RealmConfigurationStore.kt

class RealmConfigStore {
    companion object {
        private var configMap: MutableMap<Class<out RealmObject>, RealmConfiguration> = HashMap()

        fun <T : RealmObject> init(modelClass: Class<T>, realmCfg: RealmConfiguration) {
            if (!configMap.containsKey(modelClass)) {
                configMap.put(modelClass, realmCfg)
            }
        }

        fun <T : RealmObject> fetchConfiguration(modelClass: Class<T>): RealmConfiguration? {
            return configMap[modelClass]
        }
    }
}

fun <T : RealmObject> T.getRealm() : Realm {
    return RealmConfigStore.fetchConfiguration(this::class.java)?.realm() ?: Realm.getDefaultInstance()
}

fun <T : RealmObject> getRealm(clazz : Class<T>) : Realm {
    return RealmConfigStore.fetchConfiguration(clazz)?.realm() ?: Realm.getDefaultInstance()
}

inline fun <reified D : RealmObject, T : Collection<D>> T.getRealm() : Realm {
    return RealmConfigStore.fetchConfiguration(D::class.java)?.realm() ?: Realm.getDefaultInstance()
}

inline fun <reified D : RealmObject> Array<D>.getRealm() : Realm {
    return RealmConfigStore.fetchConfiguration(D::class.java)?.realm() ?: Realm.getDefaultInstance()
}

fun RealmConfiguration.realm(): Realm {
    return Realm.getInstance(this)
}