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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 <vespa/searchcommon/attribute/attributecontent.h>
#include <vespa/searchcommon/attribute/i_multi_value_attribute.h>
#include <vespa/searchcommon/common/undefinedvalues.h>
#include <vespa/vespalib/data/slime/cursor.h>
#include <vespa/vespalib/util/stash.h>
#include <cassert>
using search::attribute::BasicType;
using search::attribute::IAttributeVector;
using search::attribute::getUndefined;
using search::attribute::IArrayReadView;
using vespalib::slime::Cursor;
namespace search::docsummary {
AttributeFieldWriter::AttributeFieldWriter(vespalib::Memory fieldName)
: _fieldName(fieldName)
{
}
AttributeFieldWriter::~AttributeFieldWriter() = default;
namespace {
template <class BasicType>
class WriteField : public AttributeFieldWriter
{
protected:
const IArrayReadView<BasicType>* _array_read_view;
vespalib::ConstArrayRef<BasicType> _content;
WriteField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash &stash);
~WriteField() override;
private:
uint32_t fetch(uint32_t docId) override;
};
class WriteStringField : public WriteField<const char*>
{
public:
WriteStringField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash);
~WriteStringField() override;
void print(uint32_t idx, Cursor &cursor) override;
};
class WriteStringFieldNeverSkip : public WriteField<const char*>
{
public:
WriteStringFieldNeverSkip(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash)
: WriteField(fieldName, attr, stash) {}
~WriteStringFieldNeverSkip() override = default;
void print(uint32_t idx, Cursor &cursor) override;
};
template <typename BasicType>
class WriteFloatField : public WriteField<BasicType>
{
public:
WriteFloatField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash);
~WriteFloatField() override;
void print(uint32_t idx, Cursor &cursor) override;
};
template <typename BasicType>
class WriteIntField : public WriteField<BasicType>
{
public:
WriteIntField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash);
~WriteIntField() override;
void print(uint32_t idx, Cursor &cursor) override;
};
template <typename BasicType>
const search::attribute::IArrayReadView<BasicType>*
make_array_read_view(const IAttributeVector& attribute, vespalib::Stash& stash)
{
auto multi_value_attribute = attribute.as_multi_value_attribute();
if (multi_value_attribute != nullptr) {
return multi_value_attribute->make_read_view(search::attribute::IMultiValueAttribute::ArrayTag<BasicType>(), stash);
}
return nullptr;
}
template <class BasicType>
WriteField<BasicType>::WriteField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash)
: AttributeFieldWriter(fieldName),
_array_read_view(make_array_read_view<BasicType>(attr, stash)),
_content()
{
}
template <class BasicType>
WriteField<BasicType>::~WriteField() = default;
template <class BasicType>
uint32_t
WriteField<BasicType>::fetch(uint32_t docId)
{
if (_array_read_view) {
_content = _array_read_view->get_values(docId);
}
return _content.size();
}
WriteStringField::WriteStringField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash)
: WriteField(fieldName, attr, stash)
{
}
WriteStringField::~WriteStringField() = default;
void
WriteStringField::print(uint32_t idx, Cursor &cursor)
{
if (idx < _content.size()) {
const char *s = _content[idx];
if (s[0] != '\0') {
cursor.setString(_fieldName, vespalib::Memory(s));
}
}
}
void
WriteStringFieldNeverSkip::print(uint32_t idx, Cursor &cursor)
{
if (idx < _content.size()) {
const char *s = _content[idx];
cursor.setString(_fieldName, vespalib::Memory(s));
} else {
cursor.setString(_fieldName, vespalib::Memory(""));
}
}
template <typename BasicType>
WriteFloatField<BasicType>::WriteFloatField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash)
: WriteField<BasicType>(fieldName, attr, stash)
{
}
template <typename BasicType>
WriteFloatField<BasicType>::~WriteFloatField() = default;
template <typename BasicType>
void
WriteFloatField<BasicType>::print(uint32_t idx, Cursor &cursor)
{
if (idx < this->_content.size()) {
double val = this->_content[idx];
if (!search::attribute::isUndefined(val)) {
cursor.setDouble(this->_fieldName, val);
}
}
}
template <typename BasicType>
WriteIntField<BasicType>::WriteIntField(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash)
: WriteField<BasicType>(fieldName, attr, stash)
{
}
template <typename BasicType>
WriteIntField<BasicType>::~WriteIntField() = default;
template <typename BasicType>
void
WriteIntField<BasicType>::print(uint32_t idx, Cursor &cursor)
{
if (idx < this->_content.size()) {
auto val = this->_content[idx];
if (val != getUndefined<BasicType>()) {
cursor.setLong(this->_fieldName, val);
}
}
}
}
AttributeFieldWriter&
AttributeFieldWriter::create(vespalib::Memory fieldName, const IAttributeVector& attr, vespalib::Stash& stash, bool keep_empty_strings)
{
switch (attr.getBasicType()) {
case BasicType::INT8:
return stash.create<WriteIntField<int8_t>>(fieldName, attr, stash);
case BasicType::INT16:
return stash.create<WriteIntField<int16_t>>(fieldName, attr, stash);
case BasicType::INT32:
return stash.create<WriteIntField<int32_t>>(fieldName, attr, stash);
case BasicType::INT64:
return stash.create<WriteIntField<int64_t>>(fieldName, attr, stash);
case BasicType::FLOAT:
return stash.create<WriteFloatField<float>>(fieldName, attr, stash);
case BasicType::DOUBLE:
return stash.create<WriteFloatField<double>>(fieldName, attr, stash);
case BasicType::STRING:
if (keep_empty_strings) {
return stash.create<WriteStringFieldNeverSkip>(fieldName, attr, stash);
} else {
return stash.create<WriteStringField>(fieldName, attr, stash);
}
default:
assert(false);
}
}
}
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