/**
* 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.mrunit.internal.io;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.serializer.Deserializer;
import org.apache.hadoop.io.serializer.SerializationFactory;
import org.apache.hadoop.io.serializer.Serializer;
public class Serialization {
private SerializationFactory serializationFactory;
/**
* @param conf
*/
public Serialization(Configuration conf) {
serializationFactory = new SerializationFactory(conf);
}
/**
* Creates a new copy of the orig object. Depending on the serialization used,
* the serialization class may or may not copy the orig object into the copy
* object based on the contract on
* org.apache.hadoop.io.serializer.Deserializer.deserialize
*
* @param orig
* @param copy
* if null always returns a new object, if not null may or may not
* copy orig into copy depending on what serialization class is used
* @return a copy of the orig object
*/
@SuppressWarnings("unchecked")
public <T> T copy(final T orig, final T copy) {
if (copy != null && orig.getClass() != copy.getClass()) {
throw new IllegalArgumentException(orig.getClass() + " != "
+ copy.getClass());
}
final Class<?> clazz = orig.getClass();
final Serializer<Object> serializer;
final Deserializer<Object> deserializer;
try {
serializer = (Serializer<Object>) serializationFactory
.getSerializer(clazz);
deserializer = (Deserializer<Object>) serializationFactory
.getDeserializer(clazz);
} catch (NullPointerException e) {
throw new IllegalStateException(
"No applicable class implementing Serialization in conf at io.serializations for "
+ orig.getClass(), e);
}
try {
final DataOutputBuffer outputBuffer = new DataOutputBuffer();
serializer.open(outputBuffer);
serializer.serialize(orig);
final DataInputBuffer inputBuffer = new DataInputBuffer();
inputBuffer.reset(outputBuffer.getData(), outputBuffer.getLength());
deserializer.open(inputBuffer);
return (T) deserializer.deserialize(copy);
} catch (final IOException e) {
throw new RuntimeException(e);
}
}
/**
* Creates a new copy of the orig object
*
* @param orig
* @return a new copy of the orig object
*/
public <T> T copy(final T orig) {
return copy(orig, null);
}
/**
* Creates a new copy of the orig object
*
* @param orig
* @param conf
* new Configuration object to use
* @return a new copy of the orig object
*/
public <T> T copyWithConf(final T orig, final Configuration conf) {
serializationFactory = new SerializationFactory(conf);
return copy(orig);
}
}