be.SIRAPRISE.typeimplementations

Interface OperatorGenerator

All Known Implementing Classes:

AGGREGATE, CONTAINSR, CONTAINSRUSING, CONTAINST, CONTAINSTUSING, DIVIDEBYPER, EXTEND, GROUP, GTCLOSE, INTERSECT, INTERSECTUSING, JOIN, JOINUSING, LEFTJOIN, LEFTJOINUSING, MINUS, MINUSUSING, PACK, PROJECT, RelationalOperator, RENAME, RESTRICT, ScalarOperatorGenerator, SEMIJOIN, SEMIJOINUSING, SEMIMINUS, SEMIMINUSUSING, SUMMARIZEBY, TCLOSE, TRANSFORM, UNGROUP, UNION, UNIONUSING, UNPACK, XMINUS, XMINUSUSING

public interface OperatorGenerator

NonScalarOperatorGenerators facilitate the creation instances of operator signatures (and implementation objects for them) when argument types for the operator are types derived/generated by a nonscalar type generator such as RELATION or TUPLE.

Author:

Erwin

Method Summary

Modifier and Type	Method and Description
java.lang.String	getInvocationName() Gets the invocation name
java.util.List<OperatorGeneratorArgumentType>	getOperatorGeneratorSignature() Gets the "generator signature" of the operator generator.
OperatorImplementation_V0105	getOperatorImplementation(OperatorGeneratorArgument[] args) Gets an implementation instance of the operator.

Method Detail

getInvocationName

java.lang.String getInvocationName()

Gets the invocation name

Returns:

the invocation name of the operator generator

getOperatorGeneratorSignature

java.util.List<OperatorGeneratorArgumentType> getOperatorGeneratorSignature()

Gets the "generator signature" of the operator generator. Note that this signature is distinct from the signature of the concerned operator. E.g. the UNIONUSING operator has a signature saying it takes TWO arguments (two relations), but the operator generator signature has a signature saying it takes THREE, the third being an argument that is processed only by the generator, and its effects being entirely incorporated into the operator implementation object returned.

Returns:

the "generator signature" of the operator generator.

getOperatorImplementation

OperatorImplementation_V0105 getOperatorImplementation(OperatorGeneratorArgument[] args)
                                                throws NotFoundException

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 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

Throws:

NotFoundException - If the given OperatorGeneratorArguments do not satisfy all of the rules of the OperatorGenerator. These rules are specific to each OperatorGenerator.