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/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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 com.android.systemui.flags
import android.util.Log
import org.json.JSONException
import org.json.JSONObject
private const val FIELD_VALUE = "value"
private const val FIELD_TYPE = "type"
private const val TYPE_BOOLEAN = "boolean"
private const val TYPE_STRING = "string"
private const val TYPE_INT = "int"
private const val TAG = "FlagSerializer"
abstract class FlagSerializer<T>(
private val type: String,
private val setter: (JSONObject, String, T) -> Unit,
private val getter: (JSONObject, String) -> T
) {
fun toSettingsData(value: T): String? {
return try {
JSONObject()
.put(FIELD_TYPE, type)
.also { setter(it, FIELD_VALUE, value) }
.toString()
} catch (e: JSONException) {
Log.w(TAG, "write error", e)
null
}
}
/**
* @throws InvalidFlagStorageException
*/
fun fromSettingsData(data: String?): T? {
if (data == null || data.isEmpty()) {
return null
}
try {
val json = JSONObject(data)
return if (json.getString(FIELD_TYPE) == type) {
getter(json, FIELD_VALUE)
} else {
null
}
} catch (e: JSONException) {
Log.w(TAG, "read error", e)
throw InvalidFlagStorageException()
}
}
}
object BooleanFlagSerializer : FlagSerializer<Boolean>(
TYPE_BOOLEAN,
JSONObject::put,
JSONObject::getBoolean
)
object StringFlagSerializer : FlagSerializer<String>(
TYPE_STRING,
JSONObject::put,
JSONObject::getString
)
object IntFlagSerializer : FlagSerializer<Int>(
TYPE_INT,
JSONObject::put,
JSONObject::getInt
)
class InvalidFlagStorageException : Exception("Data found but is invalid")
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