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    Documentation for the Axiell Schema Project

    Documentation for the Axiell Schema Project

    Overview

    The Axiell Schema Project provides a small library for validating JSON documents against a JSON Schema. The library conforms to the JSON Schema Draft #7 specification.

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

    • referential transparency. Each of the methods in the library is referentially transparent, that is if the method is called with the same arguments it will always return the same value and the method does not have any side effect (e.g. update globals, change the operating environment, etc).
    • minimal functionality. The library is designed to be small incorporating a small number of dependencies. The number of methods associated with a class/object is restricted to those that provide a base level of functionality.
    • support multiple JSON libraries. It should be possible to use the library with any number of different JSON library packages (e.g json4s, jackson, etc). The current library only supports json4s, but a facade approach should be added to hide individual library implementations.
    • generic "format" implementations. The JSON Schema specification mandates a standard set of "format" types that can be used to validate string values. Each "format" type is implemented as a class with the components of the type available.
    • full error handling. Error resulting from the validation process are returned as a list of validation failures. All possible errors should be returned for a single call, eliminating the need to fix a single error and then recall a method.

    Package structure

    The com.axiell.schema packages consists of a number of utilities, where each utility provides a single piece of functionality. Since the library validates JSON structures two main components are provided. The first component (com.axiell.schema.Schema) allows JSON documents conforming to the JSON Schema specification to be read. Once read a resolution process may be required to resolve any external references defined in the document.

    The second component (com.axiell.schema.SchemaValidator) takes a resolved schema and allows JSON documents to be validated against that schema. When creating a validator it is also possible to incorporate your own "format" types for validation.

    A set of auxiliary components implement parsers for many of the "format" types and can be used independently of the validator itself.

    Notable utilities are:

    • Schema wrapper around a JSON document containing the document itself, its $id value and resolution mappings for all $id and $ref directives.
    • SchemaValidator takes a Schema and an optional handler for "format" types and provides a validation method for arbitrary JSON documents.
    • Implicits implements implicit methods and classes used to convert one class to another or pimp methods onto existing classes (e.g. same() method to JValue class).
    • various auxiliary classes for handling "format" types including:

    Dependencies

    The list of dependencies are:

    • Axiell Util Library provides error handling classes and methods that allow multilingual error messages to be generated.
    • JSON for Scala Library provides mthods for dealing with JSON structures. The routines work around an AST (Abstract Syntax Tree) used to represent a JSON document.
    • Cats Functional Programming Library provides various traits, classes and methods that simplify functional programming in Scala. Also provides the Validated class used to return lists of validation errors.
    Definition Classes
    root
  • package com
    Definition Classes
    root
  • package axiell
    Definition Classes
    com
  • package schema

    Contains types used by the library.

    Contains types used by the library.

    In order to simplify method signatures a series of types are defined. The types are used throughout the library.

    Definition Classes
    axiell
  • package instances
    Definition Classes
    schema
  • package syntax
    Definition Classes
    schema
  • Assertions
  • Context
  • EmailAddress
  • Formats
  • Hostname
  • Implicits
  • Ipv4Address
  • Ipv6Address
  • JsonPointer
  • RelativeJsonPointer
  • Resolver
  • Schema
  • SchemaValidator
  • SchemaWalker
  • Validator
o

com.axiell.schema

Implicits

object Implicits extends JsonPointerInstances with JValueInstances with NonEmptyListInstances with ErrorSyntax with JValueSyntax

Groups all implicits into a single object

Method extension implicits (Syntax suffix) and implicit variables (Instances Suffix) are mixed into a single object allowing a single import statement to be used to bring them all into scope.

The required import statement is:

import com.axiell.schema.Implicits._
Source
Implicits.scala
Linear Supertypes
JValueSyntax, ErrorSyntax, NonEmptyListInstances, JValueInstances, JsonPointerInstances, AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. Implicits
  2. JValueSyntax
  3. ErrorSyntax
  4. NonEmptyListInstances
  5. JValueInstances
  6. JsonPointerInstances
  7. AnyRef
  8. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Type Members

  1. implicit class ErrorSyntaxOps extends AnyRef

    Adds extension methods to Error via implicit class

    Adds extension methods to Error via implicit class

    Definition Classes
    ErrorSyntax
  2. implicit class JValueSyntaxOps extends AnyRef

    Adds extension methods to JValue via implicit class

    Adds extension methods to JValue via implicit class

    Definition Classes
    JValueSyntax

Value Members

  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. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  8. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  9. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  10. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  12. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  14. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  15. implicit val schemaJsonLocalForJValue: JsonLocal[JValue]

    Implements JsonLocal[JValue] enabling the jsonLocal extension method for JValue.

    Implements JsonLocal[JValue] enabling the jsonLocal extension method for JValue. The json extension method simply returns the JValue as a compact JSON string.

    Definition Classes
    JValueInstances
  16. implicit val schemaJsonLocalForJsonPointer: JsonLocal[JsonPointer]

    Implements JsonLocal[JsonPointer] enabling the jsonLocal extension method for JsonPointer.

    Implements JsonLocal[JsonPointer] enabling the jsonLocal extension method for JsonPointer.

    The format of the JSON string generated is the escaped version of the JSON Pointer as a string.

    Definition Classes
    JsonPointerInstances
  17. implicit def schemaJsonLocalForNonEmptyList[A](implicit arg0: JsonLocal[A]): JsonLocal[NonEmptyList[A]]

    Implements JsonLocal[NonEmptyList[_]] enabling the jsonLocal method extension for NonEmptyList.

    Implements JsonLocal[NonEmptyList[_]] enabling the jsonLocal method extension for NonEmptyList.

    The format of the JSON string generated is a JSON array with each entry output as a JSON element.

    A

    type of objects in list

    returns

    JSON array containing each element in JSON format

    Definition Classes
    NonEmptyListInstances
  18. implicit val schemaShowLocalForJsonPointer: ShowLocal[JsonPointer]

    Implements ShowLocal[JsonPointer] enabling the showLocal extension method for JsonPointer.

    Implements ShowLocal[JsonPointer] enabling the showLocal extension method for JsonPointer.

    The showLocal extension method prints out the JSON Pointer as a string.

    Definition Classes
    JsonPointerInstances
  19. implicit def schemaShowLocalForNonEmptyList[A](implicit arg0: ShowLocal[A]): ShowLocal[NonEmptyList[A]]

    Implements ShowLocal[NonEmptyList[_]] enabling the showLocal method extension for NonEmptyList.

    Implements ShowLocal[NonEmptyList[_]] enabling the showLocal method extension for NonEmptyList.

    The showLocal extension method prints out a comma separated list of the entires enclosed within round brackets.

    A

    type of objects in list

    returns

    textual representation of list with comma separated elements

    Definition Classes
    NonEmptyListInstances
  20. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  21. def toString(): String
    Definition Classes
    AnyRef → Any
  22. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from JValueSyntax

Inherited from ErrorSyntax

Inherited from NonEmptyListInstances

Inherited from JValueInstances

Inherited from JsonPointerInstances

Inherited from AnyRef

Inherited from Any

Ungrouped