ftp.nice.ch/pub/next/developer/objc/dbkit/AssociationExample.92.9.s.tar.gz#/AssociationExample/QualifiedAssociation.m

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/* QualifiedAssociation.m:
 * You may freely copy, distribute, and reuse the code in this example.
 * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
 * fitness for any particular use.
 *
 * Written by Mai Nguyen, NeXT Developer Support
 *
 */

#import "QualifiedAssociation.h"

@implementation QualifiedAssociation

- setValue:value
{
	[[self destination] fetchContentsOf:value usingQualifier:dbQualifier];
	return self;
}

- setQualifier: qualifier
{
	dbQualifier = (DBQualifier *)qualifier;
	return self;
}

- qualifier
{
	return dbQualifier;
}


/*  C function to set up a custom association between the master fetchgroup
 *  and the detail fetchgroup.
 */

QualifiedAssociation * setUpAssociation(DBFetchGroup * dbFetchGroup)
{
	DBModule * 				dbModule;
	DBAssociation * 		dbAssociation;
	DBExpression *			dbExpression;
	DBFetchGroup *			masterFetchGroup;
	QualifiedAssociation *	qualifiedAssociation;
	
		
	/* Get a hold of the association from master fetchgroup to detail
	 * fetchgroup
	 */
	dbModule = [dbFetchGroup module];
	dbAssociation = [dbModule associationForObject:dbFetchGroup];
	dbExpression = [dbAssociation expression];
	masterFetchGroup = [dbAssociation fetchGroup];
		/* Remove the association from the master fetchgroup
		 */
	[masterFetchGroup removeAssociation:dbAssociation];
	qualifiedAssociation = [[QualifiedAssociation alloc]
				 	initFetchGroup:masterFetchGroup
					expression: dbExpression
					destination: dbFetchGroup ];
			
	[masterFetchGroup addAssociation:qualifiedAssociation];
	
		/* Free old association */
	[dbAssociation free];
	return qualifiedAssociation;
}

@end

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