fable::schema::Interface Class Reference

#include <interface.hpp>

Inheritance diagram for fable::schema::Interface:

Public Member Functions
virtual std::unique_ptr< Interface >	clone () const =0
virtual bool	is_variant () const
virtual JsonType	type () const =0
virtual std::string	type_string () const =0
virtual bool	is_required () const =0
virtual const std::string &	description () const =0
virtual void	set_description (std::string s)=0
virtual Json	usage () const =0
virtual Json	json_schema () const =0
virtual bool	validate (const Conf &c, std::optional< SchemaError > &error) const =0
virtual void	validate_or_throw (const Conf &c) const final
virtual std::optional< SchemaError >	fail (const Conf &c) const final
virtual bool	is_valid (const Conf &c) const final
virtual Json	to_json () const
virtual void	to_json (Json &) const =0
virtual void	from_conf (const Conf &)=0
virtual void	reset_ptr ()=0

Protected Member Functions
	Interface (const Interface &)=default
	Interface (Interface &&) noexcept=default
Interface &	operator= (const Interface &)=default
Interface &	operator= (Interface &&) noexcept=default

Detailed Description

Interface specifies all information for describing a JSON entity.

Schemas are instantiated through one of the many constructors that are defined.

Notes

Most constructor definitions make use of one of a set of private template constructors. These private template constructors enable slimmer constructors for all sorts of types later on. In order to differentiate between these constructors and the ones that users should use, the number of parameters and the order of types is sometimes varied.

We could use named constructors, but then you can not use the new operator with the construction or you need to use the copy constructor thereby constructing the schema twice.

Changes

When changing this Interface, the following implementors should be updated:

Box fable/schema/interface.hpp Schema fable/schema.hpp Variant fable/schema/variant.hpp FromConfable fable/schema/confable.hpp

Member Function Documentation

clone()

virtual std::unique_ptr<Interface> fable::schema::Interface::clone ( ) const

pure virtual

Return a new instance of the object.

This is implemented by Base and allows us to wrap implementors of Interface with Schema.

Implemented in fable::schema::Variant, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

description()

virtual const std::string& fable::schema::Interface::description ( ) const

pure virtual

Return human-readable description.

Implemented in fable::schema::Variant, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

fail()

virtual std::optional<SchemaError> fable::schema::Interface::fail ( const Conf &  c ) const

inlinefinalvirtual

Return input JSON configuration schema error, if any.

If you don't have a Conf but would like to validate a Json type, then construct a Conf on the fly:

s.fail(Conf{j});

This overload is not provided inline to prevent incorrect use.

Parameters

c	JSON to check

Returns

error if invalid

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

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from_conf()

virtual void fable::schema::Interface::from_conf ( const Conf &  )

pure virtual

Apply the input JSON configuration.

This does not validate the input.

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Struct, fable::schema::String, fable::schema::Path< T >, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Number< T >, fable::schema::Map< T, P >, fable::schema::FromJson< T >, fable::schema::Box, fable::schema::Factory< T >, fable::schema::Factory< DistributionPtr >, fable::schema::Enum< T >, fable::schema::Duration< T, Period >, fable::schema::CustomDeserializer, fable::schema::Const< T, P >, fable::schema::FromConfable< T, >, fable::schema::Boolean, fable::schema::Array< T, N, P >, fable::Schema, fable::schema::Ignore, fable::schema::FactoryBase< T, CRTP >, fable::schema::FactoryBase< T, Factory< T > >, and fable::schema::FactoryBase< T, FactoryPointerless< T > >.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

is_required()

virtual bool fable::schema::Interface::is_required ( ) const

pure virtual

Return whether this interface needs to be set.

Implemented in fable::schema::Variant, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

is_valid()

virtual bool fable::schema::Interface::is_valid ( const Conf &  c ) const

inlinefinalvirtual

Return whether the input JSON is valid.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

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is_variant()

virtual bool fable::schema::Interface::is_variant ( ) const

inlinevirtual

Return whether the accepted input type is a variant.

