com.metamatrix.query.processor.relational
Class DependentValueSource

java.lang.Object
  com.metamatrix.query.processor.relational.DependentValueSource

All Implemented Interfaces:

ValueIteratorSource

public class DependentValueSource
extends java.lang.Object
implements ValueIteratorSource

Constructor Summary

DependentValueSource()

Method Summary

IndexedTupleSource	getTupleSource()
TupleSourceID	getTupleSourceID()
ValueIterator	getValueIterator(Expression valueExpression) Attempt to obtain a ValueIterator from this source.
boolean	isReady() Check whether the source is ready to provide valid iterators
void	reset()
void	setTupleSource(IndexedTupleSource tupleSource, TupleSourceID tupleSourceID)

Methods inherited from class java.lang.Object

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

Constructor Detail

DependentValueSource

public DependentValueSource()

Method Detail

setTupleSource

public void setTupleSource(IndexedTupleSource tupleSource,
                           TupleSourceID tupleSourceID)

getTupleSourceID

public TupleSourceID getTupleSourceID()

getTupleSource

public IndexedTupleSource getTupleSource()

isReady

public boolean isReady()

Description copied from interface: ValueIteratorSource

Check whether the source is ready to provide valid iterators

Specified by:

isReady in interface ValueIteratorSource

Returns:

True if iterator is ready

getValueIterator

public ValueIterator getValueIterator(Expression valueExpression)

Description copied from interface: ValueIteratorSource

Attempt to obtain a ValueIterator from this source. If the iterator is not ready yet, return null to indicate that.

Specified by:

getValueIterator in interface ValueIteratorSource

Parameters:

valueExpression - The expression we are retrieving an iterator for

Returns:

ValueIterator if ready, null otherwise

See Also:

ValueIteratorSource.getValueIterator(com.metamatrix.query.sql.symbol.Expression)

reset

public void reset()