Package org.apache.hadoop.io.serializer

Interface Deserializer<T>

Type Parameters:

T - generic type.

@LimitedPrivate({"HDFS","MapReduce"})
@Evolving
public interface Deserializer<T>

Provides a facility for deserializing objects of type <T> from an InputStream.

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

Method Summary

Modifier and Type	Method	Description
void	close()	Close the underlying input stream and clear up any resources.
T	deserialize(T t)	Deserialize the next object from the underlying input stream.
void	open(java.io.InputStream in)	Prepare the deserializer for reading.

Method Detail

open

void open(java.io.InputStream in)
   throws java.io.IOException

Prepare the deserializer for reading.

Parameters:

in - input stream.

Throws:

java.io.IOException - raised on errors performing I/O.

deserialize

T deserialize(T t)
       throws java.io.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.

Parameters:

t - t.

Returns:

the deserialized object

Throws:

java.io.IOException - raised on errors performing I/O.

close

void close()
    throws java.io.IOException

Close the underlying input stream and clear up any resources.

Throws:

java.io.IOException - raised on errors performing I/O.