Add error handling and cursor validation.

Author: tuancoltech

utils/src/main/java/ai/elimu/content_provider/utils/converter/CursorToVideoGsonConverter.kt

@@ -10,34 +10,50 @@ object CursorToVideoGsonConverter {
 
     fun getVideoGson(cursor: Cursor): VideoGson {
         Log.i(TAG, "getVideoGson")
-
         Log.i(TAG, "Arrays.toString(cursor.getColumnNames()): "
                 + cursor.columnNames.contentToString())
-
+        if (cursor.isBeforeFirst && !cursor.moveToFirst()) {
+            throw IllegalArgumentException("Cursor must be positioned on a valid row")
+        }
         val columnId = cursor.getColumnIndex("id")
+        if (columnId == -1) {
+            throw IllegalArgumentException("Column 'id' not found in cursor")
+        }
         val id = cursor.getLong(columnId)
         Log.i(TAG, "id: $id")
 
         val columnRevisionNumber = cursor.getColumnIndex("revisionNumber")
+        if (columnRevisionNumber == -1) {
+            throw IllegalArgumentException("Column 'revisionNumber' not found in cursor")
+        }
         val revisionNumber = cursor.getInt(columnRevisionNumber)
         Log.i(TAG, "revisionNumber: $revisionNumber")
 
         val columnTitle = cursor.getColumnIndex("title")
+        if (columnTitle == -1) {
+            throw IllegalArgumentException("Column 'title' not found in cursor")
+        }
         val title = cursor.getString(columnTitle)
         Log.i(TAG, "title: \"$title\"")
 
         val columnVideoFormat = cursor.getColumnIndex("videoFormat")
+        if (columnVideoFormat == -1) {
+            throw IllegalArgumentException("Column 'videoFormat' not found in cursor")
+        }
         val videoFormatAsString = cursor.getString(columnVideoFormat)
         Log.i(TAG, "videoFormatAsString: $videoFormatAsString")
-        val videoFormat = VideoFormat.valueOf(videoFormatAsString)
+        val videoFormat = try {
+            VideoFormat.valueOf(videoFormatAsString)
+        } catch (e: IllegalArgumentException) {
+            Log.e(TAG, "Invalid video format: $videoFormatAsString", e)
+            throw IllegalArgumentException("Invalid video format: $videoFormatAsString", e)
+        }
         Log.i(TAG, "videoFormat: $videoFormat")
-
         val video = VideoGson()
         video.id = id
         video.revisionNumber = revisionNumber
         video.title = title
         video.videoFormat = videoFormat
-
         return video
     }
 }