/*
* 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.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.cassandra.db.TypeSizes;
import org.apache.cassandra.io.ISerializer;
import org.apache.cassandra.utils.obs.IBitSet;
import org.apache.cassandra.utils.obs.OffHeapBitSet;
import org.apache.cassandra.utils.obs.OpenBitSet;
abstract class BloomFilterSerializer implements ISerializer<BloomFilter>
{
public void serialize(BloomFilter bf, DataOutput dos) throws IOException
{
dos.writeInt(bf.hashCount);
bf.bitset.serialize(dos);
}
public BloomFilter deserialize(DataInput dis) throws IOException
{
return deserialize(dis, false);
}
public BloomFilter deserialize(DataInput dis, boolean offheap) throws IOException
{
int hashes = dis.readInt();
IBitSet bs = offheap ? OffHeapBitSet.deserialize(dis) : OpenBitSet.deserialize(dis);
return createFilter(hashes, bs);
}
protected abstract BloomFilter createFilter(int hashes, IBitSet bs);
/**
* Calculates a serialized size of the given Bloom Filter
* @see BloomFilterSerializer#serialize(BloomFilter, DataOutput)
*
* @param bf Bloom filter to calculate serialized size
*
* @return serialized size of the given bloom filter
*/
public long serializedSize(BloomFilter bf, TypeSizes typeSizes)
{
int size = typeSizes.sizeof(bf.hashCount); // hash count
size += bf.bitset.serializedSize(typeSizes);
return size;
}
}