code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * 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 net.openhft.chronicle.hash.impl.util;
  
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import java.util.Arrays;
  
  /**
   * java.util.Objects since Java 7
   */
  public final class Objects {
      private Objects() {
      }
  
      public static int hash(Object... values) {
          return Arrays.hashCode(values);
      }
  
      public static boolean equal(@Nullable Object a, @Nullable Object b) {
          return a != null ? a.equals(b) : b == null;
      }
  
      public static boolean builderEquals(@NotNull Object builder, @Nullable Object o) {
          return builder == o ||
                  o != null && builder.getClass() == o.getClass() &&
                          builder.toString().equals(o.toString());
      }
  
      public static void requireNonNull(Object obj) {
          if (obj == null)
              throw new NullPointerException();
      }
  }
  