com.bigdata.relation.accesspath
Class AbstractElementBuffer.DeleteBuffer<R>

java.lang.Object
  com.bigdata.relation.accesspath.AbstractArrayBuffer<R>
      com.bigdata.relation.accesspath.AbstractElementBuffer<R>
          com.bigdata.relation.accesspath.AbstractElementBuffer.DeleteBuffer<R>

Type Parameters:

R -

All Implemented Interfaces:

IBuffer<R>

Enclosing class:

AbstractElementBuffer<R>

public static class AbstractElementBuffer.DeleteBuffer<R>
extends AbstractElementBuffer<R>

Buffer writes on IMutableRelation.delete(IChunkedOrderedIterator) when it is flushed.

Version:

$Id: AbstractElementBuffer.java 2265 2009-10-26 12:51:06Z thompsonbry $

Author:

Bryan Thompson

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.relation.accesspath.AbstractElementBuffer

AbstractElementBuffer.DeleteBuffer<R>, AbstractElementBuffer.InsertBuffer<R>

Field Summary

Fields inherited from class com.bigdata.relation.accesspath.AbstractArrayBuffer

buffer, capacity, cls, filter, size

Constructor Summary

protected

AbstractElementBuffer.DeleteBuffer(int capacity, IMutableRelation<R> relation, IKeyOrder<R> keyOrder, IElementFilter<R> filter) Ctor variant used when you have a strong guarantee of the order in which the elements will be written into the buffer.

Method Summary

protected long

flush(IChunkedOrderedIterator<R> itr) Concrete implementations must process the elements, causing the appropriate mutation on the target IRelation.

Methods inherited from class com.bigdata.relation.accesspath.AbstractElementBuffer

flush, getKeyOrder, getRelation

Methods inherited from class com.bigdata.relation.accesspath.AbstractArrayBuffer

accept, add, flush, isEmpty, reset, size

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractElementBuffer.DeleteBuffer

protected AbstractElementBuffer.DeleteBuffer(int capacity,
                                             IMutableRelation<R> relation,
                                             IKeyOrder<R> keyOrder,
                                             IElementFilter<R> filter)

Ctor variant used when you have a strong guarantee of the order in which the elements will be written into the buffer.

Parameters:

capacity -

relation -

keyOrder -

Method Detail

flush

protected long flush(IChunkedOrderedIterator<R> itr)

Description copied from class: AbstractElementBuffer

Concrete implementations must process the elements, causing the appropriate mutation on the target IRelation.

Note: The elements generally appear in an arbitrary order and need to be sorted into ordered chunks using IKeyOrder.getComparator() for the desired natural order(s).

Specified by:

flush in class AbstractElementBuffer<R>

Returns:

The #of elements that were modified in the backing relation when the buffer was flushed