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import { SceneParser } from './parsers/scene.js';

/**

* @import { AppBase } from './app-base.js'

* @import { Entity } from './entity.js'

*/

/**

* Create a Template resource from raw database data.

*

* @category Framework

*/

class Template {

/**

* @type {AppBase}

* @private

*/

_app;

/** @private */

_data;

/**

* @type {Entity|null}

* @private

*/

_templateRoot = null;

/**

* Create a new Template instance.

*

* @param {AppBase} app - The application.

* @param {object} data - Asset data from the database.

*/

constructor(app, data) {

this._app = app;

this._data = data;

}

/**

* Create an instance of this template.

*

* @returns {Entity} The root entity of the created instance.

*/

instantiate() {

if (!this._templateRoot) { // at first use, after scripts are loaded

this._parseTemplate();

}

return this._templateRoot.clone();

}

/** @private */

_parseTemplate() {

const parser = new SceneParser(this._app, true);

this._templateRoot = parser.parse(this._data);

}

set data(value) {

this._data = value;

// cache invalidation: the next instantiate() will parse and use the new _data

this._templateRoot = null;

}

get data() {

return this._data;

}

}

export { Template };