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// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import <objc/runtime.h>
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#import "GoogleUtilities/ISASwizzler/GULObjectSwizzler+Internal.h"
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#import "GoogleUtilities/ISASwizzler/Public/GoogleUtilities/GULSwizzledObject.h"
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NSString *kGULSwizzlerAssociatedObjectKey = @"gul_objectSwizzler";
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@interface GULSwizzledObject ()
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@end
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@implementation GULSwizzledObject
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+ (void)copyDonorSelectorsUsingObjectSwizzler:(GULObjectSwizzler *)objectSwizzler {
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[objectSwizzler copySelector:@selector(gul_objectSwizzler) fromClass:self isClassSelector:NO];
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[objectSwizzler copySelector:@selector(gul_class) fromClass:self isClassSelector:NO];
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// This is needed because NSProxy objects usually override -[NSObjectProtocol respondsToSelector:]
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// and ask this question to the underlying object. Since we don't swizzle the underlying object
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// but swizzle the proxy, when someone calls -[NSObjectProtocol respondsToSelector:] on the proxy,
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// the answer ends up being NO even if we added new methods to the subclass through ISA Swizzling.
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// To solve that, we override -[NSObjectProtocol respondsToSelector:] in such a way that takes
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// into account the fact that we've added new methods.
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if ([objectSwizzler isSwizzlingProxyObject]) {
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[objectSwizzler copySelector:@selector(respondsToSelector:) fromClass:self isClassSelector:NO];
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}
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}
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- (instancetype)init {
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NSAssert(NO, @"Do not instantiate this class, it's only a donor class");
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return nil;
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}
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- (GULObjectSwizzler *)gul_objectSwizzler {
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return [GULObjectSwizzler getAssociatedObject:self key:kGULSwizzlerAssociatedObjectKey];
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}
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#pragma mark - Donor methods
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- (Class)gul_class {
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return [[self gul_objectSwizzler] generatedClass];
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}
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// Only added to a class when we detect it is a proxy.
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- (BOOL)respondsToSelector:(SEL)aSelector {
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Class gulClass = [[self gul_objectSwizzler] generatedClass];
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return [gulClass instancesRespondToSelector:aSelector] || [super respondsToSelector:aSelector];
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}
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@end
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