hg/apifest08: task2/solution14/src/org/apidesign/apifest08/currency/Convertor.java@2198184978d5

     1 package org.apidesign.apifest08.currency;

     3 /** This is the skeleton class for your API. You need to make it public, so

     4  * it is accessible to your client code (currently in Task1Test.java) file.

     5  * <p>

     6  * Feel free to create additional classes or rename this one, just keep all

     7  * the API and its implementation in this package. Do not spread it outside

     8  * to other packages.

     9  */

    10 public final class Convertor {

    11     private String currency1;

    12     private String currency2;

    13     private Rate rate;

    15     Convertor(String currency1, String currency2, Rate rate) {

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

    17             throw new IllegalArgumentException("All arguments have to be non-null.");

    18         }

    19         this.currency1 = currency1;

    20         this.currency2 = currency2;

    21         this.rate = rate;

    22     }

    24     public double convert(String fromCurrency, String toCurrency, int amount) {

    25         if ((fromCurrency == null)||(toCurrency == null)) {

    26             throw new IllegalArgumentException("All arguments have to be non-null.");

    27         }

    29         if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {

    30             return rate.convertAtoB(amount);

    31         } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {

    32             return rate.convertBtoA(amount);

    33         } else {

    34             throw new IllegalArgumentException("Convertor " + this.toString() +

    35                     " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");

    36         }

    37     }

    39     public double convert(String fromCurrency, String toCurrency, double amount) {

    40         if ((fromCurrency == null)||(toCurrency == null)) {

    41             throw new IllegalArgumentException("All arguments have to be non-null.");

    42         }

    44         if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {

    45             return rate.convertAtoB(amount);

    46         } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {

    47             return rate.convertBtoA(amount);

    48         } else {

    49             throw new IllegalArgumentException("Convertor " + this.toString() +

    50                     " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");

    51         }

    52     }

    54     @Override

    55     public String toString() {

    56         return currency1+currency2;

    57     }

    59     @Override

    60     public boolean equals(Object obj) {

    61         if (obj == null) {

    62             return false;

    63         }

    64         if (getClass() != obj.getClass()) {

    65             return false;

    66         }

    67         final Convertor other = (Convertor) obj;

    68         if (this.currency1 != other.currency1 && (this.currency1 == null || !this.currency1.equals(other.currency1))) {

    69             return false;

    70         }

    71         if (this.currency2 != other.currency2 && (this.currency2 == null || !this.currency2.equals(other.currency2))) {

    72             return false;

    73         }

    74         if (this.rate != other.rate && (this.rate == null || !this.rate.equals(other.rate))) {

    75             return false;

    76         }

    77         return true;

    78     }

    80     @Override

    81     public int hashCode() {

    82         int hash = 5;

    83         hash = 67 * hash + (this.currency1 != null ? this.currency1.hashCode() : 0);

    84         hash = 67 * hash + (this.currency2 != null ? this.currency2.hashCode() : 0);

    85         hash = 67 * hash + (this.rate != null ? this.rate.hashCode() : 0);

    86         return hash;

    87     }

    88 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Wed, 01 Oct 2008 11:23:11 +0200
changeset 32	2198184978d5
parent 25	a022dd2a5d30
child 49	de033c457bed
permissions	-rw-r--r--