GSPersistentStore.m

/* Implementation of the GSPersistentStore class for the GNUstep
   Core Data framework.
   Copyright (C) 2005 Free Software Foundation, Inc.
 
   Written by:  Saso Kiselkov <diablos@manga.sk>
   Date: August 2005
 
   This file is part of the GNUstep Core Data framework.
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 USA.
*/
 
#import "CoreDataHeaders.h"
#import "GSPersistentStore.h"
 
#include <stdlib.h>
#include <time.h>
 
#ifdef HAVE_NATIVE_OBJC_EXCEPTIONS
# define SUBCLASS_OVERRIDE_ERROR \
   @throw [NSException exceptionWithName: NSInternalInconsistencyException \
                                  reason: [NSString stringWithFormat: \
     _(@"Subclass %@ didn't override `%@'."), [self className], \
     NSStringFromSelector(_cmd)] \
                                userInfo: nil]
#else
# define SUBCLASS_OVERRIDE_ERROR \
   [NSException raise: NSInternalInconsistencyException \
               format: _(@"Subclass %@ didn't override `%@'."), \
     [self className], NSStringFromSelector(_cmd)]
#endif
 
// the lock with which we protect access to the randomizer's
// state setup.
static NSRecursiveLock * randomizerLock = nil;
static struct drand48_data randomizerSetup;
 
// store UUIDs are 256-bits long
#define STORE_UUID_SIZE   (256 / 8) /* bits */

static NSString *
GenerateNewRandomUUID (void)
{
  NSString * hexaValue = @"";
  unsigned int i;
 
  [randomizerLock lock];
 
  // Generate a random number which may be up to 256-bits (i.e. up to
  // 64 hexa-digits) long.
  for (i = 0; i < (STORE_UUID_SIZE / sizeof(long int)); i++)
    {
      long int result;
      lrand48_r (&randomizerSetup, &result);
      hexaValue = [NSString stringWithFormat: @"%@%X", hexaValue, result];
    }
 
  [randomizerLock unlock];
 
  return hexaValue;
}

 
@implementation GSPersistentStore
 
+ (void) initialize
{
  if (randomizerLock == nil)
    {
      // initialize the randomizerSetup protection lock
      randomizerLock = [NSRecursiveLock new];
 
      // setup the randomizer
      srand48_r(time(NULL), &randomizerSetup);
    }
}
 
- (void) dealloc
{
  TEST_RELEASE(_URL);
  TEST_RELEASE(_model);
  TEST_RELEASE(_configuration);
  TEST_RELEASE(_metadata);
  TEST_RELEASE(_versionNumbers);
 
  [super dealloc];
}

-       initWithURL: (NSURL *) URL
 managedObjectModel: (NSManagedObjectModel *) model
      configuration: (NSString *) configuration
            options: (NSDictionary *) options
{
  if ([self init])
    {
      ASSIGN(_URL, URL);
      ASSIGN(_model, model);
      ASSIGN(_configuration, configuration);
 
      _metadata = [[NSDictionary alloc]
        initWithObjectsAndKeys:
        GenerateNewRandomUUID(), NSStoreUUIDKey,
        [self storeType], NSStoreTypeKey,
        nil];
 
      _versionNumbers = [NSMutableDictionary new];
 
      return self;
    }
  else
    {
      return nil;
    }
}

- (NSURL *) URL
{
  return _URL;
}

- (NSString *) configuration
{
  return _configuration;
}

- (void) setUUID: (NSString *) UUID
{
  NSMutableDictionary * metadata;
 
  metadata = [[_metadata mutableCopy] autorelease];
  [metadata setObject: UUID
               forKey: NSStoreUUIDKey];
  ASSIGN(_metadata, [[metadata copy] autorelease]);
}

- (void) setMetadata: (NSDictionary *) metadata
{
  NSMutableDictionary * newMetadata = [[metadata mutableCopy] autorelease];
 
  // copy the old values
  [newMetadata setObject: [_metadata objectForKey: NSStoreUUIDKey]
                  forKey: NSStoreUUIDKey];
  [newMetadata setObject: [self storeType] forKey: NSStoreTypeKey];
 
  ASSIGN(_metadata, [[newMetadata copy] autorelease]);
}

- (NSDictionary *) metadata
{
  return _metadata;
}
 
- (BOOL) saveObjects: (NSSet *) objects
               error: (NSError **) error
{
  NSEnumerator * e = [objects objectEnumerator];
  NSManagedObject * managedObject;
 
  // increment the storage number for non-fault objects
  while ((managedObject = [e nextObject]) != nil)
    {
      if (![managedObject isFault])
        {
          unsigned long long version;
          NSManagedObjectID * objectID = [managedObject objectID];
 
          NSAssert([objectID persistentStore] == self, _(@"Tried to store "
            @"a managed object in a different persistent store than where "
            @"it belongs."));
 
          version = [[_versionNumbers objectForKey: objectID]
            unsignedLongLongValue];
          version++;
          [_versionNumbers
            setObject: [NSNumber numberWithUnsignedLongLong: version]
               forKey: objectID];
        }
    }
 
  // and write the objects
//  return [self writeWithObjects: objects error: error];
  return NO;
}
 
- (unsigned long long) storageNumberForObjectID: (NSManagedObjectID *) objectID
{
  return [[_versionNumbers objectForKey: objectID] unsignedLongLongValue];
}

- (NSString *) storeType
{
  SUBCLASS_OVERRIDE_ERROR;
 
  return nil;
}

- (NSDictionary *) fetchObjectsWithEntity: (NSEntityDescription *) entity
                                predicate: (NSPredicate *) predicate
                                    error: (NSError **) error
{
  SUBCLASS_OVERRIDE_ERROR;
 
  return nil;
}

- (NSDictionary *) fetchObjectWithID: (NSManagedObjectID *) objectID
                     fetchProperties: (NSSet *) properties
                               error: (NSError **) error
{
  SUBCLASS_OVERRIDE_ERROR;
 
  return nil;
}

- (BOOL) writeSavingObjects: (NSSet *) objectsToWrite
            deletingObjects: (NSSet *) objectIDsToDelete
                      error: (NSError **) error
{
  SUBCLASS_OVERRIDE_ERROR;
 
  return NO;
}
 
@end