Class AbstractPathExpression
java.lang.Object
org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractPathExpression
- All Implemented Interfaces:
Expression
- Direct Known Subclasses:
CollectionValuedPathExpression
,StateFieldPathExpression
An identification variable followed by the navigation operator (.) and a state field or
association field is a path expression. The type of the path expression is the type computed as
the result of navigation; that is, the type of the state field or association field to which the
expression navigates.
- Since:
- 2.3
- Version:
- 2.5
- See Also:
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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, CEILING, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DATE, DATETIME, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXP, EXTRACT, FALSE, FETCH, FIRST, FLOOR, 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, LN, LOCAL, 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, POWER, QUOTE, REGEXP, ROUND, SCN, SELECT, SET, SIGN, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIME, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE
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Constructor Summary
ModifierConstructorDescriptionprotected
AbstractPathExpression
(AbstractExpression parent, String paths) Creates a newAbstractPathExpression
.protected
AbstractPathExpression
(AbstractExpression parent, AbstractExpression identificationVariable) Creates a newAbstractPathExpression
.AbstractPathExpression
(AbstractExpression parent, AbstractExpression identificationVariable, String paths) Creates a newAbstractPathExpression
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Method Summary
Modifier and TypeMethodDescriptionvoid
acceptChildren
(ExpressionVisitor visitor) Visits the children of thisExpression
.protected void
addChildrenTo
(Collection<Expression> children) Adds the children of thisAbstractExpression
to the given collection.protected final void
addOrderedChildrenTo
(List<Expression> children) Adds the children of thisAbstractExpression
to the given list.final boolean
Determines whether the path ends with a dot or not.final JPQLQueryBNF
findQueryBNF
(Expression expression) Retrieves theJPQLQueryBNF
that represents the fragment of thisExpression
that was used when parsing the givenExpression
.final Expression
Returns the identification variable that starts the path expression, which can be a sample identification variable, a map value, map key or map entry expression.final String
getPath
(int index) Returns the specified segment of the state field path.final boolean
Determines whether the identification variable was parsed.final boolean
Determines whether the path's identification variable is virtual or not, meaning it's not part of the query but is required for proper navigability.protected final void
parse
(WordParser wordParser, boolean tolerant) Parses the query by starting at the current position, which is part of the givenWordParser
.final ListIterable
<String> paths()
Returns the segments in the state field path in order.final int
pathSize()
Returns the number of segments in the state field path.protected final void
setVirtualIdentificationVariable
(String variableName) Sets a virtual identification variable because the abstract schema name was parsed without one.final boolean
Determines whether the path starts with a dot or not.toParsedText
(int startIndex, int stopIndex) Returns a string representation from the given range.protected final void
toParsedText
(StringBuilder writer, boolean actual) Generates a string representation of thisExpression
, including its children, if it has any.Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
acceptUnknownVisitor, acceptUnknownVisitor, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, getText, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isParsingComplete, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toActualText, toParsedText, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression
accept, getQueryBNF
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Constructor Details
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AbstractPathExpression
protected AbstractPathExpression(AbstractExpression parent, AbstractExpression identificationVariable) Creates a newAbstractPathExpression
.- Parameters:
parent
- The parent of this expressionidentificationVariable
- The identification variable that was already parsed, which means the beginning of the parsing should start with a dot
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AbstractPathExpression
public AbstractPathExpression(AbstractExpression parent, AbstractExpression identificationVariable, String paths) Creates a newAbstractPathExpression
.- Parameters:
parent
- The parent of this expressionidentificationVariable
- The identification variable that was already parsed, which means the beginning of the parsing should start with a dotpaths
- The path expression that is following the identification variable
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AbstractPathExpression
Creates a newAbstractPathExpression
.- Parameters:
parent
- The parent of this expressionpaths
- The path expression
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Method Details
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acceptChildren
Description copied from interface:Expression
Visits the children of thisExpression
. This method can be used to optimize traversing the children since a new list is not created every timeExpression.children()
is called.This does not traverse the
Expression
sub-hierarchy, use a subclass ofAbstractTraverseChildrenVisitor
in order to traverse the entire sub-hierarchy.- Parameters:
visitor
- Thevisitor
to visit the children of this object.
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addChildrenTo
Description copied from class:AbstractExpression
Adds the children of thisAbstractExpression
to the given collection.- Overrides:
addChildrenTo
in classAbstractExpression
- Parameters:
children
- The collection used to store the children
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addOrderedChildrenTo
Description copied from class:AbstractExpression
Adds the children of thisAbstractExpression
to the given list.- Overrides:
addOrderedChildrenTo
in classAbstractExpression
- Parameters:
children
- The list used to store the string representation of thisAbstractExpression
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endsWithDot
public final boolean endsWithDot()Determines whether the path ends with a dot or not.- Returns:
true
if the path ends with a dot;false
otherwise
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findQueryBNF
Description copied from interface:Expression
Retrieves theJPQLQueryBNF
that represents the fragment of thisExpression
that was used when parsing the givenExpression
.- Specified by:
findQueryBNF
in interfaceExpression
- Overrides:
findQueryBNF
in classAbstractExpression
- Parameters:
expression
- TheExpression
that is a descendant of this one- Returns:
- The
JPQLQueryBNF
that was used to parse the given expression
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getIdentificationVariable
Returns the identification variable that starts the path expression, which can be a sample identification variable, a map value, map key or map entry expression.- Returns:
- The root of the path expression
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getPath
Returns the specified segment of the state field path.- Parameters:
index
- The 0-based segment index- Returns:
- The specified segment
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hasIdentificationVariable
public final boolean hasIdentificationVariable()Determines whether the identification variable was parsed.- Returns:
true
the identification variable was parsed;false
otherwise
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hasVirtualIdentificationVariable
public final boolean hasVirtualIdentificationVariable()Determines whether the path's identification variable is virtual or not, meaning it's not part of the query but is required for proper navigability.- Returns:
true
if this identification variable was virtually created to fully qualify path expression;false
if it was parsed
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parse
Description copied from class:AbstractExpression
Parses the query by starting at the current position, which is part of the givenWordParser
.- Specified by:
parse
in classAbstractExpression
- Parameters:
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 queries
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paths
Returns the segments in the state field path in order.- Returns:
- An
Iterator
over the segments of the state field path
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pathSize
public final int pathSize()Returns the number of segments in the state field path.- Returns:
- The number of segments
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setVirtualIdentificationVariable
Sets a virtual identification variable because the abstract schema name was parsed without one. This is valid in an UPDATE and DELETE queries.- Parameters:
variableName
- The identification variable that was generated to identify the "root" object
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startsWithDot
public final boolean startsWithDot()Determines whether the path starts with a dot or not.- Returns:
true
if the path starts with a dot;false
otherwise
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toParsedText
Returns a string representation from the given range.- Parameters:
startIndex
- The beginning of the range to create the string representationstopIndex
- When to stop creating the string representation, which is exclusive- Returns:
- The string representation of this path expression contained in the given range
- Since:
- 2.4
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toParsedText
Description copied from class:AbstractExpression
Generates a string representation of thisExpression
, including its children, if it has any.- Specified by:
toParsedText
in classAbstractExpression
- Parameters:
writer
- The buffer used to append thisExpression
's string representationactual
- 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
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