Added the validation that the answers given are valid strings and pictures

voting-booth-gui/src/main/java/meerkat/voting/gui/configuration/VotingBoothConfiguration.java

@@ -1,6 +1,12 @@
 package meerkat.voting.gui.configuration;
+
+import com.google.protobuf.ByteString;
+import javafx.embed.swing.SwingFXUtils;
 import meerkat.protobuf.BallotQuestionUIElementOuterClass;
 
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+
 /**
  * Created by Vladimir Eliezer Tokarev on 10/1/2016.
  * This object contains all the questions and configurations needed for the voting-booth-gui work
@@ -28,6 +34,24 @@ public class VotingBoothConfiguration {
                 BallotQuestionUIElementOuterClass.ValueType.forNumber(NameSelectionQuestion.getAnswers().getAnswersType()) == null ){
             return false;
         }
+        // Check that all the given answers are valid bte strings that can be converted into strings
+        for (ByteString answer: NameSelectionQuestion.getAnswers().getAnswers().getAnswersList()){
+            try {
+                String strAnswer = answer.toStringUtf8();
+            } catch (Exception e){
+                return false;
+            }
+        }
+        // Check that all given byteStrings that are pictures can be converted into pictures
+        for (ByteString answer :NameSelectionByPictureQuestion.getAnswers().getAnswers().getAnswersList()){
+            try {
+                BufferedImage bufferedImage = ImageIO.read(answer.newInput());
+                SwingFXUtils.toFXImage(bufferedImage, null);
+            } catch (Exception e) {
+                return false;
+            }
+        }
+
         return true;
     }