2 * Copyright 2018 Google
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #import <Foundation/Foundation.h>
19 NS_ASSUME_NONNULL_BEGIN
21 /// A dependency on a specific protocol's functionality.
22 NS_SWIFT_NAME(Dependency)
23 @interface FIRDependency : NSObject
25 /// The protocol describing functionality being depended on.
26 @property(nonatomic, strong, readonly) Protocol *protocol;
28 /// A flag to specify if the dependency is required or not.
29 @property(nonatomic, readonly) BOOL isRequired;
31 /// Initializes a dependency that is required. Calls `initWithProtocol:isRequired` with `YES` for
32 /// the required parameter.
33 /// Creates a required dependency on the specified protocol's functionality.
34 + (instancetype)dependencyWithProtocol:(Protocol *)protocol;
36 /// Creates a dependency on the specified protocol's functionality and specify if it's required for
37 /// the class's functionality.
38 + (instancetype)dependencyWithProtocol:(Protocol *)protocol isRequired:(BOOL)required;
40 /// Use `dependencyWithProtocol:isRequired:` instead.
41 - (instancetype)init NS_UNAVAILABLE;