org.apache.openjpa.persistence.query
Class IsEmptyExpression

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

All Implemented Interfaces:

Serializable, Predicate, Visitable

public class IsEmptyExpression
extends UnaryExpressionPredicate

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

IsEmptyExpression(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

IsEmptyExpression

public IsEmptyExpression(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