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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 <vespa/vespalib/util/memory.h>
#include <vespa/vespalib/stllike/string.h>
#include <cstdint>
namespace document {
/**
* \class document::IdString
* \ingroup base
*
* \brief Scheme for document id.
*
* Document id with a scheme that both supports uniform hash based distribution,
* and location based distribution based on numeric id or textual group..
*/
class IdString {
public:
using LocationType = uint64_t;
static LocationType makeLocation(vespalib::stringref s);
explicit IdString(vespalib::stringref ns);
IdString();
[[nodiscard]] vespalib::stringref getNamespace() const { return getComponent(0); }
[[nodiscard]] bool hasDocType() const { return size(1) != 0; }
[[nodiscard]] vespalib::stringref getDocType() const { return getComponent(1); }
[[nodiscard]] LocationType getLocation() const { return _location; }
[[nodiscard]] bool hasNumber() const { return _has_number; }
[[nodiscard]] uint64_t getNumber() const { return _location; }
[[nodiscard]] bool hasGroup() const { return _groupOffset != 0; }
[[nodiscard]] vespalib::stringref getGroup() const {
return {getRawId().c_str() + _groupOffset, size_t(offset(3) - _groupOffset - 1)};
}
[[nodiscard]] vespalib::stringref getNamespaceSpecific() const {
return {_rawId.c_str() + offset(3), _rawId.size() - offset(3)};
}
bool operator==(const IdString& other) const
{ return toString() == other.toString(); }
[[nodiscard]] const vespalib::string & toString() const { return _rawId; }
private:
[[nodiscard]] uint16_t offset(uint32_t index) const { return _offsets[index]; }
[[nodiscard]] uint16_t size(uint32_t index) const { return std::max(0, int(offset(index+1)) - int(offset(index)) - 1); }
[[nodiscard]] vespalib::stringref getComponent(size_t index) const { return {_rawId.c_str() + offset(index), size(index)}; }
[[nodiscard]] const vespalib::string & getRawId() const { return _rawId; }
class Offsets {
public:
Offsets() noexcept = default;
VESPA_DLL_LOCAL uint16_t compute(vespalib::stringref id);
uint16_t operator [] (size_t i) const { return _offsets[i]; }
static const Offsets DefaultID;
private:
static constexpr uint32_t MAX_COMPONENTS = 4;
VESPA_DLL_LOCAL explicit Offsets(vespalib::stringref id) noexcept;
uint16_t _offsets[MAX_COMPONENTS];
};
vespalib::string _rawId;
LocationType _location;
Offsets _offsets;
uint16_t _groupOffset;
bool _has_number;
};
} // document
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