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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.EmptyCollectionComparisonExpression
public final class EmptyCollectionComparisonExpression
This expression tests whether or not the collection designated by the collection-valued path expression is empty (i.e, has no elements).
empty_collection_comparison_expression ::= collection_valued_path_expression IS [NOT] EMPTY
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.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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EmptyCollectionComparisonExpression(AbstractExpression parent,
AbstractExpression expression)
Creates a new NullComparisonExpression . |
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 . |
protected void |
addChildrenTo(java.util.Collection<Expression> children)
Adds the children of this AbstractExpression to the given collection. |
protected void |
addOrderedChildrenTo(java.util.List<Expression> children)
Adds the children of this AbstractExpression to the given list. |
JPQLQueryBNF |
findQueryBNF(Expression expression)
Retrieves the JPQLQueryBNF that represents the fragment of this Expression
that was used when parsing the given Expression . |
java.lang.String |
getActualEmptyIdentifier()
Returns the actual EMPTY found in the string representation of the JPQL query, which has the actual case that was used. |
java.lang.String |
getActualIsIdentifier()
Returns the actual IS found in the string representation of the JPQL query, which has the actual case that was used. |
java.lang.String |
getActualNotIdentifier()
Returns the actual NOT found in the string representation of the JPQL query, which has the actual case that was used. |
Expression |
getExpression()
Returns the Expression that represents the collection-valued path expression if it was
parsed. |
java.lang.String |
getIdentifier()
Returns the identifier for this expression that may include NOT if it was parsed. |
JPQLQueryBNF |
getQueryBNF()
Returns the BNF of this Expression . |
boolean |
hasExpression()
Determines whether the expression was parsed. |
boolean |
hasNot()
Determines whether the identifier NOT was part of the query. |
boolean |
hasSpaceAfterIs()
Determines whether a whitespace was found after IS. |
protected void |
parse(WordParser wordParser,
boolean tolerant)
Parses the query by starting at the current position, which is part of the given WordParser . |
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 java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public EmptyCollectionComparisonExpression(AbstractExpression parent, AbstractExpression expression)
NullComparisonExpression
.
parent
- The parent of this expressionexpression
- The Expression
that represents the collection-valued path expressionMethod Detail |
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public 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.protected void addChildrenTo(java.util.Collection<Expression> children)
AbstractExpression
to the given collection.
addChildrenTo
in class AbstractExpression
children
- The collection used to store the childrenprotected void addOrderedChildrenTo(java.util.List<Expression> children)
AbstractExpression
to the given list.
addOrderedChildrenTo
in class AbstractExpression
children
- The list used to store the string representation of this AbstractExpression
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 one
JPQLQueryBNF
that was used to parse the given expressionpublic java.lang.String getActualEmptyIdentifier()
public java.lang.String getActualIsIdentifier()
public java.lang.String getActualNotIdentifier()
public Expression getExpression()
Expression
that represents the collection-valued path expression if it was
parsed.
public java.lang.String getIdentifier()
public JPQLQueryBNF getQueryBNF()
Expression
.
JPQLQueryBNF
, which represents the grammar of this Expression
public boolean hasExpression()
true
if the expression was parsed; false
otherwisepublic boolean hasNot()
true
if the identifier NOT was parsed; false
otherwisepublic boolean hasSpaceAfterIs()
true
if there was a whitespace after IS; false
otherwiseprotected void 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 queriesprotected void toParsedText(java.lang.StringBuilder writer, boolean actual)
Expression
, including its children,
if it has any.
toParsedText
in class AbstractExpression
writer
- The buffer used to append this Expression
'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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