arlut.csd.ganymede
Class DBObjectDeltaRec

java.lang.Object
  |
  +--arlut.csd.ganymede.DBObjectDeltaRec

All Implemented Interfaces:

FieldType

public final class DBObjectDeltaRec

extends java.lang.Object

implements FieldType

This class is used to represent a record of changes that need to be made to a DBObject in the DBStore.

This class will be used in to handle writing and reading records of changes made to objects in the Ganymede journal file.

Field Summary

(package private) static boolean	debug
(package private) java.util.Vector	fieldRecs
(package private) arlut.csd.ganymede.Invid	invid

Fields inherited from interface arlut.csd.ganymede.FieldType

BOOLEAN, DATE, FIRSTFIELD, FLOAT, INVID, IP, LASTFIELD, NUMERIC, PASSWORD, PERMISSIONMATRIX, STRING

Constructor Summary

DBObjectDeltaRec(java.io.DataInput in)
This DBObjectDeltaRec constructor is used to load a delta record from a Journal stream.

DBObjectDeltaRec(arlut.csd.ganymede.DBObject oldObj, arlut.csd.ganymede.DBObject newObj)
This DBObjectDeltaRec constructor is used to generate a delta record that records the difference between two objects for the Ganymede journal

Method Summary

arlut.csd.ganymede.DBObject	applyDelta(arlut.csd.ganymede.DBObject original) This method takes an object in its original state, and returns a new copy of the object with the changes embodied in this DBObjectDeltaRec applied to it.
void	emit(java.io.DataOutput out) This method emits this delta rec to a file
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

debug

static final boolean debug

See Also:

Constant Field Values

invid

arlut.csd.ganymede.Invid invid

fieldRecs

java.util.Vector fieldRecs

Constructor Detail

DBObjectDeltaRec

public DBObjectDeltaRec(arlut.csd.ganymede.DBObject oldObj,
                        arlut.csd.ganymede.DBObject newObj)

This DBObjectDeltaRec constructor is used to generate a delta record that records the difference between two objects for the Ganymede journal

DBObjectDeltaRec

public DBObjectDeltaRec(java.io.DataInput in)
                 throws java.io.IOException

This DBObjectDeltaRec constructor is used to load a delta record from a Journal stream.

Method Detail

emit

public void emit(java.io.DataOutput out)
          throws java.io.IOException

This method emits this delta rec to a file

java.io.IOException

applyDelta

public arlut.csd.ganymede.DBObject applyDelta(arlut.csd.ganymede.DBObject original)

This method takes an object in its original state, and returns a new copy of the object with the changes embodied in this DBObjectDeltaRec applied to it.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object