First.h

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#pragma once

#include "filter/IFilter.h"

namespace ai {

class First: public IFilter {
protected:
    Filters _filters;
public:
    First(const std::string& parameters, const Filters& filters) :
        IFilter("First", parameters), _filters(filters) {
        ai_assert(filters.size() == 1, "First must have one child");
    }
    FILTER_ACTION_FACTORY(First)

    void filter (const AIPtr& entity) override;
};

inline void First::filter (const AIPtr& entity) {
    FilteredEntities& filtered = getFilteredEntities(entity);
    const FilteredEntities copy = filtered;
    filtered.clear();
    _filters.front()->filter(entity);
    const auto& value = getFilteredEntities(entity).front();
    filtered.clear();
    for (auto& e : copy) {
        filtered.push_back(e);
    }
    filtered.push_back(value);
}

}