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Annotation of Examples/EnterpriseObjects/FlatFileDataSource/AppController.m, revision 1.1.1.1

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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