| /* |
| * 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 |
| @SuppressWarnings("resource") |
| public BloomFilter deserialize(DataInputStreamPlus in) throws IOException |
| { |
| int hashes = in.readInt(); |
| IBitSet bs = OffHeapBitSet.deserialize(in, oldFormat); |
| |
| return new BloomFilter(hashes, bs); |
| } |
| } |