EarlGrey/Action/GREYAction.h
//
// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
/**
* A protocol for actions that are performed on accessibility elements.
*/
@protocol GREYAction<NSObject>
/**
* Perform the action specified by the GREYAction object on an @c element if and only if the
* @c element matches the constraints of the action.
*
* @param element The element the action is to be performed on. This must not be @c nil.
* @param[out] errorOrNil Error that will be populated on failure. The implementing class should
* handle the behavior when it is @c nil by, for example, logging the error
* or throwing an exception.
*
* @return @c YES if the action succeeded, else @c NO. If an action returns @c NO, it does not
* mean that the action was not performed at all but somewhere during the action execution
* the error occurred and so the UI may be in an unrecoverable state.
*/
- (BOOL)perform:(id)element error:(__strong NSError *_Nullable *)errorOrNil;
/**
* A method to get the name of this action.
*
* @return The name of the action. If the action fails, then the name is printed along with all
* other relevant information.
*/
- (NSString *)name;
@end
NS_ASSUME_NONNULL_END