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1199 lines (1065 loc) · 28.2 KB
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/** NSSet - Set object to store key/value pairs
Copyright (C) 1995, 1996, 1998 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
Created: Sep 1995
This file is part of the GNUstep Base Library.
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 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 02110 USA.
<title>NSSet class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSAutoreleasePool.h"
#import "Foundation/NSSet.h"
#import "Foundation/NSCoder.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSEnumerator.h"
#import "Foundation/NSKeyValueCoding.h"
#import "Foundation/NSValue.h"
#import "Foundation/NSException.h"
// For private method _decodeArrayOfObjectsForKey:
#import "Foundation/NSKeyedArchiver.h"
#import "GSPrivate.h"
#import "GSFastEnumeration.h"
#import "GSDispatch.h"
@class GSSet;
@interface GSSet : NSObject // Help the compiler
@end
@class GSMutableSet;
@interface GSMutableSet : NSObject // Help the compiler
@end
/**
* <code>NSSet</code> maintains an unordered collection of unique objects
* (according to [NSObject-isEqual:]). When a duplicate object is added
* to the set, it replaces its old copy.
*/
@implementation NSSet
static Class NSSet_abstract_class;
static Class NSMutableSet_abstract_class;
static Class NSSet_concrete_class;
static Class NSMutableSet_concrete_class;
+ (id) allocWithZone: (NSZone*)z
{
if (self == NSSet_abstract_class)
{
return NSAllocateObject(NSSet_concrete_class, 0, z);
}
else
{
return NSAllocateObject(self, 0, z);
}
}
+ (void) initialize
{
if (self == [NSSet class])
{
NSSet_abstract_class = self;
NSSet_concrete_class = [GSSet class];
[NSMutableSet class];
}
}
/**
* New autoreleased empty set.
*/
+ (id) set
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()] init]);
}
/**
* New set containing (unique elements of) objects.
*/
+ (id) setWithArray: (NSArray*)objects
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()]
initWithArray: objects]);
}
/**
* New set containing single object anObject.
*/
+ (id) setWithObject: anObject
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()]
initWithObjects: &anObject count: 1]);
}
/**
* New set containing (unique elements of) objects.
*/
+ (id) setWithObjects: (const id[])objects
count: (NSUInteger)count
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()]
initWithObjects: objects count: count]);
}
/**
* New set with objects in given nil-terminated list.
*/
+ (id) setWithObjects: firstObject, ...
{
id set;
GS_USEIDLIST(firstObject,
set = [[self allocWithZone: NSDefaultMallocZone()]
initWithObjects: __objects count: __count]);
return AUTORELEASE(set);
}
/**
* Copy constructor.
*/
+ (id) setWithSet: (NSSet*)aSet
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()]
initWithSet: aSet]);
}
- (Class) classForCoder
{
return NSSet_abstract_class;
}
/**
* Returns a new copy of the receiver.<br />
* The default abstract implementation of a copy is to use the
* -initWithSet:copyItems: method with the flag set to YES.<br />
* Concrete subclasses generally simply retain and return the receiver.
*/
- (id) copyWithZone: (NSZone*)z
{
NSSet *copy = [NSSet_concrete_class allocWithZone: z];
return [copy initWithSet: self copyItems: YES];
}
/**
* Returns the number of objects stored in the set.
