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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 "streamed_value.h"
#include <vespa/eval/eval/value_builder_factory.h>
#include <vespa/vespalib/util/shared_string_repo.h>
namespace vespalib::eval {
/**
* Builder for StreamedValue objects.
**/
template <typename T>
class StreamedValueBuilder : public ValueBuilder<T>
{
private:
using Handles = SharedStringRepo::Handles;
ValueType _type;
size_t _num_mapped_dimensions;
size_t _dense_subspace_size;
std::vector<T> _cells;
size_t _num_subspaces;
Handles _labels;
public:
StreamedValueBuilder(const ValueType &type,
size_t num_mapped_in,
size_t subspace_size_in,
size_t expected_subspaces)
: _type(type),
_num_mapped_dimensions(num_mapped_in),
_dense_subspace_size(subspace_size_in),
_cells(),
_num_subspaces(0),
_labels()
{
_cells.reserve(subspace_size_in * expected_subspaces);
_labels.reserve(num_mapped_in * expected_subspaces);
};
~StreamedValueBuilder();
ArrayRef<T> add_subspace(ConstArrayRef<vespalib::stringref> addr) override {
for (auto label : addr) {
_labels.add(label);
}
size_t old_sz = _cells.size();
_cells.resize(old_sz + _dense_subspace_size);
_num_subspaces++;
return ArrayRef<T>(&_cells[old_sz], _dense_subspace_size);
}
ArrayRef<T> add_subspace(ConstArrayRef<string_id> addr) override {
for (auto label : addr) {
_labels.push_back(label);
}
size_t old_sz = _cells.size();
_cells.resize(old_sz + _dense_subspace_size);
_num_subspaces++;
return ArrayRef<T>(&_cells[old_sz], _dense_subspace_size);
}
std::unique_ptr<Value> build(std::unique_ptr<ValueBuilder<T>>) override {
if (_num_mapped_dimensions == 0) {
assert(_num_subspaces == 1);
}
assert(_num_subspaces * _dense_subspace_size == _cells.size());
return std::make_unique<StreamedValue<T>>(std::move(_type),
_num_mapped_dimensions,
std::move(_cells),
_num_subspaces,
std::move(_labels));
}
};
} // namespace
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