// 
// Copyright 2021 New Vector Ltd
//
// 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

/**
 Used to avoid retain cycles by creating a proxy that holds a weak reference to the original object.
 One example of that would be using CADisplayLink, which strongly retains its target, when manually invalidating it is unfeasable.
 */
class WeakObjectWrapper: NSObject {
    
    private weak var wrappedObject: AnyObject?
    
    init(_ object: AnyObject) {
        wrappedObject = object
    }
    
    override func responds(to aSelector: Selector!) -> Bool {
        return (wrappedObject?.responds(to: aSelector) ?? false) || super.responds(to: aSelector)
    }
    
    override func forwardingTarget(for aSelector: Selector!) -> Any? {
        return wrappedObject
    }
}