com.webobjects.eoaccess
Class ERXEntityDependencyOrderingDelegate

java.lang.Object
  com.webobjects.eoaccess.ERXEntityDependencyOrderingDelegate

public class ERXEntityDependencyOrderingDelegate
extends Object

EODatabaseContext delegate to order adaptor operations by FK constraints. This prevents most ordering operations on databases like MS SQL that do not support deferred constraints like a real database. The easiest way to use this is:

 ERXDatabaseContextMulticastingDelegate.addDefaultDelegate(new ERXEntityDependencyOrderingDelegate());
 

To turn this on for a Wonder application, just set this property:

 com.webobjects.eoaccess.ERXEntityDependencyOrderingDelegate.active = true
 

Author:

chill

Field Summary

protected NSComparator	adaptorOpComparator
static String	ERXEntityDependencyOrderingDelegateActiveKey

Constructor Summary

ERXEntityDependencyOrderingDelegate()

Method Summary

protected NSComparator	adaptorOpComparator() Lazy creation of an EOAdaptorOpComparator that uses a list of entities that are in FK dependancy order.
boolean	databaseContextShouldHandleDatabaseException(EODatabaseContext dbCtxt, Throwable exception)
NSArray	databaseContextWillPerformAdaptorOperations(EODatabaseContext aDatabaseContext, NSArray adaptorOperations, EOAdaptorChannel adaptorChannel) EODatabaseContext.Delegate method to order a list of adaptor operations.

Methods inherited from class java.lang.Object

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

Field Detail

ERXEntityDependencyOrderingDelegateActiveKey

public static final String ERXEntityDependencyOrderingDelegateActiveKey

See Also:

Constant Field Values

adaptorOpComparator

protected NSComparator adaptorOpComparator

Constructor Detail

ERXEntityDependencyOrderingDelegate

public ERXEntityDependencyOrderingDelegate()

Method Detail

adaptorOpComparator

protected NSComparator adaptorOpComparator()

Lazy creation of an EOAdaptorOpComparator that uses a list of entities that are in FK dependancy order. Enable DEBUG logging to see the ordered list of entity names.

Returns:

EOAdaptorOpComparator that uses a list of entities that are in FK dependancy order

See Also:

EOAdaptorOpComparator

databaseContextWillPerformAdaptorOperations

public NSArray databaseContextWillPerformAdaptorOperations(EODatabaseContext aDatabaseContext,
                                                           NSArray adaptorOperations,
                                                           EOAdaptorChannel adaptorChannel)

EODatabaseContext.Delegate method to order a list of adaptor operations. Uses adaptorOpComparator() for the ordering.

Parameters:

aDatabaseContext - EODatabaseContext that the operations will be executed in

adaptorOperations - list of operations to execute

adaptorChannel - the adaptor channel these will be executed on

Returns:

operations in an order that should avoid FK constraint violations

See Also:

EODatabaseContext.Delegate.databaseContextWillPerformAdaptorOperations(EODatabaseContext, NSArray,EOAdaptorChannel)

databaseContextShouldHandleDatabaseException

public boolean databaseContextShouldHandleDatabaseException(EODatabaseContext dbCtxt,
                                                            Throwable exception)