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;
  
  /**
   * Defines reasonable defaults for {@code Data}'s {@code equals()}, {@code hashCode()} and
   * {@code toString()}. They should be default implementations in the {@code Data} interface itself,
   * but Java 8 doesn't allow to override {@code Object}'s methods by default implementations
   * in interfaces.
   */
  public abstract class AbstractData<T> implements Data<T> {
  
      /**
       * Constructor for use by subclasses.
       */
      protected AbstractData() {
      }
  
      /**
       * Computes value's hash code by applying a hash function to {@code Data}'s <i>bytes</i>
       * representation.
       *
       * @implNote delegates to {@link #dataHashCode()}.
       */
      @Override
      public int hashCode() {
          return dataHashCode();
      }
  
      /**
       * Compares {@code Data}s' <i>bytes</i> representations.
       *
       * @implNote delegates to {@link #dataEquals(Object)}.
       */
      @Override
      public boolean equals(Object obj) {
          return dataEquals(obj);
      }
  
      /**
       * Delegates to {@code Data}'s <i>object</i> {@code toString()}. If deserialization fails with
       * exception (e. g. if data bytes are corrupted, and represent not a valid serialized form of
       * an object), traces the data's bytes and the exception.
       *
       * @implNote delegates to {@link #dataToString()}.
       */
      @Override
      public String toString() {
          return dataToString();
      }
  }
  