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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <unordered_set>
#include <string>
/**
* Simple host filter which in its default empty state implicitly includes all
* hosts, or only an explicit subset iff at least one host has been provided
* to the filter as part of construction.
*/
class HostFilter {
public:
using HostSet = std::unordered_set<std::string>;
private:
HostSet _hosts;
public:
/**
* Empty host filter; all hosts are implicitly included.
*/
HostFilter() : _hosts() {}
/**
* Explicitly given host set; only the hosts whose name exactly match
* one of the provided names will pass the includes(name) check.
*/
explicit HostFilter(const std::unordered_set<std::string>& hosts)
: _hosts(hosts)
{
}
explicit HostFilter(std::unordered_set<std::string>&& hosts)
: _hosts(std::move(hosts))
{
}
HostFilter(HostFilter&&) = default;
HostFilter& operator=(HostFilter&&) = default;
HostFilter(const HostFilter&) = default;
HostFilter& operator=(const HostFilter&) = default;
bool includes(const std::string& candidate) const {
if (_hosts.empty()) {
return true;
}
return (_hosts.find(candidate) != _hosts.end());
}
};
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