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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "itermfielddata.h"
#include <vespa/searchlib/query/weight.h>
#include <vespa/vespalib/stllike/string.h>
#include <cstddef>
#include <optional>
namespace search::fef {
/**
* Interface to static match data for a single unit (term/phrase/etc).
**/
class ITermData
{
protected:
virtual ~ITermData() = default;
public:
/**
* Returns the term weight.
**/
virtual query::Weight getWeight() const = 0;
/**
* Returns the number of terms represented by this term data object.
**/
virtual uint32_t getPhraseLength() const = 0;
/**
* Obtain the unique id of this term. 0 means not set.
*
* @return unique id or 0
**/
virtual uint32_t getUniqueId() const = 0;
/**
* Returns the name of a query tensor this term is referencing, if set.
*/
virtual std::optional<vespalib::string> query_tensor_name() const = 0;
/**
* Get number of fields searched
**/
virtual size_t numFields() const = 0;
/**
* Direct access to data for individual fields
* @param i local index, must have: 0 <= i < numFields()
*/
virtual const ITermFieldData &field(size_t i) const = 0;
/**
* Obtain information about a specific field that may be searched
* by this term. If the requested field is not searched by this
* term, NULL will be returned.
*
* @param fieldId global field ID
* @return term field data, or NULL if not found
**/
virtual const ITermFieldData *lookupField(uint32_t fieldId) const = 0;
};
/**
* convenience adapter for easy iteration
**/
class ITermFieldRangeAdapter
{
const ITermData& _ref;
size_t _idx;
size_t _lim;
public:
explicit ITermFieldRangeAdapter(const ITermData& ref)
: _ref(ref), _idx(0), _lim(ref.numFields())
{}
bool valid() const { return (_idx < _lim); }
const ITermFieldData& get() const { return _ref.field(_idx); }
void next() { ++_idx; }
};
}
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