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* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses) With permission of the Facebook Open Source team, we are simplifying the Texture license so that clients can rely on the Apache 2 terms that most of Texture is already covered by. This means that code originally forked from AsyncDisplayKit will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a PATENTS file. After getting confirmation that the updates to these core files look good, we'll propagate this new license header to all files (in this same PR) and get sign-off from all parties before landing. * [License] Update all Texture source files to be pure Apache 2. * Changelog entry for Apache 2 license update. * Revert "[License] Update all Texture source files to be pure Apache 2." This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b. * [License] Update all Texture source files to be pure Apache 2, maintaining copyrights. * [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
73 lines
2.4 KiB
Objective-C
73 lines
2.4 KiB
Objective-C
//
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// ASWeakProxy.m
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASWeakProxy.h>
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#import <AsyncDisplayKit/ASObjectDescriptionHelpers.h>
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#import <AsyncDisplayKit/ASAssert.h>
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@implementation ASWeakProxy
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- (instancetype)initWithTarget:(id)target
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{
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if (self) {
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_target = target;
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}
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return self;
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}
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+ (instancetype)weakProxyWithTarget:(id)target NS_RETURNS_RETAINED
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{
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return [[ASWeakProxy alloc] initWithTarget:target];
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}
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- (id)forwardingTargetForSelector:(SEL)aSelector
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{
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return _target;
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}
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- (BOOL)respondsToSelector:(SEL)aSelector
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{
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return [_target respondsToSelector:aSelector];
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}
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- (BOOL)conformsToProtocol:(Protocol *)aProtocol
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{
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return [_target conformsToProtocol:aProtocol];
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}
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/// Strangely, this method doesn't get forwarded by ObjC.
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- (BOOL)isKindOfClass:(Class)aClass
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{
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return [_target isKindOfClass:aClass];
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}
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- (NSString *)description
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{
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return ASObjectDescriptionMake(self, @[@{ @"target": _target ?: (id)kCFNull }]);
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}
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- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
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{
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ASDisplayNodeAssertNil(_target, @"ASWeakProxy got %@ when its target is still alive, which is unexpected.", NSStringFromSelector(_cmd));
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// Unfortunately, in order to get this object to work properly, the use of a method which creates an NSMethodSignature
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// from a C string. -methodSignatureForSelector is called when a compiled definition for the selector cannot be found.
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// This is the place where we have to create our own dud NSMethodSignature. This is necessary because if this method
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// returns nil, a selector not found exception is raised. The string argument to -signatureWithObjCTypes: outlines
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// the return type and arguments to the message. To return a dud NSMethodSignature, pretty much any signature will
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// suffice. Since the -forwardInvocation call will do nothing if the target does not respond to the selector,
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// the dud NSMethodSignature simply gets us around the exception.
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return [NSMethodSignature signatureWithObjCTypes:"@^v^c"];
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}
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- (void)forwardInvocation:(NSInvocation *)invocation
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{
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ASDisplayNodeAssertNil(_target, @"ASWeakProxy got %@ when its target is still alive, which is unexpected.", NSStringFromSelector(_cmd));
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}
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@end
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