org.apache.derby.impl.sql.catalog
Class DropDependencyFilter

java.lang.Object
  org.apache.derby.impl.sql.catalog.DropDependencyFilter

All Implemented Interfaces:

TupleFilter

public class DropDependencyFilter
extends java.lang.Object
implements TupleFilter

A Filter to qualify tuples coming from a scan of SYSDEPENDS. Tuples qualify if they have the right providerID.

Field Summary

(package private) DataValueFactory	dataValueFactory
(package private) BooleanDataValue	falseValue
(package private) UUID	providerID
(package private) BooleanDataValue	trueValue
(package private) UUIDFactory	uuidFactory

Constructor Summary

DropDependencyFilter(UUID providerID)
Construct a TupleFilter to qualify SYSDEPENDS rows with the designated providerID.

Method Summary

BooleanDataValue	execute(ExecRow currentRow) Pump a SYSDEPENDS row through the Filter.
private BooleanDataValue	getFalseValue() Gets a BooleanDataValue representing FALSE
private BooleanDataValue	getTrueValue() Gets a BooleanDataValue representing TRUE.
private UUIDFactory	getUUIDFactory() Get the UUID factory
void	init(ExecRow parameters) Initialize a Filter with a vector of parameters.

Methods inherited from class java.lang.Object

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

Field Detail

providerID

UUID providerID

uuidFactory

UUIDFactory uuidFactory

dataValueFactory

DataValueFactory dataValueFactory

trueValue

BooleanDataValue trueValue

falseValue

BooleanDataValue falseValue

Constructor Detail

DropDependencyFilter

public DropDependencyFilter(UUID providerID)

Construct a TupleFilter to qualify SYSDEPENDS rows with the designated providerID.

Parameters:

providerID - UUID of provider. Tuples with this ID qualify.

Method Detail

init

public void init(ExecRow parameters)
          throws StandardException

Initialize a Filter with a vector of parameters. This is a NOP. We initialize this filter at Constructor time.

Specified by:

init in interface TupleFilter

Parameters:

parameters - An ExecRow of parameter values

Throws:

StandardException - Thrown on error

execute

public BooleanDataValue execute(ExecRow currentRow)
                         throws StandardException

Pump a SYSDEPENDS row through the Filter. If the providerID of the row matches our providerID, we return true. Otherwise we return false.

Specified by:

execute in interface TupleFilter

Parameters:

currentRow - SYSDEPENDS row

Returns:

True if the row has our providerID. False otherwise.

Throws:

StandardException - Thrown on error

getUUIDFactory

private UUIDFactory getUUIDFactory()
                            throws StandardException

Get the UUID factory

Returns:

the UUID factory

Throws:

StandardException - thrown on failure

getTrueValue

private BooleanDataValue getTrueValue()
                               throws StandardException

Gets a BooleanDataValue representing TRUE.

Returns:

a TRUE value

Throws:

StandardException - Thrown on error

getFalseValue

private BooleanDataValue getFalseValue()
                                throws StandardException

Gets a BooleanDataValue representing FALSE

Returns:

a FALSE value

Throws:

StandardException - Thrown on error