code: /*
   * Copyright (C) 2008 Google Inc.
   *
   * 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 tools.com.google.gson;
  
  /**
   * A class representing a Json {@code null} value.
   *
   * @author Inderjeet Singh
   * @author Joel Leitch
   * @since 1.2
   */
  public final class JsonNull extends JsonElement {
    /**
     * singleton for JsonNull
     *
     * @since 1.8
     */
    public static final JsonNull INSTANCE = new JsonNull();
  
    /**
     * Creates a new JsonNull object.
     * Deprecated since Gson version 1.8. Use {@link #INSTANCE} instead
     */
    @Deprecated
    public JsonNull() {
      // Do nothing
    }
  
    /**
     * Returns the same instance since it is an immutable value
     * @since 2.8.2
     */
    @Override
    public JsonNull deepCopy() {
      return INSTANCE;
    }
  
    /**
     * All instances of JsonNull have the same hash code since they are indistinguishable
     */
    @Override
    public int hashCode() {
      return JsonNull.class.hashCode();
    }
  
    /**
     * All instances of JsonNull are the same
     */
    @Override
    public boolean equals(Object other) {
      return this == other || other instanceof JsonNull;
    }
  }
  