"use strict";
/**
* @fileOverview Enables a schema and validation feature set to your document or other object.
* @module documents/schema
* @requires base
* @requires jjv
* @require lodash
*/
var sys = require( "lodash" );
var Validator = require( "jjv" );
var Base = require( "../base" );
/**
* The validator mixin provides access to the features of the JSON validation system
* @exports documents/schema
* @mixin
*/
var Schema = Base.compose( [Base], /** @lends documents/schema# */{
constructor : function () {
/**
* The schema that defines the validation rules. This should probably be defined at the prototype for each
* object or model classification. It can be an anonymous schema defined right here, or this can be
* registered schema names to use, or just a single name
*
* @type {object}
* @memberOf documents/schema#
* @name schema
*/
/**
* If you want to register multiple schemas, use this property instead
*
* @type {object}
* @memberOf documents/schema#
* @name schemas
*/
/**
* The validation environment
* @private
* @type {jjv}
*/
var env = new Validator();
/**
* The default name of the scheman when you use anonymous schemas. You can define this at the prototype for classified
* schemas. The can also
*
* @type {string|function():{string}}
* @memberOf documents/schema#
* @name _defaultSchemaName
*/
this._defaultSchemaName = sys.result( this, "_defaultSchemaName" ) || sys.uniqueId( "schema" );
/**
* The options to pass to the validator when it runs
* @type {object|function():{object}}
* @name validationOptions
* @memberOf documents/schema#
*/
this.validationOptions = sys.defaults( {}, sys.result( this, 'validationOptions' ), {checkRequired : true} );
/**
* Validate an object against the schema
* @returns {object?}
* @method
* @name validate
* @memberOf documents/schema#
* @param {object=} record The record to validate
* @param {string|object=} schemaName The name of a previously registered schema
* @param {object=} options Options to pass to the validator
* @example
* // This supports these signatures:
*
* instance.validate(record, schemaName, options);
*
*
* instance.validate(); // this, this._defaultSchemaName, this.validationOptions
* instance.validate(record); // record, this._defaultSchemaName, this.validationOptions
* instance.validate(schemaName); //this, schemaName, this.validationOptions
* instance.validate(record, schemaName); //record, schemaName, this.validationOptions
* instance.validate(schemaName, options); //this, schemaName, this.validationOptions
*/
this.validate = function ( record, schemaName, options ) {
if ( arguments.length === 0 ) {
record = this;
schemaName = this._defaultSchemaName;
options = this.validationOptions;
} else {
if ( sys.isString( record ) ) {
schemaName = record;
record = this;
}
if ( sys.isEmpty( options ) ) {
options = this.validationOptions;
}
}
return env.validate( schemaName, record, options );
};
/**
* Initialize the schema collection by registering the with the handler. You can call this at any time and as often as you like. It will be called once
* by the constructor on any instance schemas
* @method
* @name registerSchemas
* @memberOf documents/schema#
* @param {hash} schemas A hash of schemas where the key is the name of the schema
*/
this.registerSchemas = function ( schemas ) {
var schema = sys.result( this, "schema" );
var schemas = schemas || sys.result( this, "schemas" );
if ( !sys.isEmpty( schema ) ) {
env.addSchema( this._defaultSchemaName, schema );
}
if ( !sys.isEmpty( schemas ) ) {
sys.each( schemas, function ( val, key ) {
env.addSchema( val, key );
} );
}
};
/**
* Extracts only the elements of the object that are defined in the schema
* @memberOf documents/schema#
* @name extract
* @param {object=} record The record to extract from
* @param {string=} schema The name of the schema to attach
* @method
*/
this.extract = function ( record, schema ) {
if ( arguments.length === 0 ) {
record = this;
schema = this._defaultSchemaName;
}
if ( sys.isString( record ) ) {
schema = record;
record = this;
}
};
/**
* Create a type to be used in your schemas to define new validators
* @memberOf documents/schema#
* @name addType
* @method
* @param {string} name The name of the type
* @param {function(object)} operation What to do with the type.
* @param {object} operation.value The value to validation
* @returns {boolean}
*/
this.addType = env.addType;
/**
* It is also possible to add support for additional string formats through the addFormat function.