*/
- (NSUInteger) count
{
[self subclassResponsibility: _cmd];
return 0;
}
- (void) encodeWithCoder: (NSCoder*)aCoder
{
if ([aCoder allowsKeyedCoding])
{
/* HACK ... MacOS-X seems to code differently if the coder is an
* actual instance of NSKeyedArchiver
*/
if ([aCoder class] == [NSKeyedArchiver class])
{
[(NSKeyedArchiver*)aCoder _encodeArrayOfObjects: [self allObjects]
forKey: @"NS.objects"];
}
else
{
unsigned i = 0;
NSEnumerator *e = [self objectEnumerator];
id o;
while ((o = [e nextObject]) != nil)
{
NSString *key;
key = [NSString stringWithFormat: @"NS.object.%u", i++];
[(NSKeyedArchiver*)aCoder encodeObject: o forKey: key];
}
}
}
else
{
unsigned count = [self count];
NSEnumerator *e = [self objectEnumerator];
id o;
[aCoder encodeValueOfObjCType: @encode(unsigned) at: &count];
while ((o = [e nextObject]) != nil)
{
[aCoder encodeValueOfObjCType: @encode(id) at: &o];
}
}
}
- (id) initWithCoder: (NSCoder*)aCoder
{
Class c;
c = object_getClass(self);
if (c == NSSet_abstract_class)
{
DESTROY(self);
self = [NSSet_concrete_class allocWithZone: NSDefaultMallocZone()];
return [self initWithCoder: aCoder];
}
else if (c == NSMutableSet_abstract_class)
{
DESTROY(self);
self = [NSMutableSet_concrete_class allocWithZone: NSDefaultMallocZone()];
return [self initWithCoder: aCoder];
}
if ([aCoder allowsKeyedCoding])
{
id array;
array = [(NSKeyedUnarchiver*)aCoder _decodeArrayOfObjectsForKey:
@"NS.objects"];
if (array == nil)
{
unsigned i = 0;
NSString *key;
id val;
array = [NSMutableArray arrayWithCapacity: 2];
key = [NSString stringWithFormat: @"NS.object.%u", i];
val = [(NSKeyedUnarchiver*)aCoder decodeObjectForKey: key];
while (val != nil)
{
[array addObject: val];
i++;
key = [NSString stringWithFormat: @"NS.object.%u", i];
val = [(NSKeyedUnarchiver*)aCoder decodeObjectForKey: key];
}
}
self = [self initWithArray: array];
}
else
{
unsigned count;
[aCoder decodeValueOfObjCType: @encode(unsigned) at: &count];
if (count > 0)
{
unsigned i;
GS_BEGINIDBUF(objs, count);
for (i = 0; i < count; i++)
{
[aCoder decodeValueOfObjCType: @encode(id) at: &objs[i]];
}
self = [self initWithObjects: objs count: count];
while (count-- > 0)
{
[objs[count] release];
}
GS_ENDIDBUF();
}
}
return self;
}
/**
* <p>In MacOS-X class clusters do not have designated initialisers,
* and there is a general rule that -init is treated as the designated
* initialiser of the class cluster, but that other intitialisers
* may not work s expected an would need to be individually overridden
* in any subclass.
* </p>
* <p>GNUstep tries to make it easier to subclass a class cluster,
* by making class clusters follow the same convention as normal
* classes, so the designated initialiser is the <em>richest</em>
* initialiser. This means that all other initialisers call the
* documented designated initialiser (which calls -init only for
* MacOS-X compatibility), and anyone writing a subclass only needs
* to override that one initialiser in order to have all the other
* ones work.
* </p>
* <p>For MacOS-X compatibility, you may also need to override various
* other initialisers. Exactly which ones, you will need to determine
* by trial on a MacOS-X system ... and may vary between releases of
* MacOS-X. So to be safe, on MacOS-X you probably need to re-implement
* <em>all</em> the class cluster initialisers you might use in conjunction
* with your subclass.
* </p>
*/
- (id) init
{
self = [super init];
return self;
}
/** <init /> <override-subclass />
* Initialize to contain (unique elements of) objects.<br />
* Calls -init (which does nothing but maintain MacOS-X compatibility),
* and needs to be re-implemented in subclasses in order to have all
* other initialisers work.
*/
- (id) initWithObjects: (const id[])objects
count: (NSUInteger)count
{
self = [self init];
return self;
}
/**
* If anObject is in set, return it (the copy in the set).
*/
- (id) member: (id)anObject
{
return [self subclassResponsibility: _cmd];
return 0;
}
/**
* Returns a new instance containing the same objects as
* the receiver.<br />
* The default implementation does this by calling the
* -initWithSet:copyItems: method on a newly created object,
* and passing it NO to tell it just to retain the items.
*/
- (id) mutableCopyWithZone: (NSZone*)z
{
NSMutableSet *copy = [NSMutableSet_concrete_class allocWithZone: z];
return [copy initWithSet: self copyItems: NO];
}
/**
* Return enumerator over objects in set. Order is undefined.
