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R3704/hadoop-2.3.0-src/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/testjar/ExternalWritable.java
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ExternalWritable.java
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/**
* 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 testjar;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
/**
* This is an example simple writable class. This is used as a class external
* to the Hadoop IO classes for testing of user Writable classes.
*
*/
public class ExternalWritable
implements WritableComparable {
private String message = null;
public ExternalWritable() {
}
public ExternalWritable(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public void readFields(DataInput in)
throws IOException {
message = null;
boolean hasMessage = in.readBoolean();
if (hasMessage) {
message = in.readUTF();
}
}
public void write(DataOutput out)
throws IOException {
boolean hasMessage = (message != null && message.length() > 0);
out.writeBoolean(hasMessage);
if (hasMessage) {
out.writeUTF(message);
}
}
public int compareTo(Object o) {
if (!(o instanceof ExternalWritable)) {
throw new IllegalArgumentException("Input not an ExternalWritable");
}
ExternalWritable that = (ExternalWritable)o;
return this.message.compareTo(that.message);
}
public String toString() {
return this.message;
}
}
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