All Known Implementing Classes:

AbsExpression, AbstractConditionalClause, AbstractDoubleEncapsulatedExpression, AbstractEncapsulatedExpression, AbstractExpression, AbstractFromClause, AbstractOrderByClause, AbstractPathExpression, AbstractSchemaName, AbstractSelectClause, AbstractSelectStatement, AbstractSingleEncapsulatedExpression, AbstractTripleEncapsulatedExpression, AdditionExpression, AggregateFunction, AllOrAnyExpression, AndExpression, ArithmeticExpression, ArithmeticFactor, AsOfClause, AvgFunction, BadExpression, BetweenExpression, CaseExpression, CastExpression, CoalesceExpression, CollectionExpression, CollectionMemberDeclaration, CollectionMemberExpression, CollectionValuedPathExpression, ComparisonExpression, CompoundExpression, ConcatExpression, ConnectByClause, ConstructorExpression, CountFunction, DatabaseType, DateTime, DefaultStringExpression, DeleteClause, DeleteStatement, DivisionExpression, EmptyCollectionComparisonExpression, EncapsulatedIdentificationVariableExpression, EntityTypeLiteral, EntryExpression, ExistsExpression, ExtractExpression, FromClause, FunctionExpression, GroupByClause, HavingClause, HierarchicalQueryClause, IdentificationVariable, IdentificationVariableDeclaration, IndexExpression, InExpression, InputParameter, Join, JPQLExpression, KeyExpression, KeywordExpression, LengthExpression, LikeExpression, LocateExpression, LogicalExpression, LowerExpression, MaxFunction, MinFunction, ModExpression, MultiplicationExpression, NotExpression, NullComparisonExpression, NullExpression, NullIfExpression, NumericLiteral, ObjectExpression, OnClause, OrderByClause, OrderByItem, OrderSiblingsByClause, OrExpression, RangeVariableDeclaration, RegexpExpression, ResultVariable, SelectClause, SelectStatement, SimpleFromClause, SimpleSelectClause, SimpleSelectStatement, SizeExpression, SqrtExpression, StartWithClause, StateFieldPathExpression, StringLiteral, SubExpression, SubstringExpression, SubtractionExpression, SumFunction, TableExpression, TableVariableDeclaration, TreatExpression, TrimExpression, TypeExpression, UnionClause, UnknownExpression, UpdateClause, UpdateItem, UpdateStatement, UpperExpression, ValueExpression, WhenClause, WhereClause
```
public interface Expression
```
This is the root interface of the parsed tree representation of a JPQL query. The way a JPQL query is parsed is based on the JPQL grammar used.
Provisional API: This interface is part of an interim API that is still under development and expected to change significantly before reaching stability. It is available at this early stage to solicit feedback from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken (repeatedly) as the API evolves.

Version:

2.5

See Also:

JPQLGrammar

Author:

Pascal Filion

Since:

