Created AssetFileUtils to provide valid File Extensions for various ReplayAsset implementations. This class has to be updated if new ReplayAsset implementations are added.

src/main/java/eu/crushedpixel/replaymod/assets/AssetFileUtils.java

@@ -0,0 +1,27 @@
+package eu.crushedpixel.replaymod.assets;
+
+import javax.imageio.ImageIO;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class AssetFileUtils {
+
+    //make sure to update these methods when adding new implementations of the ReplayAsset interface
+
+    public static String[] fileExtensionsForAssetClass(Class<? extends ReplayAsset> clazz) {
+        if(clazz == ReplayImageAsset.class) {
+            return ImageIO.getReaderFileSuffixes();
+        }
+
+        return null;
+    }
+
+    public static String[] getAllAvailableExtensions() {
+        List<String> extensions = new ArrayList<String>();
+
+        extensions.addAll(Arrays.asList(fileExtensionsForAssetClass(ReplayImageAsset.class)));
+
+        return extensions.toArray(new String[extensions.size()]);
+    }
+}