Class CheckConstraintDescriptor

java.lang.Object

org.apache.derby.iapi.sql.dictionary.TupleDescriptor

org.apache.derby.iapi.sql.dictionary.UniqueTupleDescriptor

org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor

org.apache.derby.iapi.sql.dictionary.CheckConstraintDescriptor

All Implemented Interfaces:

Dependable, Dependent, Provider

public class CheckConstraintDescriptor
extends ConstraintDescriptor

This class represents a check constraint descriptor.

Field Summary

Fields

Modifier and Type	Field	Description
private String	constraintText
private ReferencedColumns	referencedColumns

Fields inherited from class ConstraintDescriptor

ALL, constraintId, constraintName, DISABLED, ENABLED, SYSCONSTRAINTS_STATE_FIELD, table

Fields inherited from interface Dependable

ACTIVATION, ALIAS, COLUMNS_IN_TABLE, COLUMNS_PERMISSION, CONGLOMERATE, CONSTRAINT, DEFAULT, FILE, HEAP, INDEX, PERM, PREPARED_STATEMENT, ROLE_GRANT, ROUTINE_PERMISSION, SCHEMA, SEQUENCE, STORED_PREPARED_STATEMENT, TABLE, TABLE_PERMISSION, TRIGGER, VIEW

Constructor Summary

Constructors

Constructor	Description
CheckConstraintDescriptor(DataDictionary dataDictionary, TableDescriptor table, String constraintName, boolean deferrable, boolean initiallyDeferred, UUID constraintId, String constraintText, ReferencedColumns referencedColumns, SchemaDescriptor schemaDesc, boolean isEnabled)

Method Summary

Modifier and Type	Method	Description
UUID	getConglomerateId()	Get the UUID of the backing index, if one exists.
String	getConstraintText()	Get the text of the constraint.
int	getConstraintType()	Gets an identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).
int[]	getReferencedColumns()	Get the referenced columns as an int[] of column ids.
ReferencedColumns	getReferencedColumnsDescriptor()	Get the ReferencedColumns.
boolean	hasBackingIndex()	Does this constraint have a backing index?
boolean	needsToFire(int stmtType, int[] modifiedCols)	Does this constraint need to fire on this type of DML?
void	setReferencedColumnsDescriptor(ReferencedColumns rcd)	Set the ReferencedColumns; used in drop column
String	toString()	Convert the CheckConstraintDescriptor to a String.

Methods inherited from class ConstraintDescriptor

areColumnsComparable, columnIntersects, deferrable, doColumnsIntersect, drop, enforced, getClassType, getColumnDescriptors, getConstraintName, getDependableFinder, getDescriptorName, getDescriptorType, getKeyColumns, getObjectID, getObjectName, getReferenceCount, getSchemaDescriptor, getTableDescriptor, getTableId, getUUID, initiallyDeferred, isReferenced, isValid, makeInvalid, prepareToInvalidate, setDeferrable, setEnforced, setInitiallyDeferred

Methods inherited from class TupleDescriptor

getColumnDependableFinder, getDataDictionary, getDependableFinder, isPersistent, setDataDictionary

Methods inherited from class Object

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

Methods inherited from interface Dependable

isPersistent

Field Details

referencedColumns

private ReferencedColumns referencedColumns

constraintText

private String constraintText

Constructor Details

CheckConstraintDescriptor

CheckConstraintDescriptor(DataDictionary dataDictionary,
 TableDescriptor table,
 String constraintName,
 boolean deferrable,
 boolean initiallyDeferred,
 UUID constraintId,
 String constraintText,
 ReferencedColumns referencedColumns,
 SchemaDescriptor schemaDesc,
 boolean isEnabled)

Method Details

hasBackingIndex

public boolean hasBackingIndex()

Does this constraint have a backing index?

Specified by:

hasBackingIndex in class ConstraintDescriptor

Returns:

boolean Whether or not there is a backing index for this constraint.

getConstraintType

public int getConstraintType()

Gets an identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).

Specified by:

getConstraintType in class ConstraintDescriptor

Returns:

An identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).

getConstraintText

public String getConstraintText()

Get the text of the constraint. (Only non-null/meaningful for check constraints.)

Overrides:

getConstraintText in class ConstraintDescriptor

Returns:

The constraint text.

getConglomerateId

public UUID getConglomerateId()

Get the UUID of the backing index, if one exists.

Specified by:

getConglomerateId in class ConstraintDescriptor

Returns:

The UUID of the backing index, if one exists, else null.

getReferencedColumnsDescriptor

public ReferencedColumns getReferencedColumnsDescriptor()

Get the ReferencedColumns.

Returns:

The ReferencedColumns.

setReferencedColumnsDescriptor

public void setReferencedColumnsDescriptor(ReferencedColumns rcd)

Set the ReferencedColumns; used in drop column

Parameters:

rcd - The new ReferencedColumns.

getReferencedColumns

public int[] getReferencedColumns()

Get the referenced columns as an int[] of column ids.

Overrides:

getReferencedColumns in class ConstraintDescriptor

Returns:

The array of referenced column ids.

needsToFire

public boolean needsToFire(int stmtType,
 int[] modifiedCols)

Does this constraint need to fire on this type of DML? For a check constraint, all inserts, and appropriate updates

Specified by:

needsToFire in class ConstraintDescriptor

Parameters:

stmtType - the type of DML (StatementType.INSERT|StatementType.UPDATE|StatementType.DELETE)

modifiedCols - the columns modified, or null for all

Returns:

true/false

toString

public String toString()

Convert the CheckConstraintDescriptor to a String.

Overrides:

toString in class ConstraintDescriptor

Returns:

A String representation of this CheckConstraintDescriptor