Class SequenceDescriptor

java.lang.Object

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

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

org.apache.derby.iapi.sql.dictionary.UniqueSQLObjectDescriptor

org.apache.derby.iapi.sql.dictionary.PrivilegedSQLObject

org.apache.derby.iapi.sql.dictionary.SequenceDescriptor

All Implemented Interfaces:

Dependable, Dependent, Provider

public class SequenceDescriptor
extends PrivilegedSQLObject
implements Provider, Dependent

This class is used by rows in the SYS.SYSSEQUENCES system table. See the header comment of SYSSEQUENCESRowFactory for the contract of that table. In particular, if the CURRENTVALUE column is null, then the sequence has been exhausted and no more values can be generated from it.

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	canCycle
private Long	currentValue
private DataTypeDescriptor	dataType
private long	increment
private long	maximumValue
private long	minimumValue
private final SchemaDescriptor	schemaDescriptor
private UUID	schemaId
private String	sequenceName
private UUID	sequenceUUID
private long	startValue

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
SequenceDescriptor(DataDictionary dataDictionary, SchemaDescriptor sd, UUID sequenceUUID, String sequenceName, DataTypeDescriptor dataType, Long currentValue, long startValue, long minimumValue, long maximumValue, long increment, boolean canCycle)	Constructor

Method Summary

Modifier and Type	Method	Description
boolean	canCycle()
void	drop(LanguageConnectionContext lcc)	Drop this sequence descriptor.
String	getClassType()	Get the provider's type.
Long	getCurrentValue()
DataTypeDescriptor	getDataType()
DependableFinder	getDependableFinder()	Get an object which can be written to disk and which, when read from disk, will find or reconstruct this in-memory Dependable.
String	getDescriptorName()
String	getDescriptorType()	Each descriptor must identify itself with its type; i.e index, check constraint whatever.
long	getIncrement()
long	getMaximumValue()
long	getMinimumValue()
String	getName()	Get the name of this object.
UUID	getObjectID()	Get the provider's UUID
String	getObjectName()	Return the name of this Provider.
String	getObjectTypeName()	Get the type of the object for storage in SYS.SYSPERMS
SchemaDescriptor	getSchemaDescriptor()	Get the objects schema descriptor
UUID	getSchemaId()
String	getSequenceName()
long	getStartValue()
UUID	getUUID()	Return the UUID for this Descriptor
boolean	isPersistent()	Is this provider persistent?
boolean	isValid()	Check that all of the dependent's dependencies are valid.
void	makeInvalid(int action, LanguageConnectionContext lcc)	Mark the dependent as invalid (due to at least one of its dependencies being invalid).
void	prepareToInvalidate(Provider p, int action, LanguageConnectionContext lcc)	Prepare to mark the dependent as invalid (due to at least one of its dependencies being invalid).
String	toString()

Methods inherited from class TupleDescriptor

getColumnDependableFinder, getDataDictionary, getDependableFinder, setDataDictionary

Methods inherited from class Object

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

Field Details

sequenceUUID

private UUID sequenceUUID

sequenceName

private String sequenceName

schemaDescriptor

private final SchemaDescriptor schemaDescriptor

schemaId

private UUID schemaId

dataType

private DataTypeDescriptor dataType

currentValue

private Long currentValue

startValue

private long startValue

minimumValue

private long minimumValue

maximumValue

private long maximumValue

increment

private long increment

canCycle

private boolean canCycle

Constructor Details

SequenceDescriptor

public SequenceDescriptor(DataDictionary dataDictionary,
 SchemaDescriptor sd,
 UUID sequenceUUID,
 String sequenceName,
 DataTypeDescriptor dataType,
 Long currentValue,
 long startValue,
 long minimumValue,
 long maximumValue,
 long increment,
 boolean canCycle)

Constructor

Parameters:

dataDictionary - data dictionary

sequenceUUID - unique identification in time and space of this sequence descriptor

sequenceName -

Method Details

getUUID

public UUID getUUID()

Description copied from class: UniqueTupleDescriptor

Return the UUID for this Descriptor

Specified by:

getUUID in class UniqueTupleDescriptor

Returns:

the uuid

See Also:

• UniqueTupleDescriptor.getUUID()

getObjectTypeName

public String getObjectTypeName()

Description copied from class: PrivilegedSQLObject

Get the type of the object for storage in SYS.SYSPERMS

Specified by:

getObjectTypeName in class PrivilegedSQLObject

See Also:

• PrivilegedSQLObject.getObjectTypeName()

toString

public String toString()

Overrides:

toString in class Object

drop

public void drop(LanguageConnectionContext lcc)
          throws StandardException

Drop this sequence descriptor. Only restricted drops allowed right now.

