Package nz.org.riskscape.engine.join

Class NoIndexIndexer

java.lang.Object

nz.org.riskscape.engine.join.JoinIndexer

nz.org.riskscape.engine.join.NoIndexIndexer

public class NoIndexIndexer
extends JoinIndexer

JoinIndexer that does nothing, so should always work, albeit slowly

Nested Class Summary

Nested classes/interfaces inherited from class nz.org.riskscape.engine.join.JoinIndexer

JoinIndexer.Constructor

Field Summary

Fields

Modifier and Type	Field	Description
static final JoinIndexer.Constructor	CONSTRUCTOR
static final int	DEFAULT_INITIAL_INDEX_SIZE	The default capacity that the index will be created to contain.

Fields inherited from class nz.org.riskscape.engine.join.JoinIndexer

expressionRealizer, join

Constructor Summary

Constructors

Constructor	Description
NoIndexIndexer(nz.org.riskscape.engine.join.Join join, int initialIndexSize, nz.org.riskscape.engine.rl.ExpressionRealizer expressionRealizer)

Method Summary

Modifier and Type	Method	Description
void	addToIndex(nz.org.riskscape.engine.Tuple rhs)
nz.org.riskscape.engine.relation.TupleIterator	createRhsIterator(nz.org.riskscape.engine.Tuple lhs)	Create a TupleIterator that will contain at least the set of Tuples that are needed to completely join the lhs to the rhs based on the join.
boolean	isUsable()
String	toString()

Methods inherited from class nz.org.riskscape.engine.join.JoinIndexer

getExpressionRealizer, getJoin

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_INITIAL_INDEX_SIZE

public static final int DEFAULT_INITIAL_INDEX_SIZE

The default capacity that the index will be created to contain.

The NoIndexIndexer contains items individually. So for best performance the initial index should be as large as the expected number of items.

See Also:

• Constant Field Values

CONSTRUCTOR

public static final JoinIndexer.Constructor CONSTRUCTOR

Constructor Details

NoIndexIndexer

public NoIndexIndexer(nz.org.riskscape.engine.join.Join join,
 int initialIndexSize,
 nz.org.riskscape.engine.rl.ExpressionRealizer expressionRealizer)

Method Details

addToIndex

public void addToIndex(nz.org.riskscape.engine.Tuple rhs)

Specified by:

addToIndex in class JoinIndexer

createRhsIterator

public nz.org.riskscape.engine.relation.TupleIterator createRhsIterator(nz.org.riskscape.engine.Tuple lhs)

Description copied from class: JoinIndexer

Create a TupleIterator that will contain at least the set of Tuples that are needed to completely join the lhs to the rhs based on the join.

Specified by:

createRhsIterator in class JoinIndexer

isUsable

public boolean isUsable()

Specified by:

isUsable in class JoinIndexer

Returns:

true if this join can be used, e.g. it's suitable for the query and join. This is intended as a simpler way of providing a set of implementations such that the DefaultJoiner can work through which ones are appropriate by checking this method.

toString

public String toString()

Overrides:

toString in class Object