if(right instanceof JLiteral)
if(right instanceof JLiteral) {
    public Object visitAssignmentExpression(JAssignmentExpression self,					    JExpression left,					    JExpression right) {	if(left instanceof JLocalVariableExpression) {	    currentModified.put(((JLocalVariableExpression)left).getVariable(),Boolean.TRUE);	    if(right instanceof JLiteral)		values.put(((JLocalVariableExpression)left).getVariable(),right);	}	return super.visitAssignmentExpression(self,left,right);    }