A variant type is one that is composed of other types, such as the special types: any-of, one-of, and all-of.

Reimplemented in fable::schema::Variant, and fable::schema::Optional< T, P >.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

json_schema()

virtual Json fable::schema::Interface::json_schema ( ) const

pure virtual

Return the JSON schema.

Example output:

{ "$schema": "http://json-schema.org/draft-07/schema#", "description": "stand-in no-operation simulator", "properties": { "vehicles": { "description": "list of vehicle names to make available", "items": { "type": "string" }, "type": "array" } }, "title": "nop", "additionalProperties": false, "type": "object" }

See the following links for the specification:

• https://json-schema.org
• https://json-schema.org/understanding-json-schema/

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Struct, fable::schema::String, fable::schema::Path< T >, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Number< T >, fable::schema::Map< T, P >, fable::schema::FromJson< T >, fable::schema::Box, fable::schema::Ignore, fable::schema::FactoryBase< T, CRTP >, fable::schema::FactoryBase< T, Factory< T > >, fable::schema::FactoryBase< T, FactoryPointerless< T > >, fable::schema::Enum< T >, fable::schema::Duration< T, Period >, fable::schema::CustomDeserializer, fable::schema::Const< T, P >, fable::schema::FromConfable< T, >, fable::schema::Boolean, fable::schema::Array< T, N, P >, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

reset_ptr()

virtual void fable::schema::Interface::reset_ptr ( )

pure virtual

Reset the internal pointer to nullptr, protecting against invalid access.

This should be used when a schema is used after the backing data has been deleted.

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Struct, fable::schema::String, fable::schema::Path< T >, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Number< T >, fable::schema::Map< T, P >, fable::schema::FromJson< T >, fable::schema::Box, fable::schema::Ignore, fable::schema::Factory< T >, fable::schema::Factory< DistributionPtr >, fable::schema::FactoryBase< T, CRTP >, fable::schema::FactoryBase< T, Factory< T > >, fable::schema::FactoryBase< T, FactoryPointerless< T > >, fable::schema::Enum< T >, fable::schema::Duration< T, Period >, fable::schema::CustomDeserializer, fable::schema::Const< T, P >, fable::schema::FromConfable< T, >, fable::schema::Boolean, fable::schema::Array< T, N, P >, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

set_description()

virtual void fable::schema::Interface::set_description ( std::string  s )

pure virtual

Set human-readable description.

Implemented in fable::schema::Variant, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

to_json() [1/2]

virtual Json fable::schema::Interface::to_json ( ) const

inlinevirtual

Return the current value of the destination.

Warning: This is NOT an efficient operation, but it can be useful for cases where speed is not important.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema.hpp, /home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp, and /home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/struct.hpp.

to_json() [2/2]

virtual void fable::schema::Interface::to_json ( Json &  ) const

pure virtual

Return the current value of the destination.

Warning: This is NOT an efficient operation, but it can be useful for cases where speed is not important.

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Struct, fable::schema::String, fable::schema::Path< T >, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Number< T >, fable::schema::Map< T, P >, fable::schema::FromJson< T >, fable::schema::Box, fable::schema::Ignore, fable::schema::Factory< T >, fable::schema::Factory< DistributionPtr >, fable::schema::Enum< T >, fable::schema::Duration< T, Period >, fable::schema::CustomDeserializer, fable::schema::Const< T, P >, fable::schema::FromConfable< T, >, fable::schema::Boolean, fable::schema::Array< T, N, P >, fable::Schema, fable::schema::FactoryBase< T, CRTP >, fable::schema::FactoryBase< T, Factory< T > >, and fable::schema::FactoryBase< T, FactoryPointerless< T > >.

type()

virtual JsonType fable::schema::Interface::type ( ) const

pure virtual

Return the JSON type.

If this is a variant type of differing types, then null should be returned. Otherwise, the type remains unique and can be returned. A type that is null is almost always a variant type of some sort, if even only an optional type.

