBlockInfo implements Writable {
034      Block block;
035      String delHints;
036    
037      public final static String TODELETE_HINT = "-";
038    
039      public ReceivedDeletedBlockInfo() {
040      }
041    
042      public ReceivedDeletedBlockInfo(Block blk, String delHints) {
043        this.block = blk;
044        this.delHints = delHints;
045      }
046    
047      public Block getBlock() {
048        return this.block;
049      }
050    
051      public void setBlock(Block blk) {
052        this.block = blk;
053      }
054    
055      public String getDelHints() {
056        return this.delHints;
057      }
058    
059      public void setDelHints(String hints) {
060        this.delHints = hints;
061      }
062    
063      public boolean equals(Object o) {
064        if (!(o instanceof ReceivedDeletedBlockInfo)) {
065          return false;
066        }
067        ReceivedDeletedBlockInfo other = (ReceivedDeletedBlockInfo) o;
068        return this.block.equals(other.getBlock())
069            && this.delHints.equals(other.delHints);
070      }
071    
072      public int hashCode() {
073        assert false : "hashCode not designed";
074        return 0; 
075      }
076    
077      public boolean blockEquals(Block b) {
078        return this.block.equals(b);
079      }
080    
081      public boolean isDeletedBlock() {
082        return delHints.equals(TODELETE_HINT);
083      }
084    
085      @Override
086      public void write(DataOutput out) throws IOException {
087        this.block.write(out);
088        Text.writeString(out, this.delHints);
089      }
090    
091      @Override
092      public void readFields(DataInput in) throws IOException {
093        this.block = new Block();
094        this.block.readFields(in);
095        this.delHints = Text.readString(in);
096      }
097    
098      public String toString() {
099        return block.toString() + ", delHint: " + delHints;
100      }
101    }