single-file-subject.js
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single-file-subject.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Subject = locreq("lib/subject/subject.js");
	const Errors = locreq("lib/response/error.js");

	const FileHash = function(app, file_id) {
	this.name = "FileHash";
	this.file_id = file_id;

	const SingleFileSubject = function(file_id, file_name) {
	this.name = "SingleFile";
	this.file_id = file_id;
	this.file_name = file_name;

	SingleFileSubject.prototype.perform_action = function(
	context,
	action_name,
	args
	) {
	switch (action_name) {
	case "show":
	return app.FileManager.find(context, {
	id: this.file_id,
	}).then(function(results) {
	return results[0];
	});
	default:
	throw new Errors.DeveloperError(
	`Unknown action for '${
	this.collection.name
	}' subject: '${action_name}'`
	);
	}
	};
	};

	SingleFileSubject.prototype = Object.create(Subject.prototype);

	this.get_child_subject = function(file_name) {
	return new SingleFileSubject(this.file_id, file_name);
	};
	};

	FileHash.prototype = Object.create(Subject.prototype);

	module.exports = FileHash;