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package ca.allanwang.kau.kpref
/**
* Created by Allan Wang on 2017-06-07.
*/
private object UNINITIALIZED
fun KPref.kpref(key: String, fallback: Boolean): KPrefDelegate<Boolean> = KPrefDelegate(key, fallback, this)
fun KPref.kpref(key: String, fallback: Double): KPrefDelegate<Float> = KPrefDelegate(key, fallback.toFloat(), this)
fun KPref.kpref(key: String, fallback: Float): KPrefDelegate<Float> = KPrefDelegate(key, fallback, this)
fun KPref.kpref(key: String, fallback: Int): KPrefDelegate<Int> = KPrefDelegate(key, fallback, this)
fun KPref.kpref(key: String, fallback: Long): KPrefDelegate<Long> = KPrefDelegate(key, fallback, this)
fun KPref.kpref(key: String, fallback: Set<String>): KPrefDelegate<StringSet> = KPrefDelegate(key, StringSet(fallback), this)
fun KPref.kpref(key: String, fallback: String): KPrefDelegate<String> = KPrefDelegate(key, fallback, this)
class StringSet(set: Collection<String>) : LinkedHashSet<String>(set)
class KPrefDelegate<T : Any> internal constructor(private val key: String, private val fallback: T, private val pref: KPref, lock: Any? = null) : Lazy<T>, java.io.Serializable {
@Volatile private var _value: Any = UNINITIALIZED
private val lock = lock ?: this
init {
if (pref.prefMap.containsKey(key))
throw KPrefException("$key is already used elsewhere in preference ${pref.PREFERENCE_NAME}")
pref.prefMap.put(key, this@KPrefDelegate)
}
fun invalidate() {
_value = UNINITIALIZED
}
override val value: T
get() {
val _v1 = _value
if (_v1 !== UNINITIALIZED)
@Suppress("UNCHECKED_CAST")
return _v1 as T
return synchronized(lock) {
val _v2 = _value
if (_v2 !== UNINITIALIZED) {
@Suppress("UNCHECKED_CAST")
_v2 as T
} else {
_value = when (fallback) {
is Boolean -> pref.sp.getBoolean(key, fallback)
is Float -> pref.sp.getFloat(key, fallback)
is Int -> pref.sp.getInt(key, fallback)
is Long -> pref.sp.getLong(key, fallback)
is StringSet -> pref.sp.getStringSet(key, fallback)
is String -> pref.sp.getString(key, fallback)
else -> throw KPrefException(fallback)
}
@Suppress("UNCHECKED_CAST")
_value as T
}
}
}
override fun isInitialized(): Boolean = _value !== UNINITIALIZED
override fun toString(): String = if (isInitialized()) value.toString() else "Lazy value not initialized yet."
operator fun setValue(any: Any, property: kotlin.reflect.KProperty<*>, t: T) {
_value = t
val editor = pref.sp.edit()
when (t) {
is Boolean -> editor.putBoolean(key, t)
is Float -> editor.putFloat(key, t)
is Int -> editor.putInt(key, t)
is Long -> editor.putLong(key, t)
is StringSet -> editor.putStringSet(key, t)
is String -> editor.putString(key, t)
else -> throw KPrefException(t)
}
editor.apply()
}
}
class KPrefException(message: String) : IllegalAccessException(message) {
constructor(element: Any?) : this("Invalid type in pref cache: ${element?.javaClass?.simpleName ?: "null"}")
}
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