public final class HierarchicalQueryClause extends AbstractExpression
START WITH
specifies the root row(s) of the hierarchy.
CONNECT BY
specifies the relationship between parent rows and child rows of
the hierarchy.
hierarchical_query_clause ::= [start_with_clause] connectby_clause [order_siblings_by_clause]
StartWithClause
,
ConnectByClause
,
OrderSiblingsByClause
COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE
ABS, ALL, AND, ANY, AS, AS_OF, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXTRACT, FALSE, FETCH, FIRST, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LAST, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, ORDER_SIBLINGS_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, REGEXP, SCN, SELECT, SET, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE
Constructor and Description |
---|
HierarchicalQueryClause(AbstractExpression parent)
Creates a new
HierarchicalQueryClause . |
Modifier and Type | Method and Description |
---|---|
void |
accept(ExpressionVisitor visitor)
Visits this
Expression by the given visitor . |
void |
acceptChildren(ExpressionVisitor visitor)
Visits the children of this
Expression . |
JPQLQueryBNF |
findQueryBNF(Expression expression)
Retrieves the
JPQLQueryBNF that represents the fragment of this Expression
that was used when parsing the given Expression . |
Expression |
getConnectByClause()
Returns the
Expression representing the CONNECT BY clause. |
Expression |
getOrderSiblingsByClause()
Returns the
Expression representing the ORDER SIBLINGS BY clause. |
JPQLQueryBNF |
getQueryBNF()
Returns the BNF of this
Expression . |
Expression |
getStartWithClause()
Returns the
Expression representing the START WITH clause. |
boolean |
hasConnectByClause()
Determines whether the CONNECT BY clause is defined.
|
boolean |
hasOrderSiblingsByClause()
Determines whether the ORDER SIBLINGS BY clause is defined.
|
boolean |
hasSpaceAfterConnectByClause()
Determines whether a whitespace was found after the
CONNECT BY clause. |
boolean |
hasSpaceAfterStartWithClause()
Determines whether a whitespace was found after the
START WITH clause. |
boolean |
hasStartWithClause()
Determines whether the START WITH clause is defined.
|
children, getGrammar, getIdentifierVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, isAncestor, orderedChildren, populatePosition, toActualText, toParsedText, toString
public HierarchicalQueryClause(AbstractExpression parent)
HierarchicalQueryClause
.parent
- The parent of this expressionpublic void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.visitor
- The ExpressionVisitor
to visit this objectpublic void acceptChildren(ExpressionVisitor visitor)
Expression
. This method can be used to optimize traversing
the children since a new list is not created every time Expression.children()
is called.
This does not traverse the Expression
sub-hierarchy, use a subclass of
AbstractTraverseChildrenVisitor
in order to traverse the entire sub-hierarchy.
visitor
- The visitor
to visit the children of this object.public JPQLQueryBNF findQueryBNF(Expression expression)
JPQLQueryBNF
that represents the fragment of this Expression
that was used when parsing the given Expression
.findQueryBNF
in interface Expression
findQueryBNF
in class AbstractExpression
expression
- The Expression
that is a descendant of this oneJPQLQueryBNF
that was used to parse the given expressionpublic Expression getConnectByClause()
Expression
representing the CONNECT BY clause.public Expression getOrderSiblingsByClause()
Expression
representing the ORDER SIBLINGS BY clause.public JPQLQueryBNF getQueryBNF()
Expression
.JPQLQueryBNF
, which represents the grammar of this Expression
public Expression getStartWithClause()
Expression
representing the START WITH clause.public boolean hasConnectByClause()
true
if the query that got parsed had the CONNECT BY clausepublic boolean hasOrderSiblingsByClause()
true
if the query that got parsed had the ORDER SIBLINGS BY clausepublic boolean hasSpaceAfterConnectByClause()
CONNECT BY
clause. In
some cases, the space is owned by a child of the hierarchical query clause.true
if there was a whitespace after the CONNECT BY
clause and owned by this expression; false
otherwisepublic boolean hasSpaceAfterStartWithClause()
START WITH
clause. In
some cases, the space is owned by a child of the hierarchical query clause.true
if there was a whitespace after the START WITH
clause and owned by this expression; false
otherwisepublic boolean hasStartWithClause()
true
if the query that got parsed had the START WITH clauseEclipseLink 2.6.3, "build v20160428-59c81c5" API Reference