be.SIRAPRISE.typeimplementations

Class MINUS_RELATION_RELATION

java.lang.Object

be.SIRAPRISE.typeimplementations.MINUS_RELATION_RELATION

public abstract class MINUS_RELATION_RELATION
extends java.lang.Object

Class providing a utility method for calculating relational differences. Some future version will hold a full-blown operator implementation for the relational difference operator. Invocations of this operator will be equivalent to an invocation of MINUSUSING_RELATION_RELATION, with the third argument mentioning all the interval-typed attributes in the relations.

Author:

Erwin

Method Summary

Modifier and Type	Method and Description
static java.util.Set<TupleBuffer>	computePlainDifference(java.util.Collection<? extends TupleBuffer> minuend, java.util.Collection<? extends TupleBuffer> subtrahend) Method for computing "plain" relational difference between two given collections of tuple buffers
static MINUSInvocationResultDetails	validateExpressionDetails(Heading minuendHeading, Heading subtrahendHeading, java.lang.String relationPredicate1, java.lang.String relationPredicate2, java.util.LinkedHashSet<NameIdentifier> usingAttributes)

Methods inherited from class java.lang.Object

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

Method Detail

computePlainDifference

public static java.util.Set<TupleBuffer> computePlainDifference(java.util.Collection<? extends TupleBuffer> minuend,
                                                                java.util.Collection<? extends TupleBuffer> subtrahend)

Method for computing "plain" relational difference between two given collections of tuple buffers

Parameters:

minuend - The values from which will be subtracted

subtrahend - The values to be subtracted

Returns:

the computed difference

validateExpressionDetails

public static MINUSInvocationResultDetails validateExpressionDetails(Heading minuendHeading,
                                                                     Heading subtrahendHeading,
                                                                     java.lang.String relationPredicate1,
                                                                     java.lang.String relationPredicate2,
                                                                     java.util.LinkedHashSet<NameIdentifier> usingAttributes)
                                                              throws MinusHeadingsIncompatibleException,
                                                                     AttributeNotIntervalTypedException,
                                                                     NonExistingAttributeException

Parameters:

minuendHeading - the heading of the first argument in a union

subtrahendHeading - the heading of the second argument in a union

relationPredicate2 - The relation predicate of the second argument in a union

relationPredicate1 - The relation predicate of the first argument in a union

usingAttributes - The in-order list of attributes that are to be treated in 'USING' mode by the difference

Returns:

Info about the result of a union invocation

Throws:

MinusHeadingsIncompatibleException - if the given headings are not union compatible

AttributeNotIntervalTypedException - If an attribute named in the usingAttributes appears in the heading but is not interval-typed

NonExistingAttributeException - If an attribute named in the usingAttributes does not appear in the heading