org.apache.openjpa.persistence.query

Class UnaryExpressionPredicate

java.lang.Object

org.apache.openjpa.persistence.query.AbstractVisitable

org.apache.openjpa.persistence.query.UnaryExpressionPredicate

All Implemented Interfaces:

Serializable, Predicate, Visitable

Direct Known Subclasses:

ExistsExpression, IsEmptyExpression, IsNullExpression

 class UnaryExpressionPredicate
extends AbstractVisitable
implements Predicate, Visitable

Unary Predicate results from an operator on an Expression.

Author:

Pinaki Poddar

Field Summary

Fields

Modifier and Type	Field and Description
protected Expression	_e
protected UnaryConditionalOperator	_op

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

CLOSE_BRACE, COMMA, EMPTY, OPEN_BRACE, SPACE

Constructor Summary

Constructors

Constructor and Description
UnaryExpressionPredicate(Expression e, UnaryConditionalOperator op, UnaryConditionalOperator nop)

Method Summary

Methods

Modifier and Type	Method and Description
Predicate	and(Predicate predicate) Creates an AND of the predicate with the argument.
String	asExpression(AliasContext ctx) Get a JPQL fragment as used in WHERE clause.
Expression	getOperand()
UnaryConditionalOperator	getOperator()
Predicate	not() Creates a negation of the predicate with the argument.
Predicate	or(Predicate predicate) Creates an OR of the predicate with the argument.

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

Field Detail

_e

protected final Expression _e

_op

protected final UnaryConditionalOperator _op

Constructor Detail

UnaryExpressionPredicate

public UnaryExpressionPredicate(Expression e,
                        UnaryConditionalOperator op,
                        UnaryConditionalOperator nop)

Method Detail

getOperand

public Expression getOperand()

getOperator

public UnaryConditionalOperator getOperator()

and

public Predicate and(Predicate predicate)

Description copied from interface: Predicate

Creates an AND of the predicate with the argument.

Specified by:

and in interface Predicate

Parameters:

predicate - - A simple or compound predicate

Returns:

the predicate that is the AND of the original simple or compound predicate and the argument.

or

public Predicate or(Predicate predicate)

Description copied from interface: Predicate

Creates an OR of the predicate with the argument.

Specified by:

or in interface Predicate

Parameters:

predicate - - A simple or compound predicate

Returns:

the predicate that is the OR of the original simple or compound predicate and the argument.

not

public Predicate not()

Description copied from interface: Predicate

Creates a negation of the predicate with the argument.

Specified by:

not in interface Predicate

Returns:

the predicate that is the negation of the original simple or compound predicate.

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 AbstractVisitable