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org.apache.derby.impl.store.raw.data
Class UpdateFieldOperation  

java.lang.Object
  org.apache.derby.impl.store.raw.data.PageBasicOperation
      org.apache.derby.impl.store.raw.data.LogicalPageOperation
          org.apache.derby.impl.store.raw.data.UpdateFieldOperation

All Implemented Interfaces:

java.io.Externalizable, org.apache.derby.iapi.services.io.Formatable, org.apache.derby.iapi.store.raw.Loggable, org.apache.derby.iapi.store.raw.LogicalUndoable, org.apache.derby.iapi.store.raw.RePreparable, java.io.Serializable, org.apache.derby.iapi.services.io.TypedFormat, org.apache.derby.iapi.store.raw.Undoable

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public final class UpdateFieldOperation

extends LogicalPageOperation

Represents the update of a particular field of a row on a page.

Field Summary



protected  int
doMeSlot



           



protected  int
fieldId



           



protected  org.apache.derby.iapi.util.ByteArray
preparedLog



           


 


Fields inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation


recordId, undo


 


Fields inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation


containerHdl, foundHere, page


 


Fields inherited from interface org.apache.derby.iapi.store.raw.Loggable


ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK


 






Constructor Summary


UpdateFieldOperation()



           


UpdateFieldOperation(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                     BasePage page,
                     int slot,
                     int recordId,
                     int fieldId,
                     java.lang.Object column,
                     org.apache.derby.iapi.store.access.conglomerate.LogicalUndo undo)



           


 






Method Summary



 void
doMe(org.apache.derby.iapi.store.raw.Transaction xact,
     org.apache.derby.iapi.store.raw.log.LogInstant instant,
     org.apache.derby.iapi.services.io.LimitObjectInput in)



          Change the value of a field.



 org.apache.derby.iapi.util.ByteArray
getPreparedLog()



          The log operations are responsible to create the ByteArray, and the log
                operations should write out any optional data for the change to the 
        ByteArray.



 int
getTypeFormatId()



          Return my format identifier.



 void
readExternal(java.io.ObjectInput in)



          Read this in



 void
restoreLoggedRow(java.lang.Object[] row,
                 org.apache.derby.iapi.services.io.LimitObjectInput in)



          Restore the row stored in the optional data of the log record.



 void
restoreMe(org.apache.derby.iapi.store.raw.Transaction xact,
          BasePage undoPage,
          org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
          org.apache.derby.iapi.services.io.LimitObjectInput in)



          restore the before image of the page



 java.lang.String
toString()



          DEBUG: Print self.



 void
undoMe(org.apache.derby.iapi.store.raw.Transaction xact,
       BasePage undoPage,
       int undoRecordId,
       org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
       org.apache.derby.iapi.services.io.LimitObjectInput in)



          Restore field to its old value.



 void
writeExternal(java.io.ObjectOutput out)



          This method is responsible for writing the instance data of an object
 to the passed in stream.



private  void
writeOptionalDataToBuffer(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                          java.lang.Object column)



          Write the old column value and and new column value as optional data.


 


Methods inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation


generateUndo, getContainer, getRecordHandle, reclaimPrepareLocks, resetRecordHandle


 


Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation


findpage, getPage, getPageForLoadTran, getPageId, getPageVersion, group, needsRedo, releaseResource, resetPageNumber


 


Methods inherited from class java.lang.Object


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


 


Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable


group, needsRedo, releaseResource


 








Field Detail




doMeSlot
protected int doMeSlot







fieldId
protected int fieldId







preparedLog
protected transient org.apache.derby.iapi.util.ByteArray preparedLog











Constructor Detail




UpdateFieldOperation
public UpdateFieldOperation(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                            BasePage page,
                            int slot,
                            int recordId,
                            int fieldId,
                            java.lang.Object column,
                            org.apache.derby.iapi.store.access.conglomerate.LogicalUndo undo)
                     throws org.apache.derby.iapi.error.StandardException





UpdateFieldOperation
public UpdateFieldOperation()









Method Detail




writeExternal
public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Description copied from interface: java.io.Externalizable
This method is responsible for writing the instance data of an object
 to the passed in stream.  Note that this stream is not a subclass of
 OutputStream, but rather is a class that implements the
 ObjectOutput interface.  That interface provides a 
 number of methods
 for writing Java data values to a stream.
 

 Not that the implementation of this method must be coordinated with
 the implementation of readExternal.


Specified by:
writeExternal in interface java.io.Externalizable
Overrides:
writeExternal in class LogicalPageOperation








readExternal
public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Read this in


Specified by:
readExternal in interface java.io.Externalizable
Overrides:
readExternal in class LogicalPageOperation








getTypeFormatId
public int getTypeFormatId()

Return my format identifier.








doMe
public void doMe(org.apache.derby.iapi.store.raw.Transaction xact,
                 org.apache.derby.iapi.store.raw.log.LogInstant instant,
                 org.apache.derby.iapi.services.io.LimitObjectInput in)
          throws org.apache.derby.iapi.error.StandardException,
                 java.io.IOException

Change the value of a field.








undoMe
public void undoMe(org.apache.derby.iapi.store.raw.Transaction xact,
                   BasePage undoPage,
                   int undoRecordId,
                   org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
                   org.apache.derby.iapi.services.io.LimitObjectInput in)
            throws org.apache.derby.iapi.error.StandardException,
                   java.io.IOException

Restore field to its old value.


Specified by:
undoMe in class LogicalPageOperation








restoreLoggedRow
public void restoreLoggedRow(java.lang.Object[] row,
                             org.apache.derby.iapi.services.io.LimitObjectInput in)
                      throws org.apache.derby.iapi.error.StandardException,
                             java.io.IOException

Restore the row stored in the optional data of the log record.








restoreMe
public void restoreMe(org.apache.derby.iapi.store.raw.Transaction xact,
                      BasePage undoPage,
                      org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
                      org.apache.derby.iapi.services.io.LimitObjectInput in)
               throws org.apache.derby.iapi.error.StandardException,
                      java.io.IOException

restore the before image of the page


Specified by:
restoreMe in class PageBasicOperation








getPreparedLog
public org.apache.derby.iapi.util.ByteArray getPreparedLog()

Description copied from interface: org.apache.derby.iapi.store.raw.Loggable
The log operations are responsible to create the ByteArray, and the log
                operations should write out any optional data for the change to the 
        ByteArray.
                The ByteArray can be prepared when the log operation is constructed,
                or it can be prepared when getPreparedLog() is called.

                Called by the log manager to allow the log operation to pass the buffer
                which contains optional data that will be available in to doMe() 
        methods.


Specified by:
getPreparedLog in interface org.apache.derby.iapi.store.raw.Loggable
Overrides:
getPreparedLog in class PageBasicOperation








writeOptionalDataToBuffer
private void writeOptionalDataToBuffer(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                                       java.lang.Object column)
                                throws org.apache.derby.iapi.error.StandardException,
                                       java.io.IOException

Write the old column value and and new column value as optional data.
          If logical undo, writes out the entire row's before image.








toString
public java.lang.String toString()

DEBUG: Print self.


Overrides:
toString in class PageBasicOperation














  

  
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