org.apache.derby.iapi.services.io

Class FormatableInstanceGetter

java.lang.Object

org.apache.derby.iapi.services.io.FormatableInstanceGetter

All Implemented Interfaces:

InstanceGetter

Direct Known Subclasses:

BasicUUIDGetter, CoreDDFinderClassInfo, DepClassInfo, DTSClassInfo, HeapClassInfo, TypesImplInstanceGetter

public abstract class FormatableInstanceGetter
extends java.lang.Object
implements InstanceGetter

Class that loads Formattables (typically from disk)through one level of indirection. A concrete implementation of this class is registered as the class to handle a number of format identifiers in RegisteredFormatIds. When the in-memory representation of RegisteredFormatIds is set up an instance of the concrete class will be created for each format identifier the class is registered for, and each instances will have its setFormatId() called once with the appropriate format identifier.
When a Formattable object is read from disk and its registered class is an instance of FormatableInstanceGetter the getNewInstance() method will be called to create the object. The implementation can use the fmtId field to determine the class of the instance to be returned.
Instances of FormatableInstanceGetter are system wide, that is there is a single set of RegisteredFormatIds per system.

See Also:

RegisteredFormatIds

Field Summary

Fields

Modifier and Type	Field and Description
protected int	fmtId Format identifier of the object

Constructor Summary

Constructors

Constructor and Description
FormatableInstanceGetter()

Method Summary

Methods

Modifier and Type	Method and Description
void	setFormatId(int fmtId) Set the format identifier that this instance will be loading from disk.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.iapi.services.loader.InstanceGetter

getNewInstance

Field Detail

fmtId

protected int fmtId

Format identifier of the object

Constructor Detail

FormatableInstanceGetter

public FormatableInstanceGetter()

Method Detail

setFormatId

public final void setFormatId(int fmtId)

Set the format identifier that this instance will be loading from disk.