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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) E28847-01 |
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java.lang.Object
org.eclipse.persistence.jpa.internal.jpql.parser.StringExpression
org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.internal.jpql.parser.DateTime
public final class DateTime
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.
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.
expression ::= {d 'yyyy-mm-dd'} | {t 'hh:mm:ss'} | {ts 'yyyy-mm-dd hh:mm:ss.f...'}
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression |
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COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE |
Constructor Summary | |
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DateTime(AbstractExpression parent) Creates a new DateTime . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor) Visits this Expression by the given visitor . |
void |
acceptChildren(ExpressionVisitor visitor) Visits the children of this Expression . |
(package private) void |
addOrderedChildrenTo(java.util.List<StringExpression> children) Adds the StringExpressions representing this Expression . |
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. |
(package private) void |
parse(WordParser wordParser, boolean tolerant) Parses the query by starting at the current position, which is part of the given WordParser . |
private java.lang.String |
parseIdentifier(WordParser wordParser) |
private void |
parseJDBCEscapeFormat(WordParser wordParser) |
java.lang.String |
toParsedText() Returns a string representation of this StringExpression and its children. |
(package private) void |
toParsedText(java.lang.StringBuilder writer, boolean includeVirtual) Generates a string representation of this Expression . |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression |
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addChildrenTo, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, children, expressionFactory, expressionFactoryForIdentifier, findQueryBNF, getChildren, getJPAVersion, getParent, getRoot, handleAggregate, identifierRole, identifiers, identifiers, identifierVersion, isAncestor, isIdentifier, isNull, isParsingComplete, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseSingleExpression, populatePosition, queryBNF, readdLeadingSpaces, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toActualText, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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DateTime(AbstractExpression parent)
DateTime
.
parent
- The parent of this expressionMethod Detail |
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public void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.visitor
- The visitor
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()
or Expression.getChildren()
is called.
This does not traverse the Expression
sub-hierarchy, use an subclass of AbstractTraverseChildrenVisitor
in order to traverse the entire sub-hierarchy.
visitor
- The visitor
to visit the children of this object.void addOrderedChildrenTo(java.util.List<StringExpression> children)
StringExpressions
representing this Expression
.addOrderedChildrenTo
in class AbstractExpression
children
- The list used to store the string representation of this Expression
public JPQLQueryBNF getQueryBNF()
Expression
.getQueryBNF
in class AbstractExpression
JPQLQueryBNF
, which represents the grammar of this Expression
public java.lang.String getText()
AbstractExpression
, which can be used in various ways, it can be a keyword, a literal, etc.getText
in class AbstractExpression
public boolean isCurrentDate()
DateTime
represents the JPQL identifier CURRENT_DATE
.true
if this Expression
represents CURRENT_DATE
; false
otherwisepublic boolean isCurrentTime()
DateTime
represents the JPQL identifier CURRENT_TIME
.true
if this Expression
represents CURRENT_TIME
; false
otherwisepublic boolean isCurrentTimestamp()
DateTime
represents the JPQL identifier CURRENT_TIMESTAMP
.true
if this Expression
represents CURRENT_TIMESTAMP
; false
otherwisepublic boolean isJDBCDate()
DateTime
represents the JDBC escape syntax for date, time, timestamp formats.true
if this Expression
represents a JDBC escape syntax; false
otherwisevoid parse(WordParser wordParser, boolean tolerant)
WordParser
.parse
in class AbstractExpression
wordParser
- The text to parse based on the current position of the cursortolerant
- Determines whether the parsing system should be tolerant, meaning if it should try to parse invalid or incomplete queriesprivate java.lang.String parseIdentifier(WordParser wordParser)
private void parseJDBCEscapeFormat(WordParser wordParser)
public java.lang.String toParsedText()
StringExpression
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#toText()
would return "SELECT e".toParsedText
in interface Expression
toParsedText
in class AbstractExpression
StringExpression
void toParsedText(java.lang.StringBuilder writer, boolean includeVirtual)
Expression
.toParsedText
in class AbstractExpression
writer
- The buffer used to append this Expression
's string representationincludeVirtual
- Determines whether 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
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