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.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import javax.annotation.concurrent.NotThreadSafe;
  
  import org.apache.cassandra.index.sai.disk.ResettableByteBuffersIndexOutput;
  import org.apache.lucene.store.IndexOutput;
  import org.apache.lucene.util.BytesRef;
  
  @NotThreadSafe
  public class MetadataWriter implements Closeable
  {
      private final IndexOutput output;
      private final Map<String, BytesRef> map = new HashMap<>();
  
      public MetadataWriter(IndexOutput output)
      {
          this.output = output;
      }
  
      public Builder builder(String name)
      {
          return new Builder(name);
      }
  
      public class Builder extends ResettableByteBuffersIndexOutput implements Closeable
      {
          private Builder(String name)
          {
              super(name);
          }
  
          @Override
          public void close()
          {
              map.put(getName(), new BytesRef(toArrayCopy(), 0, intSize()));
          }
      }
  
      private void finish() throws IOException
      {
          SAICodecUtils.writeHeader(output);
          output.writeInt(map.size());
          for (Map.Entry<String, BytesRef> entry : map.entrySet())
          {
              output.writeString(entry.getKey());
              output.writeInt(entry.getValue().length);
              output.writeBytes(entry.getValue().bytes, entry.getValue().offset, entry.getValue().length);
          }
          SAICodecUtils.writeFooter(output);
      }
  
      @Override
      public void close() throws IOException
      {
          try
          {
              finish();
          }
          finally
          {
              output.close();
          }
      }
  }
  