import {CacheDirector} from '../CacheDirector';
import MongoDB = require('mongodb');

/**
 * Caches documents using their _id field as the unique cache key. This
 * is useful if you primarily query your documents using their _id field,
 * however can be suboptimal (or even a complete waste) if you use different
 * types of queries.
 */
export class CacheOnID implements CacheDirector{
    valid(object: { _id: any }) {
        return !!object._id;
    }

    buildKey(object: { _id: any }) {
        if (object._id._bsontype == 'ObjectID')
            return new MongoDB.ObjectID(object._id.id).toHexString();
        return object._id;
    }

    validQuery(conditions) {
        return !!conditions._id;
    }

    buildQueryKey(conditions) {
        if (conditions._id._bsontype == 'ObjectID')
            return new MongoDB.ObjectID(conditions._id.id).toHexString();
        return conditions._id;
    }
}