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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "has_mask_remapper.h"
#include <vespa/vespalib/stllike/hash_map.h>
#include <cassert>
namespace storage {
HasMaskRemapper::HasMaskRemapper(const std::vector<api::MergeBucketCommand::Node> &all_nodes,
const std::vector<api::MergeBucketCommand::Node> &nodes)
: _mask_remap(),
_all_remapped(0u)
{
if (nodes != all_nodes) {
vespalib::hash_map<uint32_t, uint32_t> node_index_to_mask(all_nodes.size());
uint16_t mask = 1u;
for (const auto& node : all_nodes) {
node_index_to_mask[node.index] = mask;
mask <<= 1;
}
_mask_remap.reserve(nodes.size());
for (const auto& node : nodes) {
mask = node_index_to_mask[node.index];
assert(mask != 0u);
_mask_remap.push_back(mask);
_all_remapped |= mask;
}
} else {
_all_remapped = ((1u << all_nodes.size()) - 1);
}
}
HasMaskRemapper::~HasMaskRemapper() = default;
uint16_t
HasMaskRemapper::operator()(uint16_t mask) const
{
if (!_mask_remap.empty()) {
uint16_t new_mask = 0u;
for (uint32_t i = 0u; i < _mask_remap.size(); ++i) {
if ((mask & (1u << i)) != 0u) {
new_mask |= _mask_remap[i];
}
}
mask = new_mask;
} else {
mask &= _all_remapped;
}
return mask;
}
uint16_t
HasMaskRemapper::operator()(uint16_t mask, uint16_t keep_from_full_mask) const
{
return (operator()(mask) | (keep_from_full_mask & ~_all_remapped));
}
}
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