be.SIRAPRISE.typeimplementations

Class UNGROUP_RELATION

java.lang.Object

be.SIRAPRISE.typeimplementations.UNGROUP_RELATION

All Implemented Interfaces:

OperatorImplementation_V0104, OperatorImplementation_V0105, java.io.Externalizable, java.io.Serializable

public final class UNGROUP_RELATION
extends java.lang.Object
implements OperatorImplementation_V0105

The relation UNGROUP operator takes a single argument.

Author:

Erwin

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UNGROUP_RELATION(Heading heading, java.util.Map<NameIdentifier,TypeDeclaration> ungroupAttributes) Creates the UNGROUP_RELATION

Method Summary

Modifier and Type	Method and Description
static RelationBuffer	computeUngroup(RelationBuffer relationBuffer, java.util.Map<NameIdentifier,TypeDeclaration> ungroupAttributes)
ValueBuffer	executeOperator(java.util.LinkedList<ValueBuffer> args) Performs the actual logic of the operator.
java.lang.String[]	getArgumentTypeNames() Gets the list of names of types of the needed argument values
TypeDeclaration	getReturnTypeDeclaration() Gets the full type declaration of the type of the return value.
java.lang.String	getReturnTypeName() Gets the name of the type of the return value
java.lang.String	getSignature() Gets the name of the operator implemented by this implementation object
boolean	isDeterministic() Tells whether the operator is deterministic with respect to the arguments of its invocations.
void	readExternal(java.io.ObjectInput in)
static UNGROUPInvocationResultDetails	validateExpressionDetails(Heading heading, java.util.Set<NameIdentifier> ungroupAttributes, java.lang.String inputPredicate)
static UNGROUPInvocationResultDetails	validateExpressionDetails(Heading heading, java.util.Set<NameIdentifier> ungroupAttributes, java.lang.String inputPredicate, java.util.Collection<? extends KeyDef> inputKeySpecifications)
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

UNGROUP_RELATION

public UNGROUP_RELATION(Heading heading,
                        java.util.Map<NameIdentifier,TypeDeclaration> ungroupAttributes)

Creates the UNGROUP_RELATION

Parameters:

heading - the heading of the return type

ungroupAttributes - The ungroup attributes. The key of the map is the name of the RVA in the input, the NonScalarTypeDeclaration holds its heading.

Method Detail

computeUngroup

public static RelationBuffer computeUngroup(RelationBuffer relationBuffer,
                                            java.util.Map<NameIdentifier,TypeDeclaration> ungroupAttributes)

Parameters:

relationBuffer - the relationBuffer holding the body/tuples to be ungrouped according to the specs in ungroupAttributes

ungroupAttributes - the list of relation-typed attributes to be ungrouped in the result, mapped to their (nonscalar) typedeclaration in the heading of the input relation. This map must contain ONLY the ungroup attributes.

Returns:

the result of ungrouping the given relation over the given relation-typed ungroupAttributes

validateExpressionDetails

public static UNGROUPInvocationResultDetails validateExpressionDetails(Heading heading,
                                                                       java.util.Set<NameIdentifier> ungroupAttributes,
                                                                       java.lang.String inputPredicate)
                                                                throws UnGroupAttributeIsNotRelationTypedException,
                                                                       UnGroupCausesDuplicateAttributeException,
                                                                       MultipleUngroupNotSupportedException,
                                                                       NonExistingAttributeException

Parameters:

heading - the heading of the relation to be ungrouped according to the specs in ungroupAttributes

ungroupAttributes - the list of relation-typed attributes to be ungrouped in the result

inputPredicate - The predicate of the input expression. If unknown, use the empty string.

