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java.lang.Object org.apache.hadoop.mapreduce.lib.join.TupleWritable
@InterfaceAudience.Public @InterfaceStability.Stable public class TupleWritable
Writable type storing multiple Writable
s.
This is *not* a general-purpose tuple type. In almost all cases, users are
encouraged to implement their own serializable types, which can perform
better validation and provide more efficient encodings than this class is
capable. TupleWritable relies on the join framework for type safety and
assumes its instances will rarely be persisted, assumptions not only
incompatible with, but contrary to the general case.
Writable
Field Summary | |
---|---|
protected BitSet |
written
|
Constructor Summary | |
---|---|
TupleWritable()
Create an empty tuple with no allocated storage for writables. |
|
TupleWritable(org.apache.hadoop.io.Writable[] vals)
Initialize tuple with storage; unknown whether any of them contain "written" values. |
Method Summary | |
---|---|
boolean |
equals(Object other)
|
org.apache.hadoop.io.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<org.apache.hadoop.io.Writable> |
iterator()
Return an iterator over the elements in this tuple. |
void |
readFields(DataInput 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 |
Field Detail |
---|
protected BitSet written
Constructor Detail |
---|
public TupleWritable()
public TupleWritable(org.apache.hadoop.io.Writable[] vals)
Method Detail |
---|
public boolean has(int i)
public org.apache.hadoop.io.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<org.apache.hadoop.io.Writable> iterator()
iterator
in interface Iterable<org.apache.hadoop.io.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 org.apache.hadoop.io.Writable
IOException
public void readFields(DataInput in) throws IOException
readFields
in interface org.apache.hadoop.io.Writable
IOException
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