darling-cocotron/CoreData/NSEntityDescription.m

/* Copyright (c) 2008 Dan Knapp

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#import "NSEntityDescription-Private.h"
#import <CoreData/NSAttributeDescription.h>
#import <CoreData/NSManagedObject.h>
#import <CoreData/NSManagedObjectContext.h>
#import <CoreData/NSManagedObjectModel.h>
#import <CoreData/NSPersistentStoreCoordinator.h>
#import <CoreData/NSPropertyDescription.h>
#import <CoreData/NSRelationshipDescription.h>
#import <Foundation/NSKeyedUnarchiver.h>
#import <Foundation/NSRaise.h>
#import <ctype.h>
#import <objc/objc-class.h>
#import <stdint.h>
#import <string.h>

@implementation NSEntityDescription

static id getValue(id self, SEL selector) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    id result = [self valueForKey: [property name]];
    return result;
}

static void setValue(id self, SEL selector, id newValue) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    [self setValue: newValue forKey: [property name]];
}

static void addObject(id self, SEL selector, id value) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    NSMutableSet *set = [self mutableSetValueForKey: [property name]];

    [set addObject: value];
}

static void removeObject(id self, SEL selector, id value) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    NSMutableSet *set = [self mutableSetValueForKey: [property name]];
    [set removeObject: value];
}

static void addObjectSet(id self, SEL selector, NSSet *values) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    NSMutableSet *set = [self mutableSetValueForKey: [property name]];
    [set unionSet: values];
}

static void removeObjectSet(id self, SEL selector, NSSet *values) {
    NSPropertyDescription *property =
            [[self entity] _propertyForSelector: selector];
    NSMutableSet *set = [self mutableSetValueForKey: [property name]];
    [set minusSet: values];
}

id keyObjectForSelector(SEL selector) {
    return [NSNumber numberWithInteger: (NSInteger) selector];
}

static void appendMethodToList(Class class, NSString *selectorName, IMP imp,
                               const char *types, SEL *selectorp)
{

    SEL selector = NSSelectorFromString(selectorName);

    class_addMethod(class, selector, imp, types);

    *selectorp = selector;
}

- initWithCoder: (NSCoder *) coder {
    if (![coder allowsKeyedCoding]) {
        [NSException raise: NSInvalidArgumentException
                    format: @"%@ can not initWithCoder:%@", [self class],
                            [coder class]];
        return nil;
    }

    _className = [[coder decodeObjectForKey: @"NSClassNameForEntity"] retain];
    _name = [[coder decodeObjectForKey: @"NSEntityName"] retain];
    _model = [coder decodeObjectForKey: @"NSManagedObjectModel"];
    _properties = [[coder decodeObjectForKey: @"NSProperties"] retain];
    _subentities = [[coder decodeObjectForKey: @"NSSubentities"] retain];
    _superentity = [[coder decodeObjectForKey: @"NSSuperentity"] retain];
    _userInfo = [[coder decodeObjectForKey: @"NSUserInfo"] retain];
    _versionHashModifier =
            [[coder decodeObjectForKey: @"NSVersionHashModifier"] retain];

    _selectorPropertyMap = [[NSMutableDictionary alloc] init];

    _hasBeenInstantiated = NO;

    if (_className) {
        Class class = NSClassFromString(_className);

        for (NSPropertyDescription *property in [_properties allValues]) {
            NSString *propertyName = [property name];
            NSString *upperName = [[[propertyName substringToIndex: 1]
                    uppercaseString]
                    stringByAppendingString: [propertyName
                                                     substringFromIndex: 1]];
            NSString *selectorName;
            SEL selector;

            appendMethodToList(class, propertyName, (IMP) getValue,
                               "@@:", &selector);
            [_selectorPropertyMap setObject: property
                                     forKey: keyObjectForSelector(selector)];

            appendMethodToList(
                    class, [NSString stringWithFormat: @"set%@:", upperName],
                    (IMP) setValue, "v@:@", &selector);
            [_selectorPropertyMap setObject: property
                                     forKey: keyObjectForSelector(selector)];

            if ([property isKindOfClass: [NSRelationshipDescription class]]) {
                NSRelationshipDescription *relationship =
                        (NSRelationshipDescription *) property;

                if ([relationship isToMany]) {
                    appendMethodToList(
                            class,
                            [NSString stringWithFormat: @"add%@Object:",
                                                        upperName],
                            (IMP) addObject, "v@:@", &selector);
                    [_selectorPropertyMap
                            setObject: property
                               forKey: keyObjectForSelector(selector)];

                    appendMethodToList(
                            class,
                            [NSString stringWithFormat: @"remove%@Object:",
                                                        upperName],
                            (IMP) removeObject, "v@:@", &selector);
                    [_selectorPropertyMap
                            setObject: property
                               forKey: keyObjectForSelector(selector)];

                    appendMethodToList(
                            class,
                            [NSString stringWithFormat: @"add%@:", upperName],
                            (IMP) addObjectSet, "v@:@", &selector);
                    [_selectorPropertyMap
                            setObject: property
                               forKey: keyObjectForSelector(selector)];

                    appendMethodToList(class,
                                       [NSString stringWithFormat: @"remove%@:",
                                                                   upperName],
                                       (IMP) removeObjectSet, "v@:@",
                                       &selector);
                    [_selectorPropertyMap
                            setObject: property
                               forKey: keyObjectForSelector(selector)];
                }
            }
        }
    }
    return self;
}

- (NSString *) description {
    return [NSString stringWithFormat: @"<NSEntityDescription %@>", _name];
}

