content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.index.sai.disk.v1;
  
  import java.io.Closeable;
  import java.util.EnumMap;
  import java.util.Map;
  
  import org.apache.cassandra.index.sai.disk.format.IndexComponent;
  import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
  import org.apache.cassandra.index.sai.utils.IndexIdentifier;
  import org.apache.cassandra.index.sai.utils.IndexTermType;
  import org.apache.cassandra.io.util.FileHandle;
  import org.apache.cassandra.io.util.FileUtils;
  
  /**
   * Maintains a mapping of {@link IndexComponent}s to associated {@link FileHandle}s for
   * read operations on the components. Users of this class are returned copies of the
   * {@link FileHandle}s using {@link FileHandle#sharedCopy()} so returned handles still
   * need to be closed by the user.
   */
  public class PerColumnIndexFiles implements Closeable
  {
      private final Map<IndexComponent, FileHandle> files = new EnumMap<>(IndexComponent.class);
      private final IndexDescriptor indexDescriptor;
      private final IndexIdentifier indexIdentifier;
  
      public PerColumnIndexFiles(IndexDescriptor indexDescriptor, IndexTermType indexTermType, IndexIdentifier indexIdentifier)
      {
          this.indexDescriptor = indexDescriptor;
          this.indexIdentifier = indexIdentifier;
          for (IndexComponent component : indexDescriptor.version.onDiskFormat().perColumnIndexComponents(indexTermType))
          {
              if (component == IndexComponent.META || component == IndexComponent.COLUMN_COMPLETION_MARKER)
                  continue;
              files.put(component, indexDescriptor.createPerIndexFileHandle(component, indexIdentifier, this::close));
          }
      }
  
      public FileHandle termsData()
      {
          return getFile(IndexComponent.TERMS_DATA);
      }
  
      public FileHandle postingLists()
      {
          return getFile(IndexComponent.POSTING_LISTS);
      }
  
      public FileHandle balancedTree()
      {
          return getFile(IndexComponent.BALANCED_TREE);
      }
  
      public FileHandle compressedVectors()
      {
          return getFile(IndexComponent.COMPRESSED_VECTORS);
      }
  
      private FileHandle getFile(IndexComponent indexComponent)
      {
          FileHandle file = files.get(indexComponent);
          if (file == null)
              throw new IllegalArgumentException(String.format(indexIdentifier.logMessage("Component %s not found for SSTable %s"),
                                                               indexComponent, indexDescriptor.sstableDescriptor));
  
          return file.sharedCopy();
      }
  
      @Override
      public void close()
      {
          FileUtils.closeQuietly(files.values());
      }
  }
  