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

1.1       root        1: /* DetailTableDataSource.m
                      2:  *
                      3:  * A data source implementation for a detail table.
                      4:  * 
                      5:  * You may freely copy, distribute, and reuse the code in this example.
                      6:  * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
                      7:  * fitness for any particular use.
                      8:  *
                      9:  * 
                     10:  */
                     11: 
                     12: 
                     13: 
                     14: #import <appkit/appkit.h>
                     15: #import <eoaccess/eoaccess.h>
                     16: #import "DetailTableDataSource.h"
                     17: #import "TableDataSourcePrivate.h"
                     18: 
                     19: @implementation DetailTableDataSource
                     20: 
                     21: - initWithMasterDataSource:(TableDataSource *)masterSource entity:(EOEntity *)detailEntity {
                     22:        NSString *primaryKey;
                     23:        NSArray *relations;
                     24:        int i;
                     25:        NSMutableArray *qualifiers = [[[NSMutableArray alloc] init] autorelease];
                     26: 
                     27:        [super init];
                     28:        entity = [detailEntity retain];
                     29:        master = [masterSource retain];
                     30:        orderByKey=nil;
                     31:        
                     32:        primaryKey = [(EOAttribute *)[[entity primaryKeyAttributes] objectAtIndex:0] name];
                     33:        relations = [entity relationships];
                     34:        for (i=0; i<[relations count]; i++) {
                     35:                EORelationship *rel=[relations objectAtIndex:i];
                     36: 
                     37:                if ([rel isToMany]) {
                     38:                        EOAttribute *attr = [[rel sourceAttributes] objectAtIndex:0];
                     39:                        if (!attr) continue;
                     40:                        else [qualifiers addObject:[attr name]];
                     41:                }
                     42:        }
                     43:        relations = [[master entity] relationships];
                     44:        for (i=0; i<[relations count]; i++) {
                     45:                EORelationship *rel=[relations objectAtIndex:i];
                     46: 
                     47:                if ([rel isToMany] && [entity isEqual:[rel destinationEntity]]) {
                     48:                        EOAttribute *attr = [[rel destinationAttributes] objectAtIndex:0];
                     49:                        if (!attr) continue;
                     50:                        else [qualifiers addObject:[attr name]];
                     51:                }
                     52:        }
                     53: 
                     54:        return [self initWithTable:[master tablePath] primaryKey:primaryKey qualifierKeys:qualifiers];
                     55: }
                     56: 
                     57: - (void)qualifyWithRelationshipKey:key ofObject:sourceObject {
                     58: 
                     59:        EORelationship *rel = [[master entity] relationshipNamed:key];
                     60:        NSMutableDictionary *qual;
                     61:        EOAttribute *source = [[rel sourceAttributes] objectAtIndex:0];
                     62:        EOAttribute *dest = [[rel destinationAttributes] objectAtIndex:0];
                     63: 
                     64:        if (!rel) {
                     65:                NSLog(@"Master source does not have relationship for key %@", [(NSString *)key description]);
                     66:                [self setQualifier:nil];
                     67:        }
                     68:        else if (!source || !dest) {
                     69:                NSLog(@"Master source does not have source or destination attribute");
                     70:                [self setQualifier:nil];
                     71:        }
                     72:        else if (!sourceObject) {
                     73:                [self setQualifier:nil];
                     74:        }
                     75:        else {
                     76:                id linkValue;
                     77:                linkValue = [sourceObject objectForKey:[source name]];
                     78:                if (linkValue) {
                     79:                        qual = [[[NSMutableDictionary alloc] init] autorelease];
                     80:                        [qual setObject:[dest name] forKey:@QPROPERTY];
                     81:                        [qual setObject:linkValue forKey:@QVALUE];
                     82:                        [self setQualifier:qual];
                     83:                }
                     84:                else [self setQualifier:nil];
                     85:        }       
                     86:        /*[masterObject autorelease];
                     87:        masterObject=[sourceObject retain];
                     88:        [masterKey autorelease];
                     89:        masterKey=[key retain];*/
                     90: }
                     91: 
                     92: - createObject{
                     93:        NSMutableDictionary *newObject = [super createObject];
                     94:        NSArray *relations = [[master entity] relationships];
                     95:        int i;
                     96: 
                     97:        if (!newObject) return nil;
                     98:        for (i=0; i<[relations count]; i++) {
                     99:                EORelationship *rel=[relations objectAtIndex:i];
                    100: 
                    101:                if ( ([rel isToMany]) && ([entity isEqual:[rel destinationEntity]]) ) {
                    102:                        EOAttribute *attr = [[rel destinationAttributes] objectAtIndex:0];
                    103:                        NSString *key = [attr name];
                    104: 
                    105:                        if (!attr) continue;
                    106:                        if ( ![key isEqual:[qualifier objectForKey:@QPROPERTY]] ) {
                    107:                                NSLog(@"qualifier %@ differs from relationship key %@ to create detail object %@", 
                    108:                                        [(NSMutableDictionary *)qualifier description], key, [entity name]);
                    109:                                continue;
                    110:                        }
                    111:                        else [newObject setObject:[qualifier objectForKey:@QVALUE] forKey:key];
                    112:                }
                    113:        }
                    114: 
                    115: 
                    116:        return newObject;
                    117: }
                    118: 
                    119: 
                    120: @end

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