* @memberOf documents/schema#
* @name addFormat
* @method
* @param {string} name The name of the formatter
* @param {function(object)} formatter How to format it
* @param {object} formatter.value The value to format
* @returns {boolean}
*/
this.addFormat = env.addFormat;
/**
* It is possible to add support for custom checks (i.e., minItems, maxItems, minLength, maxLength, etc.) through the addCheck function
* @memberOf documents/schema#
* @name addCheck
* @method
* @param {string} name The name of the check
* @param {function(...object)} formatter Perform the check
* @param {object} formatter.value The value to check followed by any parameters from the schema
* @returns {boolean}
*/
this.addCheck = env.addCheck;
/**
* Custom coercion rules
*
* @memberOf documents/schema#
* @name addTypeCoercion
* @method
* @param {string} name The name of the coercion
* @param {function(object)} coercer Perform the coercion
* @param {object} coercer.value The value to coerce
* @returns {boolean}
*/
this.addTypeCoercion = env.addTypeCoercion;
/**
* Get a registered schema by name
* @param {string=} schemaName
* @returns {object?}
* @memberOf documents/schema#
* @name getSchema
* @method
*/
this.getSchema = function ( schemaName ) {
if ( sys.isEmpty( schemaName ) || !sys.isString() ) {
schemaName = this._defaultSchemaName;
}
return env.schema[schemaName];
}
},
/**
* This method will create a new object that contains only the fields and no methods or other artifacts. This is useful
* for creating objects to pass over the wire or save in a table. This is not deeply copied, so changes made to the
* extracted object will be represented in this class for reference objects.
*
* @param {string=} schema The schema name to use
* @param {object=} src The object to extract fields from
* @return {object} Data-only version of the class instance.
*/
extract : function ( schemaName, src ) {
if ( sys.isObject( schemaName ) ) {
src = schema;
schemaName = this._defaultSchemaName;
}
if ( sys.isEmpty( src ) ) {
src = this;
}
if ( sys.isFunction( src.toJSON ) ) {
src = src.toJSON();
}
var schema = this.getSchema( schemaName ) || {};
var newobj = {};
sys.each( schema.properties, function ( prop, propname ) {
if ( prop.properties && !sys.isUndefined( src[ propname ] ) ) {
newobj[ propname ] = this.extract( prop, src[propname] );
} else if ( !sys.isUndefined( src[ propname ] ) ) {
newobj[ propname ] = src[ propname ];
}
}, this );
return newobj;
},
/**
* Builds a default document based on the schema. What this does is create a document from schema and for each property
* that has a default value or is required, the resultant object will contain that property. It is useful for extending
* values from some source that may be incomplete, like options or some such.
* @param {json-schema} schema A schema to use to create the default document
* @returns {object?}
* @name defaultDoc
* @memberOf documents/schema#
* @method
*/
defaultDoc : function ( schemaName ) {
if ( sys.isEmpty( schemaName ) ) {
schemaName = this._defaultSchemaName;
}
var newdoc = {};
var schema;
if ( sys.isObject( schemaName ) ) {
schema = schemaName;
} else {
schema = this.getSchema( schemaName ) || {};
}
sys.each( schema.properties, function ( val, key ) {
var def = val[ "default" ]; // keyword and all that
if ( val.type === "object" && !sys.isEmpty( val.properties ) ) {
newdoc[ key ] = this.defaultDoc( val );
} else {
if ( sys.isFunction( def ) || sys.isBoolean( def ) || sys.isNumber( def ) || !sys.isEmpty( def ) ) {
if ( sys.isFunction( def ) ) {
newdoc[ key ] = def( schema );
} else {
newdoc[ key ] = def;
}
} else if ( val.required ) {
if ( val.type === 'string' ) {
newdoc[ key ] = null;
} else if ( val.type === 'object' ) {
newdoc[ key ] = {};
} else if ( val.type === 'array' ) {
newdoc[ key ] = [];
} else {
newdoc[ key ] = null;
}
}
}
}, this );
return newdoc;
}
} );
module.exports = Schema;