Pandroid: GlobalConfig and create node data storage

src/pandroid/app/src/main/AndroidManifest.xml

@@ -11,6 +11,7 @@
         android:glEsVersion="0x0030001"/>
 
     <application
+        android:name=".app.PandroidApplication"
         android:requestLegacyExternalStorage="true"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/PandroidApplication.java

@@ -0,0 +1,21 @@
+package com.panda3ds.pandroid.app;
+
+import android.app.Application;
+import android.content.Context;
+
+import com.panda3ds.pandroid.data.config.GlobalConfig;
+
+public class PandroidApplication extends Application {
+    private static Context appContext;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        appContext = this;
+        GlobalConfig.initialize();
+    }
+
+    public static Context getAppContext() {
+        return appContext;
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/data/config/GlobalConfig.java

@@ -0,0 +1,60 @@
+package com.panda3ds.pandroid.data.config;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import com.panda3ds.pandroid.app.PandroidApplication;
+import com.panda3ds.pandroid.utils.Constants;
+
+import java.io.Serializable;
+
+public class GlobalConfig {
+    private static SharedPreferences data;
+
+    public static void initialize() {
+        data = PandroidApplication.getAppContext()
+                .getSharedPreferences(Constants.PREF_GLOBAL_CONFIG, Context.MODE_PRIVATE);
+    }
+
+    public static <T extends Serializable> T get(Key<T> key) {
+        Serializable value;
+        if (key.defaultValue instanceof String) {
+            value = data.getString(key.name, (String) key.defaultValue);
+        } else if (key.defaultValue instanceof Integer) {
+            value = data.getInt(key.name, (int) key.defaultValue);
+        } else if (key.defaultValue instanceof Boolean) {
+            value = data.getBoolean(key.name, (boolean) key.defaultValue);
+        } else if (key.defaultValue instanceof Long) {
+            value = data.getLong(key.name, (long) key.defaultValue);
+        } else {
+            value = data.getFloat(key.name, (float) key.defaultValue);
+        }
+        return (T) value;
+    }
+
+    public static synchronized <T extends Serializable> void set(Key<T> key, T value) {
+        if (value instanceof String) {
+            data.edit().putString(key.name, (String) value).apply();
+        } else if (value instanceof Integer) {
+            data.edit().putInt(key.name, (int) value).apply();
+        } else if (value instanceof Boolean) {
+            data.edit().putBoolean(key.name, (boolean) value).apply();
+        } else if (value instanceof Long) {
+            data.edit().putLong(key.name, (long) value).apply();
+        } else if (value instanceof Float) {
+            data.edit().putFloat(key.name, (float) value).apply();
+        } else {
+            throw new IllegalArgumentException("Invalid global config value instance");
+        }
+    }
+
+    private static class Key<T extends Serializable> {
+        private final String name;
+        private final T defaultValue;
+
+        private Key(String name, T defaultValue) {
+            this.name = name;
+            this.defaultValue = defaultValue;
+        }
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/Constants.java

@@ -20,4 +20,6 @@ public class Constants {
 
 	public static final String ACTIVITY_PARAMETER_PATH = "path";
 	public static final String LOG_TAG = "pandroid";
+
+	public static final String PREF_GLOBAL_CONFIG = "app.GlobalConfig";
 }