Class DDdependableFinder

java.lang.Object

org.apache.derby.impl.sql.catalog.DDdependableFinder

All Implemented Interfaces:

Externalizable, Serializable, DependableFinder, Formatable, TypedFormat

Direct Known Subclasses:

DDColumnDependableFinder

public class DDdependableFinder
extends Object
implements DependableFinder, Formatable

Class for most DependableFinders in the core DataDictionary. This class is stored in SYSDEPENDS for the finders for the provider and dependent. It stores no state, its functionality is driven off its format identifier.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private final int	formatId	/////////////////////////////////////////////////////////////////////

Constructor Summary

Constructors

Constructor	Description
DDdependableFinder(int formatId)	Public constructor for Formatable hoo-hah.

Method Summary

Modifier and Type	Method	Description
(package private) Dependable	findDependable(DataDictionary dd, UUID dependableObjectID)	Find the dependable for getDependable.
final Dependable	getDependable(DataDictionary dd, UUID dependableObjectID)	Get the dependable for the given UUID
String	getSQLObjectType()	The name of the class of Dependables as a "SQL Object" which this Finder can find.
final int	getTypeFormatId()	Get the formatID which corresponds to this class.
void	readExternal(ObjectInput in)	Read this object from a stream of stored objects.
String	toString()	///////////////////////////////////////////////////////////////
void	writeExternal(ObjectOutput out)	Write this object to a stream of stored objects.

Methods inherited from class Object

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

Field Details

formatId

private final int formatId

/////////////////////////////////////////////////////////////////////

Constructor Details

DDdependableFinder

public DDdependableFinder(int formatId)

Public constructor for Formatable hoo-hah.

Method Details

toString

public String toString()

///////////////////////////////////////////////////////////////

Overrides:

toString in class Object

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Read this object from a stream of stored objects. Nothing to do. Our persistent representation is just a 2-byte format id.

Specified by:

readExternal in interface Externalizable

Parameters:

in - read this.

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Write this object to a stream of stored objects. Again, nothing to do. We just stamp the output stream with our Format id.

Specified by:

writeExternal in interface Externalizable

Parameters:

out - write bytes here.

Throws:

IOException

getTypeFormatId

public final int getTypeFormatId()

Get the formatID which corresponds to this class.

Specified by:

getTypeFormatId in interface TypedFormat

Returns:

the formatID of this class

getSQLObjectType

public String getSQLObjectType()

Description copied from interface: DependableFinder

The name of the class of Dependables as a "SQL Object" which this Finder can find. This is a value like "Table" or "View". Every DependableFinder can find some class of Dependables.

Specified by:

getSQLObjectType in interface DependableFinder

Returns:

String type of the "SQL Object" which this Finder can find.

See Also:

• DependableFinder.getSQLObjectType()

getDependable

public final Dependable getDependable(DataDictionary dd,
 UUID dependableObjectID)
                               throws StandardException

Get the dependable for the given UUID

Specified by:

getDependable in interface DependableFinder

Parameters:

dd - DataDictionary to use for lookup.

dependableObjectID - the ID of a Dependable. Used to locate that Dependable.

Returns:

the associated Dependable

Throws:

StandardException - thrown on error

findDependable

Dependable findDependable(DataDictionary dd,
 UUID dependableObjectID)
                   throws StandardException

Find the dependable for getDependable. Can return a null references, in which case getDependable() will thrown an exception.

Throws:

StandardException