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.stage.data.bytes;
  
  import net.openhft.chronicle.bytes.BytesStore;
  import net.openhft.chronicle.bytes.RandomDataInput;
  import net.openhft.chronicle.bytes.VanillaBytes;
  import net.openhft.chronicle.hash.AbstractData;
  import net.openhft.chronicle.hash.impl.stage.hash.CheckOnEachPublicOperation;
  import net.openhft.chronicle.hash.impl.stage.hash.KeyBytesInterop;
  import net.openhft.sg.Stage;
  import net.openhft.sg.StageRef;
  import net.openhft.sg.Staged;
  
  import static net.openhft.chronicle.bytes.NoBytesStore.NO_BYTES_STORE;
  
  @Staged
  public class InputKeyBytesData<K> extends AbstractData<K> {
  
      @Stage("InputKeyBytes")
      private final VanillaBytes inputKeyBytes = VanillaBytes.vanillaBytes();;
      @StageRef
      KeyBytesInterop<K> ki;
      @StageRef
      CheckOnEachPublicOperation checkOnEachPublicOperation;
      @Stage("InputKeyBytesStore")
      private BytesStore inputKeyBytesStore = null;
      @Stage("InputKeyBytesStore")
      private long inputKeyBytesOffset;
      @Stage("InputKeyBytesStore")
      private long inputKeyBytesSize;
      @Stage("InputKeyBytes")
      private boolean inputKeyBytesUsed = false;
      @Stage("CachedInputKey")
      private K cachedInputKey;
      @Stage("CachedInputKey")
      private boolean cachedInputKeyRead = false;
  
      public void initInputKeyBytesStore(BytesStore bytesStore, long offset, long size) {
          inputKeyBytesStore = bytesStore;
          inputKeyBytesOffset = offset;
          inputKeyBytesSize = size;
      }
  
      boolean inputKeyBytesInit() {
          return inputKeyBytesUsed;
      }
  
      void initInputKeyBytes() {
          inputKeyBytes.bytesStore(inputKeyBytesStore, inputKeyBytesOffset, inputKeyBytesSize);
          inputKeyBytesUsed = true;
      }
  
      void closeInputKeyBytes() {
          inputKeyBytes.bytesStore(NO_BYTES_STORE, 0, 0);
          inputKeyBytesUsed = false;
      }
  
      private void initCachedInputKey() {
          cachedInputKey = innerGetUsing(cachedInputKey);
          cachedInputKeyRead = true;
      }
  
      @Override
      public RandomDataInput bytes() {
          checkOnEachPublicOperation.checkOnEachPublicOperation();
          return inputKeyBytes.bytesStore();
      }
  
      @Override
      public long offset() {
          checkOnEachPublicOperation.checkOnEachPublicOperation();
          return inputKeyBytesOffset;
      }
  
      @Override
      public long size() {
          checkOnEachPublicOperation.checkOnEachPublicOperation();
          return inputKeyBytesSize;
      }
  
      @Override
      public K get() {
          checkOnEachPublicOperation.checkOnEachPublicOperation();
          return cachedInputKey;
      }
  
      @Override
      public K getUsing(K using) {
          checkOnEachPublicOperation.checkOnEachPublicOperation();
          return innerGetUsing(using);
      }
  
      private K innerGetUsing(K usingKey) {
          inputKeyBytes.readPosition(inputKeyBytesOffset);
          return ki.keyReader.read(inputKeyBytes, inputKeyBytesSize, usingKey);
      }
  }
  