/*
 * Copyright 2018, TeamDev. All rights reserved.
 *
 * Redistribution and use in source and/or binary forms, with or without
 * modification, must retain the above copyright notice and the following
 * disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.spine.core;

import com.google.protobuf.Empty;
import io.spine.type.MessageClass;

/**
 * @author Dmytro Dashenkov
 */
public final class EmptyClass extends MessageClass {

    private static final long serialVersionUID = 0L;

    private EmptyClass() {
        super(Empty.class);
    }

    public static EmptyClass instance() {
        return Singleton.INSTANCE.value;
    }

    private enum Singleton {
        INSTANCE;
        @SuppressWarnings("NonSerializableFieldInSerializableClass")
        private final EmptyClass value = new EmptyClass();
    }
}

@@ -1104,16 +1104,61 @@
 s;%0A%0A/**%0A
+ * The class of an %7B@link Empty%7D message.%0A *%0A
  * @auth
@@ -1347,24 +1347,101 @@
 ss);%0A    %7D%0A%0A
+    /**%0A     * @return the single instance of the %7B@code EmptyClass%7D%0A     */%0A
     public s

Add doc for `EmptyClass`.