How to use

getItemByReference

method

in

org.apache.metamodel.query.FromClause

/**
 * Retrieves a table by it's reference which may be it's alias or it's
 * qualified table name. Typically, this method is used to resolve a
 * SelectItem with a reference like "foo.bar", where "foo" may either be an
 * alias or a table name
 * 
 * @param reference
 * @return a FromItem which matches the provided reference string
 */
public FromItem getItemByReference(String reference) {
  if (reference == null) {
    return null;
  }
  for (final FromItem item : getItems()) {
    FromItem result = getItemByReference(item, reference);
    if (result != null) {
      return result;
    }
  }
  return null;
}

/**
 * Retrieves a table by it's reference which may be it's alias or it's
 * qualified table name. Typically, this method is used to resolve a
 * SelectItem with a reference like "foo.bar", where "foo" may either be an
 * alias or a table name
 * 
 * @param reference
 * @return a FromItem which matches the provided reference string
 */
public FromItem getItemByReference(String reference) {
  if (reference == null) {
    return null;
  }
  for (final FromItem item : getItems()) {
    FromItem result = getItemByReference(item, reference);
    if (result != null) {
      return result;
    }
  }
  return null;
}

final FromItem leftResult = getItemByReference(item.getLeftSide(), reference);
if (leftResult != null) {
  return leftResult;
final FromItem rightResult = getItemByReference(item.getRightSide(), reference);
if (rightResult != null) {
  return rightResult;

final FromItem leftResult = getItemByReference(item.getLeftSide(), reference);
if (leftResult != null) {
  return leftResult;
final FromItem rightResult = getItemByReference(item.getRightSide(), reference);
if (rightResult != null) {
  return rightResult;

final String prefix = expression.substring(0, splitIndex);
columnName = expression.substring(splitIndex + 1);
fromItem = _query.getFromClause().getItemByReference(prefix);

final String prefix = expression.substring(0, splitIndex);
columnName = expression.substring(splitIndex + 1);
fromItem = _query.getFromClause().getItemByReference(prefix);