| Interface | Description | 
|---|---|
| WritableUnwrapper<W extends org.apache.hadoop.io.Writable,J> | Converts from Writable type to Java type | 
| WritableWrapper<W extends org.apache.hadoop.io.Writable,J> | Converts from Java type to Writable type | 
| Class | Description | 
|---|---|
| BooleanToBooleanWritableWrapper | Converts Booleans to BooleanWritables | 
| BooleanWritableToBooleanUnwrapper | Converts BooleanWritables to Booleans. | 
| ByteToByteWritableWrapper | Converts Bytes to ByteWritables | 
| ByteToIntWritableWrapper | Converts Bytes to IntWritables | 
| ByteToLongWritableWrapper | Converts Bytes to LongWritables | 
| ByteWritableToByteUnwrapper | Converts ByteWritables to Bytes | 
| ByteWritableToIntUnwrapper | Converts Integers to ByteWritables | 
| ByteWritableToLongUnwrapper | Converts ByteWritables to Longs | 
| ByteWritableToShortUnwrapper | Converts ByteWritables to Shorts | 
| DoubleToDoubleWritableWrapper | Converts Doubles to DoubleWritables | 
| DoubleWritableToDoubleUnwrapper | Converts DoubleWritables to Doubles | 
| FloatToDoubleWritableWrapper | Converts Floats to DoubleWritables | 
| FloatToFloatWritableWrapper | Converts Floats to FloatWritables | 
| FloatWritableToDoubleUnwrapper | Converts FloatWritables to Doubles | 
| FloatWritableToFloatUnwrapper | Converts FloatWritables to Floats | 
| IntToIntWritableWrapper | Converts Integers to IntWritables | 
| IntToLongWritableWrapper | Converts Integers to LongWritables | 
| IntWritableToIntUnwrapper | Converts IntWritables to Integers | 
| IntWritableToLongUnwrapper | Converts IntWritables to Longs | 
| JavaWritablePair<W extends org.apache.hadoop.io.Writable,J> | Holder for java and writable class pair. | 
| LongToLongWritableWrapper | Converts Longs to LongWritables | 
| LongWritableToLongUnwrapper | Converts LongWritables to Longs | 
| NoMessage | Type marking that in a particular superstep there will not be
 sent messages. | 
| ShortToIntWritableWrapper | Converts IntWritables to Shorts | 
| ShortToLongWritableWrapper | Converts Shorts to LongWritables | 
| WritableUnwrappers | Mapping of all the known Writable wrappers. | 
| WritableWrappers | Mapping of all the known Writable wrappers. | 
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