*/
- (NSEnumerator*) objectEnumerator
{
return [self subclassResponsibility: _cmd];
}
/**
* Initialize with (unique elements of) objects in given nil-terminated list.
*/
- (id) initWithObjects: firstObject, ...
{
GS_USEIDLIST(firstObject,
self = [self initWithObjects: __objects count: __count]);
return self;
}
/**
* Initialises a newly allocated set by adding all the objects
* in the supplied array to the set.
*/
- (id) initWithArray: (NSArray*)other
{
unsigned count = [other count];
if (count == 0)
{
return [self init];
}
else
{
GS_BEGINIDBUF(objs, count);
if ([other isProxy])
{
unsigned i;
for (i = 0; i < count; i++)
{
objs[i] = [other objectAtIndex: i];
}
}
else
{
[other getObjects: objs];
}
self = [self initWithObjects: objs count: count];
GS_ENDIDBUF();
return self;
}
}
/**
* Initialises a newly allocated set by adding all the objects
* in the supplied set.
*/
- (id) initWithSet: (NSSet*)other copyItems: (BOOL)flag
{
unsigned c = [other count];
id o, e = [other objectEnumerator];
unsigned i = 0;
GS_BEGINIDBUF(os, c);
while ((o = [e nextObject]))
{
if (flag)
os[i] = [o copy];
else
os[i] = o;
i++;
}
self = [self initWithObjects: os count: c];
if (flag)
{
while (i--)
{
[os[i] release];
}
}
GS_ENDIDBUF();
return self;
}
/**
* Initialize with same items as other (items not copied).
*/
- (id) initWithSet: (NSSet*)other
{
return [self initWithSet: other copyItems: NO];
}
/**
* Return array of all objects in set. Order is undefined.
*/
- (NSArray*) allObjects
{
id e = [self objectEnumerator];
unsigned i;
unsigned c = [self count];
NSArray *result = nil;
GS_BEGINIDBUF(k, c);
for (i = 0; i < c; i++)
{
k[i] = [e nextObject];
}
return AUTORELEASE([[NSArray allocWithZone: NSDefaultMallocZone()]
initWithObjects: k count: c]);
GS_ENDIDBUF();
return result;
}
/**
* Return an arbitrary object from set, or nil if this is empty set.
*/
- (id) anyObject
{
if ([self count] == 0)
return nil;
else
{
id e = [self objectEnumerator];
return [e nextObject];
}
}
/**
* Return whether set contains an object equal to this one according
* to [NSObject-isEqual:].
*/
- (BOOL) containsObject: (id)anObject
{
return (([self member: anObject]) ? YES : NO);
}
- (NSUInteger) hash
{
return [self count];
}
/**
* Send each object given message (with no arguments).
* Identical to [-makeObjectsPerformSelector:].
*/
- (void) makeObjectsPerform: (SEL)aSelector
{
id o, e = [self objectEnumerator];
while ((o = [e nextObject]))
[o performSelector: aSelector];
}
/**
* Send each object given message (with no arguments).
* Identical to [-makeObjectsPerform:].
*/
- (void) makeObjectsPerformSelector: (SEL)aSelector
{
id o, e = [self objectEnumerator];
while ((o = [e nextObject]))
[o performSelector: aSelector];
}
/**
* Send each object given message with given argument.
* Identical to [-makeObjectsPerform:withObject:].
*/
- (void) makeObjectsPerformSelector: (SEL)aSelector withObject: argument
{
id o, e = [self objectEnumerator];
while ((o = [e nextObject]))
[o performSelector: aSelector withObject: argument];
}
/**
* Send each object given message with given argument.
* Identical to [-makeObjectsPerformSelector:withObject:].
*/
- (void) makeObjectsPerform: (SEL)aSelector withObject: argument
{
id o, e = [self objectEnumerator];
while ((o = [e nextObject]))
[o performSelector: aSelector withObject: argument];
}
/**
* Return whether set intersection with otherSet is non-empty.
*/
- (BOOL) intersectsSet: (NSSet*) otherSet
{
id o = nil, e = nil;
// -1. If this set is empty, this method should return NO.
if ([self count] == 0)
return NO;
// 0. Loop for all members in otherSet
e = [otherSet objectEnumerator];
while ((o = [e nextObject])) // 1. pick a member from otherSet.
