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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "value_builder_factory.h"
namespace vespalib::eval {
namespace {
struct CopyValue {
template <typename CT>
static std::unique_ptr<Value> invoke(const Value &value,
const ValueType &type,
const ValueBuilderFactory &factory)
{
size_t num_mapped = type.count_mapped_dimensions();
size_t dense_size = type.dense_subspace_size();
const auto & idx = value.index();
auto input_cells = value.cells().typify<CT>();
auto builder = factory.create_value_builder<CT>(type, num_mapped, dense_size, idx.size());
std::vector<string_id> addr(num_mapped);
if (num_mapped == 0) {
assert(idx.size() == 1);
auto array_ref = builder->add_subspace(addr);
for (size_t i = 0; i < dense_size; ++i) {
array_ref[i] = input_cells[i];
}
} else {
auto view = idx.create_view({});
view->lookup({});
std::vector<string_id*> addr_fetch;
addr_fetch.reserve(num_mapped);
for (auto & label : addr) {
addr_fetch.push_back(&label);
}
size_t subspace_idx;
while (view->next_result(addr_fetch, subspace_idx)) {
auto array_ref = builder->add_subspace(addr);
for (size_t i = 0; i < dense_size; ++i) {
array_ref[i] = input_cells[(dense_size * subspace_idx) + i];
}
}
}
return builder->build(std::move(builder));
}
};
} // namespace <unnamed>
std::unique_ptr<Value>
ValueBuilderFactory::copy(const Value &value) const
{
const auto & type = value.type();
return typify_invoke<1,TypifyCellType,CopyValue>(type.cell_type(),
value, type, *this);
}
}
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