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resource-type-field.js
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resource-type-field.js
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var Sealious = require("../main.js");
var Promise = require("bluebird");
/**
* !! resource_type is optional, needen only for nice errors
*
*/
function ResourceTypeField (declaration, resource_type) {
this.name = declaration.name;
this.type_name = declaration.type;
this.human_readable_name = declaration.human_readable_name || null;
if (!Sealious.ChipManager.chip_exists("field_type", this.type_name)) {
throw new Sealious.Errors.DeveloperError("In declaration of resource type '" + resource_type.name +"': unknown field type '"+this.type_name+"' in field '"+this.name+"'.");
}
this.params = declaration.params;
this.default_value = declaration.default_value;
this.type = Sealious.ChipManager.get_chip("field_type", declaration.type);
this.type.init && this.type.init();
this.required = declaration.required || false;
this.derived = declaration.derived || false;
};
ResourceTypeField.prototype = new function(){
/**
* Shorthand for ResourceTypeField.type.isProperValue
* @alias ResourceTypeField#isProperValue
* @param {object} value
* @return {Promise}
*/
this.check_value = function(context, value, old_value){
return this.type.is_proper_value(context, this.params, value, old_value);
}
/**
* Creates map object.name = value
* @param {String} name
* @param {String} value
* @return {Promise} resolving with object, where object.name = value
*/
function to_map (name, value) {
var obj = {};
obj[name] = value;
return Promise.resolve(obj);
}
/**
* Checks if field has previous value sensitive methods
* @params method_name:String - which field-type method to check
* @return {Boolean}
*/
this.is_old_value_sensitive = function(method_name){
return this.type.is_old_value_sensitive(method_name);
}
/**
* It's a wrapper, which checks if encode_value function uses context or previous value, and if it does adds it to arguments.
* @return {} encoded value
*/
this.encode_value = function(context, new_value, old_value){
return this.type.encode(context, this.params, new_value, old_value);
}
/**
* It's a wrapper, which checks if decode_value function uses context, and if it does adds it to arguments.
* @returns {} decoded value
*/
this.decode_value = function(context, value_in_database){
return this.type.decode(context, this.params, value_in_database);
}
/**
* Gets field signature: name, type, required, human redable name, params, validator function, default value
* @param {Boolean} with validator - - whether to include validator function in field description.
* Warning! If set to true, the output is not serializable in JSON.
* @returns {} field signature
*/
this.get_specification = function(with_validator){
//with_validator:boolean - whether to include validator function in field description. Warning! If set to true, the output is not serializable in JSON.
var field_specification = {};
field_specification.name = this.name;
field_specification.type = this.type_name;
field_specification.required = this.required;
field_specification.human_readable_name = (typeof this.human_readable_name == "string") ? this.human_readable_name : undefined;
field_specification.params = this.params;
field_specification.validate = this.check_value.bind(this);
field_specification.default_value = this.default_value;
return field_specification;
}
this.get_nice_name = function(){
return this.human_readable_name || this.name;
}
}
ResourceTypeField.test_start = function(){
describe("ResourceTypeField", function(){
describe("constructor", function(){
it("should throw a nice error when non-existent field type is provided in declaration", function(done){
try {
var test_field = new ResourceTypeField({
name: "test_field",
type: "truly_non_existent_field_type",
}, {
name: "fake_resource_type"
});
} catch (error) {
if (error.is_developer_fault == true) {
done();
} else {
done(new Error("But it threw a non-nice error."));
}
return;
}
done(new Error("But it didn't throw any error at all"));
});
})
})
}
module.exports = ResourceTypeField;

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