Chapter 11 - Chat App/ChatAppFinished/Pods/FirebaseDatabase/Firebase/Database/Core/Operation/FOperationSource.m
/*
 * Copyright 2017 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 "FOperationSource.h"
#import "FPath.h"
#import "FQueryParams.h"

@interface FOperationSource ()
@property (nonatomic, readwrite) BOOL fromUser;
@property (nonatomic, readwrite) BOOL fromServer;
@property (nonatomic, readwrite) BOOL isTagged;
@property (nonatomic, strong, readwrite) FQueryParams *queryParams;
@end

@implementation FOperationSource

@synthesize fromUser;
@synthesize fromServer;
@synthesize queryParams;

- (id) initWithFromUser:(BOOL)isFromUser fromServer:(BOOL)isFromServer queryParams:(FQueryParams *)params tagged:(BOOL)tagged {
    self = [super init];
    if (self) {
        self.fromUser = isFromUser;
        self.fromServer = isFromServer;
        self.queryParams = params;
        self.isTagged = tagged;
    }
    return self;
}

+ (FOperationSource *) userInstance {
    static FOperationSource *user = nil;
    static dispatch_once_t userToken;
    dispatch_once(&userToken, ^{
        user = [[FOperationSource alloc] initWithFromUser:YES fromServer:NO queryParams:nil tagged:NO];
    });
    return user;
}

+ (FOperationSource *) serverInstance {
    static FOperationSource *server = nil;
    static dispatch_once_t serverToken;
    dispatch_once(&serverToken, ^{
        server = [[FOperationSource alloc] initWithFromUser:NO fromServer:YES queryParams:nil tagged:NO];
    });
    return server;
}

+ (FOperationSource *) forServerTaggedQuery:(FQueryParams *)params {
    return [[FOperationSource alloc] initWithFromUser:NO fromServer:YES queryParams:params tagged:YES];
}

- (NSString *) description {
    return [NSString stringWithFormat:@"FOperationSource { fromUser=%d, fromServer=%d, queryId=%@, tagged=%d }",
                    self.fromUser, self.fromServer, self.queryParams, self.isTagged];
}


@end
