dbjs-migrate.js

'use strict';

var Database, defineUser, migrateObject, migrateProperty, migrateType, memoize, getPrototypeOf
  , DbjsEvent, isGetter;

migrateType = function (type, targetDatabase) {
	var prototype, sourceEvent, targetEvent;
	if (targetDatabase.objects.getById(type.__id__)) return;
	prototype = getPrototypeOf(type);
	migrateType(prototype, targetDatabase);
	sourceEvent = type._lastOwnEvent_;
	targetEvent = new DbjsEvent(targetDatabase.objects.unserialize(type.__id__, prototype),
		prototype, (sourceEvent && sourceEvent.stamp) || 0);
	migrateObject(type, targetEvent.object);
};

migrateProperty = function (sourceDesc, targetDatabase) {
	var hasInformation = false, value, sourceEvent;
	if (targetDatabase.objects.getById(sourceDesc.__id__)) return hasInformation;
	if (migrateProperty(getPrototypeOf(sourceDesc))) hasInformation = true;
	sourceDesc._forEachOwnDescriptors_(function (subDesc) {
		var key = subDesc.key, sourceEvent;
		if (key === 'statsBase') return;
		if (key === 'type') migrateType(sourceDesc.type, targetDatabase);
		sourceEvent = subDesc._lastOwnEvent_;
		new DbjsEvent(targetDatabase.objects.unserialize(subDesc.__id__), sourceDesc[key],
			(sourceEvent && sourceEvent.stamp) || 0); //jslint: ignore
		hasInformation = true;
	});
	if (!sourceDesc.hasOwnProperty('_value_')) return hasInformation;
	value = sourceDesc._value_;
	if (sourceDesc.master instanceof sourceDesc.database.Object) {
		if (isGetter(value)) {
			if (!sourceDesc.hasOwnProperty('statsBase')) return hasInformation;
			value = sourceDesc.statsBase;
			if (value == null) return hasInformation;
		}
	}
	sourceEvent = sourceDesc._lastOwnEvent_;
	new DbjsEvent(targetDatabase.objects.unserialize(sourceDesc.__valueId__), value,
		(sourceEvent && sourceEvent.stamp) || 0); //jslint: ignore
	return true;
};

migrateObject = function (source, targetDatabase) {
	var isFullCopy = !(source.master instanceof source.database.Object), desc, anyDefined;

	for (desc in source.__descriptors__) {
		if (desc.nested) {
			if (migrateObject(source.get(desc.key), targetDatabase)) anyDefined = true;
			continue;
		}
		if (desc.object !== source) continue;
		if (!isFullCopy && !desc.hasOwnProperty('statsBase')) continue;
		if (migrateProperty(desc, targetDatabase)) anyDefined = true;
	}
	return anyDefined;
};

module.exports = function (mainDb) {
	var statsDb = new Database();
	defineUser(statsDb);

	migrateObject(mainDb.User.prototype, statsDb);
	return statsDb;
};