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Sample Programs from NeXSTEP 3.3

/* DictionaryDataSource.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 EO Development Team
 * Last modified 07/26/94 Mai Nguyen
 *
 * Example of a non-database data source implementation
 */

#import "DictionaryDataSource.h"

@implementation DictionaryDataSource

- init
{
    return [self initWithKeys: nil];
}


- initWithKeys: (NSArray *)k;
{
    [super init];
    array = [[NSMutableArray alloc] init];
    if (k)
	keys = [[NSArray alloc] initWithArray: k];
    return self;
}

- (void)dealloc
{
    [array release];
    [keys dealloc];
    [super dealloc];
}

/* Return a set of keys describing the data bearing objects */
- (NSArray *)keys
{
    return keys;
}


/* Returns a new data bearing object */
- createObject
{
    id anObject = [[NSMutableDictionary alloc] init];
    return anObject;
}


/* Inserts the object in the data source */
- (BOOL)insertObject:object
{
    [array addObject: object];
    return YES;
}

- (BOOL)canDelete
{
    return YES;
}


/* Removes the object from the data source */
- (BOOL)deleteObject:object
{
    [array removeObject: object];
    return YES;
}

/* Saves edits to the object */
- (BOOL)updateObject:object
{
    // NOOP
    return YES;
}

- (NSArray *)fetchObjects
{
    return array;
}

/* Saves insertions, removals and updates to storage */
- (BOOL)saveObjects
{
    return YES;
}

/* Since the DictionaryDataSource does not use an eomodel, this method
 * just returns the value.
 * No type coercion is needed.
 */
- coerceValue: value forKey: (NSString *)key
{
	return value;
}

@end

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