{
if ([self member: o]) // 2. check the member is in this set(self).
return YES;
}
return NO;
}
/**
* Return whether subset of otherSet.
*/
- (BOOL) isSubsetOfSet: (NSSet*) otherSet
{
id o = nil, e = nil;
// -1. members of this set(self) <= that of otherSet
if ([self count] > [otherSet count])
return NO;
// 0. Loop for all members in this set(self).
e = [self objectEnumerator];
while ((o = [e nextObject]))
{
// 1. check the member is in the otherSet.
if ([otherSet member: o])
{
// 1.1 if true -> continue, try to check the next member.
continue ;
}
else
{
// 1.2 if false -> return NO;
return NO;
}
}
// 2. return YES; all members in this set are also in the otherSet.
return YES;
}
- (BOOL) isEqual: (id)other
{
if ([other isKindOfClass: [NSSet class]])
return [self isEqualToSet: other];
return NO;
}
- (NSUInteger)_countForObject: (id)object
{
return 1;
}
/**
* Return whether each set is subset of the other.
*/
- (BOOL) isEqualToSet: (NSSet*)other
{
if ([self count] != [other count])
return NO;
else
{
id o, e = [self objectEnumerator];
while ((o = [e nextObject]))
{
if (![other member: o])
{
return NO;
}
else
{
if ([self _countForObject: o] != [other _countForObject: o])
{
return NO;
}
}
}
}
/* xxx Recheck this. */
return YES;
}
/**
* Returns listing of objects in set.
*/
- (NSString*) description
{
return [self descriptionWithLocale: nil];
}
/**
* Returns listing of objects in set.
*/
- (NSString*) descriptionWithLocale: (id)locale
{
return [[self allObjects] descriptionWithLocale: locale];
}
- (id) valueForKey: (NSString*)key
{
NSEnumerator *e = [self objectEnumerator];
id object = nil;
NSMutableSet *results = [NSMutableSet setWithCapacity: [self count]];
while ((object = [e nextObject]) != nil)
{
id result = [object valueForKey: key];
if (result == nil)
continue;
[results addObject: result];
}
return results;
}
- (id) valueForKeyPath: (NSString*)path
{
id result = (id) nil;
if ([path hasPrefix: @"@"])
{
NSRange r;
r = [path rangeOfString: @"."];
if (r.length == 0)
{
if ([path isEqualToString: @"@count"] == YES)
{
result = [NSNumber numberWithUnsignedInteger: [self count]];
}
else
{
result = [self valueForKey: path];
}
}
else
{
NSString *op = [path substringToIndex: r.location];
NSString *rem = [path substringFromIndex: NSMaxRange(r)];
unsigned count = [self count];
if ([op isEqualToString: @"@count"] == YES)
{
result = [NSNumber numberWithUnsignedInteger: count];
}
else if ([op isEqualToString: @"@avg"] == YES)
{
double d = 0;
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
while ((o = [e nextObject]) != nil)
{
d += [[o valueForKeyPath: rem] doubleValue];
}
d /= count;
}
result = [NSNumber numberWithDouble: d];
}
else if ([op isEqualToString: @"@max"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
if (result == nil
|| [result compare: o] == NSOrderedAscending)
{
result = o;
}
}
}
}
else if ([op isEqualToString: @"@min"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
if (result == nil
|| [result compare: o] == NSOrderedDescending)
{
result = o;
}
}
}
}
else if ([op isEqualToString: @"@sum"] == YES)
{
double d = 0;
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
while ((o = [e nextObject]) != nil)
{
d += [[o valueForKeyPath: rem] doubleValue];
}
}
result = [NSNumber numberWithDouble: d];
}
else if ([op isEqualToString: @"@distinctUnionOfArrays"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [NSMutableSet set];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObjectsFromArray: o];
}
result = [result allObjects];
}
else
{
result = [NSArray array];
}
}
