/*
* Copyright 2011 The Apache Software Foundation
*
* 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.hadoop.hbase.util;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.io.RawComparator;
public class CompoundBloomFilterBase implements BloomFilterBase {
/**
* At read time, the total number of chunks. At write time, the number of
* chunks created so far. The first chunk has an ID of 0, and the current
* chunk has the ID of numChunks - 1.
*/
protected int numChunks;
/**
* The Bloom filter version. There used to be a DynamicByteBloomFilter which
* had version 2.
*/
public static final int VERSION = 3;
/** Target error rate for configuring the filter and for information */
protected float errorRate;
/** The total number of keys in all chunks */
protected long totalKeyCount;
protected long totalByteSize;
protected long totalMaxKeys;
/** Hash function type to use, as defined in {@link Hash} */
protected int hashType;
/** Comparator used to compare Bloom filter keys */
protected RawComparator<byte[]> comparator;
@Override
public long getMaxKeys() {
return totalMaxKeys;
}
@Override
public long getKeyCount() {
return totalKeyCount;
}
@Override
public long getByteSize() {
return totalByteSize;
}
private static final byte[] DUMMY = new byte[0];
/**
* Prepare an ordered pair of row and qualifier to be compared using
* KeyValue.KeyComparator. This is only used for row-column Bloom
* filters.
*/
@Override
public byte[] createBloomKey(byte[] row, int roffset, int rlength,
byte[] qualifier, int qoffset, int qlength) {
if (qualifier == null)
qualifier = DUMMY;
// Make sure this does not specify a timestamp so that the default maximum
// (most recent) timestamp is used.
KeyValue kv = KeyValue.createFirstOnRow(row, roffset, rlength, DUMMY, 0, 0,
qualifier, qoffset, qlength);
return kv.getKey();
}
@Override
public RawComparator<byte[]> getComparator() {
return comparator;
}
}