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
019package org.apache.hadoop.record.meta;
020
021import java.io.IOException;
022import java.util.*;
023
024import org.apache.hadoop.classification.InterfaceAudience;
025import org.apache.hadoop.classification.InterfaceStability;
026import org.apache.hadoop.record.RecordOutput;
027
028/** 
029 * Represents typeID for a Map 
030 * 
031 * @deprecated Replaced by <a href="https://hadoop.apache.org/avro/">Avro</a>.
032 */
033@Deprecated
034@InterfaceAudience.Public
035@InterfaceStability.Stable
036public class MapTypeID extends TypeID {
037  
038  private TypeID typeIDKey; 
039  private TypeID typeIDValue; 
040  
041  public MapTypeID(TypeID typeIDKey, TypeID typeIDValue) {
042    super(RIOType.MAP);
043    this.typeIDKey = typeIDKey;
044    this.typeIDValue = typeIDValue;
045  }
046  
047  /**
048   * get the TypeID of the map's key element
049   */
050  public TypeID getKeyTypeID() {
051    return this.typeIDKey;
052  }
053  
054  /**
055   * get the TypeID of the map's value element
056   */
057  public TypeID getValueTypeID() {
058    return this.typeIDValue;
059  }
060  
061  void write(RecordOutput rout, String tag) throws IOException {
062    rout.writeByte(typeVal, tag);
063    typeIDKey.write(rout, tag);
064    typeIDValue.write(rout, tag);
065  }
066  
067  /**
068   * Two map  typeIDs are equal if their constituent elements have the 
069   * same type
070   */
071  public boolean equals(Object o) {
072    if (!super.equals(o))
073      return false;
074
075    MapTypeID mti = (MapTypeID) o;
076
077    return this.typeIDKey.equals(mti.typeIDKey) &&
078           this.typeIDValue.equals(mti.typeIDValue);
079  }
080  
081  /**
082   * We use a basic hashcode implementation, since this class will likely not
083   * be used as a hashmap key 
084   */
085  public int hashCode() {
086    return 37*17+typeIDKey.hashCode() + 37*17+typeIDValue.hashCode();
087  }
088  
089}