org.apache.pig.data
Class DefaultDataBag

java.lang.Object
  org.apache.pig.data.DefaultAbstractBag
      org.apache.pig.data.DefaultDataBag

All Implemented Interfaces:

Serializable, Comparable, Iterable<Tuple>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable, DataBag, Spillable

public class DefaultDataBag
extends DefaultAbstractBag

An unordered collection of Tuples (possibly) with multiples. The tuples are stored in a List, since there is no concern for order or distinctness.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.data.DefaultAbstractBag

DefaultAbstractBag.BagDelimiterTuple, DefaultAbstractBag.EndBag, DefaultAbstractBag.StartBag

Field Summary

Fields inherited from class org.apache.pig.data.DefaultAbstractBag

endBag, MAX_SPILL_FILES, mContents, mLastContentsSize, mMemSize, mSize, mSpillFiles, startBag

Constructor Summary

DefaultDataBag()

DefaultDataBag(List<Tuple> listOfTuples)
This constructor creates a bag out of an existing list of tuples by taking ownership of the list and NOT copying the contents of the list.

Method Summary

boolean	isDistinct() Find out if the bag is distinct.
boolean	isSorted() Find out if the bag is sorted.
Iterator<Tuple>	iterator() Get an iterator to the bag.
long	spill() Instructs an object to spill whatever it can to disk and release references to any data structures it spills.

Methods inherited from class org.apache.pig.data.DefaultAbstractBag

add, addAll, addAll, clear, compareTo, equals, getMemorySize, getSpillFile, hashCode, incSpillCount, incSpillCount, markStale, readFields, reportProgress, size, toString, warn, write

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DefaultDataBag

public DefaultDataBag()

DefaultDataBag

public DefaultDataBag(List<Tuple> listOfTuples)

This constructor creates a bag out of an existing list of tuples by taking ownership of the list and NOT copying the contents of the list.

Parameters:

listOfTuples - List containing the tuples

Method Detail

isSorted

public boolean isSorted()

Description copied from interface: DataBag

Find out if the bag is sorted.

Returns:

true if this is a sorted data bag, false otherwise.

isDistinct

public boolean isDistinct()

Description copied from interface: DataBag

Find out if the bag is distinct.

Returns:

true if the bag is a distinct bag, false otherwise.

iterator

public Iterator<Tuple> iterator()

Description copied from interface: DataBag

Get an iterator to the bag. For default and distinct bags, no particular order is guaranteed. For sorted bags the order is guaranteed to be sorted according to the provided comparator.

Returns:

tuple iterator

spill

public long spill()

Description copied from interface: Spillable

Instructs an object to spill whatever it can to disk and release references to any data structures it spills.

Returns:

number of objects spilled.