src/com/interrupt/bookkeeping/currency/Currencies.java

   1 package com.interrupt.bookkeeping.currency;
   2
   3 import com.interrupt.bookkeeping.exception.CurrencyException;
   4
   5 public class Currencies extends GCurrencies {
   6
   7
   8         private static Currencies instance = null;
   9         public Currencies() {}
  10
  11         public static Currencies instance() {
  12
  13                 if(instance == null) {
  14                         instance = new Currencies();
  15                 }
  16                 return instance;
  17         }
  18
  19
  20         /**
  21          * currency ids must be unique
  22          */
  23         public void addCurrency(ICurrency currency) {
  24
  25                 ICurrency existingc = this.findCurrencyById(currency.getId());
  26                 if(existingc != null) {
  27                         throw new CurrencyException("There is already a currency with the id["+currency.getId()+"]");
  28                 }
  29
  30                 super.addCurrency(currency);
  31
  32         }
  33
  34 }
  35