How to use

countArguments

method

in

com.mysema.query.types.FactoryExpressionUtils

private static int countArguments(FactoryExpression<?> expr) {
  int counter = 0;
  for (Expression<?> arg : expr.getArgs()) {
    if (arg instanceof ProjectionRole) {
      arg = ((ProjectionRole)arg).getProjection();
    }
    if (arg instanceof FactoryExpression<?>) {
      counter += countArguments((FactoryExpression<?>)arg);
    } else {
      counter++;
    }
  }
  return counter;
}

private static Object[] compress(List<Expression<?>> exprs, Object[] args) {
  Object[] rv = new Object[exprs.size()];
  int offset = 0;
  for (int i = 0; i < exprs.size(); i++) {
    Expression<?> expr = exprs.get(i);
    if (expr instanceof ProjectionRole) {
      expr = ((ProjectionRole) expr).getProjection();
    }
    if (expr instanceof FactoryExpression<?>) {
      FactoryExpression<?> fe = (FactoryExpression<?>)expr;
      int fullArgsLength = countArguments(fe);
      Object[] compressed = compress(fe.getArgs(), ArrayUtils.subarray(args, offset, offset + fullArgsLength));
      rv[i] = fe.newInstance(compressed);
      offset += fullArgsLength;
    } else {
      rv[i] = args[offset];
      offset++;
    }
  }
  return rv;
}