javax.persistence.criteria.Expression Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of hibernate-jpa-2.0-api Show documentation

Hibernate definition of the Java Persistence 2.0 (JSR 317) API.

There is a newer version: 1.0.1.Final

Show newest version

// $Id: Expression.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence.criteria;

import java.util.Collection;

/**
 * Type for query expressions.
 *
 * @param  the type of the expression
 * @since Java Persistence 2.0
 */
public interface Expression extends Selection {
	/**
	 * Create a predicate to test whether the expression is null.
	 *
	 * @return predicate testing whether the expression is null
	 */
	Predicate isNull();

	/**
	 * Create a predicate to test whether the expression is
	 * not null.
	 *
	 * @return predicate testing whether the expression is not null
	 */
	Predicate isNotNull();

	/**
	 * Create a predicate to test whether the expression is a member
	 * of the argument list.
	 *
	 * @param values values to be tested against
	 *
	 * @return predicate testing for membership
	 */
	Predicate in(Object... values);

	/**
	 * Create a predicate to test whether the expression is a member
	 * of the argument list.
	 *
	 * @param values expressions to be tested against
	 *
	 * @return predicate testing for membership
	 */
	Predicate in(Expression... values);

	/**
	 * Create a predicate to test whether the expression is a member
	 * of the collection.
	 *
	 * @param values collection of values to be tested against
	 *
	 * @return predicate testing for membership
	 */
	Predicate in(Collection values);

	/**
	 * Create a predicate to test whether the expression is a member
	 * of the collection.
	 *
	 * @param values expression corresponding to collection to be
	 * tested against
	 *
	 * @return predicate testing for membership
	 */
	Predicate in(Expression> values);

	/**
	 * Perform a typecast upon the expression, returning a new
	 * expression object.
	 * This method does not cause type conversion:
	 * the runtime type is not changed.
	 * Warning: may result in a runtime failure.
	 *
	 * @param type intended type of the expression
	 *
	 * @return new expression of the given type
	 */
	 Expression as(Class type);
}