com.bigdata.btree.filter
Class TupleTransformer<E,F>

java.lang.Object
  com.bigdata.btree.filter.TupleTransformer<E,F>

All Implemented Interfaces:

ITupleFilter<F>, cutthecrap.utils.striterators.IFilter, Serializable

Direct Known Subclasses:

AtomicRowFilter

public abstract class TupleTransformer<E,F>
extends Object
implements ITupleFilter<F>

Abstract base class for an ITupleFilter that transforms the data type of the keys and/or values.

Version:

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

Author:

Bryan Thompson

See Also:

Serialized Form

TODO:

better encapsulation for patterns with a 1:1 transform (one tuple in, one out) and patterns with a M:1 (many in, one out) and 1:M (1 in, many out)?

Field Summary

protected ITupleSerializer<? extends Object,F>

tupleSer The serialization provider for the transformed tuples.

Constructor Summary

TupleTransformer(ITupleSerializer<? extends Object,F> tupleSer)

Method Summary

ITupleIterator<F>	filter(Iterator src) Strengthened return type.
protected abstract ITupleIterator<F>	newTransformer(LookaheadTupleFilter.ILookaheadTupleIterator<E> src) Method responsible for creating a new instance of the iterator that reads from the lookahead source whose tuples are of the source type and visits the transformed tuples.

Methods inherited from class java.lang.Object

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

Field Detail

tupleSer

protected final ITupleSerializer<? extends Object,F> tupleSer

The serialization provider for the transformed tuples.

Constructor Detail

TupleTransformer

public TupleTransformer(ITupleSerializer<? extends Object,F> tupleSer)

Parameters:

tupleSer - The serialization provider for the transformed tuples.

Method Detail

filter

public ITupleIterator<F> filter(Iterator src)

Description copied from interface: ITupleFilter

Strengthened return type.

Specified by:

filter in interface ITupleFilter<F>

Specified by:

filter in interface cutthecrap.utils.striterators.IFilter

Parameters:

src - The source iterator.

newTransformer

protected abstract ITupleIterator<F> newTransformer(LookaheadTupleFilter.ILookaheadTupleIterator<E> src)

Method responsible for creating a new instance of the iterator that reads from the lookahead source whose tuples are of the source type and visits the transformed tuples.