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Annotation of Examples/EnterpriseObjects/FlatFileDataSource/AppController.m, revision 1.1

1.1     ! root        1: /* AppController.m
        !             2:  *
        !             3:  * Sets up an EOController and a DataSource objects which are not based on an underlying
        !             4:  * RDBMS.
        !             5:  * 
        !             6:  * You may freely copy, distribute, and reuse the code in this example.
        !             7:  * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
        !             8:  * fitness for any particular use.
        !             9:  *
        !            10:  * 
        !            11:  */
        !            12: 
        !            13: #import <eoaccess/eoaccess.h>
        !            14: #import <eointerface/eointerface.h>
        !            15: #import<foundation/NSString.h>
        !            16: #import <foundation/NSException.h>
        !            17: 
        !            18: #import "AppController.h"
        !            19: #import "TableDataSource.h"
        !            20: 
        !            21: @implementation AppController
        !            22: 
        !            23: 
        !            24: #define EXAMPLE_MODEL @"example"
        !            25: #define PRODUCT_ENTITY @"Product"
        !            26: #define DATABASE @"DATABASE"
        !            27: 
        !            28: void MyTopLevelErrorHandler(NXHandler *errorState);
        !            29: 
        !            30: - awakeFromNib {
        !            31:        NSString *modelPath = [EOModel findPathForModelNamed:EXAMPLE_MODEL];
        !            32:        EOEntity *productEntity;
        !            33:        TableDataSource *masterSource;
        !            34:        EOModel *model;
        !            35:        NSString *databasePath;
        !            36: 
        !            37:        
        !            38:        NXSetTopLevelErrorHandler(MyTopLevelErrorHandler);
        !            39:        
        !            40:        if (!modelPath) {
        !            41:                NSString *emess = [NSString stringWithFormat:@"Cannot find path for model %@", EXAMPLE_MODEL];
        !            42:                NXRunAlertPanel("ERROR", [emess cString], "OK", NULL, NULL);
        !            43:                return self;
        !            44:        }
        !            45: 
        !            46:        // Get the Product entity from the model. We are in trouble if it is not there!!!
        !            47:        model = [[EOModel alloc] initWithContentsOfFile:modelPath];
        !            48:        [model autorelease];
        !            49:        if ( !(productEntity = [model entityNamed:PRODUCT_ENTITY]) ) {
        !            50:                NSString *emess = [NSString stringWithFormat:@"Cannot find entity %@ in model %@", PRODUCT_ENTITY,  EXAMPLE_MODEL];
        !            51:                NXRunAlertPanel("ERROR", [emess cString], "OK", NULL, NULL);
        !            52:                return self;
        !            53:        }
        !            54: 
        !            55:        // Instantiate a TableDataSource for the product entity and connect
        !            56:        // the product controller to it.
        !            57:        // The detail item data source will be automatically created and attached to
        !            58:        // the detail controller (look at the qualified association set in IB
        !            59:        // that connects the master controller (Product) to its detail (Item).
        !            60:        // The association key is @"toItem"). That's the only thing that needs to be done, 
        !            61:        // et voila...
        !            62:        databasePath = [NSString stringWithFormat:@"%@/../%@", [self applicationPath], DATABASE];
        !            63:        masterSource = [[TableDataSource alloc] initWithEntity:productEntity tablePath:databasePath];
        !            64:        [masterSource autorelease];
        !            65:        if (!masterSource) {
        !            66:                NSString *emess = [NSString stringWithCString:"Cannot access the flat file database!!! You need to set the absolute path to the flat file db (AppController.m) or run the application from the example directory..."];
        !            67:                NXRunAlertPanel("ERROR", [emess cString], "OK", NULL, NULL);
        !            68:                return self;
        !            69:        }
        !            70:        [productController setDataSource:masterSource];
        !            71:        [productController fetch:self];
        !            72:        return self;
        !            73: }
        !            74: 
        !            75: void MyTopLevelErrorHandler(NXHandler *errorState)
        !            76: {
        !            77:        if (errorState->code >= NSExceptionBase &&
        !            78:           errorState->code <= NSLastException) {
        !            79:           NSException *exception = (id) errorState->data1;
        !            80: 
        !            81:         NSLog(@"%@: %@\n", [exception exceptionName], [exception exceptionReason]);
        !            82:            }
        !            83: }
        !            84: 
        !            85: #undef EXAMPLE_MODEL
        !            86: #undef PRODUCT_ENTITY
        !            87: #undef DATABASE
        !            88: 
        !            89: - (NSString *)applicationPath {
        !            90:        int           i;
        !            91:        NSString   *appPathName = nil;
        !            92: 
        !            93:        for (i = strlen(NXArgv[0]) - 1; (i >= 0) && (NXArgv[0][i] != '/'); i--);
        !            94:        appPathName = [NSString stringWithCString:NXArgv[0] length:i];
        !            95:        if (NXArgv[0][0] != '/') {
        !            96:                char path[MAXPATHLEN+1];
        !            97:                appPathName = [NSString stringWithFormat:@"%s/%@", getwd(path), appPathName];
        !            98:        }
        !            99:        return appPathName;
        !           100: }
        !           101: 
        !           102: 
        !           103: @end

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