org.apache.derby.impl.sql.execute
Class TriggerEventActivator

java.lang.Object
  org.apache.derby.impl.sql.execute.TriggerEventActivator

public class TriggerEventActivator
extends java.lang.Object

Responsible for firing a trigger or set of triggers based on an event.

Field Summary

private Activation	activation
private java.util.Vector	aiCounters
private ConnectionContext	cc
private int	dmlType
private GenericTriggerExecutor[][]	executors
private LanguageConnectionContext	lcc
private java.lang.String	statementText
private UUID	tableId
private java.lang.String	tableName
private TransactionController	tc
private InternalTriggerExecutionContext	tec
private TriggerInfo	triggerInfo

Constructor Summary

TriggerEventActivator(LanguageConnectionContext lcc, TransactionController tc, UUID tableId, TriggerInfo triggerInfo, int dmlType, Activation activation, java.util.Vector aiCounters)
Basic constructor

Method Summary

void	cleanup() Clean up and release resources.
void	notifyEvent(TriggerEvent event, CursorResultSet brs, CursorResultSet ars, int[] colsReadFromTable) Handle the given event.
(package private) void	reopen() Reopen the trigger activator.
private void	setupExecutors(TriggerInfo triggerInfo)

Methods inherited from class java.lang.Object

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

Field Detail

lcc

private LanguageConnectionContext lcc

tc

private TransactionController tc

triggerInfo

private TriggerInfo triggerInfo

tec

private InternalTriggerExecutionContext tec

executors

private GenericTriggerExecutor[][] executors

activation

private Activation activation

cc

private ConnectionContext cc

statementText

private java.lang.String statementText

dmlType

private int dmlType

tableId

private UUID tableId

tableName

private java.lang.String tableName

aiCounters

private java.util.Vector aiCounters

Constructor Detail

TriggerEventActivator

public TriggerEventActivator(LanguageConnectionContext lcc,
                             TransactionController tc,
                             UUID tableId,
                             TriggerInfo triggerInfo,
                             int dmlType,
                             Activation activation,
                             java.util.Vector aiCounters)
                      throws StandardException

Basic constructor

Parameters:

lcc - the lcc

tc - the xact controller

triggerInfo - the trigger information

dmlType - Type of DML for which this trigger is being fired.

activation - the activation.

aiCounters - vector of ai counters

Throws:

StandardException - on error

Method Detail

reopen

void reopen()
      throws StandardException

Reopen the trigger activator. Just creates a new trigger execution context. Note that close() still must be called when you are done -- you cannot just do a reopen() w/o a first doing a close.

Throws:

StandardException - on error

setupExecutors

private void setupExecutors(TriggerInfo triggerInfo)
                     throws StandardException

Throws:

StandardException

notifyEvent

public void notifyEvent(TriggerEvent event,
                        CursorResultSet brs,
                        CursorResultSet ars,
                        int[] colsReadFromTable)
                 throws StandardException

Handle the given event.

Parameters:

event - a trigger event

brs - the before result set. Typically a TemporaryRowHolderResultSet but sometimes a BulkTableScanResultSet

ars - the after result set. Typically a TemporaryRowHolderResultSet but sometimes a BulkTableScanResultSet

colsReadFromTable - columns required from the trigger table by the triggering sql

Throws:

StandardException - on error

cleanup

public void cleanup()
             throws StandardException

Clean up and release resources.

Throws:

StandardException - on unexpected error