be.SIRAPRISE.ra

Class GTCLOSE

java.lang.Object

be.SIRAPRISE.ra.RelationalOperator

be.SIRAPRISE.ra.GTCLOSE

public abstract class GTCLOSE
extends RelationalOperator

GTCLOSE

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
GTCLOSE()

Method Summary

Modifier and Type	Method and Description
static Relation	computeGTClose(Relation relation, java.util.Map<NameIdentifier,NameIdentifier> matchby, java.util.Map<NameIdentifier,java.lang.String> expressions)
int	getMaximumArgumentCount() Gets the maximum argument count for this operator.
int	getMinimumArgumentCount() Gets the minimum argument count for this operator.
java.lang.String	getName() Gets the operator name
boolean	isMonoRelationOperator() Checks if the operator takes only one Relation as input

Methods inherited from class be.SIRAPRISE.ra.RelationalOperator

toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GTCLOSE

public GTCLOSE()

Method Detail

computeGTClose

public static Relation computeGTClose(Relation relation,
                                      java.util.Map<NameIdentifier,NameIdentifier> matchby,
                                      java.util.Map<NameIdentifier,java.lang.String> expressions)

Parameters:

relation - The relation to be GTClosed

matchby - The definition of which attribute value pairs make two tuples match for transitive closure

expressions - The computational expressions to evaluate for determining the attribute values in the extra "transitive" tuples included in the result

Returns:

The result from computing the generalized transitive closure of the given relation, using the given match specs, with the given calculation expressions

getMaximumArgumentCount

public final int getMaximumArgumentCount()

Description copied from class: RelationalOperator

Gets the maximum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMaximumArgumentCount in class RelationalOperator

Returns:

the maximum argument count for this operator.

getMinimumArgumentCount

public final int getMinimumArgumentCount()

Description copied from class: RelationalOperator

Gets the minimum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMinimumArgumentCount in class RelationalOperator

Returns:

the minimum argument count for this operator

getName

public final java.lang.String getName()

Description copied from class: RelationalOperator

Gets the operator name

Specified by:

getName in class RelationalOperator

Returns:

the operator name

isMonoRelationOperator

public final boolean isMonoRelationOperator()

Description copied from class: RelationalOperator

Checks if the operator takes only one Relation as input

Specified by:

isMonoRelationOperator in class RelationalOperator

Returns:

true if the operator takes only one Relation as input