2.3

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`ABS`	The constant for 'ABS'.
`static java.lang.String`	`ALL`	The constant for 'ALL'.
`static java.lang.String`	`AND`	The constant for 'AND'.
`static java.lang.String`	`ANY`	The constant for 'ANY'.
`static java.lang.String`	`AS`	The constant for 'AS'.
`static java.lang.String`	`AS_OF`	The constant for 'AS OF'.
`static java.lang.String`	`ASC`	The constant for 'ASC'.
`static java.lang.String`	`AVG`	The constant for 'AVG'.
`static java.lang.String`	`BETWEEN`	The constant for 'BETWEEN'.
`static java.lang.String`	`BIT_LENGTH`	The constant for 'BIT_LENGTH', which is an unused keyword.
`static java.lang.String`	`BOTH`	The constant for 'BOTH'.
`static java.lang.String`	`CASE`	The constant for the identifier 'CASE'.
`static java.lang.String`	`CAST`	The constant for the identifier 'CAST'.
`static java.lang.String`	`CHAR_LENGTH`	The constant for 'CHAR_LENGTH', which is an unused keyword.
`static java.lang.String`	`CHARACTER_LENGTH`	The constant for 'CHARACTER_LENGTH', which is an unused keyword.
`static java.lang.String`	`CLASS`	The constant for 'CLASS', which is an unused keyword.
`static java.lang.String`	`COALESCE`	The constant for 'COALESCE'.
`static java.lang.String`	`COLUMN`	The constant 'COLUMN', which is an EclipseLink specific identifier that was added in version 2.4.
`static java.lang.String`	`CONCAT`	The constant for 'CONCAT'.
`static java.lang.String`	`CONNECT_BY`	The constant for 'CONNECT BY'.
`static java.lang.String`	`COUNT`	The constant for 'COUNT'.
`static java.lang.String`	`CURRENT_DATE`	The constant for 'CURRENT_DATE'.
`static java.lang.String`	`CURRENT_TIME`	The constant for 'CURRENT_DATE'.
`static java.lang.String`	`CURRENT_TIMESTAMP`	The constant for 'CURRENT_TIMESTAMP'.
`static java.lang.String`	`DELETE`	The constant for 'DELETE'.
`static java.lang.String`	`DELETE_FROM`	The constant for 'DELETE FROM'.
`static java.lang.String`	`DESC`	The constant for 'DESC'.
`static java.lang.String`	`DIFFERENT`	The constant for '<>'.
`static java.lang.String`	`DISTINCT`	The constant for 'DISTINCT'.
`static java.lang.String`	`DIVISION`	The constant for the division sign '/'.
`static java.lang.String`	`ELSE`	The constant for the identifier 'ELSE'.
`static java.lang.String`	`EMPTY`	The constant for 'EMPTY'.
`static java.lang.String`	`END`	The constant for the identifier 'END'.
`static java.lang.String`	`ENTRY`	The constant for 'ENTRY'.
`static java.lang.String`	`EQUAL`	The constant for '='.
`static java.lang.String`	`ESCAPE`	The constant for 'ESCAPE'.
`static java.lang.String`	`EXCEPT`	The constant for 'EXCEPT'.
`static java.lang.String`	`EXISTS`	The constant for 'EXISTS'.
`static java.lang.String`	`EXTRACT`	The constant for 'EXTRACT'.
`static java.lang.String`	`FALSE`	The constant for 'FALSE'.
`static java.lang.String`	`FETCH`	A constant for 'FETCH'.
`static java.lang.String`	`FIRST`	The constant for 'FIRST'.
`static java.lang.String`	`FROM`	The constant for 'FROM'.
`static java.lang.String`	`FUNC`	The constant 'FUNC', which is an EclipseLink specific identifier that was added in version 2.1.
`static java.lang.String`	`FUNCTION`	The constant 'FUNCTION', part of JPA 2.1.
`static java.lang.String`	`GREATER_THAN`	The constant for '>'.
`static java.lang.String`	`GREATER_THAN_OR_EQUAL`	The constant for '>='.
`static java.lang.String`	`GROUP_BY`	The constant for 'GROUP BY'.
`static java.lang.String`	`HAVING`	The constant for 'HAVING'.
`static java.lang.String`	`IN`	The constant for 'IN'.
`static java.lang.String`	`INDEX`	The constant for 'INDEX'.
`static java.lang.String`	`INNER`	The constant for 'INNER'.
`static java.lang.String`	`INNER_JOIN`	The constant for 'INNER JOIN'.
`static java.lang.String`	`INNER_JOIN_FETCH`	The constant for 'INNER JOIN FETCH'.
`static java.lang.String`	`INTERSECT`	The constant for 'INTERSECT'.
`static java.lang.String`	`IS`	The constant for 'IS'.
`static java.lang.String`	`IS_EMPTY`	The constant for 'IS EMPTY'.
`static java.lang.String`	`IS_NOT_EMPTY`	The constant for 'IS NOT EMPTY'.
`static java.lang.String`	`IS_NOT_NULL`	The constant for 'IS NOT NULL'.
`static java.lang.String`	`IS_NULL`	The constant for 'IS NULL'.
`static java.lang.String`	`JOIN`	The constant for 'JOIN'.
`static java.lang.String`	`JOIN_FETCH`	The constant for 'JOIN FETCH'.
`static java.lang.String`	`KEY`	The constant for 'KEY'.
`static java.lang.String`	`LAST`	The constant for 'LAST'.
`static java.lang.String`	`LEADING`	The constant for 'LEADING'.
`static java.lang.String`	`LEFT`	The constant for 'LEFT'.
`static java.lang.String`	`LEFT_JOIN`	The constant for 'LEFT JOIN'.
`static java.lang.String`	`LEFT_JOIN_FETCH`	The constant for 'LEFT JOIN FETCH'.
`static java.lang.String`	`LEFT_OUTER_JOIN`	The constant for 'LEFT OUTER JOIN'.
`static java.lang.String`	`LEFT_OUTER_JOIN_FETCH`	The constant for 'LEFT OUTER JOIN FETCH'.
`static java.lang.String`	`LENGTH`	The constant for 'LENGTH'.
`static java.lang.String`	`LIKE`	The constant for 'LIKE'.
`static java.lang.String`	`LOCATE`	The constant for 'LOCATE'.
`static java.lang.String`	`LOWER`	The constant for 'LOWER'.
`static java.lang.String`	`LOWER_THAN`	The constant for '<'.
`static java.lang.String`	`LOWER_THAN_OR_EQUAL`	The constant for '<='.
`static java.lang.String`	`MAX`	The constant for 'MAX'.
`static java.lang.String`	`MEMBER`	The constant for 'MEMBER'.
`static java.lang.String`	`MEMBER_OF`	The constant for 'MEMBER OF'.
`static java.lang.String`	`MIN`	The constant for 'MIN'.
`static java.lang.String`	`MINUS`	The constant for the minus sign '-'.
