org.apache.pig.data

Class DefaultBagFactory

java.lang.Object

org.apache.pig.data.BagFactory

org.apache.pig.data.DefaultBagFactory

public class DefaultBagFactory
extends BagFactory

Default implementation of BagFactory.

Method Summary

Modifier and Type	Method and Description
DataBag	newDefaultBag() Get a default (unordered, not distinct) data bag.
DataBag	newDefaultBag(List<Tuple> listOfTuples) Get a default (unordered, not distinct) data bag from an existing list of tuples.
DataBag	newDistinctBag() Get a distinct data bag.
DataBag	newLimitedSortedBag(Comparator<Tuple> comp, long limit) Get a limited sorted data bag.
DataBag	newSortedBag(Comparator<Tuple> comp) Get a sorted data bag.

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

getInstance, registerBag, resetSelf

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

newDefaultBag

public DataBag newDefaultBag()

Get a default (unordered, not distinct) data bag.

Specified by:

newDefaultBag in class BagFactory

Returns:

default data bag.

newDefaultBag

public DataBag newDefaultBag(List<Tuple> listOfTuples)

Get a default (unordered, not distinct) data bag from an existing list of tuples. Note that the bag does NOT copy the tuples but uses the provided list as its backing store. So it takes ownership of the list.

Specified by:

newDefaultBag in class BagFactory

Parameters:

listOfTuples - list of tuples to be placed in the bag. This list may not be copied, it may be used directly by the created bag.

Returns:

default data bag.

newLimitedSortedBag

public DataBag newLimitedSortedBag(Comparator<Tuple> comp,
                                   long limit)

Get a limited sorted data bag.

Specified by:

newLimitedSortedBag in class BagFactory

Parameters:

comp - Comparator that controls how the data is sorted. If null, default comparator will be used.

limit - max number of tuples in bag

Returns:

a sorted data bag

newSortedBag

public DataBag newSortedBag(Comparator<Tuple> comp)

Get a sorted data bag.

Specified by:

newSortedBag in class BagFactory

Parameters:

comp - Comparator that controls how the data is sorted. If null, default comparator will be used.

Returns:

a sorted data bag

newDistinctBag

public DataBag newDistinctBag()

Get a distinct data bag.

Specified by:

newDistinctBag in class BagFactory

Returns:

distinct data bag