Throws:

StandardException - Could not be dropped.

isValid

public boolean isValid()

Check that all of the dependent's dependencies are valid.

Specified by:

isValid in interface Dependent

Returns:

true if the dependent is currently valid

prepareToInvalidate

public void prepareToInvalidate(Provider p,
 int action,
 LanguageConnectionContext lcc)
                         throws StandardException

Prepare to mark the dependent as invalid (due to at least one of its dependencies being invalid).

Specified by:

prepareToInvalidate in interface Dependent

Parameters:

p - the provider

action - The action causing the invalidation

lcc - the language connection context

Throws:

StandardException - thrown if unable to make it invalid

makeInvalid

public void makeInvalid(int action,
 LanguageConnectionContext lcc)
                 throws StandardException

Mark the dependent as invalid (due to at least one of its dependencies being invalid).

Specified by:

makeInvalid in interface Dependent

Parameters:

action - The action causing the invalidation

lcc - the language connection context

Throws:

StandardException - thrown if called in sanity mode

getName

public String getName()

Description copied from class: UniqueSQLObjectDescriptor

Get the name of this object. E.g. for a table descriptor, this will be the table name.

Specified by:

getName in class UniqueSQLObjectDescriptor

Returns:

the name

getSchemaDescriptor

public SchemaDescriptor getSchemaDescriptor()
                                     throws StandardException

Description copied from class: UniqueSQLObjectDescriptor

Get the objects schema descriptor

Specified by:

getSchemaDescriptor in class UniqueSQLObjectDescriptor

Returns:

the schema descriptor

Throws:

StandardException - on error

getDescriptorType

public String getDescriptorType()

Description copied from class: TupleDescriptor

Each descriptor must identify itself with its type; i.e index, check constraint whatever.

Overrides:

getDescriptorType in class TupleDescriptor

See Also:

• TupleDescriptor.getDescriptorType()

getDescriptorName

public String getDescriptorName()

Overrides:

getDescriptorName in class TupleDescriptor

See Also:

• TupleDescriptor.getDescriptorName()

getObjectID

public UUID getObjectID()

Get the provider's UUID

Specified by:

getObjectID in interface Dependable

Returns:

The provider's UUID

isPersistent

public boolean isPersistent()

Is this provider persistent? A stored dependency will be required if both the dependent and provider are persistent.

Specified by:

isPersistent in interface Dependable

Overrides:

isPersistent in class TupleDescriptor

Returns:

boolean Whether or not this provider is persistent.

getObjectName

public String getObjectName()

Return the name of this Provider. (Useful for errors.)

Specified by:

getObjectName in interface Dependable

Returns:

String The name of this provider.

getClassType

public String getClassType()

Get the provider's type.

Specified by:

getClassType in interface Dependable

Returns:

char The provider's type.

getDependableFinder

public DependableFinder getDependableFinder()

Description copied from interface: Dependable

Get an object which can be written to disk and which, when read from disk, will find or reconstruct this in-memory Dependable.

Specified by:

getDependableFinder in interface Dependable

Returns:

the stored form of this provider

See Also:

• Dependable.getDependableFinder()

getSequenceName

public String getSequenceName()

getSchemaId

public UUID getSchemaId()

getDataType

public DataTypeDescriptor getDataType()

getCurrentValue

public Long getCurrentValue()

getStartValue

public long getStartValue()

getMinimumValue

public long getMinimumValue()

getMaximumValue

public long getMaximumValue()

getIncrement

public long getIncrement()

canCycle

public boolean canCycle()