/*
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* Copyright 2018 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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*/
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#import <Foundation/Foundation.h>
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@class GDTCOREvent;
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NS_ASSUME_NONNULL_BEGIN
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/** Defines the API that event transformers must adopt. */
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@protocol GDTCOREventTransformer <NSObject>
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@required
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/** Transforms an event by applying some logic to it. Events returned can be nil, for example, in
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* instances where the event should be sampled.
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*
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* @param event The event to transform.
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* @return A transformed event, or nil if the transformation dropped the event.
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*/
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- (nullable GDTCOREvent *)transform:(GDTCOREvent *)event;
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@end
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NS_ASSUME_NONNULL_END
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