`static java.lang.String`	`MOD`	The constant for 'MOD'.
`static java.lang.String`	`MULTIPLICATION`	The constant for multiplication sign '*'.
`static java.lang.String`	`NAMED_PARAMETER`	The constant for ':'.
`static java.lang.String`	`NEW`	The constant for 'NEW'.
`static java.lang.String`	`NOT`	The constant for 'NOT'.
`static java.lang.String`	`NOT_BETWEEN`	The constant for 'NOT BETWEEN'.
`static java.lang.String`	`NOT_EQUAL`	The constant for '!
`static java.lang.String`	`NOT_EXISTS`	The constant for 'NOT EXISTS'.
`static java.lang.String`	`NOT_IN`	The constant for 'NOT IN'.
`static java.lang.String`	`NOT_LIKE`	The constant for 'NOT LIKE'.
`static java.lang.String`	`NOT_MEMBER`	The constant for 'NOT MEMBER'.
`static java.lang.String`	`NOT_MEMBER_OF`	The constant for 'NOT MEMBER OF'.
`static java.lang.String`	`NULL`	The constant for 'NULL'.
`static java.lang.String`	`NULLIF`	The constant for 'NULLIF'.
`static java.lang.String`	`NULLS`	The constant for 'NULLS'.
`static java.lang.String`	`NULLS_FIRST`	The constant for 'NULLS FIRST'.
`static java.lang.String`	`NULLS_LAST`	The constant for 'NULLS LAST'.
`static java.lang.String`	`OBJECT`	The constant for 'OBJECT'.
`static java.lang.String`	`OF`	The constant for 'OF'.
`static java.lang.String`	`ON`	The constant for 'ON', which is an EclipseLink specific identifier that was added in version 2.4.
`static java.lang.String`	`OPERATOR`	The constant 'OPERATOR', which is an EclipseLink specific identifier that was added in version 2.4.
`static java.lang.String`	`OR`	The constant for 'OR'.
`static java.lang.String`	`ORDER_BY`	The constant for 'ORDER BY'.
`static java.lang.String`	`ORDER_SIBLINGS_BY`	The constant for 'ORDER SIBLINGS BY'.
`static java.lang.String`	`OUTER`	The constant for 'OUTER'.
`static java.lang.String`	`PLUS`	The constant for for the plus sign '+'.
`static java.lang.String`	`POSITION`	The constant for 'POSITION', which is an unused keyword.
`static java.lang.String`	`POSITIONAL_PARAMETER`	The constant for '?'.
`static java.lang.String`	`QUOTE`	The constant for single quote.
`static java.lang.String`	`REGEXP`	The constant for 'REGEXP'.
`static java.lang.String`	`SCN`	The constant for 'SCN'.
`static java.lang.String`	`SELECT`	The constant for 'SELECT'.
`static java.lang.String`	`SET`	The constant for 'SET'.
`static java.lang.String`	`SIZE`	The constant for 'SIZE'.
`static java.lang.String`	`SOME`	The constant for 'SOME'.
`static java.lang.String`	`SQL`	The constant 'SQL', which is an EclipseLink specific identifier that was added in version 2.4.
`static java.lang.String`	`SQRT`	The constant for 'SQRT'.
`static java.lang.String`	`START_WITH`	The constant for 'WHERE'.
`static java.lang.String`	`SUBSTRING`	The constant for 'SUBSTRING'.
`static java.lang.String`	`SUM`	The constant for 'SUM'.
`static java.lang.String`	`TABLE`	The constant for 'TABLE'.
`static java.lang.String`	`THEN`	The constant for 'THEN'.
`static java.lang.String`	`TIMESTAMP`	The constant for 'TIMESTAMP'.
`static java.lang.String`	`TRAILING`	The constant for 'TRAILING'.
`static java.lang.String`	`TREAT`	The constant for 'TREAT', which is an EclipseLink specific identifier that was added in version 2.1.
`static java.lang.String`	`TRIM`	The constant for 'TRIM'.
`static java.lang.String`	`TRUE`	The constant for 'TRUE'.
`static java.lang.String`	`TYPE`	The constant for 'TYPE'.
`static java.lang.String`	`UNION`	The constant for 'UNION'.
`static java.lang.String`	`UNKNOWN`	The constant for 'UNKNOWN', which is an unused keyword.
`static java.lang.String`	`UPDATE`	The constant for 'UPDATE'.
`static java.lang.String`	`UPPER`	The constant for 'UPPER'.
`static java.lang.String`	`VALUE`	The constant for 'VALUE'.
`static java.lang.String`	`WHEN`	The constant for the identifier 'WHEN'.
`static java.lang.String`	`WHERE`	The constant for 'WHERE'.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`accept(ExpressionVisitor visitor)`	Visits this `Expression` by the given `visitor`.
`void`	`acceptChildren(ExpressionVisitor visitor)`	Visits the children of this `Expression`.
`ListIterable<Expression>`	`children()`	Returns 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`.
`JPQLGrammar`	`getGrammar()`	Returns the `JPQLGrammar` that defines how the JPQL query was parsed.
`int`	`getLength()`	Returns the length of the string representation of this `Expression`, which is the length of the text generated by `toActualText()`.
`int`	`getOffset()`	Returns the position of this `Expression` within its parent hierarchy.
`Expression`	`getParent()`	Returns the parent of this `Expression`.
`JPQLQueryBNF`	`getQueryBNF()`	Returns the BNF of this `Expression`.
`JPQLExpression`	`getRoot()`	Retrieves the root node of the parsed tree hierarchy.
`boolean`	`isAncestor(Expression expression)`	Determines whether this `Expression` is a parent of the given `Expression`.
`ListIterable<Expression>`	`orderedChildren()`	Returns the list representing this `Expression` and its children.
`void`	`populatePosition(QueryPosition queryPosition, int position)`	Retrieves the `Expression` located at the given position using the actual query, which may have extra whitespace.
`java.lang.String`	`toActualText()`	Generates a string representation of this `Expression`, which needs to include any characters that are considered virtual, i.e. that was parsed when the query is incomplete and is needed for functionality like content assist.
`java.lang.String`	`toParsedText()`	Returns a string representation of this `Expression` and its children.

