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.utils;
  
  import java.io.IOException;
  
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.io.IGenericSerializer;
  import org.apache.cassandra.io.util.DataInputPlus.DataInputStreamPlus;
  import org.apache.cassandra.io.util.DataOutputStreamPlus;
  import org.apache.cassandra.utils.obs.IBitSet;
  import org.apache.cassandra.utils.obs.OffHeapBitSet;
  
  public final class BloomFilterSerializer implements IGenericSerializer<BloomFilter, DataInputStreamPlus, DataOutputStreamPlus>
  {
      public final static BloomFilterSerializer newFormatInstance = new BloomFilterSerializer(false);
      public final static BloomFilterSerializer oldFormatInstance = new BloomFilterSerializer(true);
  
      private final boolean oldFormat;
  
      private <T> BloomFilterSerializer(boolean oldFormat)
      {
          this.oldFormat = oldFormat;
      }
  
      public static BloomFilterSerializer forVersion(boolean oldSerializationFormat)
      {
          if (oldSerializationFormat)
              return oldFormatInstance;
  
          return newFormatInstance;
      }
  
      @Override
      public void serialize(BloomFilter bf, DataOutputStreamPlus out) throws IOException
      {
          assert !oldFormat : "Filter should not be serialized in old format";
          out.writeInt(bf.hashCount);
          bf.bitset.serialize(out);
      }
  
      /**
       * Calculates a serialized size of the given Bloom Filter
       *
       * @param bf Bloom filter to calculate serialized size
       * @return serialized size of the given bloom filter
       * @see org.apache.cassandra.io.ISerializer#serialize(Object, org.apache.cassandra.io.util.DataOutputPlus)
       */
      @Override
      public long serializedSize(BloomFilter bf)
      {
          int size = TypeSizes.sizeof(bf.hashCount); // hash count
          size += bf.bitset.serializedSize();
          return size;
      }
  
      @Override
      public BloomFilter deserialize(DataInputStreamPlus in) throws IOException
      {
          int hashes = in.readInt();
          IBitSet bs = OffHeapBitSet.deserialize(in, oldFormat);
  
          return new BloomFilter(hashes, bs);
      }
  }
  