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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/rand48.h>
#include <vespa/vespalib/stllike/string.h>
#include <vector>
#include <cassert>
namespace search {
class RandomGenerator
{
private:
vespalib::Rand48 _rnd;
public:
RandomGenerator() : _rnd() {}
RandomGenerator(long seed) : _rnd() {
_rnd.srand48(seed);
}
void srand(long seed) {
_rnd.srand48(seed);
}
uint32_t rand(uint32_t min, uint32_t max) {
assert(min <= max);
uint32_t divider = max - min + 1;
return (divider == 0 ? _rnd.lrand48() : min + _rnd.lrand48() % divider);
}
vespalib::string getRandomString(uint32_t minLen, uint32_t maxLen) {
uint32_t len = rand(minLen, maxLen);
vespalib::string retval;
for (uint32_t i = 0; i < len; ++i) {
char c = static_cast<char>(rand('a', 'z'));
retval.push_back(c);
}
return retval;
}
void fillRandomStrings(std::vector<vespalib::string> & vec, uint32_t numStrings,
uint32_t minLen, uint32_t maxLen) {
vec.clear();
vec.reserve(numStrings);
for (uint32_t i = 0; i < numStrings; ++i) {
vec.push_back(getRandomString(minLen, maxLen));
}
}
template <typename T>
void fillRandomIntegers(std::vector<T> & vec, uint32_t numValues) {
vec.clear();
vec.reserve(numValues);
for (uint32_t i = 0; i < numValues; ++i) {
vec.push_back(static_cast<T>(_rnd.lrand48()));
}
}
};
} // search
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