Field Detail

• GROUP_BY_ITEMS_LIST

  public static final String GROUP_BY_ITEMS_LIST

  Notify the list of StateObjects representing the GROUP BY items.

  See Also:

  Constant Field Values

Constructor Detail

• GroupByClauseStateObject

  public GroupByClauseStateObject​(AbstractSelectStatementStateObject parent)

  Creates a new GroupByClauseStateObject.

  Parameters:

  parent - The parent of this state object, which cannot be null

  Throws:

  NullPointerException - The given parent cannot be null

Method Detail

• accept

  public void accept​(StateObjectVisitor visitor)

  Visits this StateObject by the given visitor.

  Parameters:

  visitor - The visitor to visit this object

• addGroupByItem

  public StateObject addGroupByItem​(String path)

  Adds the given path as a select item, which can either be an identification variable or a state-field path expression.

  Parameters:

  path - Either an identification variable or a state-field path expression

  Returns:

  The StateObject encapsulating the given path

• getExpression

  public GroupByClause getExpression()

  Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.

  Specified by:

  getExpression in interface StateObject

  Overrides:

  getExpression in class AbstractStateObject

  Returns:

  The parsed object when a JPQL query is parsed and converted into a StateObject or null when the JPQL query is manually created (i.e. not from a string)

• getParent

  public AbstractSelectStatementStateObject getParent()

  Returns the parent of this StateObject.

  Specified by:

  getParent in interface StateObject

  Overrides:

  getParent in class AbstractStateObject

  Returns:

  Returns the parent of this StateObject, which is null only when this is the root of the hierarchy

• isEquivalent

  public boolean isEquivalent​(StateObject stateObject)

  Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.

  Specified by:

  isEquivalent in interface StateObject

  Overrides:

  isEquivalent in class AbstractStateObject

  Parameters:

  stateObject - The StateObject to compare its content to this one

  Returns:

  true if both object are equivalent; false otherwise

• parse

  public void parse​(String jpqlFragment)

  Parses the given JPQL fragment, which will represent the group by items. The fragment cannot start with the GROUP BY.

  Parameters:

  jpqlFragment - The string representation of the group by items

• setExpression

  public void setExpression​(GroupByClause expression)

  Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.

  Parameters:

  expression - The parsed object representing a GROUP BY clause