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.io.sstable.format;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.EnumSet;
  import java.util.Map;
  
  import com.google.common.collect.ImmutableMap;
  
  import org.apache.cassandra.db.SerializationHeader;
  import org.apache.cassandra.exceptions.UnknownColumnException;
  import org.apache.cassandra.io.FSWriteError;
  import org.apache.cassandra.io.sstable.CorruptSSTableException;
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.io.sstable.format.SSTableFormat.Components;
  import org.apache.cassandra.io.sstable.metadata.CompactionMetadata;
  import org.apache.cassandra.io.sstable.metadata.MetadataComponent;
  import org.apache.cassandra.io.sstable.metadata.MetadataType;
  import org.apache.cassandra.io.sstable.metadata.StatsMetadata;
  import org.apache.cassandra.io.sstable.metadata.ValidationMetadata;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.io.util.SequentialWriter;
  import org.apache.cassandra.io.util.SequentialWriterOption;
  import org.apache.cassandra.schema.TableMetadata;
  
  public class StatsComponent
  {
      public final Map<MetadataType, MetadataComponent> metadata;
  
      public StatsComponent(Map<MetadataType, MetadataComponent> metadata)
      {
          this.metadata = ImmutableMap.copyOf(metadata);
      }
  
      public static StatsComponent load(Descriptor descriptor) throws IOException
      {
          return load(descriptor, MetadataType.values());
      }
  
      public static StatsComponent load(Descriptor descriptor, MetadataType... types) throws IOException
      {
          Map<MetadataType, MetadataComponent> metadata;
          try
          {
              metadata = descriptor.getMetadataSerializer().deserialize(descriptor, EnumSet.copyOf(Arrays.asList(types)));
          }
          catch (IOException e)
          {
              throw new CorruptSSTableException(e, descriptor.fileFor(Components.STATS));
          }
  
          return new StatsComponent(metadata);
      }
  
      public SerializationHeader.Component serializationHeader()
      {
          return (SerializationHeader.Component) metadata.get(MetadataType.HEADER);
      }
  
      public SerializationHeader serializationHeader(TableMetadata metadata)
      {
          SerializationHeader.Component header = serializationHeader();
          if (header != null)
          {
              try
              {
                  return header.toHeader(metadata);
              }
              catch (UnknownColumnException ex)
              {
                  throw new IllegalArgumentException(ex);
              }
          }
  
          return null;
      }
  
      public CompactionMetadata compactionMetadata()
      {
          return (CompactionMetadata) metadata.get(MetadataType.COMPACTION);
      }
  
      public ValidationMetadata validationMetadata()
      {
          return (ValidationMetadata) metadata.get(MetadataType.VALIDATION);
      }
  
      public StatsMetadata statsMetadata()
      {
          return (StatsMetadata) metadata.get(MetadataType.STATS);
      }
  
      public void save(Descriptor desc)
      {
          File file = desc.fileFor(Components.STATS);
          try (SequentialWriter out = new SequentialWriter(file, SequentialWriterOption.DEFAULT))
          {
              desc.getMetadataSerializer().serialize(metadata, out, desc.version);
              out.finish();
          }
          catch (IOException e)
          {
              throw new FSWriteError(e, file.path());
          }
      }
  
  }
  