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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.NullComparisonExpression
public final class NullComparisonExpression
A null comparison tests whether or not the single-valued path expression or input parameter is a NULL value.
null_comparison_expression ::= {single_valued_path_expression | input_parameter} IS [NOT] NULL
| 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 | |
|---|---|
NullComparisonExpression(AbstractExpression parent,
java.lang.String identifier,
AbstractExpression expression)
Creates a new NullComparisonExpression. |
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| Method Summary | |
|---|---|
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 |
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. |
java.lang.String |
getActualNullIdentifier()
Returns the actual NULL found in the string representation of the JPQL query, which has the actual case that was used. |
Expression |
getExpression()
Returns the expression being tested for being null. |
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 preceding the identifier was parsed. |
boolean |
hasNot()
Determines whether NOT is used in the query. |
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 |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public NullComparisonExpression(AbstractExpression parent, java.lang.String identifier, AbstractExpression expression)
NullComparisonExpression.
parent - The parent of this expressionexpression - The expression before the identifier| Method Detail |
|---|
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 AbstractExpressionchildren - The collection used to store the childrenprotected void addOrderedChildrenTo(java.util.List<Expression> children)
AbstractExpression to the given list.
addOrderedChildrenTo in class AbstractExpressionchildren - The list used to store the string representation of this AbstractExpressionpublic JPQLQueryBNF findQueryBNF(Expression expression)
JPQLQueryBNF that represents the fragment of this Expression
that was used when parsing the given Expression.
findQueryBNF in interface ExpressionfindQueryBNF in class AbstractExpressionexpression - The Expression that is a descendant of this one
JPQLQueryBNF that was used to parse the given expressionpublic java.lang.String getActualIsIdentifier()
public java.lang.String getActualNotIdentifier()
public java.lang.String getActualNullIdentifier()
public Expression getExpression()
null.
null-expressionpublic java.lang.String getIdentifier()
public JPQLQueryBNF getQueryBNF()
Expression.
JPQLQueryBNF, which represents the grammar of this Expressionpublic boolean hasExpression()
true the expression preceding the identifier was parsed;
false otherwisepublic boolean hasNot()
true if NOT is present in the query; false otherwiseprotected void parse(WordParser wordParser, boolean tolerant)
WordParser.
parse in class AbstractExpressionwordParser - 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
protected void toParsedText(java.lang.StringBuilder writer,
boolean actual)
Expression, including its children,
if it has any.
toParsedText in class AbstractExpressionwriter - 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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