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Annotation of Examples/EnterpriseObjects/MasteringDetails/EOFExtensions.subproj/KeyGenerator.h, revision 1.1.1.1

1.1       root        1: /* KeyGenerator.h created by cfeder on Wed 26-Oct-1994 */
                      2: 
                      3: #import <eoaccess/eoaccess.h>
                      4: 
                      5: // This code provides an example of a generic key generation facility.
                      6: // This implementation is closely related to the UniqueKey example
                      7: // in /NextDeveloper/Examples/EnterpriseObjects.  See the README file
                      8: // there for more information.
                      9: 
                     10: @interface KeyGenerator : NSObject
                     11: {
                     12:     EODatabaseDataSource *dataSource;
                     13:     EOEntity *entity;
                     14:     id currentMaxRecord;  // uniqued object from the database
                     15:     unsigned lastGranted, lastReserved;
                     16: }
                     17: - initWithEntity:(EOEntity *)entity dataSource:(EODatabaseDataSource *)dataSource;
                     18: - (unsigned)nextKey;
                     19: + keyGeneratorForEntity:(EOEntity *)entity;
                     20:     // Returns a key generator object for the given entity.
                     21:     // If called repeatedly with the same entity, returns the the same object.
                     22: + (unsigned)nexKeyForEntity:(EOEntity *)entity;
                     23:     // Convenience for [[KeyGenerator keyGeneratorForEntity] nextKey]
                     24: 
                     25: @end
                     26: 
                     27: // Informal protocol on object to tell them to assign
                     28: // themselves primary keys.  EO classes may want to override
                     29: // this with their own key generation scheme.  The default implementation
                     30: // uses the KeyGenerator (above).
                     31: @interface NSObject (assignPrimaryKey)
                     32: - (void)assignPrimaryKeyForEntity:(EOEntity *)entity;
                     33:     // uses the key generator to assign a new primary key to the entity
                     34: 
                     35: - (void)assignPrimaryKeyIfNotAlreadyPresentForEntity:(EOEntity *)entity;
                     36:     // does the above only if the object does not already have a
                     37:     // primary key assigned.
                     38: @end

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