81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dictionary/utils/bloom_filter.h"
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#include <gtest/gtest.h>
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#include <algorithm>
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#include <cstdlib>
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#include <functional>
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#include <random>
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#include <unordered_set>
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#include <vector>
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namespace latinime {
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namespace {
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TEST(BloomFilterTest, TestFilter) {
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static const int TEST_RANDOM_DATA_MAX = 65536;
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static const int ELEMENT_COUNT = 1000;
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std::vector<int> elements;
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// Initialize data set with random integers.
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{
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// Use the uniform integer distribution [0, TEST_RANDOM_DATA_MAX].
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std::uniform_int_distribution<int> distribution(0, TEST_RANDOM_DATA_MAX);
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auto randomNumberGenerator = std::bind(distribution, std::mt19937());
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for (int i = 0; i < ELEMENT_COUNT; ++i) {
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elements.push_back(randomNumberGenerator());
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}
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}
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// Make sure BloomFilter contains nothing by default.
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BloomFilter bloomFilter;
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for (const int elem : elements) {
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ASSERT_FALSE(bloomFilter.isInFilter(elem));
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}
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// Copy some of the test vector into bloom filter.
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std::unordered_set<int> elementsThatHaveBeenSetInFilter;
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{
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// Use the uniform integer distribution [0, 1].
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std::uniform_int_distribution<int> distribution(0, 1);
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auto randomBitGenerator = std::bind(distribution, std::mt19937());
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for (const int elem : elements) {
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if (randomBitGenerator() == 0) {
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bloomFilter.setInFilter(elem);
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elementsThatHaveBeenSetInFilter.insert(elem);
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}
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}
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}
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for (const int elem : elements) {
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const bool existsInFilter = bloomFilter.isInFilter(elem);
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const bool hasBeenSetInFilter =
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elementsThatHaveBeenSetInFilter.find(elem) != elementsThatHaveBeenSetInFilter.end();
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if (hasBeenSetInFilter) {
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EXPECT_TRUE(existsInFilter) << "elem: " << elem;
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}
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if (!existsInFilter) {
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EXPECT_FALSE(hasBeenSetInFilter) << "elem: " << elem;
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}
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}
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}
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} // namespace
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} // namespace latinime
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