confinode/lib/ConfigDescription/DefaultValueDescription/DefaultValueDescription.js

Node application configuration reader

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ConfinodeError_1 = require("../../ConfinodeError");
const ConfinodeResult_1 = require("../../ConfinodeResult");
const ConfigDescription_1 = require("../ConfigDescription");
/**
 * Description of a default value.
 */
class DefaultValueDescription {
    /**
     * Create a default value description.
     *
     * @param description - The description to “protect” by a default value.
     * @param defaultValue - The value to use if description does not exist.
     */
    constructor(description, defaultValue) {
        this.description = description;
        this.defaultValue = defaultValue;
    }
    parse(data, context) {
        const { keyName, parent, final } = context;
        if (data !== undefined && data !== null) {
            return ConfigDescription_1.asDescription(this.description).parse(data, context);
        }
        else if (data === undefined && parent) {
            return parent;
        }
        else if (!final) {
            return undefined;
        }
        else if (data === undefined) {
            return new ConfinodeResult_1.DirectResult(this.defaultValue);
        }
        else {
            throw new ConfinodeError_1.default('missingMandatory', keyName);
        }
    }
}
exports.default = DefaultValueDescription;
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