92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
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#ifndef STATION_H
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#define STATION_H
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// Pocet trati k dispozicii
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#define STATION_SIZE 10
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// Maximalny pocet znakov pre ulozenie nazvu cielovej stanice
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#define TARGET_SIZE 36
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/**
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* Jeden zaznam o kapacite do cielovej stanice
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*/
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struct car {
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// Cielova stanica / nazov
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char value[TARGET_SIZE];
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// Pocet cestujuchich
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int capacity;
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// Smernik na dalsi zaznam
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struct car* next;
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};
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/**
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* Cela databaza zaznamov
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*/
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struct station {
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// Dynamicke pole smernikov na zaznamy
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// jeden zaznam ma typ struct car*
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struct car** tracks;
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// Velkost pola tracks
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int track_count;
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};
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/**
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* Vytvori prazdnu stanicu.
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* Alokuje pole smernikov tracks na pociatocnu kapacitu STATION_SIZE
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* nastavi velkost capacity na STATION_SIZE
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* @return smernik na prazdnu stanicu
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*/
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struct station* create_station();
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/**
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* Uvolni pamat
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* @param smernik na databazu
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*/
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void destroy_station(struct station* station);
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/**
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* Vyberie poziciu v poli station->tracks pre ulozenie zaznamu target
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*
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* Proces vyberu by mal splnat kriteria pre hash funkciu:
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* - rovnaky retazec by mal vzdy mat rovnaky vysledok
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* - pre rozne retazce by mali byt vysledky co najviac rozne
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*
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* @param smernik na databazu
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* @param nazov cielovej stanice
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* @return cislo v intervale 0 az N-1, kde N je station->track_count
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*/
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int select_track(struct station* station, const char* target);
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/**
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* Zvysi zaznam o pocte cestujucich do danej cielovej stanice.
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*
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* Najprv sa vyberie cielova trat pomocou select_track(). Ak zaznam neexistuje,
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* vytvori sa novy. Ak zaznam na danej trati (spojkovom zozname) existuje, cislo sa pripocita.
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* V databaze nesmu byt dva zaznamy s rovnakou cielovou stanicou.
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*
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* @param smernik na databazu
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* @param nazov cielovej stanice
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*/
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void add_target_capacity(struct station* station,const char* target, int capacity);
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/**
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* Ziska zaznam o cielovej stanici.
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* @param smernik na databazu
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* @param nazov cielovej stanice
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*
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* @return kapacitu do cielovej stanice. Ak sa zaznam nenachedza, vrati nula.
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*/
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int get_target_capacity(struct station* station,const char* target);
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/**
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* Spocita pocet cielovych stanic
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* @param smernik na databazu
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*/
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int count_targets(struct station* station);
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/**
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* Spocita kapacitu vo vsetkych zaznamoch
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* @param smernik na databazu
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*/
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int count_capacity(struct station* station);
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#endif
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