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To\n * intercept error handling,\n * write a custom exception handler that replaces this default as appropriate for your app.\n *\n * ### Example\n *\n * ```javascript\n *\n * class MyExceptionHandler implements ExceptionHandler {\n * call(error, stackTrace = null, reason = null) {\n * // do something with the exception\n * }\n * }\n *\n * bootstrap(MyApp, {provide: ExceptionHandler, useClass: MyExceptionHandler}])\n *\n * ```\n * @stable\n */\nexport class ExceptionHandler {\n constructor(private _logger: any, private _rethrowException: boolean = true) {}\n\n static exceptionToString(exception: any, stackTrace: any = null, reason: string = null): string {\n var l = new _ArrayLogger();\n var e = new ExceptionHandler(l, false);\n e.call(exception, stackTrace, reason);\n return l.res.join('\\n');\n }\n\n call(exception: any, stackTrace: any = null, reason: string = null): void {\n var originalException = this._findOriginalException(exception);\n var originalStack = this._findOriginalStack(exception);\n var context = this._findContext(exception);\n\n this._logger.logGroup(`EXCEPTION: ${this._extractMessage(exception)}`);\n\n if (isPresent(stackTrace) && isBlank(originalStack)) {\n this._logger.logError('STACKTRACE:');\n this._logger.logError(this._longStackTrace(stackTrace));\n }\n\n if (isPresent(reason)) {\n this._logger.logError(`REASON: ${reason}`);\n }\n\n if (isPresent(originalException)) {\n this._logger.logError(`ORIGINAL EXCEPTION: ${this._extractMessage(originalException)}`);\n }\n\n if (isPresent(originalStack)) {\n this._logger.logError('ORIGINAL STACKTRACE:');\n this._logger.logError(this._longStackTrace(originalStack));\n }\n\n if (isPresent(context)) {\n this._logger.logError('ERROR CONTEXT:');\n this._logger.logError(context);\n }\n\n this._logger.logGroupEnd();\n\n // We rethrow exceptions, so operations like 'bootstrap' will result in an error\n // when an exception happens. If we do not rethrow, bootstrap will always succeed.\n if (this._rethrowException) throw exception;\n }\n\n /** @internal */\n _extractMessage(exception: any): string {\n return exception instanceof BaseWrappedException ? exception.wrapperMessage :\n exception.toString();\n }\n\n /** @internal */\n _longStackTrace(stackTrace: any): any {\n return isListLikeIterable(stackTrace) ? (<any[]>stackTrace).join('\\n\\n-----async gap-----\\n') :\n stackTrace.toString();\n }\n\n /** @internal */\n _findContext(exception: any): any {\n try {\n if (!(exception instanceof BaseWrappedException)) return null;\n return isPresent(exception.context) ? exception.context :\n this._findContext(exception.originalException);\n } catch (e) {\n // exception.context can throw an exception. if it happens, we ignore the context.\n return null;\n }\n }\n\n /** @internal */\n _findOriginalException(exception: any): any {\n if (!(exception instanceof BaseWrappedException)) return null;\n\n var e = exception.originalException;\n while (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n e = e.originalException;\n }\n\n return e;\n }\n\n /** @internal */\n _findOriginalStack(exception: any): any {\n if (!(exception instanceof BaseWrappedException)) return null;\n\n var e = exception;\n var stack = exception.originalStack;\n while (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n e = e.originalException;\n if (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n stack = e.originalStack;\n }\n }\n\n return stack;\n }\n}\n"]} |