- Field Detail
  - ABS
```
static final java.lang.String ABS
```
    The constant for 'ABS'.
    
    See Also:
    
    Constant Field Values
  - ALL
```
static final java.lang.String ALL
```
    The constant for 'ALL'.
    
    See Also:
    
    Constant Field Values
  - AND
```
static final java.lang.String AND
```
    The constant for 'AND'.
    
    See Also:
    
    Constant Field Values
  - ANY
```
static final java.lang.String ANY
```
    The constant for 'ANY'.
    
    See Also:
    
    Constant Field Values
  - AS
```
static final java.lang.String AS
```
    The constant for 'AS'.
    
    See Also:
    
    Constant Field Values
  - AS_OF
```
static final java.lang.String AS_OF
```
    The constant for 'AS OF'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - ASC
```
static final java.lang.String ASC
```
    The constant for 'ASC'.
    
    See Also:
    
    Constant Field Values
  - AVG
```
static final java.lang.String AVG
```
    The constant for 'AVG'.
    
    See Also:
    
    Constant Field Values
  - BETWEEN
```
static final java.lang.String BETWEEN
```
    The constant for 'BETWEEN'.
    
    See Also:
    
    Constant Field Values
  - BIT_LENGTH
```
static final java.lang.String BIT_LENGTH
```
    The constant for 'BIT_LENGTH', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - BOTH
```
static final java.lang.String BOTH
```
    The constant for 'BOTH'.
    
    See Also:
    
    Constant Field Values
  - CASE
```
static final java.lang.String CASE
```
    The constant for the identifier 'CASE'.
    
    See Also:
    
    Constant Field Values
  - CAST
```
static final java.lang.String CAST
```
    The constant for the identifier 'CAST'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - CHAR_LENGTH
```
static final java.lang.String CHAR_LENGTH
```
    The constant for 'CHAR_LENGTH', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - CHARACTER_LENGTH
```
static final java.lang.String CHARACTER_LENGTH
```
    The constant for 'CHARACTER_LENGTH', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - CLASS
```
static final java.lang.String CLASS
```
    The constant for 'CLASS', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - COALESCE
```
static final java.lang.String COALESCE
```
    The constant for 'COALESCE'.
    
    See Also:
    
    Constant Field Values
  - COLUMN
```
static final java.lang.String COLUMN
```
    The constant 'COLUMN', which is an EclipseLink specific identifier that was added in version 2.4.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - CONCAT
```
static final java.lang.String CONCAT
```
    The constant for 'CONCAT'.
    
    See Also:
    
    Constant Field Values
  - CONNECT_BY
```
static final java.lang.String CONNECT_BY
```
    The constant for 'CONNECT BY'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - COUNT
```
static final java.lang.String COUNT
```
    The constant for 'COUNT'.
    
    See Also:
    
    Constant Field Values
  - CURRENT_DATE
```
static final java.lang.String CURRENT_DATE
```
    The constant for 'CURRENT_DATE'.
    
    See Also:
    
    Constant Field Values
  - CURRENT_TIME
```
static final java.lang.String CURRENT_TIME
```
    The constant for 'CURRENT_DATE'.
    
    See Also:
    
    Constant Field Values
  - CURRENT_TIMESTAMP
```
static final java.lang.String CURRENT_TIMESTAMP
```
    The constant for 'CURRENT_TIMESTAMP'.
    
    See Also:
    
    Constant Field Values
  - DELETE
```
static final java.lang.String DELETE
```
    The constant for 'DELETE'.
    
    See Also:
    
    Constant Field Values
  - DELETE_FROM
```
static final java.lang.String DELETE_FROM
```
    The constant for 'DELETE FROM'.
    
    See Also:
    
    Constant Field Values
  - DESC
```
static final java.lang.String DESC
```
    The constant for 'DESC'.
    
    See Also:
    
    Constant Field Values
  - DIFFERENT
```
static final java.lang.String DIFFERENT
```
    The constant for '<>'.
    
