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/*
* Copyright 2018 Allan Wang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ca.allanwang.kau.kpref
import android.content.SharedPreferences
import ca.allanwang.kau.kotlin.ILazyResettable
/**
* Created by Allan Wang on 2017-06-07.
*
* Implementation of a kpref data item
* Contains a unique key for the shared preference as well as a nonnull fallback item
* Also contains an optional mutable postSetter that will be called every time a new value is given
*/
interface KPrefDelegate<T> : ILazyResettable<T> {
operator fun setValue(any: Any, property: kotlin.reflect.KProperty<*>, t: T)
}
class KPrefException(message: String) : IllegalAccessException(message)
class KPrefDelegateAndroid<T> internal constructor(
private val key: String,
private val fallback: T,
private val pref: KPref,
private val prefBuilder: KPrefBuilderAndroid,
private val transaction: KPrefTransaction<T>,
private var postSetter: (value: T) -> Unit = {}
) : KPrefDelegate<T> {
private object UNINITIALIZED
private val sp: SharedPreferences get() = prefBuilder.sp
@Volatile
private var _value: Any? = UNINITIALIZED
private val lock = this
init {
if (pref.prefMap.containsKey(key))
throw KPrefException("$key is already used elsewhere in preference ${pref.preferenceName}")
pref.prefMap[key] = this@KPrefDelegateAndroid
}
override fun invalidate() {
_value = UNINITIALIZED
}
@Suppress("UNCHECKED_CAST")
override val value: T
get() {
val _v1 = _value
if (_v1 !== UNINITIALIZED)
return _v1 as T
return synchronized(lock) {
val _v2 = _value
if (_v2 !== UNINITIALIZED) {
_v2 as T
} else {
_value = transaction.get(sp, key, fallback)
_value as T
}
}
}
override fun isInitialized(): Boolean = _value !== UNINITIALIZED
override fun toString(): String = if (isInitialized()) value.toString() else "Lazy kPref $key not initialized yet."
override operator fun setValue(any: Any, property: kotlin.reflect.KProperty<*>, t: T) {
_value = t
val editor = sp.edit()
transaction.set(editor, key, t)
editor.apply()
postSetter(t)
}
}
class KPrefDelegateInMemory<T> internal constructor(
private val key: String,
private val fallback: T,
private val pref: KPref,
private var postSetter: (value: T) -> Unit = {}
) : KPrefDelegate<T> {
private object UNINITIALIZED
@Volatile
private var _value: Any? = UNINITIALIZED
private val lock = this
init {
if (pref.prefMap.containsKey(key))
throw KPrefException("$key is already used elsewhere in preference ${pref.preferenceName}")
pref.prefMap[key] = this
}
override fun invalidate() {
// No op
}
@Suppress("UNCHECKED_CAST")
override val value: T
get() {
val _v1 = _value
if (_v1 !== UNINITIALIZED)
return _v1 as T
return synchronized(lock) {
val _v2 = _value
if (_v2 !== UNINITIALIZED) {
_v2 as T
} else {
_value = fallback
_value as T
}
}
}
override fun isInitialized(): Boolean = _value !== UNINITIALIZED
override fun toString(): String = if (isInitialized()) value.toString() else "Lazy kPref $key not initialized yet."
override operator fun setValue(any: Any, property: kotlin.reflect.KProperty<*>, t: T) {
_value = t
postSetter(t)
}
}
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