org.apache.openjpa.persistence.criteria
Class Expressions.IsNull

java.lang.Object
  extended by org.apache.openjpa.persistence.criteria.SelectionImpl<X>
      extended by org.apache.openjpa.persistence.criteria.ExpressionImpl<Boolean>
          extended by org.apache.openjpa.persistence.criteria.PredicateImpl
              extended by org.apache.openjpa.persistence.criteria.Expressions.IsNull
All Implemented Interfaces:
Expression<Boolean>, Predicate, Selection<Boolean>, TupleElement<Boolean>, CriteriaExpression
Enclosing class:
Expressions

public static class Expressions.IsNull
extends PredicateImpl


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl
PredicateImpl.And, PredicateImpl.Or
 
Nested classes/interfaces inherited from interface javax.persistence.criteria.Predicate
Predicate.BooleanOperator
 
Field Summary
(package private)  ExpressionImpl<?> e
           
 
Fields inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl
_exps, FALSE, TRUE
 
Constructor Summary
Expressions.IsNull(ExpressionImpl<?> e)
           
 
Method Summary
 void acceptVisit(CriteriaExpressionVisitor visitor)
          Accept visit from the given visitor.
 StringBuilder asValue(AliasContext q)
          Get a string representation of this node as a value in the context of the given query.
 PredicateImpl not()
          Returns a new predicate as the negation of this predicate.
(package private)  Expression toKernelExpression(ExpressionFactory factory, CriteriaQueryImpl<?> q)
          Bridge contract to convert this facade expression to a kernel expression.
 
Methods inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl
add, getExpressions, getOperator, isEmpty, isNegated, markNegated, toValue
 
Methods inherited from class org.apache.openjpa.persistence.criteria.ExpressionImpl
as, in, in, in, in, isNotNull, isNull
 
Methods inherited from class org.apache.openjpa.persistence.criteria.SelectionImpl
alias, asProjection, assertValidName, asVariable, getAlias, getCompoundSelectionItems, getJavaType, isAliased, isAutoAliased, isCompoundSelection, setAutoAlias
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface javax.persistence.criteria.Expression
as, in, in, in, in, isNotNull, isNull
 
Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection
 
Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType
 

Field Detail

e

final ExpressionImpl<?> e
Constructor Detail

Expressions.IsNull

public Expressions.IsNull(ExpressionImpl<?> e)
Method Detail

not

public PredicateImpl not()
Description copied from class: PredicateImpl
Returns a new predicate as the negation of this predicate.
Note: Default negation creates a Not expression with this receiver as delegate. Derived predicates can return the inverse expression, if exists. For example, NotEqual for Equal or LessThan for GreaterThanEqual etc.

Specified by:
not in interface Predicate
Overrides:
not in class PredicateImpl

toKernelExpression

Expression toKernelExpression(ExpressionFactory factory,
                              CriteriaQueryImpl<?> q)
Description copied from class: ExpressionImpl
Bridge contract to convert this facade expression to a kernel expression.

Overrides:
toKernelExpression in class PredicateImpl
Parameters:
factory - creates the kernel expression
q - the query definition context of this expression
Returns:
an equivalent kernel expression

acceptVisit

public void acceptVisit(CriteriaExpressionVisitor visitor)
Description copied from interface: CriteriaExpression
Accept visit from the given visitor. The receiver is responsible to propagate the visitor to the constituent sub-nodes if any.

Specified by:
acceptVisit in interface CriteriaExpression
Overrides:
acceptVisit in class PredicateImpl
Parameters:
visitor - a processor to walk the nodes of a tree.

asValue

public StringBuilder asValue(AliasContext q)
Description copied from interface: CriteriaExpression
Get a string representation of this node as a value in the context of the given query.

Specified by:
asValue in interface CriteriaExpression
Overrides:
asValue in class PredicateImpl


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