    See Also:
    
    Constant Field Values
  - DISTINCT
```
static final java.lang.String DISTINCT
```
    The constant for 'DISTINCT'.
    
    See Also:
    
    Constant Field Values
  - DIVISION
```
static final java.lang.String DIVISION
```
    The constant for the division sign '/'.
    
    See Also:
    
    Constant Field Values
  - ELSE
```
static final java.lang.String ELSE
```
    The constant for the identifier 'ELSE'.
    
    See Also:
    
    Constant Field Values
  - EMPTY
```
static final java.lang.String EMPTY
```
    The constant for 'EMPTY'.
    
    See Also:
    
    Constant Field Values
  - END
```
static final java.lang.String END
```
    The constant for the identifier 'END'.
    
    See Also:
    
    Constant Field Values
  - ENTRY
```
static final java.lang.String ENTRY
```
    The constant for 'ENTRY'.
    
    See Also:
    
    Constant Field Values
  - EQUAL
```
static final java.lang.String EQUAL
```
    The constant for '='.
    
    See Also:
    
    Constant Field Values
  - ESCAPE
```
static final java.lang.String ESCAPE
```
    The constant for 'ESCAPE'.
    
    See Also:
    
    Constant Field Values
  - EXCEPT
```
static final java.lang.String EXCEPT
```
    The constant for 'EXCEPT'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - EXISTS
```
static final java.lang.String EXISTS
```
    The constant for 'EXISTS'.
    
    See Also:
    
    Constant Field Values
  - EXTRACT
```
static final java.lang.String EXTRACT
```
    The constant for 'EXTRACT'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - FALSE
```
static final java.lang.String FALSE
```
    The constant for 'FALSE'.
    
    See Also:
    
    Constant Field Values
  - FETCH
```
static final java.lang.String FETCH
```
    A constant for 'FETCH'.
    
    See Also:
    
    Constant Field Values
  - FIRST
```
static final java.lang.String FIRST
```
    The constant for 'FIRST'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - FROM
```
static final java.lang.String FROM
```
    The constant for 'FROM'.
    
    See Also:
    
    Constant Field Values
  - FUNC
```
static final java.lang.String FUNC
```
    The constant 'FUNC', which is an EclipseLink specific identifier that was added in version 2.1.
    
    See Also:
    
    Constant Field Values
  - FUNCTION
```
static final java.lang.String FUNCTION
```
    The constant 'FUNCTION', part of JPA 2.1.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - GREATER_THAN
```
static final java.lang.String GREATER_THAN
```
    The constant for '>'.
    
    See Also:
    
    Constant Field Values
  - GREATER_THAN_OR_EQUAL
```
static final java.lang.String GREATER_THAN_OR_EQUAL
```
    The constant for '>='.
    
    See Also:
    
    Constant Field Values
  - GROUP_BY
```
static final java.lang.String GROUP_BY
```
    The constant for 'GROUP BY'.
    
    See Also:
    
    Constant Field Values
  - HAVING
```
static final java.lang.String HAVING
```
    The constant for 'HAVING'.
    
    See Also:
    
    Constant Field Values
  - IN
```
static final java.lang.String IN
```
    The constant for 'IN'.
    
    See Also:
    
    Constant Field Values
  - INDEX
```
static final java.lang.String INDEX
```
    The constant for 'INDEX'.
    
    See Also:
    
    Constant Field Values
  - INNER
```
static final java.lang.String INNER
```
    The constant for 'INNER'.
    
    See Also:
    
    Constant Field Values
  - INNER_JOIN
```
static final java.lang.String INNER_JOIN
```
    The constant for 'INNER JOIN'.
    
    See Also:
    
    Constant Field Values
  - INNER_JOIN_FETCH
```
static final java.lang.String INNER_JOIN_FETCH
```
    The constant for 'INNER JOIN FETCH'.
    
    See Also:
    
    Constant Field Values
  - INTERSECT
```
static final java.lang.String INTERSECT
```
    The constant for 'INTERSECT'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - IS
```
static final java.lang.String IS
```
    The constant for 'IS'.
    
    See Also:
    
    Constant Field Values
  - IS_EMPTY
```
static final java.lang.String IS_EMPTY
```
    The constant for 'IS EMPTY'.
    
    See Also:
    
    Constant Field Values
  - IS_NOT_EMPTY
```
static final java.lang.String IS_NOT_EMPTY
```
    The constant for 'IS NOT EMPTY'.
    
    See Also:
    
    Constant Field Values
  - IS_NOT_NULL
```
static final java.lang.String IS_NOT_NULL
```
    The constant for 'IS NOT NULL'.
    
    See Also:
    
    Constant Field Values
  - IS_NULL
```
static final java.lang.String IS_NULL
```
    The constant for 'IS NULL'.
    
    See Also:
    
    Constant Field Values
  - JOIN
```
static final java.lang.String JOIN
```
    The constant for 'JOIN'.
    
