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package ca.allanwang.kau.kpref
import android.content.Context
import android.content.SharedPreferences
import ca.allanwang.kau.kotlin.ILazyResettable
import ca.allanwang.kau.logging.KL
/**
* Created by Allan Wang on 2017-06-07.
*
* Base class for shared preferences
* All objects extending this class must be called in
* the app's [android.app.Application] class
*
* See the [KPref.kpref] extensions for more details
*
* Furthermore, all kprefs are held in the [prefMap],
* so if you wish to reset a preference, you must also invalidate the kpref
* from that map
*
* You may optionally override [deleteKeys]. This will be called on initialization
* And delete all keys returned from that method
*/
open class KPref {
lateinit var PREFERENCE_NAME: String
lateinit var sp: SharedPreferences
fun initialize(c: Context, preferenceName: String) {
PREFERENCE_NAME = preferenceName
sp = c.applicationContext.getSharedPreferences(preferenceName, Context.MODE_PRIVATE)
KL.d { "Shared Preference $preferenceName has been initialized" }
val toDelete = deleteKeys()
if (toDelete.isNotEmpty()) {
val edit = sp.edit()
toDelete.forEach { edit.remove(it) }
edit.apply()
}
}
internal val prefMap: MutableMap<String, ILazyResettable<*>> = mutableMapOf()
fun reset() {
prefMap.values.forEach { it.invalidate() }
}
operator fun get(key: String): ILazyResettable<*>? = prefMap[key]
open fun deleteKeys(): Array<String> = arrayOf()
}
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