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// Copyright 2020 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 "FirebasePerformance/Sources/Instrumentation/FPRObjectInstrumentor.h"
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#import "FirebasePerformance/Sources/Common/FPRDiagnostics.h"
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#import "FirebasePerformance/Sources/Instrumentation/FPRInstrument_Private.h"
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#import "FirebasePerformance/Sources/Instrumentation/FPRSelectorInstrumentor.h"
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#import <GoogleUtilities/GULObjectSwizzler.h>
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@interface FPRObjectInstrumentor () {
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// The object swizzler instance this instrumentor will use.
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GULObjectSwizzler *_objectSwizzler;
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}
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@end
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@implementation FPRObjectInstrumentor
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- (instancetype)init {
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FPRAssert(NO, @"%@: Please use the designated initializer.", NSStringFromClass([self class]));
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return nil;
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}
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- (instancetype)initWithObject:(id)object {
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self = [super init];
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if (self) {
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_objectSwizzler = [[GULObjectSwizzler alloc] initWithObject:object];
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_instrumentedObject = object;
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}
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return self;
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}
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- (void)copySelector:(SEL)selector fromClass:(Class)aClass isClassSelector:(BOOL)isClassSelector {
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__strong id instrumentedObject = _instrumentedObject;
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if (instrumentedObject && ![instrumentedObject respondsToSelector:selector]) {
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_hasModifications = YES;
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[_objectSwizzler copySelector:selector fromClass:aClass isClassSelector:isClassSelector];
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}
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}
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- (void)swizzle {
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if (_hasModifications) {
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[_objectSwizzler swizzle];
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}
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}
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@end
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