be.SIRAPRISE.typeimplementations

Class PACK

java.lang.Object

be.SIRAPRISE.typeimplementations.RelationalOperator

be.SIRAPRISE.typeimplementations.PACK

All Implemented Interfaces:

OperatorGenerator

@OperatorGeneratorCharacteristics(maximumArgumentCount=2,
                                  minimumArgumentCount=2,
                                  name="PACK",
                                  signature={EXPRESSION,STRING})
 @MonoRelationOperator
public abstract class PACK
extends RelationalOperator

PACK

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
PACK()

Method Summary

Modifier and Type	Method and Description
static Relation	computePack(Relation relation, NameIdentifier[] packAttributes)
OperatorImplementation_V0105	getOperatorImplementation(OperatorGeneratorArgument[] args) Gets an implementation instance of the operator.

Methods inherited from class be.SIRAPRISE.typeimplementations.RelationalOperator

getInvocationName, getMaximumArgumentCount, getMinimumArgumentCount, getName, getOperatorGeneratorSignature, isMonoRelationOperator, 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.

getOperatorImplementation

public final OperatorImplementation_V0105 getOperatorImplementation(OperatorGeneratorArgument[] args)

Description copied from interface: OperatorGenerator

Gets an implementation instance of the operator.

Parameters:

args - The arguments from which the instance is to be created. There must be exactly as many arguments as there are elements in the list returned from OperatorGenerator.getOperatorGeneratorSignature(). The correspondence between OperatorGeneratorArgumentType values and OperatorGeneratorArgument types is given in the table below :

correspondence between OperatorGeneratorArgumentType values and OperatorGeneratorArgument types

OperatorGeneratorArgumentType value	OperatorGeneratorArgument type
EXPRESSION	NonScalarOperatorGeneratorExpressionArgument
EXPRESSIONWITHSCOPE	NonScalarOperatorGeneratorExpressionArgument
STRING	NonScalarOperatorGeneratorTextArgument

Returns:

an instance of the operator