AbtractError

abstract error class with error code supports to create error class quickly.

AbstractError Classes

AbstractError

All Errors are derived from the AbstractError.

• Members:
  • message: the error message.
  • code: the error code.
• Methods: return true if the error instance is this error type.
  • ok()
  • notFound()
  • ....
  • invalidFormat()
• Class Methods:
  • AbstractError.isOk(err)
  • AbstractError.isNotFound(err)
  • ...

the error codes:

• AbstractError.Ok = 0
• AbstractError.NotFound = 1
• AbstractError.Corruption = 2
• AbstractError.NotSupported = 3
• AbstractError.InvalidArgument = 4
• AbstractError.IO = 5
• AbstractError.NotOpened = 6
• AbstractError.InvalidType = 7
• AbstractError.InvalidFormat = 8

Other Error Classes

• Errors.NotFoundError
• Errors.CorruptionError
• Errors.NotSupportedError/NotImplementedError
• Errors.InvalidArgumentError
• Errors.IOError
• Errors.NotOpenedError
• Errors.InvalidTypeError
• Errors.InvalidFormatError

Extends the AbstractError

use the createError function can extend the AbstractError.

createError(typeName, errorCode[, parentErrorClass])

arguments

• typeName (string): the error type name, the first character must be upper case.
• errorCode: (number): the error code, it should be greater than 1000.
• parentErrorClass: (class): the optional parent error class. defaults to AbstractError.

return

• the error class

Usage

import {AbstractError, Errors, createError} from 'abstract-error';

const NotFoundError = Errors.NotFoundError
const AlreadyReadError = createError('AlreadyRead', 10000)

const err = new AlreadyReadError('already read over error.')

assert.ok(AbstractError.isAlreadyRead(err))
assert.ok(AlreadyReadError.isAlreadyRead(err))
assert.ok(err.alreadyRead())
assert.equal(err.message, 'already read over error.')
assert.equal(err.code, 10000)