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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/array.h>
#include <vespa/vespalib/stllike/string.h>
#include <cassert>
namespace search { class BitVector; }
namespace search::diskindex {
using SelectorArray = vespalib::Array<uint8_t>;
class DocIdMapping
{
public:
const SelectorArray *_selector; // External ownership
uint32_t _docIdLimit;
uint8_t _selectorId;
DocIdMapping();
void clear();
void setup(uint32_t docIdLimit);
void setup(uint32_t docIdLimit, const SelectorArray *selector, uint8_t selectorId);
bool readDocIdLimit(const vespalib::string &dir);
};
class DocIdMapper
{
public:
const uint8_t *_selector;
uint32_t _docIdLimit; // Limit on legal input values
uint32_t _selectorLimit; // Limit on output
uint8_t _selectorId;
DocIdMapper()
: _selector(nullptr),
_docIdLimit(0u),
_selectorLimit(0),
_selectorId(0u)
{ }
void setup(const DocIdMapping &mapping) {
_selector = (mapping._selector != nullptr) ? mapping._selector->data() : nullptr;
_docIdLimit = mapping._docIdLimit;
_selectorLimit = (mapping._selector != nullptr) ? mapping._selector->size() : 0u;
_selectorId = mapping._selectorId;
}
static uint32_t noDocId() {
return static_cast<uint32_t>(-1);
}
uint32_t mapDocId(uint32_t docId) const {
assert(docId < _docIdLimit);
if (_selector != nullptr && (docId >= _selectorLimit || _selector[docId] != _selectorId)) {
docId = noDocId();
}
return docId;
}
};
}
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