be.SIRAPRISE.typeimplementations

Class RENAME_RELATION

java.lang.Object

be.SIRAPRISE.typeimplementations.RENAME_RELATION

All Implemented Interfaces:

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

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

Author:

erwin

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RENAME_RELATION(Heading argumentHeading, java.util.Map<NameIdentifier,NameIdentifier> renames) Creates the RENAME_RELATION

Method Summary

Modifier and Type	Method and Description
static RelationBuffer	computeRename(RelationBuffer relationBuffer, java.util.Map<NameIdentifier,NameIdentifier> renames, java.util.Set<NameIdentifier> retainedAttributeNames)
static Heading	computeRenamedHeading(Heading argumentHeading, java.util.Map<NameIdentifier,NameIdentifier> renames)
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 RENAMEInvocationResultDetails	validateExpressionDetails(Heading heading, java.util.Map<NameIdentifier,NameIdentifier> renameFromToMap, 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

RENAME_RELATION

public RENAME_RELATION(Heading argumentHeading,
                       java.util.Map<NameIdentifier,NameIdentifier> renames)

Creates the RENAME_RELATION

Parameters:

argumentHeading - the input argument's heading

renames - The specification of the rename to apply

Method Detail

computeRenamedHeading

public static Heading computeRenamedHeading(Heading argumentHeading,
                                            java.util.Map<NameIdentifier,NameIdentifier> renames)

Parameters:

argumentHeading - The heading of an argument subjected to rename

renames - The renames to be applied

Returns:

The heading of the result of the rename

computeRename

public static RelationBuffer computeRename(RelationBuffer relationBuffer,
                                           java.util.Map<NameIdentifier,NameIdentifier> renames,
                                           java.util.Set<NameIdentifier> retainedAttributeNames)

Parameters:

relationBuffer - the buffer holding a relation to be subjected to a rename operation

renames - the set of rename entries to be applied

retainedAttributeNames - The retained attribute names (i.e. the attributes that are not subjected to a rename)

Returns:

The result from applying the specified renames to the input relation given

validateExpressionDetails

public static RENAMEInvocationResultDetails validateExpressionDetails(Heading heading,
                                                                      java.util.Map<NameIdentifier,NameIdentifier> renameFromToMap,
                                                                      java.lang.String inputPredicate,
                                                                      java.util.Collection<? extends KeyDef> inputKeySpecifications)
                                                               throws DuplicateAttributeException,
                                                                      NonExistingAttributeException

Parameters:

heading - The heading of a relation to be subjected to a rename

renameFromToMap - the set of rename entries to be applied

inputPredicate - The predicate of which the relation subjected to a restriction is the extension

inputKeySpecifications - The keys known to be satisfied by the relation subjected to a restriction

Returns:

The heading of the result of applying the specified rename to a relation that conforms to the given heading

Throws:

DuplicateAttributeException - If more than one attribute is being renamed to the same attribute

NonExistingAttributeException - If an attribute is specified in the renames that does not appear in 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