Returns:

The heading of the result of doing the specified ungroup

Throws:

UnGroupAttributeIsNotRelationTypedException - if a non-relation-typed attribute is specified among the ungroupAttributes

UnGroupCausesDuplicateAttributeException - if an attribute of a relation-typed attribute to be ungrouped also appears in the heading of the relation to be ungrouped itself

MultipleUngroupNotSupportedException - if the ungroupAttributes contain more than one attribute

NonExistingAttributeException - If an attribute is specified in ingroupAttributes that is not part of the heading

validateExpressionDetails

public static UNGROUPInvocationResultDetails validateExpressionDetails(Heading heading,
                                                                       java.util.Set<NameIdentifier> ungroupAttributes,
                                                                       java.lang.String inputPredicate,
                                                                       java.util.Collection<? extends KeyDef> inputKeySpecifications)
                                                                throws UnGroupAttributeIsNotRelationTypedException,
                                                                       UnGroupCausesDuplicateAttributeException,
                                                                       MultipleUngroupNotSupportedException,
                                                                       NonExistingAttributeException

Parameters:

heading - the heading of the relation to be ungrouped according to the specs in ungroupAttributes

ungroupAttributes - the list of relation-typed attributes to be ungrouped in the result

inputPredicate - The predicate of the input expression. If unknown, use the empty string.

inputKeySpecifications - The key specifications of the input expression. If unknown, an empty collection can be passed and the input will then be assumed to be all-key.

Returns:

The heading of the result of doing the specified ungroup

Throws:

UnGroupAttributeIsNotRelationTypedException - if a non-relation-typed attribute is specified among the ungroupAttributes

UnGroupCausesDuplicateAttributeException - if an attribute of a relation-typed attribute to be ungrouped also appears in the heading of the relation to be ungrouped itself

MultipleUngroupNotSupportedException - if the ungroupAttributes contain more than one attribute

NonExistingAttributeException - If an attribute is specified in ingroupAttributes that is not part of the heading

executeOperator

public ValueBuffer executeOperator(java.util.LinkedList<ValueBuffer> args)

Description copied from interface: OperatorImplementation_V0104

Performs the actual logic of the operator.

Specified by:

executeOperator in interface OperatorImplementation_V0104

Parameters:

args - the argument list. The list must hold as many ValueBuffer objects as there are arguments to the operator, and each ValueBuffer object holds a value for some argument to the operator. ValueBuffer objects on the list must appear in the same order as the operator argument declarations. Implementations have the option, but are not required, to do a check the conformance of the argument list (the argument count, notably) to the operator signature.

Returns:

A ValueBuffer object holding the result value of the operator execution in internal format.

getArgumentTypeNames

public java.lang.String[] getArgumentTypeNames()

Description copied from interface: OperatorImplementation_V0104

Gets the list of names of types of the needed argument values

Specified by:

getArgumentTypeNames in interface OperatorImplementation_V0104

Returns:

The names of the argument types

getReturnTypeDeclaration

public TypeDeclaration getReturnTypeDeclaration()

Description copied from interface: OperatorImplementation_V0105

Gets the full type declaration of the type of the return value. Differs from the _V0104 getReturnTypeName() in that for nonscalar return types, this method also returns the heading, not just only the RELATION or TUPLE typename.

Specified by:

getReturnTypeDeclaration in interface OperatorImplementation_V0105

Returns:

the full type declaration of the type of the return value

getReturnTypeName

public java.lang.String getReturnTypeName()

Description copied from interface: OperatorImplementation_V0104

Gets the name of the type of the return value

Specified by:

getReturnTypeName in interface OperatorImplementation_V0104

Returns:

the name of the type of the return value

getSignature

public java.lang.String getSignature()

Description copied from interface: OperatorImplementation_V0104

Gets the name of the operator implemented by this implementation object

Specified by:

getSignature in interface OperatorImplementation_V0104

Returns:

the name of the operator implemented by this implementation object

isDeterministic

public boolean isDeterministic()

Description copied from interface: OperatorImplementation_V0104

Tells whether the operator is deterministic with respect to the arguments of its invocations. An operator is deterministic if and only if for any two distinct invocations, if all the argument values are the same, then the result value returned will also be the same. An example of a nondeterministic operators is RANDOM().

Specified by:

isDeterministic in interface OperatorImplementation_V0104

Returns:

true if the operator is deterministic.

readExternal

public void readExternal(java.io.ObjectInput in)

Specified by:

readExternal in interface java.io.Externalizable

writeExternal

public void writeExternal(java.io.ObjectOutput out)

Specified by:

writeExternal in interface java.io.Externalizable