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java.lang.Object org.apache.crunch.types.writable.WritableType<T,W>
public class WritableType<T,W extends org.apache.hadoop.io.Writable>
Constructor Summary | |
---|---|
WritableType(Class<T> typeClass,
Class<W> writableClass,
MapFn<W,T> inputDoFn,
MapFn<T,W> outputDoFn,
PType... subTypes)
|
Method Summary | |
---|---|
boolean |
equals(Object obj)
|
Converter |
getConverter()
|
ReadableSourceTarget<T> |
getDefaultFileSource(org.apache.hadoop.fs.Path path)
Returns a SourceTarget that is able to read/write data using the serialization format
specified by this PType . |
T |
getDetachedValue(T value)
Returns a copy of a value (or the value itself) that can safely be retained. |
PTypeFamily |
getFamily()
Returns the PTypeFamily that this PType belongs to. |
MapFn |
getInputMapFn()
|
MapFn |
getOutputMapFn()
|
Class<W> |
getSerializationClass()
|
List<PType> |
getSubTypes()
Returns the sub-types that make up this PType if it is a composite instance, such as a tuple. |
Class<T> |
getTypeClass()
Returns the Java type represented by this PType . |
int |
hashCode()
|
void |
initialize(org.apache.hadoop.conf.Configuration conf)
Initialize this PType for use within a DoFn. |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public WritableType(Class<T> typeClass, Class<W> writableClass, MapFn<W,T> inputDoFn, MapFn<T,W> outputDoFn, PType... subTypes)
Method Detail |
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public PTypeFamily getFamily()
PType
PTypeFamily
that this PType
belongs to.
getFamily
in interface PType<T>
public Class<T> getTypeClass()
PType
PType
.
getTypeClass
in interface PType<T>
public Converter getConverter()
getConverter
in interface PType<T>
public MapFn getInputMapFn()
getInputMapFn
in interface PType<T>
public MapFn getOutputMapFn()
getOutputMapFn
in interface PType<T>
public List<PType> getSubTypes()
PType
getSubTypes
in interface PType<T>
public Class<W> getSerializationClass()
public ReadableSourceTarget<T> getDefaultFileSource(org.apache.hadoop.fs.Path path)
PType
SourceTarget
that is able to read/write data using the serialization format
specified by this PType
.
getDefaultFileSource
in interface PType<T>
public boolean equals(Object obj)
equals
in class Object
public void initialize(org.apache.hadoop.conf.Configuration conf)
PType
PType.getDetachedValue(Object)
.
initialize
in interface PType<T>
conf
- Configuration objectPType.getDetachedValue(Object)
public T getDetachedValue(T value)
PType
This is useful when iterable values being processed in a DoFn (via a reducer) need to be held
on to for more than the scope of a single iteration, as a reducer (and therefore also a DoFn
that has an Iterable as input) re-use deserialized values. More information on object reuse is
available in the DoFn
class documentation.
getDetachedValue
in interface PType<T>
value
- The value to be deep-copied
public int hashCode()
hashCode
in class Object
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