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;
  
  import net.openhft.chronicle.map.MapAbsentEntry;
  import net.openhft.chronicle.set.SetAbsentEntry;
  import org.jetbrains.annotations.NotNull;
  
  /**
   * Low-level operational context for the situations, when the new entry is going to be inserted
   * into the {@link ChronicleHash}.
   * <p>
   * <p>This interface is not usable by itself; it merely defines the common base for {@link
   * MapAbsentEntry} and {@link SetAbsentEntry}.
   *
   * @param <K> the hash key type
   * @see HashQueryContext#absentEntry()
   */
  public interface HashAbsentEntry<K> {
  
      /**
       * Returns the context, in which the entry is going to be inserted into the hash.
       */
      HashContext<K> context();
  
      /**
       * Returns the key is going to be inserted into the {@code ChronicleHash}.
       */
      @NotNull
      Data<K> absentKey();
  }
  