be.SIRAPRISE.ra

Class PACK

java.lang.Object

be.SIRAPRISE.ra.RelationalOperator

be.SIRAPRISE.ra.PACK

public abstract class PACK
extends RelationalOperator

PACK

Author:

ers

Constructor Summary

Constructors

Constructor and Description
PACK()

Method Summary

Modifier and Type	Method and Description
static Relation	computePack(Relation relation, NameIdentifier[] packAttributes)
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
static PACKInvocationResultDetails	validateExpressionDetails(Heading inputHeading, java.util.LinkedHashSet<NameIdentifier> packAttributeNames, java.lang.String inputPredicate, java.util.Collection<? extends KeyDef> inputKeySpecifications)

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

PACK

public PACK()

Method Detail

computePack

public static Relation computePack(Relation relation,
                                   NameIdentifier[] packAttributes)
                            throws EvaluationException

Parameters:

relation - the relation subjected to a PACK operation

packAttributes - the attributes using which to PACK the given relation

Returns:

The result of packing the given relation on the given attributes

Throws:

EvaluationException - If the evaluation fails for any reason. See the contained getCause() exception for more detail.

validateExpressionDetails

public static PACKInvocationResultDetails validateExpressionDetails(Heading inputHeading,
                                                                    java.util.LinkedHashSet<NameIdentifier> packAttributeNames,
                                                                    java.lang.String inputPredicate,
                                                                    java.util.Collection<? extends KeyDef> inputKeySpecifications)
                                                             throws AttributeNotIntervalTypedException,
                                                                    NonExistingAttributeException

Parameters:

inputHeading - the heading of a relation subjected to a PACK operation

packAttributeNames - the attributes using which to PACK the given relation

inputPredicate - the predicate of which the relation subjected to PACK is the extension

inputKeySpecifications - the key specifications known to be satisfied by the relation subjected to PACK

Returns:

The technical details about the invocation

Throws:

AttributeNotIntervalTypedException - If an attribute mentioned in the pack list is not interval-typed in the given heading

NonExistingAttributeException - If an attribute name is mentioned in the pack list that does not appear in the heading

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