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/*
 * This file is part of WebLookAndFeel library.
 *
 * WebLookAndFeel library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * WebLookAndFeel library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with WebLookAndFeel library.  If not, see .
 */

package com.alee.api.merge;

import com.alee.api.annotations.NotNull;
import com.alee.api.annotations.Nullable;

import java.io.Serializable;

/**
 * Object merge {@code null} case resolver.
 * It is asked to choose one of the specified objects.
 *
 * @author Mikle Garin
 * @see How to use Merge
 * @see Merge
 */
public interface NullResolver extends Serializable
{
    /**
     * Returns one of the specified objects.
     * One of the passed objects will always be {@code null}.
     *
     * @param merge  {@link RecursiveMerge} algorithm
     * @param object base object
     * @param merged object to merge
     * @return either {@code object} or {@code merged} object
     */
    @Nullable
    public Object resolve ( @NotNull RecursiveMerge merge, @Nullable Object object, @Nullable Object merged );
}