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110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
/* $Id$ */
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/** @file ai_subsidy.hpp Everything to query subsidies. */
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#ifndef AI_SUBSIDY_HPP
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#define AI_SUBSIDY_HPP
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#include "ai_object.hpp"
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#include "ai_company.hpp"
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/**
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* Class that handles all subsidy related functions.
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*/
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class AISubsidy : public AIObject {
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public:
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static const char *GetClassName() { return "AISubsidy"; }
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/**
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* Enumeration for source and destination of a subsidy.
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* @note The list of values may grow in future.
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*/
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enum SubsidyParticipantType {
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SPT_INDUSTRY = 0, //!< Subsidy participant is an industry
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SPT_TOWN = 1, //!< Subsidy participant is a town
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SPT_INVALID = 0xFF, //!< Invalid/unknown participant type
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};
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/**
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* Check whether this is a valid SubsidyID.
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* @param subsidy_id The SubsidyID to check.
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* @return True if and only if this subsidy is still valid.
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*/
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static bool IsValidSubsidy(SubsidyID subsidy_id);
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/**
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* Checks whether this subsidy is already awarded to some company.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy).
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* @return True if and only if this subsidy is already awarded.
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*/
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static bool IsAwarded(SubsidyID subsidy_id);
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/**
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* Get the company index of the company this subsidy is awarded to.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsAwarded(subsidy_id).
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* @return The companyindex of the company this subsidy is awarded to.
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*/
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static AICompany::CompanyID GetAwardedTo(SubsidyID subsidy_id);
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/**
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* Get the date this subsidy expires. In case the subsidy is already
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* awarded, return the date the subsidy expires, else, return the date the
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* offer expires.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return The last valid date of this subsidy.
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* @note The return value of this function will change if the subsidy is
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* awarded.
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*/
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static int32 GetExpireDate(SubsidyID subsidy_id);
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/**
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* Get the cargo type that has to be transported in order to be awarded this
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* subsidy.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return The cargo type to transport.
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*/
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static CargoID GetCargoType(SubsidyID subsidy_id);
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/**
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* Returns the type of source of subsidy.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return Type of source of subsidy.
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*/
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static SubsidyParticipantType GetSourceType(SubsidyID subsidy_id);
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/**
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* Return the source IndustryID/TownID the subsidy is for.
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* \li GetSourceType(subsidy_id) == SPT_INDUSTRY -> return the IndustryID.
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* \li GetSourceType(subsidy_id) == SPT_TOWN -> return the TownID.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return One of TownID/IndustryID.
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*/
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static int32 GetSourceIndex(SubsidyID subsidy_id);
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/**
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* Returns the type of destination of subsidy.
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* @param subsidy_id The SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return Type of destination of subsidy.
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*/
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static SubsidyParticipantType GetDestinationType(SubsidyID subsidy_id);
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/**
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* Return the destination IndustryID/TownID the subsidy is for.
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* \li GetDestinationType(subsidy_id) == SPT_INDUSTRY -> return the IndustryID.
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* \li GetDestinationType(subsidy_id) == SPT_TOWN -> return the TownID.
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* @param subsidy_id the SubsidyID to check.
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* @pre IsValidSubsidy(subsidy_id).
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* @return One of TownID/IndustryID.
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*/
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static int32 GetDestinationIndex(SubsidyID subsidy_id);
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};
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#endif /* AI_SUBSIDY_HPP */
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