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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/stllike/hash_map.h>
#include <optional>
namespace search::docsummary {
/**
* Class filtering which fields to render in a struct field.
*/
class SlimeFillerFilter {
public:
/**
* Iterator used to step through the sub fields of a struct field
* to find out which parts to render.
*/
class Iterator {
private:
friend class SlimeFillerFilter;
bool _should_render;
const SlimeFillerFilter* _next;
explicit Iterator(bool should_render_in) noexcept;
explicit Iterator(const SlimeFillerFilter* next) noexcept;
public:
Iterator check_field(vespalib::stringref field_name) const;
bool should_render() const noexcept { return _should_render; }
};
private:
vespalib::hash_map<vespalib::string, std::unique_ptr<SlimeFillerFilter>> _filter;
Iterator check_field(vespalib::stringref field_name) const;
public:
SlimeFillerFilter();
~SlimeFillerFilter();
Iterator begin() const;
bool empty() const;
/**
* Add a field path (e.g 'my_field.my_subfield') that should be rendered.
*/
SlimeFillerFilter& add(vespalib::stringref field_path);
/**
* Called by DocsumFilter::prepareFieldSpec() with each input field name as field_path. First component
* is assumed to be the same as the output field name.
*/
static void add_remaining(std::unique_ptr<SlimeFillerFilter>& filter, vespalib::stringref field_path);
/**
* Returns a pass-through filter iterator that renders all parts of a struct field.
*/
static Iterator all();
};
}
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