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java.lang.Object org.apache.hadoop.mapred.join.TupleWritable
public class TupleWritable
Writable type storing multiple Writable
s.
Constructor Summary | |
---|---|
TupleWritable()
Create an empty tuple with no allocated storage for writables. |
|
TupleWritable(Writable[] vals)
Initialize tuple with storage; unknown whether any of them contain "written" values. |
Method Summary | |
---|---|
boolean |
equals(Object other)
|
Writable |
get(int i)
Get ith Writable from Tuple. |
boolean |
has(int i)
Return true if tuple has an element at the position provided. |
int |
hashCode()
|
Iterator<Writable> |
iterator()
Return an iterator over the elements in this tuple. |
void |
readFields(DataInput in)
Deserialize the fields of this object from in . |
int |
size()
The number of children in this Tuple. |
String |
toString()
Convert Tuple to String as in the following. |
void |
write(DataOutput out)
Writes each Writable to out . |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public TupleWritable()
public TupleWritable(Writable[] vals)
Method Detail |
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public boolean has(int i)
public Writable get(int i)
public int size()
public boolean equals(Object other)
equals
in class Object
public int hashCode()
hashCode
in class Object
public Iterator<Writable> iterator()
iterator
in interface Iterable<Writable>
public String toString()
toString
in class Object
public void write(DataOutput out) throws IOException
out
.
TupleWritable format:
<count><type1><type2>...<typen><obj1><obj2>...<objn>
write
in interface Writable
out
- DataOuput
to serialize this object into.
IOException
public void readFields(DataInput in) throws IOException
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
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