public class NullWritable extends Object implements WritableComparable
Modifier and Type | Field and Description |
---|---|
static NullWritable |
INSTANCE |
Constructor and Description |
---|
NullWritable() |
Modifier and Type | Method and Description |
---|---|
int |
compareTo(Object o) |
boolean |
equals(Object o) |
WritableType |
getType()
Get the type of the writable.
|
void |
readFields(DataInput in)
Deserialize the fields of this object from
in . |
double |
toDouble()
Convert Writable to double.
|
float |
toFloat()
Convert Writable to float.
|
int |
toInt()
Convert Writable to int.
|
long |
toLong()
Convert Writable to long.
|
String |
toString() |
void |
write(DataOutput out)
Serialize the fields of this object to
out . |
void |
writeType(DataOutput out)
Write the type (a single short value) to the DataOutput.
|
public static final NullWritable INSTANCE
public int compareTo(Object o)
compareTo
in interface Comparable
public void write(DataOutput out) throws IOException
Writable
out
.write
in interface Writable
out
- DataOuput
to serialize this object into.IOException
public void readFields(DataInput in) throws IOException
Writable
in
.
For efficiency, implementations should attempt to re-use storage in the existing object where possible.
readFields
in interface Writable
in
- DataInput
to deseriablize this object from.IOException
public void writeType(DataOutput out) throws IOException
Writable
WritableFactory
for details.writeType
in interface Writable
out
- DataOutput to write toIOException
- For errors during writingpublic double toDouble()
Writable
public float toFloat()
Writable
public int toInt()
Writable
public long toLong()
Writable
public WritableType getType()
Writable
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