How to use

getItem

method

in

org.apache.metamodel.query.FromClause

private List<Query> splitQueryBasedOnSubQueries(int fromItemIndex) {
  Query subQuery = _query.getFromClause().getItem(fromItemIndex).getSubQuery();
  QuerySplitter subQuerySplitter = new QuerySplitter(_dataContext, subQuery);
  subQuerySplitter.setMaxRows(_maxRows);
  List<Query> splitQueries = subQuerySplitter.splitQuery();
  List<Query> result = new ArrayList<Query>(splitQueries.size());
  for (Query splitQuery : splitQueries) {
    Query newQuery = _query.clone();
    FromClause fromClause = newQuery.getFromClause();
    String alias = fromClause.getItem(fromItemIndex).getAlias();
    fromClause.removeItem(fromItemIndex);
    newQuery.from(new FromItem(splitQuery).setAlias(alias));
    result.add(newQuery);
  }
  return result;
}

  fromItem = _query.getFromClause().getItem(0);
  columnName = expression;
} else {

private void replaceParametersInFromClause(Object[] values, AtomicInteger parameterIndex, Query originalQuery,
    Query newQuery) {
  final List<FromItem> fromItems = originalQuery.getFromClause().getItems();
  int i = 0;
  for (FromItem fromItem : fromItems) {
    final Query subQuery = fromItem.getSubQuery();
    if (subQuery != null) {
      final Query newSubQuery = newQuery.getFromClause().getItem(i).getSubQuery();
      replaceParametersInQuery(values, parameterIndex, subQuery, newSubQuery);
      newQuery.getFromClause().removeItem(i);
      newQuery.getFromClause().addItem(i, new FromItem(newSubQuery).setAlias(fromItem.getAlias()));
    }
    i++;
  }
}

private void replaceParametersInFromClause(Object[] values, AtomicInteger parameterIndex, Query originalQuery,
    Query newQuery) {
  final List<FromItem> fromItems = originalQuery.getFromClause().getItems();
  int i = 0;
  for (FromItem fromItem : fromItems) {
    final Query subQuery = fromItem.getSubQuery();
    if (subQuery != null) {
      final Query newSubQuery = newQuery.getFromClause().getItem(i).getSubQuery();
      replaceParametersInQuery(values, parameterIndex, subQuery, newSubQuery);
      newQuery.getFromClause().removeItem(i);
      newQuery.getFromClause().addItem(i, new FromItem(newSubQuery).setAlias(fromItem.getAlias()));
    }
    i++;
  }
}

  fromItem = _query.getFromClause().getItem(0);
  columnName = expression;
} else {

private List<Query> splitQueryBasedOnSubQueries(int fromItemIndex) {
  Query subQuery = _query.getFromClause().getItem(fromItemIndex).getSubQuery();
  QuerySplitter subQuerySplitter = new QuerySplitter(_dataContext, subQuery);
  subQuerySplitter.setMaxRows(_maxRows);
  List<Query> splitQueries = subQuerySplitter.splitQuery();
  List<Query> result = new ArrayList<Query>(splitQueries.size());
  for (Query splitQuery : splitQueries) {
    Query newQuery = _query.clone();
    FromClause fromClause = newQuery.getFromClause();
    String alias = fromClause.getItem(fromItemIndex).getAlias();
    fromClause.removeItem(fromItemIndex);
    newQuery.from(new FromItem(splitQuery).setAlias(alias));
    result.add(newQuery);
  }
  return result;
}

if (singleFromItem && noGrouping) {
  final FromItem fromItem = query.getFromClause().getItem(0);
  final Table table = MetaModelHelper.resolveTable(fromItem);
  if (table != null) {

/**
 * Creates a clone of the {@link SelectItem} for use within a cloned {@link Query}.
 * 
 * @param clonedQuery a new {@link Query} object that represents the clone-to-be of a query. It is expected that
 *            {@link FromItem}s have already been cloned in this {@link Query}.
 * @return
 */
protected SelectItem clone(Query clonedQuery) {
  final SelectItem subQuerySelectItem = (_subQuerySelectItem == null ? null : _subQuerySelectItem.clone());
  final FromItem fromItem;
  if (_fromItem == null) {
    fromItem = null;
  } else if (clonedQuery != null && _query != null) {
    final int indexOfFromItem = _query.getFromClause().indexOf(_fromItem);
    if (indexOfFromItem != -1) {
      fromItem = clonedQuery.getFromClause().getItem(indexOfFromItem);
    } else {
      fromItem = _fromItem.clone();
    }
  } else {
    fromItem = _fromItem.clone();
  }
  final SelectItem s = new SelectItem(_column, fromItem, _function, _functionParameters, _expression,
      subQuerySelectItem, _alias, _functionApproximationAllowed);
  return s;
}

if (singleFromItem && noGrouping) {
  final FromItem fromItem = query.getFromClause().getItem(0);
  final Table table = MetaModelHelper.resolveTable(fromItem);
  if (table != null) {

/**
 * Creates a clone of the {@link SelectItem} for use within a cloned {@link Query}.
 * 
 * @param clonedQuery a new {@link Query} object that represents the clone-to-be of a query. It is expected that
 *            {@link FromItem}s have already been cloned in this {@link Query}.
 * @return
 */
protected SelectItem clone(Query clonedQuery) {
  final SelectItem subQuerySelectItem = (_subQuerySelectItem == null ? null : _subQuerySelectItem.clone());
  final FromItem fromItem;
  if (_fromItem == null) {
    fromItem = null;
  } else if (clonedQuery != null && _query != null) {
    final int indexOfFromItem = _query.getFromClause().indexOf(_fromItem);
    if (indexOfFromItem != -1) {
      fromItem = clonedQuery.getFromClause().getItem(indexOfFromItem);
    } else {
      fromItem = _fromItem.clone();
    }
  } else {
    fromItem = _fromItem.clone();
  }
  final SelectItem s = new SelectItem(_column, fromItem, _function, _functionParameters, _expression,
      subQuerySelectItem, _alias, _functionApproximationAllowed);
  return s;
}