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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 org.apache.hadoop.io.serializer;

import java.io.IOException;
import java.io.InputStream;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * 

* Provides a facility for deserializing objects of type from an * {@link InputStream}. *

* *

* Deserializers are stateful, but must not buffer the input since * other producers may read from the input between calls to * {@link #deserialize(Object)}. *

* @param */ @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) @InterfaceStability.Evolving public interface Deserializer { /** *

Prepare the deserializer for reading.

*/ void open(InputStream in) throws IOException; /** *

* Deserialize the next object from the underlying input stream. * If the object t is non-null then this deserializer * may set its internal state to the next object read from the input * stream. Otherwise, if the object t is null a new * deserialized object will be created. *

* @return the deserialized object */ T deserialize(T t) throws IOException; /** *

Close the underlying input stream and clear up any resources.

*/ void close() throws IOException; }




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