org.eclipse.persistence.jpa.jpql.parser

Class DateTime

java.lang.Object

org.eclipse.persistence.jpa.jpql.parser.AbstractExpression

org.eclipse.persistence.jpa.jpql.parser.DateTime

All Implemented Interfaces:

Expression

public final class DateTime
extends AbstractExpression

This Expression represents a date or time. It supports the following identifiers:

CURRENT_DATE: This function returns the value of current date on the database server.

CURRENT_TIME: This function returns the value of current time on the database server.

CURRENT_TIMESTAMP: This function returns the value of current timestamp on the database server.

BNF: functions_returning_datetime ::= CURRENT_DATE | CURRENT_TIME | CURRENT_TIMESTAMP

The JDBC escape syntax may be used for the specification of date, time, and timestamp literals.

BNF: expression ::= {d 'yyyy-mm-dd'} | {t 'hh:mm:ss'} | {ts 'yyyy-mm-dd hh:mm:ss.f...'}

Version:

2.4

Author:

Pascal Filion

Since:

2.3

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression

COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE

Fields inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression

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 Summary

Constructors

Constructor and Description
DateTime(AbstractExpression parent) Creates a new DateTime.

Method Summary

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.
protected void	addOrderedChildrenTo(java.util.List<Expression> children) Adds the children of this AbstractExpression to the given list.
java.lang.String	getActualIdentifier() Returns the actual identifier found in the string representation of the JPQL query, which has the actual case that was used.
JPQLQueryBNF	getQueryBNF() Returns the BNF of this Expression.
java.lang.String	getText() Returns the encapsulated text of this AbstractExpression, which can be used in various ways, it can be a keyword, a literal, etc.
boolean	isCurrentDate() Determines whether this DateTime represents the JPQL identifier CURRENT_DATE.
boolean	isCurrentTime() Determines whether this DateTime represents the JPQL identifier CURRENT_TIME.
boolean	isCurrentTimestamp() Determines whether this DateTime represents the JPQL identifier CURRENT_TIMESTAMP.
boolean	isJDBCDate() Determines whether this DateTime represents the JDBC escape syntax for date, time, timestamp formats.
protected void	parse(WordParser wordParser, boolean tolerant) Parses the query by starting at the current position, which is part of the given WordParser.
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.
protected void	toParsedText(java.lang.StringBuilder writer, boolean actual) Generates a string representation of this Expression, including its children, if it has any.

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression

acceptUnknownVisitor, acceptUnknownVisitor, addChildrenTo, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, findQueryBNF, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isParsingComplete, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DateTime

public DateTime(AbstractExpression parent)

Creates a new DateTime.

Parameters:

parent - The parent of this expression

Method Detail

accept

public void accept(ExpressionVisitor visitor)

Visits this Expression by the given visitor.

Parameters:

visitor - The ExpressionVisitor to visit this object

acceptChildren

public 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 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.

Parameters:

visitor - The visitor to visit the children of this object.

addOrderedChildrenTo

protected void addOrderedChildrenTo(java.util.List<Expression> children)

Adds the children of this AbstractExpression to the given list.

Overrides:

addOrderedChildrenTo in class AbstractExpression

Parameters:

children - The list used to store the string representation of this AbstractExpression

getActualIdentifier

public java.lang.String getActualIdentifier()

Returns the actual identifier found in the string representation of the JPQL query, which has the actual case that was used.

Returns:

The identifier that was actually parsed

getQueryBNF

public JPQLQueryBNF getQueryBNF()

Returns the BNF of this Expression.

Returns:

The JPQLQueryBNF, which represents the grammar of this Expression

getText

public java.lang.String getText()

Returns the encapsulated text of this AbstractExpression, which can be used in various ways, it can be a keyword, a literal, etc.

Overrides:

getText in class AbstractExpression

Returns:

Either the JPQL identifier for this AbstractExpression, the literal it encapsulates or an empty string

isCurrentDate

public boolean isCurrentDate()

Determines whether this DateTime represents the JPQL identifier CURRENT_DATE.

Returns:

true if this Expression represents CURRENT_DATE; false otherwise

isCurrentTime

public boolean isCurrentTime()

Determines whether this DateTime represents the JPQL identifier CURRENT_TIME.

Returns:

true if this Expression represents CURRENT_TIME; false otherwise

isCurrentTimestamp

public boolean isCurrentTimestamp()

Determines whether this DateTime represents the JPQL identifier CURRENT_TIMESTAMP.

Returns:

true if this Expression represents CURRENT_TIMESTAMP; false otherwise

isJDBCDate

public boolean isJDBCDate()

Determines whether this DateTime represents the JDBC escape syntax for date, time, timestamp formats.

Returns:

true if this Expression represents a JDBC escape syntax; false otherwise

parse

protected void parse(WordParser wordParser,
                     boolean tolerant)

Parses the query by starting at the current position, which is part of the given WordParser.

Specified by:

parse in class AbstractExpression

Parameters:

wordParser - The text to parse based on the current position of the cursor

tolerant - Determines whether the parsing system should be tolerant, meaning if it should try to parse invalid or incomplete queries

toActualText

public 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.

Specified by:

toActualText in interface Expression

Overrides:

toActualText in class AbstractExpression

Returns:

The string representation of this Expression

toParsedText

public 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 Expression.toParsedText() would return "SELECT e".

Specified by:

toParsedText in interface Expression

Overrides:

toParsedText in class AbstractExpression

Returns:

The string representation of this Expression

toParsedText

protected void toParsedText(java.lang.StringBuilder writer,
                            boolean actual)

Generates a string representation of this Expression, including its children, if it has any.

Specified by:

toParsedText in class AbstractExpression

Parameters:

writer - The buffer used to append this Expression's string representation

actual - Determines whether the string representation should represent what was parsed, i.e. include any "virtual" whitespace (such as ending whitespace) and the actual case of the JPQL identifiers