package bluej.stride.framedjava.ast;

import bluej.stride.framedjava.errors.CodeError;
import bluej.stride.framedjava.errors.ErrorShower;
import bluej.stride.generic.Frame;
import bluej.stride.slots.EditableSlot;
import threadchecker.OnThread;
import threadchecker.Tag;




| A fragment of program code which is stored in a choice slot.
|
| Needs to be overridden by subclasses to actually store the value in question,
| but provides an implementation of a lot of methods from SlotFragment, suitable for
| items which were stored in a choice slot.
|
public abstract class ChoiceSlotFragment
extends SlotFragment{    
   private final Frame frame;

   
   protected ChoiceSlotFragment(Frame f)
   {        
      this.frame = f;     
      }

   
   @Override
   @OnThread(Tag.FXPlatform)
   
   public void addError(CodeError codeError)
   {
      frame.addError(codeError);     
      }

   
   @Override
   
   public ErrorRelation checkCompileError(int startLine, int startColumn, int endLine, int endColumn)
   {
      if (frame == null)
           
      return ErrorRelation.CANNOT_SHOW;
       
      else{ return super.checkCompileError(startLine, startColumn, endLine, endColumn);
         }     
      }

   
   @Override
   @OnThread(Tag.FX)
   
   protected JavaFragment getCompileErrorRedirect()
   {
      EditableSlot slot = frame.getErrorShowRedirect();
      if (slot != null)
      return slot.getSlotElement();
       
      else{ return this;
         }     
      }

   
   @Override
   @OnThread(Tag.FX)
   
   public ErrorShower getErrorShower()
   {
      EditableSlot slot = frame.getErrorShowRedirect();
      if (slot != null)
           
      return slot;
       
      else{ return frame;
         }     
      } 
   }