code: public Object visit(Lookup node) {
          
          Token dotToken = node.getDot();
          SourceInfo info = dotToken.getSourceInfo();
          
          if (info != null && info.getStartPosition() == mDotPosition) {
  			
              // Found the matching position, so this node represents the
              // lookup expression that we are looking for.
              
              Expression expression = node.getExpression();
              
              Type type = expression.getType();                
              if (type != null) {
                  // Save the type class
                  mType = type.getObjectClass();                    
              }                
              
              return null;
          }
          
          return super.visit(node);
      }
docs: Overridden method