be.SIRAPRISE.ra

Class RENAME

java.lang.Object

be.SIRAPRISE.ra.RelationalOperator

be.SIRAPRISE.ra.RENAME

public abstract class RENAME
extends RelationalOperator

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
RENAME()

Method Summary

Modifier and Type	Method and Description
static RelationBuffer	computeRename(RelationBuffer relationBuffer, java.util.Map<NameIdentifier,NameIdentifier> renames, java.util.HashSet<NameIdentifier> retainedAttributeNames)
static Relation	computeRename(Relation relation, java.util.Map<NameIdentifier,NameIdentifier> renames)
int	getMaximumArgumentCount() Gets the maximum argument count for this operator.
int	getMinimumArgumentCount() Gets the minimum argument count for this operator.
java.lang.String	getName() Gets the operator name
boolean	isMonoRelationOperator() Checks if the operator takes only one Relation as input
static RENAMEInvocationResultDetails	validateExpressionDetails(Heading heading, java.util.Map<NameIdentifier,NameIdentifier> renameFromToMap, java.lang.String inputPredicate, java.util.Collection<? extends KeyDef> inputKeySpecifications)

Methods inherited from class be.SIRAPRISE.ra.RelationalOperator

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

RENAME

public RENAME()

Method Detail

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

computeRename

public static Relation computeRename(Relation relation,
                                     java.util.Map<NameIdentifier,NameIdentifier> renames)
                              throws EvaluationException

Parameters:

relation - the relation to be subjected to a rename operation

renames - the set of rename entries to be applied

Returns:

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

Throws:

EvaluationException - If the evaluation failed for any reason. See the contained getCause() exception for more detail.

computeRename

public static RelationBuffer computeRename(RelationBuffer relationBuffer,
                                           java.util.Map<NameIdentifier,NameIdentifier> renames,
                                           java.util.HashSet<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

Returns:

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

getName

public final java.lang.String getName()

Description copied from class: RelationalOperator

Gets the operator name

Specified by:

getName in class RelationalOperator

Returns:

the operator name

isMonoRelationOperator

public final boolean isMonoRelationOperator()

Description copied from class: RelationalOperator

Checks if the operator takes only one Relation as input

Specified by:

isMonoRelationOperator in class RelationalOperator

Returns:

true if the operator takes only one Relation as input

getMaximumArgumentCount

public final int getMaximumArgumentCount()

Description copied from class: RelationalOperator

Gets the maximum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMaximumArgumentCount in class RelationalOperator

Returns:

the maximum argument count for this operator.

getMinimumArgumentCount

public final int getMinimumArgumentCount()

Description copied from class: RelationalOperator

Gets the minimum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMinimumArgumentCount in class RelationalOperator

Returns:

the minimum argument count for this operator