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-rw-r--r--Foundation/GTMNSEnumerator+Filter.m221
1 files changed, 0 insertions, 221 deletions
diff --git a/Foundation/GTMNSEnumerator+Filter.m b/Foundation/GTMNSEnumerator+Filter.m
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index cc1cb41..0000000
--- a/Foundation/GTMNSEnumerator+Filter.m
+++ /dev/null
@@ -1,221 +0,0 @@
-//
-// GTMNSEnumerator+Filter.m
-//
-// Copyright 2007-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy
-// of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
-//
-
-#import "GTMNSEnumerator+Filter.h"
-#import "GTMDebugSelectorValidation.h"
-#import "GTMDefines.h"
-#if GTM_IPHONE_SDK
-#import <objc/message.h>
-#import <objc/runtime.h>
-#else
-#import <objc/objc-runtime.h>
-#endif
-
-// a private subclass of NSEnumerator that does all the work.
-// public interface just returns one of these.
-// This top level class contains all the additional boilerplate. Specific
-// behavior is in the subclasses.
-@interface GTMEnumeratorPrivateBase : NSEnumerator {
- @protected
- NSEnumerator *base_;
- SEL operation_; // either a predicate or a transform depending on context.
- id target_; // may be nil
- id object_; // may be nil
-}
-@end
-
-@interface GTMEnumeratorPrivateBase (SubclassesMustProvide)
-- (BOOL)filterObject:(id)obj returning:(id *)resultp;
-@end
-
-@implementation GTMEnumeratorPrivateBase
-- (id)initWithBase:(NSEnumerator *)base
- sel:(SEL)filter
- target:(id)optionalTarget
- object:(id)optionalOther {
- self = [super init];
- if (self) {
-
- // someone would have to subclass or directly create an object of this
- // class, and this class is private to this impl.
- _GTMDevAssert(base, @"can't initWithBase: a nil base enumerator");
- base_ = [base retain];
- operation_ = filter;
- target_ = [optionalTarget retain];
- object_ = [optionalOther retain];
- }
- return self;
-}
-
-// we don't provide an init because this base class is private to this
-// impl, and no one would be able to create it (if they do, they get whatever
-// they happens...).
-
-- (void)dealloc {
- [base_ release];
- [target_ release];
- [object_ release];
- [super dealloc];
-}
-
-- (id)nextObject {
- for (id obj = [base_ nextObject]; obj; obj = [base_ nextObject]) {
- id result = nil;
- if ([self filterObject:obj returning:&result]) {
- return result;
- }
- }
- return nil;
-}
-@end
-
-// a transformer, for each item in the enumerator, returns a f(item).
-@interface GTMEnumeratorTransformer : GTMEnumeratorPrivateBase
-@end
-@implementation GTMEnumeratorTransformer
-- (BOOL)filterObject:(id)obj returning:(id *)resultp {
- *resultp = [obj performSelector:operation_ withObject:object_];
- return nil != *resultp;
-}
-@end
-
-// a transformer, for each item in the enumerator, returns a f(item).
-// a target transformer swaps the target and the argument.
-@interface GTMEnumeratorTargetTransformer : GTMEnumeratorPrivateBase
-@end
-@implementation GTMEnumeratorTargetTransformer
-- (BOOL)filterObject:(id)obj returning:(id *)resultp {
- *resultp = [target_ performSelector:operation_
- withObject:obj
- withObject:object_];
- return nil != *resultp;
-}
-@end
-
-// a filter, for each item in the enumerator, if(f(item)) { returns item. }
-@interface GTMEnumeratorFilter : GTMEnumeratorPrivateBase
-@end
-@implementation GTMEnumeratorFilter
-// We must take care here, since Intel leaves junk in high bytes of return
-// register for predicates that return BOOL.
