93 lines
2.7 KiB
Kotlin
93 lines
2.7 KiB
Kotlin
package org.mosad.teapod.util
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import android.content.Context
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import android.net.Uri
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import android.util.Log
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import android.widget.Toast
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import com.google.gson.Gson
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import com.google.gson.JsonParser
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import kotlinx.coroutines.*
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import org.mosad.teapod.R
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import java.io.File
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import java.io.FileReader
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import java.io.FileWriter
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import java.lang.Exception
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import java.net.URI
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/**
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* This controller contains the logic for permanently saved data.
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* On load, it loads the saved files into the variables
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*/
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object StorageController {
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private const val fileNameMyList = "my_list.json"
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val myList = ArrayList<Int>() // a list of saved mediaIds
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fun load(context: Context) {
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loadMyList(context)
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}
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fun loadMyList(context: Context) {
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val file = File(context.filesDir, fileNameMyList)
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if (!file.exists()) runBlocking { saveMyList(context).join() }
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try {
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myList.clear()
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myList.addAll(JsonParser.parseString(file.readText()).asJsonArray.map { it.asInt }.distinct())
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} catch (ex: Exception) {
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myList.clear()
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Log.e(javaClass.name, "Parsing of My-List failed.")
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}
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}
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fun saveMyList(context: Context): Job {
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val file = File(context.filesDir, fileNameMyList)
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return GlobalScope.launch(Dispatchers.IO) {
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file.writeText(Gson().toJson(myList.distinct()))
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}
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}
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fun exportMyList(context: Context, uri: Uri) {
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try {
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context.contentResolver.openFileDescriptor(uri, "w")?.use {
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FileWriter(it.fileDescriptor).use { writer ->
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writer.write(Gson().toJson(myList.distinct()))
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}
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}
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} catch (ex: Exception) {
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Log.e(javaClass.name, "Exporting my list failed.", ex)
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}
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}
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/**
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* import my list from a (previously exported) json file
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* @param context the current context
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* @param uri the uri of the selected file
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* @return 0 if import was successfull, else 1
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*/
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fun importMyList(context: Context, uri: Uri): Int {
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try {
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val text = context.contentResolver.openFileDescriptor(uri, "r")?.use {
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FileReader(it.fileDescriptor).use { reader ->
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reader.readText()
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}
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}
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myList.clear()
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myList.addAll(JsonParser.parseString(text).asJsonArray.map { it.asInt }.distinct())
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// after the list has been imported also save it
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saveMyList(context)
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} catch (ex: Exception) {
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myList.clear()
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Log.e(javaClass.name, "Importing my list failed.", ex)
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return 1
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}
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return 0
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}
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} |