ID.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.mapreduce;
- import java.io.DataInput;
- import java.io.DataOutput;
- import java.io.IOException;
- import org.apache.hadoop.io.WritableComparable;
- /**
- * A general identifier, which internally stores the id
- * as an integer. This is the super class of {@link JobID},
- * {@link TaskID} and {@link TaskAttemptID}.
- *
- * @see JobID
- * @see TaskID
- * @see TaskAttemptID
- */
- public abstract class ID implements WritableComparable<ID> {
- protected static final char SEPARATOR = '_';
- protected int id;
- /** constructs an ID object from the given int */
- public ID(int id) {
- this.id = id;
- }
- protected ID() {
- }
- /** returns the int which represents the identifier */
- public int getId() {
- return id;
- }
- @Override
- public String toString() {
- return String.valueOf(id);
- }
- @Override
- public int hashCode() {
- return Integer.valueOf(id).hashCode();
- }
- @Override
- public boolean equals(Object o) {
- if (this == o)
- return true;
- if(o == null)
- return false;
- if (o.getClass() == this.getClass()) {
- ID that = (ID) o;
- return this.id == that.id;
- }
- else
- return false;
- }
- /** Compare IDs by associated numbers */
- public int compareTo(ID that) {
- return this.id - that.id;
- }
- public void readFields(DataInput in) throws IOException {
- this.id = in.readInt();
- }
- public void write(DataOutput out) throws IOException {
- out.writeInt(id);
- }
-
- }