api/src/main/java/javax/jdo/query/OptionalExpression.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package javax.jdo.query;

/** Representation of an Optional type in a query. */
public interface OptionalExpression<T> extends ComparableExpression<java.util.Optional<T>> {
  /**
   * Accessor for the object within the Optional.
   *
   * @return Expression for the object
   */
  Expression<T> get();

  /**
   * Accessor for whether there is an object within the Optional.
   *
   * @return Whether there is an expression
   */
  BooleanExpression isPresent();
}