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/*
 *
 * Copyright (c) 2006-2019, 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.compute.trait;

import com.speedment.runtime.compute.ToDouble;
import com.speedment.runtime.compute.ToDoubleNullable;

/**
 * Trait for nullable expressions that can be mapped to a new expression of the
 * same type by supplying a mapping function. If the value is present in the
 * original expression, then it will be present in the new one as well. If the
 * result of the original expression is {@code null}, then the new expression
 * will evaluate to {@code null} also.
 *
 * @param        the input entity type
 * @param   the functional interface used for mapping values
 *
 * @author Emil Forslund
 * @since  3.1.0
 */
public interface HasMapToDoubleIfPresent {

    /**
     * Maps the result of this expression into a {@code double} by passing it to
     * the specified {@code mapper}, producing a new expression that implements
     * {@link ToDouble}. If this expression would have evaluated to
     * {@code null}, then the new expression will as well.
     *
     * @param mapper  the mapper to use on the result of this expression
     * @return        the new mapped expression
     */
    ToDoubleNullable mapToDoubleIfPresent(MAPPER mapper);

}




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