    See Also:
    
    Constant Field Values
  - JOIN_FETCH
```
static final java.lang.String JOIN_FETCH
```
    The constant for 'JOIN FETCH'.
    
    See Also:
    
    Constant Field Values
  - KEY
```
static final java.lang.String KEY
```
    The constant for 'KEY'.
    
    See Also:
    
    Constant Field Values
  - LAST
```
static final java.lang.String LAST
```
    The constant for 'LAST'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - LEADING
```
static final java.lang.String LEADING
```
    The constant for 'LEADING'.
    
    See Also:
    
    Constant Field Values
  - LEFT
```
static final java.lang.String LEFT
```
    The constant for 'LEFT'.
    
    See Also:
    
    Constant Field Values
  - LEFT_JOIN
```
static final java.lang.String LEFT_JOIN
```
    The constant for 'LEFT JOIN'.
    
    See Also:
    
    Constant Field Values
  - LEFT_JOIN_FETCH
```
static final java.lang.String LEFT_JOIN_FETCH
```
    The constant for 'LEFT JOIN FETCH'.
    
    See Also:
    
    Constant Field Values
  - LEFT_OUTER_JOIN
```
static final java.lang.String LEFT_OUTER_JOIN
```
    The constant for 'LEFT OUTER JOIN'.
    
    See Also:
    
    Constant Field Values
  - LEFT_OUTER_JOIN_FETCH
```
static final java.lang.String LEFT_OUTER_JOIN_FETCH
```
    The constant for 'LEFT OUTER JOIN FETCH'.
    
    See Also:
    
    Constant Field Values
  - LENGTH
```
static final java.lang.String LENGTH
```
    The constant for 'LENGTH'.
    
    See Also:
    
    Constant Field Values
  - LIKE
```
static final java.lang.String LIKE
```
    The constant for 'LIKE'.
    
    See Also:
    
    Constant Field Values
  - LOCATE
```
static final java.lang.String LOCATE
```
    The constant for 'LOCATE'.
    
    See Also:
    
    Constant Field Values
  - LOWER
```
static final java.lang.String LOWER
```
    The constant for 'LOWER'.
    
    See Also:
    
    Constant Field Values
  - LOWER_THAN
```
static final java.lang.String LOWER_THAN
```
    The constant for '<'.
    
    See Also:
    
    Constant Field Values
  - LOWER_THAN_OR_EQUAL
```
static final java.lang.String LOWER_THAN_OR_EQUAL
```
    The constant for '<='.
    
    See Also:
    
    Constant Field Values
  - MAX
```
static final java.lang.String MAX
```
    The constant for 'MAX'.
    
    See Also:
    
    Constant Field Values
  - MEMBER
```
static final java.lang.String MEMBER
```
    The constant for 'MEMBER'.
    
    See Also:
    
    Constant Field Values
  - MEMBER_OF
```
static final java.lang.String MEMBER_OF
```
    The constant for 'MEMBER OF'.
    
    See Also:
    
    Constant Field Values
  - MIN
```
static final java.lang.String MIN
```
    The constant for 'MIN'.
    
    See Also:
    
    Constant Field Values
  - MINUS
```
static final java.lang.String MINUS
```
    The constant for the minus sign '-'.
    
    See Also:
    
    Constant Field Values
  - MOD
```
static final java.lang.String MOD
```
    The constant for 'MOD'.
    
    See Also:
    
    Constant Field Values
  - MULTIPLICATION
```
static final java.lang.String MULTIPLICATION
```
    The constant for multiplication sign '*'.
    
    See Also:
    
    Constant Field Values
  - NAMED_PARAMETER
```
static final java.lang.String NAMED_PARAMETER
```
    The constant for ':'.
    
    See Also:
    
    Constant Field Values
  - NEW
```
static final java.lang.String NEW
```
    The constant for 'NEW'.
    
    See Also:
    
    Constant Field Values
  - NOT
```
static final java.lang.String NOT
```
    The constant for 'NOT'.
    
    See Also:
    
    Constant Field Values
  - NOT_BETWEEN
```
static final java.lang.String NOT_BETWEEN
```
    The constant for 'NOT BETWEEN'.
    
    See Also:
    
    Constant Field Values
  - NOT_EQUAL
```
static final java.lang.String NOT_EQUAL
```
    The constant for '!='.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - NOT_EXISTS
```
static final java.lang.String NOT_EXISTS
```
    The constant for 'NOT EXISTS'.
    
    See Also:
    
    Constant Field Values
  - NOT_IN
```
static final java.lang.String NOT_IN
```
    The constant for 'NOT IN'.
    
    See Also:
    
    Constant Field Values
  - NOT_LIKE
```
static final java.lang.String NOT_LIKE
```
    The constant for 'NOT LIKE'.
    
    See Also:
    
    Constant Field Values
  - NOT_MEMBER
```
static final java.lang.String NOT_MEMBER
```
    The constant for 'NOT MEMBER'.
    
