com.speedment.runtime.field.trait.HasReferenceOperators Maven / Gradle / Ivy

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Partly generated model of the fields that represent columns in the database. Fields can be used to produce special predicates and functions that contain metadata that Speedment can analyze runtime.

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/**
 *
 * Copyright (c) 2006-2017, Speedment, Inc. All Rights Reserved.
 *
 * Licensed 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:
 *
 * http://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 com.speedment.runtime.field.trait;

import java.util.function.Predicate;

/**
 *
 * @param   the entity type
 * 
 * @author  Emil Forslund
 * @since   3.0.0
 */
public interface HasReferenceOperators {
    
    /**
     * Returns a {@link java.util.function.Predicate} that will evaluate to
     * {@code true}, if and only if this Field is {@code null}.
     *
     * @return a Predicate that will evaluate to {@code true}, if and only if
     * this Field is {@code null}
     */
    Predicate isNull();

    /**
     * Returns a {@link java.util.function.Predicate} that will evaluate to
     * {@code true}, if and only if this Field is not {@code null}.
     *
     * @return a Predicate that will evaluate to {@code true}, if and only if
     * this Field is not {@code null}
     */
    default Predicate isNotNull() {
        return isNull().negate();
    }
}