MapTypeID.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.record.meta;
- import java.io.IOException;
- import java.util.*;
- import org.apache.hadoop.record.RecordOutput;
- /**
- * Represents typeID for a Map
- */
- public class MapTypeID extends TypeID {
-
- private TypeID typeIDKey;
- private TypeID typeIDValue;
-
- public MapTypeID(TypeID typeIDKey, TypeID typeIDValue) {
- super(RIOType.MAP);
- this.typeIDKey = typeIDKey;
- this.typeIDValue = typeIDValue;
- }
-
- /**
- * get the TypeID of the map's key element
- */
- public TypeID getKeyTypeID() {
- return this.typeIDKey;
- }
-
- /**
- * get the TypeID of the map's value element
- */
- public TypeID getValueTypeID() {
- return this.typeIDValue;
- }
-
- void write(RecordOutput rout, String tag) throws IOException {
- rout.writeByte(typeVal, tag);
- typeIDKey.write(rout, tag);
- typeIDValue.write(rout, tag);
- }
-
- /**
- * Two map typeIDs are equal if their constituent elements have the
- * same type
- */
- public boolean equals(Object o) {
- if (!super.equals(o))
- return false;
- MapTypeID mti = (MapTypeID) o;
- return this.typeIDKey.equals(mti.typeIDKey) &&
- this.typeIDValue.equals(mti.typeIDValue);
- }
-
- /**
- * We use a basic hashcode implementation, since this class will likely not
- * be used as a hashmap key
- */
- public int hashCode() {
- return 37*17+typeIDKey.hashCode() + 37*17+typeIDValue.hashCode();
- }
-
- }