    See Also:
    
    Constant Field Values
  - NOT_MEMBER_OF
```
static final java.lang.String NOT_MEMBER_OF
```
    The constant for 'NOT MEMBER OF'.
    
    See Also:
    
    Constant Field Values
  - NULL
```
static final java.lang.String NULL
```
    The constant for 'NULL'.
    
    See Also:
    
    Constant Field Values
  - NULLIF
```
static final java.lang.String NULLIF
```
    The constant for 'NULLIF'.
    
    See Also:
    
    Constant Field Values
  - NULLS
```
static final java.lang.String NULLS
```
    The constant for 'NULLS'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - NULLS_FIRST
```
static final java.lang.String NULLS_FIRST
```
    The constant for 'NULLS FIRST'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - NULLS_LAST
```
static final java.lang.String NULLS_LAST
```
    The constant for 'NULLS LAST'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - OBJECT
```
static final java.lang.String OBJECT
```
    The constant for 'OBJECT'.
    
    See Also:
    
    Constant Field Values
  - OF
```
static final java.lang.String OF
```
    The constant for 'OF'.
    
    See Also:
    
    Constant Field Values
  - ON
```
static final java.lang.String ON
```
    The constant for 'ON', which is an EclipseLink specific identifier that was added in version 2.4.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - OPERATOR
```
static final java.lang.String OPERATOR
```
    The constant 'OPERATOR', which is an EclipseLink specific identifier that was added in version 2.4.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - OR
```
static final java.lang.String OR
```
    The constant for 'OR'.
    
    See Also:
    
    Constant Field Values
  - ORDER_BY
```
static final java.lang.String ORDER_BY
```
    The constant for 'ORDER BY'.
    
    See Also:
    
    Constant Field Values
  - ORDER_SIBLINGS_BY
```
static final java.lang.String ORDER_SIBLINGS_BY
```
    The constant for 'ORDER SIBLINGS BY'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - OUTER
```
static final java.lang.String OUTER
```
    The constant for 'OUTER'.
    
    See Also:
    
    Constant Field Values
  - PLUS
```
static final java.lang.String PLUS
```
    The constant for for the plus sign '+'.
    
    See Also:
    
    Constant Field Values
  - POSITION
```
static final java.lang.String POSITION
```
    The constant for 'POSITION', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - POSITIONAL_PARAMETER
```
static final java.lang.String POSITIONAL_PARAMETER
```
    The constant for '?'.
    
    See Also:
    
    Constant Field Values
  - QUOTE
```
static final java.lang.String QUOTE
```
    The constant for single quote.
    
    See Also:
    
    Constant Field Values
  - REGEXP
```
static final java.lang.String REGEXP
```
    The constant for 'REGEXP'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - SCN
```
static final java.lang.String SCN
```
    The constant for 'SCN'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - SELECT
```
static final java.lang.String SELECT
```
    The constant for 'SELECT'.
    
    See Also:
    
    Constant Field Values
  - SET
```
static final java.lang.String SET
```
    The constant for 'SET'.
    
    See Also:
    
    Constant Field Values
  - SIZE
```
static final java.lang.String SIZE
```
    The constant for 'SIZE'.
    
    See Also:
    
    Constant Field Values
  - SOME
```
static final java.lang.String SOME
```
    The constant for 'SOME'.
    
    See Also:
    
    Constant Field Values
  - SQL
```
static final java.lang.String SQL
```
    The constant 'SQL', which is an EclipseLink specific identifier that was added in version 2.4.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - SQRT
```
static final java.lang.String SQRT
```
    The constant for 'SQRT'.
    
    See Also:
    
    Constant Field Values
  - START_WITH
```
static final java.lang.String START_WITH
```
    The constant for 'WHERE'.
    
    See Also:
    
    Constant Field Values
  - SUBSTRING
```
static final java.lang.String SUBSTRING
```
    The constant for 'SUBSTRING'.
    
    See Also:
    
    Constant Field Values
  - SUM
```
static final java.lang.String SUM
```
    The constant for 'SUM'.
    
    See Also:
    
    Constant Field Values
  - TABLE
```
static final java.lang.String TABLE
```
    The constant for 'TABLE'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - THEN
```
static final java.lang.String THEN
```
    The constant for 'THEN'.
    
    See Also:
    
    Constant Field Values
  - TIMESTAMP
```
static final java.lang.String TIMESTAMP
```
    The constant for 'TIMESTAMP'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.5
  - TRAILING
```
static final java.lang.String TRAILING
```
    The constant for 'TRAILING'.
    
    See Also:
    
    Constant Field Values
  - TREAT
```
static final java.lang.String TREAT
```
    The constant for 'TREAT', which is an EclipseLink specific identifier that was added in version 2.1.
    
    See Also:
    
    Constant Field Values
  - TRIM
```
static final java.lang.String TRIM
```
    The constant for 'TRIM'.
    
    See Also:
    
    Constant Field Values
  - TRUE
```
static final java.lang.String TRUE
```
    The constant for 'TRUE'.
    
