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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.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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private AbstractExpression |
expression The expression tested for being null or not. |
private boolean |
hasNot Determines whether 'NOT' is present in the query or not. |
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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NullComparisonExpression(AbstractExpression parent, AbstractExpression expression) Creates a new NullComparisonExpression . |
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NullComparisonExpression(AbstractExpression parent, java.lang.String identifier, 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 . |
(package private) void |
addChildrenTo(java.util.Collection<Expression> children) Adds the children of this Expression to the given collection. |
(package private) void |
addOrderedChildrenTo(java.util.List<StringExpression> children) Adds the StringExpressions representing this Expression . |
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. |
(package private) void |
parse(WordParser wordParser, boolean tolerant) Parses the query by starting at the current position, which is part of the given WordParser . |
(package private) void |
toParsedText(java.lang.StringBuilder writer, boolean includeVirtual) Generates a string representation of this Expression . |
private void |
updateExpression(AbstractExpression expression) |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression |
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buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, children, expressionFactory, expressionFactoryForIdentifier, findQueryBNF, getChildren, getJPAVersion, getParent, getRoot, getText, 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, toParsedText, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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private AbstractExpression expression
null
or not.private boolean hasNot
Constructor Detail |
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NullComparisonExpression(AbstractExpression parent, AbstractExpression expression)
NullComparisonExpression
.
parent
- The parent of this expressionexpression
- The expression before the identifierNullComparisonExpression(AbstractExpression parent, java.lang.String identifier, AbstractExpression expression)
NullComparisonExpression
.
parent
- The parent of this expressionexpression
- The expression before the identifierMethod 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 addChildrenTo(java.util.Collection<Expression> children)
Expression
to the given collection.addChildrenTo
in class AbstractExpression
children
- The collection used to store the childrenvoid 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 Expression getExpression()
null
.null
-expressionpublic java.lang.String getIdentifier()
public JPQLQueryBNF getQueryBNF()
Expression
.getQueryBNF
in class AbstractExpression
JPQLQueryBNF
, which represents the grammar of this Expression
public boolean hasExpression()
true
the expression preceding the identifier was parsed; false
otherwisepublic boolean hasNot()
true
if NOT is present in the query; 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 queriesvoid 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 assistprivate void updateExpression(AbstractExpression expression)
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