1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.record.meta; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.util.*; |
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23 | |
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24 | import org.apache.hadoop.record.RecordOutput; |
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25 | |
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26 | /** |
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27 | * Represents typeID for a Map |
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28 | */ |
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29 | public class MapTypeID extends TypeID { |
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30 | |
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31 | private TypeID typeIDKey; |
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32 | private TypeID typeIDValue; |
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33 | |
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34 | public MapTypeID(TypeID typeIDKey, TypeID typeIDValue) { |
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35 | super(RIOType.MAP); |
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36 | this.typeIDKey = typeIDKey; |
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37 | this.typeIDValue = typeIDValue; |
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38 | } |
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39 | |
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40 | /** |
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41 | * get the TypeID of the map's key element |
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42 | */ |
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43 | public TypeID getKeyTypeID() { |
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44 | return this.typeIDKey; |
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45 | } |
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46 | |
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47 | /** |
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48 | * get the TypeID of the map's value element |
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49 | */ |
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50 | public TypeID getValueTypeID() { |
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51 | return this.typeIDValue; |
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52 | } |
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53 | |
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54 | void write(RecordOutput rout, String tag) throws IOException { |
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55 | rout.writeByte(typeVal, tag); |
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56 | typeIDKey.write(rout, tag); |
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57 | typeIDValue.write(rout, tag); |
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58 | } |
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59 | |
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60 | /** |
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61 | * Two map typeIDs are equal if their constituent elements have the |
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62 | * same type |
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63 | */ |
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64 | public boolean equals(Object o) { |
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65 | if (!super.equals(o)) |
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66 | return false; |
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67 | |
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68 | MapTypeID mti = (MapTypeID) o; |
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69 | |
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70 | return this.typeIDKey.equals(mti.typeIDKey) && |
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71 | this.typeIDValue.equals(mti.typeIDValue); |
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72 | } |
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73 | |
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74 | /** |
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75 | * We use a basic hashcode implementation, since this class will likely not |
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76 | * be used as a hashmap key |
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77 | */ |
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78 | public int hashCode() { |
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79 | return 37*17+typeIDKey.hashCode() + 37*17+typeIDValue.hashCode(); |
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80 | } |
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81 | |
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82 | } |
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