    See Also:
    
    Constant Field Values
  - TYPE
```
static final java.lang.String TYPE
```
    The constant for 'TYPE'.
    
    See Also:
    
    Constant Field Values
  - UNION
```
static final java.lang.String UNION
```
    The constant for 'UNION'.
    
    See Also:
    
    Constant Field Values
    
    Since:
    
    2.4
  - UNKNOWN
```
static final java.lang.String UNKNOWN
```
    The constant for 'UNKNOWN', which is an unused keyword.
    
    See Also:
    
    Constant Field Values
  - UPDATE
```
static final java.lang.String UPDATE
```
    The constant for 'UPDATE'.
    
    See Also:
    
    Constant Field Values
  - UPPER
```
static final java.lang.String UPPER
```
    The constant for 'UPPER'.
    
    See Also:
    
    Constant Field Values
  - VALUE
```
static final java.lang.String VALUE
```
    The constant for 'VALUE'.
    
    See Also:
    
    Constant Field Values
  - WHEN
```
static final java.lang.String WHEN
```
    The constant for the identifier 'WHEN'.
    
    See Also:
    
    Constant Field Values
  - WHERE
```
static final java.lang.String WHERE
```
    The constant for 'WHERE'.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - accept
```
void accept(ExpressionVisitor visitor)
```
    Visits this Expression by the given visitor.
    
    Parameters:
    
    visitor - The ExpressionVisitor to visit this object
  - acceptChildren
```
void acceptChildren(ExpressionVisitor visitor)
```
    Visits the children of this Expression. This method can be used to optimize traversing the children since a new list is not created every time children() is called.
    This does not traverse the Expression sub-hierarchy, use a subclass of AbstractTraverseChildrenVisitor in order to traverse the entire sub-hierarchy.
    
    Parameters:
    
    visitor - The visitor to visit the children of this object.
  - children
```
ListIterable<Expression> children()
```
    Returns the children of this Expression.
    
    Returns:
    
    The children of this Expression or an empty ListIterable
  - findQueryBNF
```
JPQLQueryBNF findQueryBNF(Expression expression)
```
    Retrieves the JPQLQueryBNF that represents the fragment of this Expression that was used when parsing the given Expression.
    
    Parameters:
    
    expression - The Expression that is a descendant of this one
    
    Returns:
    
    The JPQLQueryBNF that was used to parse the given expression
    
    Since:
    
    2.5
  - getGrammar
```
JPQLGrammar getGrammar()
```
    Returns the JPQLGrammar that defines how the JPQL query was parsed.
    
    Returns:
    
    The JPQLGrammar that was used to parse this Expression
    
    Since:
    
    2.4
  - getLength
```
int getLength()
```
    Returns the length of the string representation of this Expression, which is the length of the text generated by toActualText().
    
    Returns:
    
    The length of the string representation of this Expression
    
    Since:
    
    2.4
  - getOffset
```
int getOffset()
```
    Returns the position of this Expression within its parent hierarchy.
    
    Returns:
    
    The length of the string representation of what is coming before this object
    
    Since:
    
    2.4
  - getParent
```
Expression getParent()
```
    Returns the parent of this Expression.
    
    Returns:
    
    The parent of this Expression, which is never null except for the root of the tree
  - getQueryBNF
```
JPQLQueryBNF getQueryBNF()
```
    Returns the BNF of this Expression.
    
    Returns:
    
    The JPQLQueryBNF, which represents the grammar of this Expression
    
    Since:
    
    2.4
  - getRoot
```
JPQLExpression getRoot()
```
    Retrieves the root node of the parsed tree hierarchy.
    
    Returns:
    
    The root of the Expression tree
  - isAncestor
```
boolean isAncestor(Expression expression)
```
    Determines whether this Expression is a parent of the given Expression.
    
    Parameters:
    
    expression - The Expression to verify its paternity with this Expression
    
    Returns:
    
    true if this Expression is the same as the given Expression or one of its parent; false otherwise
  - orderedChildren
```
ListIterable<Expression> orderedChildren()
```
    Returns the list representing this Expression and its children.
    
    Returns:
    
    The Expressions representing this Expression
  - populatePosition
```
void populatePosition(QueryPosition queryPosition,
                      int position)
```
    Retrieves the Expression located at the given position using the actual query, which may have extra whitespace.
    
    Parameters:
    
    position - The array has one element and is the position of the Expression to retrieve
  - toActualText
```
java.lang.String toActualText()
```
    Generates a string representation of this Expression, which needs to include any characters that are considered virtual, i.e. that was parsed when the query is incomplete and is needed for functionality like content assist.
    
    Returns:
    
    The string representation of this Expression
  - toParsedText
```
java.lang.String toParsedText()
```
    Returns a string representation of this Expression and its children. The expression should contain whitespace even if the beautified version would not have any. For instance, "SELECT e " should be returned where toParsedText() would return "SELECT e".
    
    Returns:
    
    The string representation of this Expression

Interface Expression

Field Summary

Method Summary

Field Detail

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