err.no Git - sope/blob - sope-gdl1/GDLAccess/EOSelectSQLExpression.m

   1 /*
   2    EOSQLExpression.m
   3
   4    Copyright (C) 1996 Free Software Foundation, Inc.
   5
   6    Author: Ovidiu Predescu <ovidiu@bx.logicnet.ro>
   7    Date: September 1996
   8
   9    This file is part of the GNUstep Database Library.
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Library General Public
  13    License as published by the Free Software Foundation; either
  14    version 2 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Library General Public License for more details.
  20
  21    You should have received a copy of the GNU Library General Public
  22    License along with this library; see the file COPYING.LIB.
  23    If not, write to the Free Software Foundation,
  24    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25 */
  26
  27 #include "EOSQLExpression.h"
  28 #include "EOAttribute.h"
  29 #include "EOAdaptor.h"
  30 #include "common.h"
  31
  32 #if LIB_FOUNDATION_LIBRARY
  33 #  include <extensions/DefaultScannerHandler.h>
  34 #  include <extensions/PrintfFormatScanner.h>
  35 #else
  36 #  include "DefaultScannerHandler.h"
  37 #  include "PrintfFormatScanner.h"
  38 #endif
  39
  40 @interface EOSelectScannerHandler : DefaultScannerHandler
  41 {
  42     EOAttribute *attribute;
  43     EOAdaptor   *adaptor;
  44     NSString    *alias;
  45 }
  46
  47 - (void)setAttribute:(EOAttribute*)attribute
  48   adaptor:(EOAdaptor*)adaptor
  49   alias:(NSString*)alias;
  50
  51 @end
  52
  53 @implementation EOSelectSQLExpression
  54
  55 - (NSString *)expressionValueForAttribute:(EOAttribute *)attribute
  56   context:(id)context
  57 {
  58   NSString *alias;
  59   NSString *columnName;
  60   NSString *selectFormat;
  61
  62   alias        = [entitiesAndPropertiesAliases objectForKey:context];
  63   selectFormat = [attribute selectFormat];
  64
  65   //NSLog(@"entitiesAndPropertiesAliases: %@", entitiesAndPropertiesAliases);
  66
  67   if (selectFormat) {
  68     PrintfFormatScanner    *formatScanner;
  69     EOSelectScannerHandler *scannerHandler;
  70
  71     formatScanner =
  72       [[[[PrintfFormatScanner alloc] init] setAllowOnlySpecifier:YES]
  73         autorelease];
  74     scannerHandler =
  75       [[[EOSelectScannerHandler alloc] init] autorelease];
  76
  77     [scannerHandler setAttribute:attribute adaptor:adaptor alias:alias];
  78     [formatScanner  setFormatScannerHandler:scannerHandler];
  79 #if defined(__s390__)
  80     return [formatScanner performSelector:
  81                             @selector(stringWithFormat:arguments:)
  82                           withObject:selectFormat
  83                           withObject:nil];
  84 #else
  85     return [formatScanner stringWithFormat:selectFormat arguments:NULL];
  86 #endif
  87   }
  88   else {
  89     columnName = adaptor
  90       ? [adaptor formatAttribute:attribute]
  91       : [attribute columnName];
  92
  93     if (alias) {
  94       return [([[NSString alloc] initWithFormat:@"%@.%@",
  95                                  alias, columnName]) autorelease];
  96     }
  97
  98     return columnName;
  99   }
 100 }
 101
 102 @end /* EOSelectSQLExpression */
 103
 104 @implementation EOSelectScannerHandler
 105
 106 - (id)init
 107 {
 108     [super init];
 109
 110     specHandler['A']
 111             = [self methodForSelector:@selector(convertAttribute:scanner:)];
 112     return self;
 113 }
 114
 115 - (void)dealloc
 116 {
 117     RELEASE(self->attribute);
 118     RELEASE(self->adaptor);
 119     RELEASE(self->alias);
 120     [super dealloc];
 121 }
 122
 123 - (void)setAttribute:(EOAttribute*)_attribute
 124   adaptor:(EOAdaptor*)_adaptor
 125   alias:(NSString*)_alias
 126 {
 127     ASSIGN(self->attribute, _attribute);
 128     ASSIGN(self->adaptor,   _adaptor);
 129     ASSIGN(self->alias,     _alias);
 130 }
 131
 132 - (NSString *)convertAttribute:(va_list *)pString
 133   scanner:(FormatScanner *)scanner
 134 {
 135   NSString *columnName;
 136
 137   columnName = (adaptor)
 138     ? [adaptor formatAttribute:self->attribute]
 139     : [self->attribute columnName];
 140
 141   if (alias)
 142     return [NSString stringWithFormat:@"%@.%@", alias, columnName];
 143
 144   return columnName;
 145 }
 146
 147 @end /* EOSelectScannerHandler */