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           // Copyright 2019 Google
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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 "FirebaseABTesting/Sources/Public/FirebaseABTesting/FIRLifecycleEvents.h"
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           #import "FirebaseABTesting/Sources/Public/FirebaseABTesting/FIRExperimentController.h"
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           /// Default name of the analytics event to be logged when an experiment is set.
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           NSString *const FIRSetExperimentEventName = @"_exp_set";
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           /// Default name of the analytics event to be logged when an experiment is activated.
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           NSString *const FIRActivateExperimentEventName = @"_exp_activate";
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           /// Default name of the analytics event to be logged when an experiment is cleared.
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           NSString *const FIRClearExperimentEventName = @"_exp_clear";
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           /// Default name of the analytics event to be logged when an experiment times out for being
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           /// activated.
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           NSString *const FIRTimeoutExperimentEventName = @"_exp_timeout";
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           /// Default name of the analytics event to be logged when an experiment is expired as it reaches the
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           /// end of TTL.
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           NSString *const FIRExpireExperimentEventName = @"_exp_expire";
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           /// Prefix for lifecycle event names.
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           static NSString *const kLifecycleEventPrefix = @"_";
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           @implementation FIRLifecycleEvents
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           - (instancetype)init {
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             self = [super init];
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             if (self) {
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               _setExperimentEventName = FIRSetExperimentEventName;
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               _activateExperimentEventName = FIRActivateExperimentEventName;
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               _clearExperimentEventName = FIRClearExperimentEventName;
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               _timeoutExperimentEventName = FIRTimeoutExperimentEventName;
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               _expireExperimentEventName = FIRExpireExperimentEventName;
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             }
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             return self;
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           }
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           - (void)setSetExperimentEventName:(NSString *)setExperimentEventName {
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             if (setExperimentEventName && [setExperimentEventName hasPrefix:kLifecycleEventPrefix]) {
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               _setExperimentEventName = setExperimentEventName;
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             } else {
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               _setExperimentEventName = FIRSetExperimentEventName;
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             }
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           }
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           - (void)setActivateExperimentEventName:(NSString *)activateExperimentEventName {
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             if (activateExperimentEventName &&
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                 [activateExperimentEventName hasPrefix:kLifecycleEventPrefix]) {
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               _activateExperimentEventName = activateExperimentEventName;
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             } else {
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               _activateExperimentEventName = FIRActivateExperimentEventName;
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             }
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           }
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           - (void)setClearExperimentEventName:(NSString *)clearExperimentEventName {
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             if (clearExperimentEventName && [clearExperimentEventName hasPrefix:kLifecycleEventPrefix]) {
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               _clearExperimentEventName = clearExperimentEventName;
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             } else {
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               _clearExperimentEventName = FIRClearExperimentEventName;
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             }
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           }
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           - (void)setTimeoutExperimentEventName:(NSString *)timeoutExperimentEventName {
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             if (timeoutExperimentEventName && [timeoutExperimentEventName hasPrefix:kLifecycleEventPrefix]) {
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               _timeoutExperimentEventName = timeoutExperimentEventName;
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             } else {
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               _timeoutExperimentEventName = FIRTimeoutExperimentEventName;
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             }
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           }
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           - (void)setExpireExperimentEventName:(NSString *)expireExperimentEventName {
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             if (expireExperimentEventName && [_timeoutExperimentEventName hasPrefix:kLifecycleEventPrefix]) {
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               _expireExperimentEventName = expireExperimentEventName;
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             } else {
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               _expireExperimentEventName = FIRExpireExperimentEventName;
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             }
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           }
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           @end
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