-// For details see:
-// http://developer.apple.com/legacy/mac/library/documentation/MacOSX/Conceptual/universal_binary/universal_binary_tips/universal_binary_tips.html#//apple_ref/doc/uid/TP40002217-CH239-280661
-// and
-// http://www.red-sweater.com/blog/320/abusing-objective-c-with-class#comment-83187
-- (BOOL)filterObject:(id)obj returning:(id *)resultp {
- *resultp = obj;
- return ((BOOL (*)(id, SEL, id))objc_msgSend)(obj, operation_, object_);
-}
-@end
-
-// a target filter, for each item in the enumerator, if(f(item)) { returns item. }
-// a target transformer swaps the target and the argument.
-@interface GTMEnumeratorTargetFilter : GTMEnumeratorPrivateBase
-@end
-@implementation GTMEnumeratorTargetFilter
-// We must take care here, since Intel leaves junk in high bytes of return
-// register for predicates that return BOOL.
-// For details see:
-// http://developer.apple.com/legacy/mac/library/documentation/MacOSX/Conceptual/universal_binary/universal_binary_tips/universal_binary_tips.html#//apple_ref/doc/uid/TP40002217-CH239-280661
-// and
-// http://www.red-sweater.com/blog/320/abusing-objective-c-with-class#comment-83187
-- (BOOL)filterObject:(id)obj returning:(id *)resultp {
- *resultp = obj;
- return ((BOOL (*)(id, SEL, id, id))objc_msgSend)(target_, operation_, obj, object_);
-}
-@end
-
-@implementation NSEnumerator (GTMEnumeratorFilterAdditions)
-
-- (NSEnumerator *)gtm_filteredEnumeratorByMakingEachObjectPerformSelector:(SEL)selector
- withObject:(id)argument {
- return [[[GTMEnumeratorFilter alloc] initWithBase:self
- sel:selector
- target:nil
- object:argument] autorelease];
-}
-
-- (NSEnumerator *)gtm_enumeratorByMakingEachObjectPerformSelector:(SEL)selector
- withObject:(id)argument {
- return [[[GTMEnumeratorTransformer alloc] initWithBase:self
- sel:selector
- target:nil
- object:argument] autorelease];
-}
-
-
-- (NSEnumerator *)gtm_filteredEnumeratorByTarget:(id)target
- performOnEachSelector:(SEL)predicate {
- // make sure the object impls this selector taking an object as an arg.
- GTMAssertSelectorNilOrImplementedWithReturnTypeAndArguments(target, predicate,
- @encode(BOOL),
- @encode(id),
- NULL);
- return [[[GTMEnumeratorTargetFilter alloc] initWithBase:self
- sel:predicate
- target:target
- object:nil] autorelease];
-}
-
-- (NSEnumerator *)gtm_filteredEnumeratorByTarget:(id)target
- performOnEachSelector:(SEL)predicate
- withObject:(id)object {
- // make sure the object impls this selector taking an object as an arg.
- GTMAssertSelectorNilOrImplementedWithReturnTypeAndArguments(target, predicate,
- @encode(BOOL),
- @encode(id),
- @encode(id),
- NULL);
- return [[[GTMEnumeratorTargetFilter alloc] initWithBase:self
- sel:predicate
- target:target
- object:object] autorelease];
-}
-
-- (NSEnumerator *)gtm_enumeratorByTarget:(id)target
- performOnEachSelector:(SEL)selector {
- // make sure the object impls this selector taking an object as an arg.
- GTMAssertSelectorNilOrImplementedWithReturnTypeAndArguments(target, selector,
- @encode(id),
- @encode(id),
- NULL);
- return [[[GTMEnumeratorTargetTransformer alloc] initWithBase:self
- sel:selector
- target:target
- object:nil]
- autorelease];
-}
-
-- (NSEnumerator *)gtm_enumeratorByTarget:(id)target
- performOnEachSelector:(SEL)selector
- withObject:(id)object {
- // make sure the object impls this selector taking an object as an arg.
- GTMAssertSelectorNilOrImplementedWithReturnTypeAndArguments(target, selector,
- @encode(id),
- @encode(id),
- @encode(id),
- NULL);
- return [[[GTMEnumeratorTargetTransformer alloc] initWithBase:self
- sel:selector
- target:target
- object:object]
- autorelease];
-}
-
-@end
-
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