// UML class diagram of a vending machine
class VendingMachine {
singleton;
1 -- * Dispenser slots;
}
class Dispenser {
Character row;
Character column;
}
// It is possible for a dispenser to have
// one product type 'in front' and another in behind
class ProductInDispenser {
* -- 1 Dispenser;
* -- 1 ProductType;
Integer numberProductsOfThisTypeLeft;
}
class ProductType {
Integer pricePerUnit; // cents
}
class VendingMachine {
1 -- * CoinHolder;
}
class CoinType {
Integer value; // cents
Integer weight; // grams
Integer diameter; // micrometers
}
class CoinHolder {
* -- 1 CoinType canHold;
Integer numCoinsCapacity;
Integer currentNumberOfCoins;
}
// Every product purchase is recorded
class ProductTransaction {
* -- 1 ProductInDispenser;
1 -- * CoinHolderTransaction; // coins entered and change given
}
// The number of coins transferred to or from a CoinHolder
class CoinHolderTransaction {
Integer numCoinsInOrOut; // negative if used to provide change
* -- 1 CoinHolder sourceOrDestination;
}
//Positions used for diagram display
class VendingMachine
{
position 50 29 119 45;
position.association Dispenser:slots__VendingMachine 120,23 0,8;
position.association CoinHolder__VendingMachine 27,45 5,0;
}
class Dispenser
{
position 290 29 149 80;
}
class ProductInDispenser
{
position 166 157 291 63;
position.association ProductInDispenser__ProductType 10,63 30,0;
position.association Dispenser__ProductInDispenser 217,0 56,80;
}
class ProductType
{
position 120 254 166 63;
}
class CoinType
{
position 45 531 144 97;
}
class CoinHolder
{
position 29 362 236 80;
position.association CoinHolder__CoinType:canHold 40,80 90,0;
}
class ProductTransaction
{
position 337 277 136 45;
position.association CoinHolderTransaction__ProductTransaction 112,46 179,0;
position.association ProductInDispenser__ProductTransaction 3,0 93,63;
}
class CoinHolderTransaction
{
position 283 501 201 63;
position.association CoinHolder:sourceOrDestination__CoinHolderTransaction 16,0 223,80;
}//$?[End_of_model]$?
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