org.apache.openjpa.persistence.query
Class IsNullExpression

java.lang.Object
  org.apache.openjpa.persistence.query.AbstractVisitable
      org.apache.openjpa.persistence.query.UnaryExpressionPredicate
          org.apache.openjpa.persistence.query.IsNullExpression

All Implemented Interfaces:

Serializable, Predicate, Visitable

public class IsNullExpression
extends UnaryExpressionPredicate

Denotes e IS NULL Expression.

Author:

Pinaki Poddar

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.openjpa.persistence.query.UnaryExpressionPredicate

_e, _op

Fields inherited from class org.apache.openjpa.persistence.query.AbstractVisitable

CLOSE_BRACE, COMMA, EMPTY, OPEN_BRACE, SPACE

Constructor Summary

IsNullExpression(Expression op)

Method Summary

String

asExpression(AliasContext ctx) Get a JPQL fragment as used in WHERE clause.

Methods inherited from class org.apache.openjpa.persistence.query.UnaryExpressionPredicate

and, getOperand, getOperator, not, or

Methods inherited from class org.apache.openjpa.persistence.query.AbstractVisitable

asJoinable, asProjection, getAliasHint

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.openjpa.persistence.query.Visitable

asJoinable, asProjection, getAliasHint

Constructor Detail

IsNullExpression

public IsNullExpression(Expression op)

Method Detail

asExpression

public String asExpression(AliasContext ctx)

Description copied from interface: Visitable

Get a JPQL fragment as used in WHERE clause.

Specified by:

asExpression in interface Visitable

Overrides:

asExpression in class UnaryExpressionPredicate