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  • package root

    Documentation for the Axiell Utilities Project

    Documentation for the Axiell Utilities Project

    Overview

    The Axiell Utilities Project attempts to provide a small library of classes and object applicable to most Axiell developments. The library is not geared towards any one project and so should be useful for new projects as well as existing ones.

    The library is based on a few simple principles, namely:

    • referential transparency. The principle that defines a call to a method with the same arguments will always return the same result and that the method does not have any side effects (e.g. updating global variables, etc).
    • functional programming support. If a method or class does have side effects then the method or class is marked as effectful. The library has been designed to not contain any effectful code.
    • minimal functionality. The library is designed to be small with support for a small number of common utilities. The main reason for the small size is to limit the number of dependencies drawn in by the package.

    Package structure

    The com.axiell.util package consists of a number of utilities, where each utility provides a single piece of functionality.

    Notable utilities are:

    • Configure generic configuration reader allowing application settings defined as resources to be interrogated.
    • Error generic error handling class defining a locale independent error message along with details relating to the context of the error. The context may include an exception and other relevant values.
    • Formatter retrieves and formats a locale specific string from a specified resource bundle. The formatting is specified in a C printf style.
    • Implicits implements implicit methods and classes used to pimp methods onto existing classes (e.g. fold() method to Boolean class) and to provide implicit implementations for the JsonLocal and ShowLocal type classes.
    • JsonLocal type class used to output locale specific JSON structures. Implementations exist for Message and Error.
    • Message provides a locale independent mechanism for handling strings. The strings for a given locale are stored in resource bundles that are accessed when the message is to be displayed.
    • ShowLocal type class used to show locale specific strings. Allows Message and Error to be converted to a given language string.

    Dependencies

    The list of dependencies are:

    • Typesafe Config a generic configuration file reader. The library is used by the Configure class to access settings stored as resources within an application.
    Definition Classes
    root
  • package com
    Definition Classes
    root
  • package axiell
    Definition Classes
    com
  • package util

    Axiell Utilities Project

    Axiell Utilities Project

    A set of classes and traits that provide a simple mechanism for the internationalisation of strings and error handling. A mechanism is also supplied to read an application's configuration resource. All methods have been designed to be referentially transparent without the introduction of an effectful library (e.g. cats).

    Imports

    The utility classes/traits can be imported in the usual way, however it is necessary to include the Implicits object if the showLocal and jsonLocal type class methods are used, similarly for the read method on Configure.

    Example:

    import com.axiell.util.Implicits._

    A shorthand way to gain access to all utility classes is to import:

    import com.axiell.util._
import com.axiell.util.Implicits._

    For more detail on project see the root package page.

    Definition Classes
    axiell
  • package instances

    Contains implicit values used by type classes.

    Contains implicit values used by type classes.

    The implicit values are used by the ShowLocal, JsonLocal and ConfigureReader type classes to print out language dependent strings, language dependent JSON strings and read configuration values respectively.

    Implicit values exist for the following classes:

    • ConfigureReader (read)
    • Error (showLocal, jsonLocal)
    • Int (showLocal, jsonLocal)
    • List (showLocal, jsonLocal)
    • Message (showLocal, jsonLocal)
    • java.time.OffsetDateTime (showLocal, jsonLocal)
    • java.lang.String (showLocal, jsonLocal)
    • java.lang.Throwable (showLocal, jsonLocal)

    The method names appended in brackets are the extension methods added by the implicit values.

    Definition Classes
    util
  • package syntax

    Contains implicit classes used to add extension methods.

    Contains implicit classes used to add extension methods.

    The implicit classes are used to add the following extension methods:

    • showLocal displays a language dependent version of an object
    • jsonLocal generates a JSON string with language dependent strings
    • masonLocal generates a Mason Draft 2 compliant JSON string for Error
    • fold functionality for Boolean type

    All traits found in the package are for the implementation of extension methods. The traits are mixed into the Implicits object so they can be easily imported into clients when required.

    Definition Classes
    util
  • Configure
  • ConfigureReader
  • Error
  • ErrorException
  • Formatter
  • Implicits
  • JsonLocal
  • Message
  • MessageBundle
  • ShowLocal

object Error extends Serializable

Constructs Error objects

An error may be created using either an explicit or implicit MessageBundle. The bundle defines the resource (class) containing the language specific error strings.

Example:

implicit bundle MessageBundle("Errors")
val err1 = Error("ErrorCode")
val err2 = Error(MessageBundle("Errors"), "ErrorCode")

The MessageBundle is generally defined implicitly in package.scala making it available to all code within the enclosed package. Error strings may be placed in a separate resource bundle from general messages.

When and error is created the message label is set to the error message (Message) and code is set to the error code (java.lang.String).

Source
Error.scala
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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def apply(message: Message): Error

    Create an Error from an existing Message

    Create an Error from an existing Message

    A new Error is created using the supplied Message as the message property and the Message.code as the code property.

    message

    to be used as error message

    returns

    language independent Error object

  5. def apply(bundle: MessageBundle, code: String, args: Any*): Error

    Create an Error using an explicit MessageBundle.

    Create an Error using an explicit MessageBundle.

    Example:

    val error = Error(MessageBundle("Errors"), "ErrorCode")

    The Error created extracts the error message from the supplied resource bundle. The resources associated with the bundle are generally found in the packages "resources" sub-directory.

    bundle

    from which to extract the code error message

    code

    identifying the error message to use

    args

    interpolated into the error message when displayed

    returns

    language independent Error object

  6. def apply(code: String, args: Any*)(implicit bundle: MessageBundle): Error

    Creates an Error using an implicit MessageBundle.

    Creates an Error using an implicit MessageBundle.

    Example:

    implicit bundle MessageBundle("Errors")
val error = Error("ErrorCode")

    The returned Error contains the error description in a language independent way. The implicit MessageBundle is normally defined in a package.scala file and used by all code in the package. The resources associated with the bundle are generally found in the packages "resources" sub-directory.

    code

    identifying the error message to be used

    args

    interpolated into the message when displayed

    bundle

    from which to extract the code error message (implicit)

    returns

    language independent Error object

  7. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: AnyRef): Boolean
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  11. def finalize(): Unit
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    protected[lang]
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    @throws(classOf[java.lang.Throwable])
  12. final def getClass(): Class[_ <: AnyRef]
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    @native()
  13. def hashCode(): Int
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    @native()
  14. final def isInstanceOf[T0]: Boolean
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  15. final def ne(arg0: AnyRef): Boolean
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  16. final def notify(): Unit
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  18. final def synchronized[T0](arg0: => T0): T0
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  19. def toString(): String
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  20. final def wait(): Unit
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    @throws(classOf[java.lang.InterruptedException])
  21. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException])
  22. final def wait(arg0: Long): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException]) @native()

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