package org.apidesign.apifest08.currency;

 public final class CurrencyRateImpl implements CurrencyRate, TimeLimitedCurrencyRate {

     private String currency1;

     private String currency2;

     private Rate rate;

     private long fromTime;

     private long toTime;

     CurrencyRateImpl(final String currency1, final String currency2, final Rate rate) {

         if ((currency1 == null)||(currency2 == null) || (rate == null)) {

             throw new IllegalArgumentException("Argument cannot be null.");

         }

         if ("".equals(currency1) || "".equals(currency2)) {

             throw new IllegalArgumentException("Name of currency cannot be empty string");

         }

         if (currency1.equals(currency2)) {

             throw new IllegalArgumentException("Currencies in rate cannot be the same");

         }

         this.currency1 = currency1;

         this.currency2 = currency2;

         this.rate = rate;

         this.fromTime = Long.MIN_VALUE;

         this.toTime = Long.MAX_VALUE;

     }

     CurrencyRateImpl(final String currency1, final String currency2, final Rate rate, final long fromTime, final long toTime) {

         if ((currency1 == null)||(currency2 == null) || (rate == null)) {

             throw new IllegalArgumentException("Argument cannot be null.");

         }

         if ("".equals(currency1) || "".equals(currency2)) {

             throw new IllegalArgumentException("Name of currency cannot be empty string");

         }

         if (currency1.equals(currency2)) {

             throw new IllegalArgumentException("Currencies in rate cannot be the same");

         }

         if (fromTime > toTime) {

             throw new IllegalArgumentException("Invalid time range");

         }

         this.currency1 = currency1;

         this.currency2 = currency2;

         this.rate = rate;

         this.fromTime = fromTime;

         this.toTime = toTime;

     }

     public String getCurrency1() {

         return currency1;

     }

     public String getCurrency2() {

         return currency2;

     }

     public Rate getRate(){

         return rate;

     }

     public long getFromTime() {

         return fromTime;

     }

     public long getToTime() {

         return toTime;

     }

 }