/*
 * Copyright 2018 Google
 *
 * 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 "Firestore/Source/Core/FSTListenSequence.h"

NS_ASSUME_NONNULL_BEGIN

#pragma mark - FSTListenSequence

@interface FSTListenSequence () {
  FSTListenSequenceNumber _previousSequenceNumber;
}

@end

@implementation FSTListenSequence

#pragma mark - Constructors

- (instancetype)initStartingAfter:(FSTListenSequenceNumber)after {
  self = [super init];
  if (self) {
    _previousSequenceNumber = after;
  }
  return self;
}

#pragma mark - Public methods

- (FSTListenSequenceNumber)next {
  _previousSequenceNumber++;
  return _previousSequenceNumber;
}

@end

NS_ASSUME_NONNULL_END