firebase-ios-sdk/Firestore/Source/Util/FSTUsageValidation.h

/*
 * 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 <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

/** Helper for creating a general exception for invalid usage of an API. */
NSException *FSTInvalidUsage(NSString *exceptionName, NSString *format, ...);

/**
 * Macro to throw exceptions in response to API usage errors. Avoids the lint warning you usually
 * get when using @throw and (unlike a function) doesn't trigger warnings about not all codepaths
 * returning a value.
 *
 * Exceptions should only be used for programmer errors made by consumers of the SDK, e.g.
 * invalid method arguments.
 *
 * For recoverable runtime errors, use NSError**.
 * For internal programming errors, use HARD_FAIL().
 */
#define FSTThrowInvalidUsage(exceptionName, format, ...)          \
  do {                                                            \
    @throw FSTInvalidUsage(exceptionName, format, ##__VA_ARGS__); \
  } while (0)

#define FSTThrowInvalidArgument(format, ...)                                       \
  do {                                                                             \
    @throw FSTInvalidUsage(@"FIRInvalidArgumentException", format, ##__VA_ARGS__); \
  } while (0)

NS_ASSUME_NONNULL_END