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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "document_features_store_saver.h"
#include <vespa/searchlib/util/bufferwriter.h>
#include <vespa/vespalib/objects/nbo.h>
using vespalib::datastore::EntryRef;
using search::BufferWriter;
namespace search::predicate {
DocumentFeaturesStoreSaver::DocumentFeaturesStoreSaver(const DocumentFeaturesStore& store)
: _refs(store._refs),
_features(store._features),
_ranges(store._ranges),
_word_store(store._word_store),
_arity(store._arity)
{
}
DocumentFeaturesStoreSaver::~DocumentFeaturesStoreSaver() = default;
namespace {
template <typename T>
void nbo_write(BufferWriter& writer, T value)
{
auto value_nbo = vespalib::nbo::n2h(value);
writer.write(&value_nbo, sizeof(value_nbo));
}
template <typename RefsVector, typename RangesStore>
void
find_used_words(const RefsVector& refs, const RangesStore& ranges,
std::unordered_map<uint32_t, uint32_t>& word_map,
std::vector<EntryRef>& word_list)
{
for (auto& cur_refs : refs) {
auto ranges_ref = cur_refs._ranges;
if (ranges_ref.valid()) {
auto range_vector = ranges.get(ranges_ref);
for (const auto& range : range_vector) {
if (!word_map.count(range.label_ref.ref())) {
word_map[range.label_ref.ref()] = word_list.size();
word_list.push_back(range.label_ref);
}
}
}
}
}
void
serialize_words(BufferWriter& writer, const std::vector<EntryRef>& word_list,
const memoryindex::WordStore& word_store)
{
nbo_write<uint32_t>(writer, word_list.size());;
for (const auto &word_ref : word_list) {
const char *word = word_store.getWord(word_ref);
uint32_t len = strlen(word);
nbo_write(writer, len);
writer.write(word, len);
}
}
template <typename RefsVector, typename RangesStore>
void
serialize_ranges(BufferWriter& writer, const RefsVector& refs, const RangesStore& ranges,
std::unordered_map<uint32_t, uint32_t>& word_map)
{
uint32_t ranges_size = 0;
if (!refs.empty()) {
assert(!refs.front()._ranges.valid());
for (auto& cur_refs : refs) {
if (cur_refs._ranges.valid()) {
++ranges_size;
}
}
}
nbo_write(writer, ranges_size);
for (uint32_t doc_id = 0; doc_id < refs.size(); ++doc_id) {
auto ranges_ref = refs[doc_id]._ranges;
if (ranges_ref.valid()) {
nbo_write(writer, doc_id);
auto range_vector = ranges.get(ranges_ref);
nbo_write<uint32_t>(writer, range_vector.size());
for (const auto &range : range_vector) {
nbo_write(writer, word_map[range.label_ref.ref()]);
nbo_write(writer, range.from);
nbo_write(writer, range.to);
}
}
}
}
template <typename RefsVector, typename FeaturesStore>
void
serialize_features(BufferWriter& writer, const RefsVector& refs, const FeaturesStore& features)
{
uint32_t features_size = 0;
if (!refs.empty()) {
assert(!refs.front()._features.valid());
for (auto& cur_refs : refs) {
if (cur_refs._features.valid()) {
++features_size;
}
}
}
nbo_write(writer, features_size);
for (uint32_t doc_id = 0; doc_id < refs.size(); ++doc_id) {
auto features_ref = refs[doc_id]._features;
if (features_ref.valid()) {
nbo_write(writer, doc_id);
auto feature_vector = features.get(features_ref);
nbo_write<uint32_t>(writer, feature_vector.size());
for (const auto &feature : feature_vector) {
nbo_write(writer, feature);
}
}
}
}
} // namespace
void
DocumentFeaturesStoreSaver::save(BufferWriter& writer) const
{
std::vector<EntryRef> word_list;
std::unordered_map<uint32_t, uint32_t> word_map;
find_used_words(_refs, _ranges, word_map, word_list);
nbo_write<uint16_t>(writer, _arity);
serialize_words(writer, word_list, _word_store);
serialize_ranges(writer, _refs, _ranges, word_map);
serialize_features(writer, _refs, _features);
}
}
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