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Refactor HyperLogLogPlusPlus to separate algorithms and internal data…
… representation (#60104) (#60109)
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...main/java/org/elasticsearch/search/aggregations/metrics/AbstractCardinalityAlgorithm.java
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/* | ||
* Licensed to Elasticsearch under one or more contributor | ||
* license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright | ||
* ownership. Elasticsearch 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. | ||
*/ | ||
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package org.elasticsearch.search.aggregations.metrics; | ||
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/** | ||
* Base class for cardinality related algorithms. | ||
*/ | ||
abstract class AbstractCardinalityAlgorithm { | ||
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public static final int MIN_PRECISION = 4; | ||
public static final int MAX_PRECISION = 18; | ||
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protected final int p; | ||
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AbstractCardinalityAlgorithm(int precision) { | ||
if (precision < MIN_PRECISION) { | ||
throw new IllegalArgumentException("precision must be >= 4"); | ||
} | ||
if (precision > MAX_PRECISION) { | ||
throw new IllegalArgumentException("precision must be <= 18"); | ||
} | ||
p = precision; | ||
} | ||
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/** Precision of the algorithm */ | ||
public int precision() { | ||
return p; | ||
} | ||
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/** Returns the current computed cardinality */ | ||
public abstract long cardinality(); | ||
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static long linearCounting(long m, long v) { | ||
return Math.round(m * Math.log((double) m / v)); | ||
} | ||
} |
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