else if ([op isEqualToString: @"@distinctUnionOfObjects"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [NSMutableSet set];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObject: o];
}
result = [result allObjects];
}
else
{
result = [NSArray array];
}
}
else if ([op isEqualToString: @"@distinctUnionOfSets"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [NSMutableSet set];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObjectsFromArray: [o allObjects]];
}
result = [result allObjects];
}
else
{
result = [NSArray array];
}
}
else if ([op isEqualToString: @"@unionOfArrays"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [GSMutableArray array];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObjectsFromArray: o];
}
result = GS_IMMUTABLE(result);
}
else
{
result = [NSArray array];
}
}
else if ([op isEqualToString: @"@unionOfObjects"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [GSMutableArray array];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObject: o];
}
result = GS_IMMUTABLE(result);
}
else
{
result = [NSArray array];
}
}
else if ([op isEqualToString: @"@unionOfSets"] == YES)
{
if (count > 0)
{
NSEnumerator *e = [self objectEnumerator];
id o;
result = [GSMutableArray array];
while ((o = [e nextObject]) != nil)
{
o = [o valueForKeyPath: rem];
[result addObjectsFromArray: [o allObjects]];
}
result = GS_IMMUTABLE(result);
}
else
{
result = [NSArray array];
}
}
else
{
result = [super valueForKeyPath: path];
}
}
}
else
{
result = [super valueForKeyPath: path];
}
return result;
}
- (void) enumerateObjectsUsingBlock: (GSSetEnumeratorBlock)aBlock
{
[self enumerateObjectsWithOptions: 0 usingBlock: aBlock];
}
- (void) enumerateObjectsWithOptions: (NSEnumerationOptions)opts
usingBlock: (GSSetEnumeratorBlock)aBlock
{
BLOCK_SCOPE BOOL shouldStop = NO;
id<NSFastEnumeration> enumerator = self;
GS_DISPATCH_CREATE_QUEUE_AND_GROUP_FOR_ENUMERATION(enumQueue, opts)
FOR_IN (id, obj, enumerator)
{
GS_DISPATCH_SUBMIT_BLOCK(enumQueueGroup,enumQueue, if (shouldStop == NO) {, }, aBlock, obj, &shouldStop);
if (shouldStop)
{
break;
}
}
END_FOR_IN(enumerator)
GS_DISPATCH_TEARDOWN_QUEUE_AND_GROUP_FOR_ENUMERATION(enumQueue, opts)
}
- (NSSet *) objectsPassingTest: (GSSetFilterBlock)aBlock
{
return [self objectsWithOptions: 0 passingTest: aBlock];
}
- (NSSet *) objectsWithOptions: (NSEnumerationOptions)opts
passingTest: (GSSetFilterBlock)aBlock
{
BOOL shouldStop = NO;
id<NSFastEnumeration> enumerator = self;
NSMutableSet *resultSet;
resultSet = [NSMutableSet setWithCapacity: [self count]];
FOR_IN (id, obj, enumerator)
{
BOOL include = CALL_BLOCK(aBlock, obj, &shouldStop);
if (include)
{
[resultSet addObject:obj];
}
if (shouldStop)
{
break;
}
}
END_FOR_IN(enumerator)
return GS_IMMUTABLE(resultSet);
}
/** Return a set formed by adding anObject to the receiver.
*/
- (NSSet *) setByAddingObject: (id)anObject
{
NSMutableSet *m;
NSSet *s;
m = [self mutableCopy];
[m addObject: anObject];
s = [m copy];
[m release];
return [s autorelease];
}
/** Return a set formed by adding the contents of other to the receiver.
*/
- (NSSet *) setByAddingObjectsFromArray: (NSArray *)other
{
NSMutableSet *m;
NSSet *s;
m = [self mutableCopy];
[m addObjectsFromArray: other];
s = [m copy];
[m release];
return [s autorelease];
}
/** Return a set formed as a union of the receiver and other.
*/
- (NSSet *) setByAddingObjectsFromSet: (NSSet *)other
{
NSMutableSet *m;
NSSet *s;
m = [self mutableCopy];
[m unionSet: other];
s = [m copy];
[m release];
return [s autorelease];
}
- (NSUInteger) countByEnumeratingWithState: (NSFastEnumerationState*)state
objects: (id*)stackbuf
count: (NSUInteger)len
{
[self subclassResponsibility: _cmd];
return 0;
}