content: /*
   * 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 io.airlift.compress.v3.zstd;
  
  class HuffmanCompressionContext
  {
      private final HuffmanTableWriterWorkspace tableWriterWorkspace = new HuffmanTableWriterWorkspace();
      private final HuffmanCompressionTableWorkspace compressionTableWorkspace = new HuffmanCompressionTableWorkspace();
  
      private HuffmanCompressionTable previousTable = new HuffmanCompressionTable(Huffman.MAX_SYMBOL_COUNT);
      private HuffmanCompressionTable temporaryTable = new HuffmanCompressionTable(Huffman.MAX_SYMBOL_COUNT);
  
      private HuffmanCompressionTable previousCandidate = previousTable;
      private HuffmanCompressionTable temporaryCandidate = temporaryTable;
  
      public HuffmanCompressionTable getPreviousTable()
      {
          return previousTable;
      }
  
      public HuffmanCompressionTable borrowTemporaryTable()
      {
          previousCandidate = temporaryTable;
          temporaryCandidate = previousTable;
  
          return temporaryTable;
      }
  
      public void discardTemporaryTable()
      {
          previousCandidate = previousTable;
          temporaryCandidate = temporaryTable;
      }
  
      public void saveChanges()
      {
          temporaryTable = temporaryCandidate;
          previousTable = previousCandidate;
      }
  
      public HuffmanCompressionTableWorkspace getCompressionTableWorkspace()
      {
          return compressionTableWorkspace;
      }
  
      public HuffmanTableWriterWorkspace getTableWriterWorkspace()
      {
          return tableWriterWorkspace;
      }
  }
  