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Annotation of Examples/EnterpriseObjects/QueryByExample/QBEPalette/DictionaryDataSource.m, revision 1.1

1.1     ! root        1: /* DictionaryDataSource.m:
        !             2:  * You may freely copy, distribute, and reuse the code in this example.
        !             3:  * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
        !             4:  * fitness for any particular use.
        !             5:  *
        !             6:  * Written by EO Development Team
        !             7:  * Last modified 07/26/94 Mai Nguyen
        !             8:  *
        !             9:  * Example of a non-database data source implementation
        !            10:  */
        !            11: 
        !            12: #import "DictionaryDataSource.h"
        !            13: 
        !            14: @implementation DictionaryDataSource
        !            15: 
        !            16: - init
        !            17: {
        !            18:     return [self initWithKeys: nil];
        !            19: }
        !            20: 
        !            21: 
        !            22: - initWithKeys: (NSArray *)k;
        !            23: {
        !            24:     [super init];
        !            25:     array = [[NSMutableArray alloc] init];
        !            26:     if (k)
        !            27:        keys = [[NSArray alloc] initWithArray: k];
        !            28:     return self;
        !            29: }
        !            30: 
        !            31: - (void)dealloc
        !            32: {
        !            33:     [array release];
        !            34:     [keys dealloc];
        !            35:     [super dealloc];
        !            36: }
        !            37: 
        !            38: /* Return a set of keys describing the data bearing objects */
        !            39: - (NSArray *)keys
        !            40: {
        !            41:     return keys;
        !            42: }
        !            43: 
        !            44: 
        !            45: /* Returns a new data bearing object */
        !            46: - createObject
        !            47: {
        !            48:     id anObject = [[NSMutableDictionary alloc] init];
        !            49:     return anObject;
        !            50: }
        !            51: 
        !            52: 
        !            53: /* Inserts the object in the data source */
        !            54: - (BOOL)insertObject:object
        !            55: {
        !            56:     [array addObject: object];
        !            57:     return YES;
        !            58: }
        !            59: 
        !            60: - (BOOL)canDelete
        !            61: {
        !            62:     return YES;
        !            63: }
        !            64: 
        !            65: 
        !            66: /* Removes the object from the data source */
        !            67: - (BOOL)deleteObject:object
        !            68: {
        !            69:     [array removeObject: object];
        !            70:     return YES;
        !            71: }
        !            72: 
        !            73: /* Saves edits to the object */
        !            74: - (BOOL)updateObject:object
        !            75: {
        !            76:     // NOOP
        !            77:     return YES;
        !            78: }
        !            79: 
        !            80: - (NSArray *)fetchObjects
        !            81: {
        !            82:     return array;
        !            83: }
        !            84: 
        !            85: /* Saves insertions, removals and updates to storage */
        !            86: - (BOOL)saveObjects
        !            87: {
        !            88:     return YES;
        !            89: }
        !            90: 
        !            91: /* Since the DictionaryDataSource does not use an eomodel, this method
        !            92:  * just returns the value.
        !            93:  * No type coercion is needed.
        !            94:  */
        !            95: - coerceValue: value forKey: (NSString *)key
        !            96: {
        !            97:        return value;
        !            98: }
        !            99: 
        !           100: @end

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