- (NSPropertyDescription *) _propertyForSelector: (SEL) selector {
    id keyObject = keyObjectForSelector(selector);
    NSEntityDescription *entity;

    for (entity = self; entity; entity = [entity superentity]) {
        NSPropertyDescription *result =
                [entity->_selectorPropertyMap objectForKey: keyObject];

        if (result)
            return result;
    }
    return nil;
}

- (BOOL) _hasBeenInstantiated {
    return _hasBeenInstantiated;
}

/*
- (BOOL) _computeAttribute: (NSAttributeDescription *) attribute
                          getter: (IMP *) getter
                          setter: (IMP *) setter
{
    switch([attribute attributeType]) {
    case NSUndefinedAttributeType:
        NSLog(@"Undefined-type attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSInteger16AttributeType:
        NSLog(@"Integer 16 attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSInteger32AttributeType:
        *getter = (IMP) getInt32;
        *setter = (IMP) setInt32;
        return [NSString stringWithUTF8String: @encode(int32_t)];

    case NSInteger64AttributeType:
        NSLog(@"Integer 64 attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSDecimalAttributeType:
        NSLog(@"Decimal attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSDoubleAttributeType:
        NSLog(@"Double attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSFloatAttributeType:
        NSLog(@"Float attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSStringAttributeType:
        *getter = (IMP) getString;
        *setter = (IMP) setString;
        return [NSString stringWithUTF8String: @encode(NSString *)];

    case NSBooleanAttributeType:
        *getter = (IMP) getBool;
        *setter = (IMP) setBool;
        return [NSString stringWithUTF8String: @encode(BOOL)];

    case NSDateAttributeType:
        NSLog(@"Date attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSBinaryDataAttributeType:
        NSLog(@"Binary data attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    case NSTransformableAttributeType:
        NSLog(@"Transformable attributes not implemented for %@.%@",
              _className, [attribute name]);
        return NO;

    default:
        NSLog(@"Unknown attribute type for %@.%@",
              _className, [attribute name]);
        return NO;
    }
}
*/

+ (NSEntityDescription *) entityForName: (NSString *) entityName
                 inManagedObjectContext: (NSManagedObjectContext *) context
{
    NSDictionary *entities = [[[context persistentStoreCoordinator]
            managedObjectModel] entitiesByName];

    return [entities objectForKey: entityName];
}

+ insertNewObjectForEntityForName: (NSString *) entityName
           inManagedObjectContext: (NSManagedObjectContext *) context
{
    NSEntityDescription *entity = [self entityForName: entityName
                               inManagedObjectContext: context];
    NSString *className = [entity managedObjectClassName];
    Class class;

    if (className)
        class = NSClassFromString(className);
    else {
        NSLog(@"Unable to find class %@ specified by entity %@ in the runtime",
              className, [entity name]);

        class = [NSManagedObject class];
    }

    return [[class alloc] initWithEntity: entity
            insertIntoManagedObjectContext: context];
}

- (NSManagedObjectModel *) managedObjectModel {
    return _model;
}

- (NSString *) name {
    return _name;
}

- (BOOL) isAbstract {
    return _isAbstract;
}

- (NSString *) managedObjectClassName {
    // should probably init _className like this but initWithCoder logic needs
    // to be changed
    if (_className == nil)
        return @"NSManagedObject";

    return _className;
}

- (NSArray *) properties {
    return [_properties allValues];
}

- (NSArray *) subentities {
    return [_subentities allValues];
}

- (NSDictionary *) userInfo {
    return _userInfo;
}

- (void) setName: (NSString *) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    value = [value copy];
    [_name release];
    _name = value;
}

- (void) setAbstract: (BOOL) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    _isAbstract = value;
}

- (void) setManagedObjectClassName: (NSString *) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    value = [value copy];
    [_className release];
    _className = value;
}

- (void) setProperties: (NSArray *) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    NSUnimplementedMethod();
}

- (void) setSubentities: (NSArray *) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    NSUnimplementedMethod();
}

- (void) setUserInfo: (NSDictionary *) value {
    if (_hasBeenInstantiated) {
        NSLog(@"Attempt to modify entity after instantiating it.");
        return;
    }

    value = [value copy];
    [_userInfo release];
    _userInfo = value;
}

- (NSEntityDescription *) superentity {
    return _superentity;
}

- (NSDictionary *) subentitiesByName {
    NSUnimplementedMethod();
    return nil;
}

- (NSDictionary *) attributesByName {
    NSMutableDictionary *result = [NSMutableDictionary dictionary];

    for (NSPropertyDescription *check in [_properties allValues]) {
        if ([check isKindOfClass: [NSAttributeDescription class]]) {
            [result setObject: check forKey: [check name]];
        }
    }

    return result;
}

- (NSDictionary *) propertiesByName {
    return _properties;
}

- (NSDictionary *) relationshipsByName {
    NSMutableDictionary *result = [NSMutableDictionary dictionary];

    for (NSPropertyDescription *check in [_properties allValues]) {
        if ([check isKindOfClass: [NSRelationshipDescription class]])
            [result setObject: check forKey: [check name]];
    }

    return result;
}

- (NSArray *) relationshipsWithDestinationEntity: (NSEntityDescription *) entity
{
    NSMutableArray *result = [NSMutableArray array];

    for (NSPropertyDescription *check in [_properties allValues]) {
        if ([check isKindOfClass: [NSRelationshipDescription class]]) {
            if ([[check entity] isEqual: entity])
                [result addObject: check];
        }
    }

    return result;
}

- (BOOL) _isKindOfEntity: (NSEntityDescription *) other {
    NSEntityDescription *check = self;

    for (; check != nil; check = check->_superentity)
        if (check == other)
            return YES;

    return NO;
}

@end