Implemented in fable::schema::Variant, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

type_string()

virtual std::string fable::schema::Interface::type_string ( ) const

pure virtual

Return the type as a string.

The format of the string is:

"[array of] TYPE"

where TYPE is one of: null, object, boolean, float, integer, unsigned, string, and unknown.

Example output:

"object"
"array of boolean"
"array of object"

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, fable::schema::Array< T, N, P >, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

usage()

virtual Json fable::schema::Interface::usage ( ) const

pure virtual

Return a compact JSON description of the schema. This is useful for human-readable error output.

Example output:

{ "field1": "boolean! :: lorem ipsum dolor sit amet", "field2": { "field2.1": "integer :: lorem ipsum dolor sit amet" "field2.2": "boolean :: lorem ipsum dolor sit amet" }, "field3": "array of integer :: lorem ipsum dolor sit amet", "field4": [{ "field4.1": "string :: lorem ipsum dolor sit amet" "field4.2": "boolean :: lorem ipsum dolor sit amet" }] }

When describing the schema of a primitive array, we can represent that as a single string. But when the array contains an object, we wrap a single object in an array. This isn't awfully consistent, but it's the best we can do.

Implemented in fable::schema::Variant, fable::schema::Struct, fable::schema::Base< CRTP >, fable::schema::Base< Array< T, N, P > >, fable::schema::Base< Path< T > >, fable::schema::Base< Factory< T > >, fable::schema::Base< FromConfable< T > >, fable::schema::Base< Vector< T, P > >, fable::schema::Base< String >, fable::schema::Base< FactoryPointerless< T > >, fable::schema::Base< Boolean >, fable::schema::Base< Optional< T, P > >, fable::schema::Base< FromJson< T > >, fable::schema::Base< Const< T, P > >, fable::schema::Base< Number< T > >, fable::schema::Base< Map< T, P > >, fable::schema::Base< Enum< T > >, fable::schema::Base< Duration< T, Period > >, fable::schema::Base< Ignore >, fable::schema::Base< Struct >, fable::schema::Base< Passthru< P > >, fable::schema::Box, fable::schema::CustomDeserializer, and fable::Schema.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

validate()

virtual bool fable::schema::Interface::validate ( const Conf &  c, std::optional< SchemaError > &  error  ) const

pure virtual

Validate the input JSON configuration for correctness.

• This method should only set error if there is an error. This method should not reset error if there is no error. Therefore, the content of error is only valid if the method returns false. This allows you to chain validates and check at the end if there was an error.
• This method should not throw if there is a schema error!

Parameters

c	JSON to check
error	reference to store error if occurred

Returns

true if valid

Implemented in fable::schema::Vector< T, P >, fable::schema::Variant, fable::schema::Struct, fable::schema::String, fable::schema::Path< T >, fable::schema::Passthru< P >, fable::schema::Optional< T, P >, fable::schema::Number< T >, fable::schema::Map< T, P >, fable::schema::FromJson< T >, fable::schema::Box, fable::schema::FactoryBase< T, CRTP >, fable::schema::FactoryBase< T, Factory< T > >, fable::schema::FactoryBase< T, FactoryPointerless< T > >, fable::schema::Enum< T >, fable::schema::Duration< T, Period >, fable::schema::CustomDeserializer, fable::schema::Const< T, P >, fable::schema::FromConfable< T, >, fable::schema::Boolean, fable::schema::Array< T, N, P >, fable::Schema, and fable::schema::Ignore.

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

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validate_or_throw()

virtual void fable::schema::Interface::validate_or_throw ( const Conf &  c ) const

inlinefinalvirtual

Validate the input JSON configuration or throw an error.

If you don't have a Conf but would like to validate a Json type, then construct a Conf on the fly:

s.validate_or_throw(Conf{j});

This overload is not provided inline to prevent incorrect use.

Parameters

c	JSON to check

Examples

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp.

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---

The documentation for this class was generated from the following file:

• /home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/fable/include/fable/schema/interface.hpp