public class GroupByClauseStateObject extends AbstractListHolderStateObject<StateObject>
GROUP BY
construct enables the aggregation of values according to the
properties of an entity class.
groupby_clause ::= GROUP BY groupby_item {, groupby_item}*
GroupByClause
Modifier and Type | Field and Description |
---|---|
static java.lang.String |
GROUP_BY_ITEMS_LIST
Notify the list of
StateObjects representing the GROUP BY
items. |
Constructor and Description |
---|
GroupByClauseStateObject(AbstractSelectStatementStateObject parent)
Creates a new
GroupByClauseStateObject . |
Modifier and Type | Method and Description |
---|---|
void |
accept(StateObjectVisitor visitor)
Visits this
StateObject by the given visitor . |
StateObject |
addGroupByItem(java.lang.String path)
Adds the given path as a select item, which can either be an identification variable or a
state-field path expression.
|
GroupByClause |
getExpression()
Returns the actual parsed object if this
StateObject representation of the JPQL query
was created by parsing an existing JPQL query. |
AbstractSelectStatementStateObject |
getParent()
Returns the parent of this
StateObject . |
boolean |
isEquivalent(StateObject stateObject)
Determines whether the given
StateObject is equivalent to this one, i.e. |
void |
parse(java.lang.String jpqlFragment)
Parses the given JPQL fragment, which will represent the group by items.
|
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 . |
addItem, addItems, addListChangeListener, canMoveDown, canMoveUp, getItem, hasItems, items, itemsSize, moveDown, moveUp, removeItem, removeItems, removeListChangeListener
addPropertyChangeListener, children, decorate, equals, findIdentificationVariable, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, isDecorated, removePropertyChangeListener, setExpression, setParent, toString, toString, toText
addPropertyChangeListener, children, decorate, findIdentificationVariable, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getQueryBuilder, getRoot, isDecorated, removePropertyChangeListener, setParent, toString, toText
public static final java.lang.String GROUP_BY_ITEMS_LIST
StateObjects
representing the GROUP BY
items.public GroupByClauseStateObject(AbstractSelectStatementStateObject parent)
GroupByClauseStateObject
.parent
- The parent of this state object, which cannot be null
java.lang.NullPointerException
- The given parent cannot be null
public void accept(StateObjectVisitor visitor)
StateObject
by the given visitor
.visitor
- The visitor
to visit this objectpublic StateObject addGroupByItem(java.lang.String path)
path
- Either an identification variable or a state-field path expressionStateObject
encapsulating the given pathpublic GroupByClause getExpression()
StateObject
representation of the JPQL query
was created by parsing an existing JPQL query.getExpression
in interface StateObject
getExpression
in class AbstractStateObject
StateObject
or null
when the JPQL query is manually created (i.e. not from a string)public AbstractSelectStatementStateObject getParent()
StateObject
.getParent
in interface StateObject
getParent
in class AbstractStateObject
StateObject
, which is null
only when
this is the root of the hierarchypublic boolean isEquivalent(StateObject stateObject)
StateObject
is equivalent to this one, i.e. the
information of both StateObject
is the same.isEquivalent
in interface StateObject
isEquivalent
in class AbstractStateObject
stateObject
- The StateObject
to compare its content to this onetrue
if both object are equivalent; false
otherwisepublic void parse(java.lang.String jpqlFragment)
GROUP BY
.jpqlFragment
- The string representation of the group by itemspublic void setExpression(GroupByClause expression)
parsed object
object, which should only be
done when this object is instantiated during the conversion of a parsed JPQL query into
StateObjects
.expression
- The parsed object
representing a GROUP
BY
clauseEclipseLink 2.6.3, "build v20160428-59c81c5" API Reference