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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "attribute_field_writer.h"
#include "docsum_field_writer_state.h"
#include "struct_fields_resolver.h"
#include "struct_map_attribute_combiner_dfw.h"
#include <vespa/searchcommon/attribute/iattributecontext.h>
#include <vespa/searchcommon/attribute/iattributevector.h>
#include <vespa/searchlib/common/matching_elements.h>
#include <vespa/searchlib/common/matching_elements_fields.h>
#include <vespa/vespalib/data/slime/cursor.h>
#include <vespa/vespalib/data/slime/inserter.h>
#include <vespa/vespalib/util/stash.h>
#include <algorithm>
#include <cassert>
using search::attribute::IAttributeContext;
using search::attribute::IAttributeVector;
using vespalib::slime::Cursor;
namespace search::docsummary {
namespace {
vespalib::Memory keyName("key");
vespalib::Memory valueName("value");
class StructMapAttributeFieldWriterState : public DocsumFieldWriterState
{
// AttributeFieldWriter instance is owned by stash passed to constructor
AttributeFieldWriter* _keyWriter;
// AttributeFieldWriter instances are owned by stash passed to constructor
std::vector<AttributeFieldWriter*> _valueWriters;
const vespalib::string& _field_name;
const MatchingElements* const _matching_elements;
public:
StructMapAttributeFieldWriterState(const vespalib::string &keyAttributeName,
const std::vector<vespalib::string> &valueFieldNames,
const std::vector<vespalib::string> &valueAttributeNames,
IAttributeContext &context,
vespalib::Stash& stash,
const vespalib::string &field_name,
const MatchingElements* matching_elements);
~StructMapAttributeFieldWriterState() override;
void insert_element(uint32_t element_index, Cursor &array);
void insertField(uint32_t docId, vespalib::slime::Inserter &target) override;
};
StructMapAttributeFieldWriterState::StructMapAttributeFieldWriterState(const vespalib::string &keyAttributeName,
const std::vector<vespalib::string> &valueFieldNames,
const std::vector<vespalib::string> &valueAttributeNames,
IAttributeContext &context,
vespalib::Stash& stash,
const vespalib::string& field_name,
const MatchingElements *matching_elements)
: DocsumFieldWriterState(),
_keyWriter(nullptr),
_valueWriters(),
_field_name(field_name),
_matching_elements(matching_elements)
{
const IAttributeVector *attr = context.getAttribute(keyAttributeName);
if (attr != nullptr) {
_keyWriter = &AttributeFieldWriter::create(keyName, *attr, stash, true);
}
size_t fields = valueFieldNames.size();
_valueWriters.reserve(fields);
for (uint32_t field = 0; field < fields; ++field) {
attr = context.getAttribute(valueAttributeNames[field]);
if (attr != nullptr) {
_valueWriters.emplace_back(&AttributeFieldWriter::create(valueFieldNames[field], *attr, stash));
}
}
}
StructMapAttributeFieldWriterState::~StructMapAttributeFieldWriterState() = default;
void
StructMapAttributeFieldWriterState::insert_element(uint32_t element_index, Cursor &array)
{
Cursor &keyValueObj = array.addObject();
if (_keyWriter) {
_keyWriter->print(element_index, keyValueObj);
}
Cursor &obj = keyValueObj.setObject(valueName);
for (auto &valueWriter : _valueWriters) {
valueWriter->print(element_index, obj);
}
}
void
StructMapAttributeFieldWriterState::insertField(uint32_t docId, vespalib::slime::Inserter &target)
{
uint32_t elems = 0;
if (_keyWriter) {
elems = _keyWriter->fetch(docId);
}
for (auto &valueWriter : _valueWriters) {
elems = std::max(elems, valueWriter->fetch(docId));
}
if (elems == 0) {
return;
}
if (_matching_elements != nullptr) {
auto &elements = _matching_elements->get_matching_elements(docId, _field_name);
if (elements.empty() || elements.back() >= elems) {
return;
}
Cursor &arr = target.insertArray();
auto elements_iterator = elements.cbegin();
for (uint32_t idx = 0; idx < elems && elements_iterator != elements.cend(); ++idx) {
assert(*elements_iterator >= idx);
if (*elements_iterator == idx) {
insert_element(idx, arr);
++elements_iterator;
}
}
} else {
Cursor &arr = target.insertArray();
for (uint32_t idx = 0; idx < elems; ++idx) {
insert_element(idx, arr);
}
}
}
}
StructMapAttributeCombinerDFW::StructMapAttributeCombinerDFW(const vespalib::string &fieldName,
const StructFieldsResolver& fields_resolver,
bool filter_elements,
std::shared_ptr<MatchingElementsFields> matching_elems_fields)
: AttributeCombinerDFW(fieldName, filter_elements, std::move(matching_elems_fields)),
_keyAttributeName(fields_resolver.get_map_key_attribute()),
_valueFields(fields_resolver.get_map_value_fields()),
_valueAttributeNames(fields_resolver.get_map_value_attributes())
{
if (filter_elements && _matching_elems_fields && !_matching_elems_fields->has_field(fieldName)) {
fields_resolver.apply_to(*_matching_elems_fields);
}
}
StructMapAttributeCombinerDFW::~StructMapAttributeCombinerDFW() = default;
DocsumFieldWriterState*
StructMapAttributeCombinerDFW::allocFieldWriterState(IAttributeContext &context, vespalib::Stash& stash, const MatchingElements* matching_elements) const
{
return &stash.create<StructMapAttributeFieldWriterState>(_keyAttributeName, _valueFields, _valueAttributeNames, context, stash, _fieldName, matching_elements);
}
}
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