github.com/keysonZZZ/kmg@v0.0.0-20151121023212-05317bfd7d39/kmgRpc/kmgRpcJava/java/src/com/google/gson/JsonNull.java (about)

     1  /*
     2   * Copyright (C) 2008 Google Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package com.google.gson;
    18  
    19  /**
    20   * A class representing a Json {@code null} value.
    21   *
    22   * @author Inderjeet Singh
    23   * @author Joel Leitch
    24   * @since 1.2
    25   */
    26  public final class JsonNull extends JsonElement {
    27    /**
    28     * singleton for JsonNull
    29     *
    30     * @since 1.8
    31     */
    32    public static final JsonNull INSTANCE = new JsonNull();
    33  
    34    /**
    35     * Creates a new JsonNull object.
    36     * Deprecated since Gson version 1.8. Use {@link #INSTANCE} instead
    37     */
    38    @Deprecated
    39    public JsonNull() {
    40      // Do nothing
    41    }
    42  
    43    @Override
    44    JsonNull deepCopy() {
    45      return INSTANCE;
    46    }
    47  
    48    /**
    49     * All instances of JsonNull have the same hash code since they are indistinguishable
    50     */
    51    @Override
    52    public int hashCode() {
    53      return JsonNull.class.hashCode();
    54    }
    55  
    56    /**
    57     * All instances of JsonNull are the same
    58     */
    59    @Override
    60    public boolean equals(Object other) {
    61      return this == other || other instanceof JsonNull;
    62    }
    63  }