Initial commit

2026-05-31 05:22:40 +02:00 · 2025-04-27 15:07:05 +02:00
commit 2162c9fb40
157 changed files with 12179 additions and 0 deletions
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+/*
+ * CollectionViewModel.kt
+ * Implements the CollectionViewModel class
+ * A CollectionViewModel stores the collection of stations as live data
+ *
+ * This file is part of
+ * TRANSISTOR - Radio App for Android
+ *
+ * Copyright (c) 2015-22 - Y20K.org
+ * Licensed under the MIT-License
+ * http://opensource.org/licenses/MIT
+ */
+
+
+package com.michatec.radio.collection
+
+import android.app.Application
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.util.Log
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.viewModelScope
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import com.michatec.radio.Keys
+import com.michatec.radio.core.Collection
+import com.michatec.radio.helpers.FileHelper
+import kotlinx.coroutines.launch
+import java.util.*
+
+
+/*
+ * CollectionViewModel.class
+ */
+class CollectionViewModel(application: Application) : AndroidViewModel(application) {
+
+    /* Define log tag */
+    private val TAG: String = CollectionViewModel::class.java.simpleName
+
+    /* Main class variables */
+    val collectionLiveData: MutableLiveData<Collection> = MutableLiveData<Collection>()
+    val collectionSizeLiveData: MutableLiveData<Int> = MutableLiveData<Int>()
+    private var modificationDateViewModel: Date = Date()
+    private var collectionChangedReceiver: BroadcastReceiver
+
+
+    /* Init constructor */
+    init {
+        // load collection
+        loadCollection()
+        // create and register collection changed receiver
+        collectionChangedReceiver = createCollectionChangedReceiver()
+        LocalBroadcastManager.getInstance(application).registerReceiver(
+            collectionChangedReceiver,
+            IntentFilter(Keys.ACTION_COLLECTION_CHANGED)
+        )
+    }
+
+
+    /* Overrides onCleared */
+    override fun onCleared() {
+        super.onCleared()
+        LocalBroadcastManager.getInstance(getApplication())
+            .unregisterReceiver(collectionChangedReceiver)
+    }
+
+
+    /* Creates the collectionChangedReceiver - handles Keys.ACTION_COLLECTION_CHANGED */
+    private fun createCollectionChangedReceiver(): BroadcastReceiver {
+        return object : BroadcastReceiver() {
+            override fun onReceive(context: Context, intent: Intent) {
+                if (intent.hasExtra(Keys.EXTRA_COLLECTION_MODIFICATION_DATE)) {
+                    val date =
+                        Date(intent.getLongExtra(Keys.EXTRA_COLLECTION_MODIFICATION_DATE, 0L))
+                    // check if reload is necessary
+                    if (date.after(modificationDateViewModel)) {
+                        Log.v(
+                            TAG,
+                            "CollectionViewModel - reload collection after broadcast received."
+                        )
+                        loadCollection()
+                    }
+                }
+            }
+        }
+    }
+
+
+    /* Reads collection of radio stations from storage using GSON */
+    private fun loadCollection() {
+        Log.v(TAG, "Loading collection of stations from storage")
+        viewModelScope.launch {
+            // load collection on background thread
+            val collection: Collection = FileHelper.readCollectionSuspended(getApplication())
+            // get updated modification date
+            modificationDateViewModel = collection.modificationDate
+            // update collection view model
+            collectionLiveData.value = collection
+            // update collection sie
+            collectionSizeLiveData.value = collection.stations.size
+        }
+    }
+
+}