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

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

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat

public final class TriggerInfo
extends java.lang.Object
implements Formatable

This is a simple class used to store the run time information about a foreign key. Used by DML to figure out what to check.

See Also:

Serialized Form

Field Summary

(package private) int[]	columnIds
(package private) java.lang.String[]	columnNames
(package private) TriggerDescriptor[]	triggerArray This class implements Formatable.

Constructor Summary

	TriggerInfo() Niladic constructor for Formattable
	TriggerInfo(TableDescriptor td, int[] changedCols, GenericDescriptorList triggers) Constructor for TriggerInfo
private	TriggerInfo(TriggerDescriptor[] triggers, int[] changedColsIds, java.lang.String[] changedColsNames)

Method Summary

(package private) TriggerDescriptor[]	getTriggerArray()
int	getTypeFormatId() Get the formatID which corresponds to this class.
(package private) boolean	hasTrigger(boolean isBefore, boolean isRow) Do we have a trigger or triggers that meet the criteria
private boolean	hasTrigger(java.lang.Boolean isBefore, java.lang.Boolean isRow) Do we have a trigger or triggers that meet the criteria
void	readExternal(java.io.ObjectInput in) Read this object from a stream of stored objects.
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out) Write this object out

Methods inherited from class java.lang.Object

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

Field Detail

triggerArray

TriggerDescriptor[] triggerArray

This class implements Formatable. That means that it can write itself to and from a formatted stream. If you add more fields to this class, make sure that you also write/read them with the writeExternal()/readExternal() methods. If, inbetween releases, you add more fields to this class, then you should bump the version number emitted by the getTypeFormatId() method. OR, since this is something that is used in stored prepared statements, it is ok to change it if you make sure that stored prepared statements are invalidated across releases.

columnNames

java.lang.String[] columnNames

columnIds

int[] columnIds

Constructor Detail

TriggerInfo

public TriggerInfo()

Niladic constructor for Formattable

TriggerInfo

public TriggerInfo(TableDescriptor td,
                   int[] changedCols,
                   GenericDescriptorList triggers)

Constructor for TriggerInfo

Parameters:

td - the table upon which the trigger is declared

changedCols - the columns that are changed in the dml that is causing the trigger to fire

triggers - the list of trigger descriptors

TriggerInfo

private TriggerInfo(TriggerDescriptor[] triggers,
                    int[] changedColsIds,
                    java.lang.String[] changedColsNames)

Method Detail

hasTrigger

boolean hasTrigger(boolean isBefore,
                   boolean isRow)

Do we have a trigger or triggers that meet the criteria

Parameters:

isBefore - true for a before trigger, false for after trigger, null for either

isRow - true for a row trigger, false for statement trigger, null for either

Returns:

true if we have a trigger that meets the criteria

hasTrigger

private boolean hasTrigger(java.lang.Boolean isBefore,
                           java.lang.Boolean isRow)

Do we have a trigger or triggers that meet the criteria

Parameters:

isBefore - true for a before trigger, false for after trigger, null for either

isRow - true for a row trigger, false for statement trigger, null for either

Returns:

true if we have a trigger that meets the criteria

getTriggerArray

TriggerDescriptor[] getTriggerArray()

writeExternal

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

Write this object out

Specified by:

writeExternal in interface java.io.Externalizable

Parameters:

out - write bytes here

Throws:

java.io.IOException - thrown on error

readExternal

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

Read this object from a stream of stored objects.

Specified by:

readExternal in interface java.io.Externalizable

Parameters:

in - read this.

Throws:

java.io.IOException - thrown on error

java.lang.ClassNotFoundException - thrown on error

getTypeFormatId

public int getTypeFormatId()

Get the formatID which corresponds to this class.

Specified by:

getTypeFormatId in interface TypedFormat

Returns:

the formatID of this class

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object