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.io.util.DataOutputStreamPlus;
  import org.apache.cassandra.utils.concurrent.SharedCloseable;
  
  public interface IFilter extends SharedCloseable
  {
      interface FilterKey
      {
          /**
           * Places the murmur3 hash of the key in the given long array of size at least two.
           */
          void filterHash(long[] dest);
  
          default short filterHashLowerBits()
          {
              long[] dest = new long[2];
              filterHash(dest);
              return (short) dest[1];
          }
      }
  
      void add(FilterKey key);
  
      boolean isPresent(FilterKey key);
  
      void clear();
  
      long serializedSize(boolean oldSerializationFormat);
  
      void serialize(DataOutputStreamPlus out, boolean oldSerializationFormat) throws IOException;
  
      void close();
  
      IFilter sharedCopy();
  
      /**
       * Returns the amount of memory in bytes used off heap.
       *
       * @return the amount of memory in bytes used off heap
       */
      long offHeapSize();
  
      boolean isInformative();
  }
  