hg/apifest08: task4/solution04/src/org/apidesign/apifest08/currency/ConverterImpl.java@2ae6e4aa7aef

     1 package org.apidesign.apifest08.currency;

     4 import java.math.BigDecimal;

     5 import java.util.Currency;

     6 import java.util.Set;

     9 /**

    10  * Convert between two currencies.

    11  *

    12  * @author D'Arcy Smith

    13  * @version 1.1

    14  */

    15 class ConvertorImpl

    16     implements ExchangeRateConvertor

    17 {

    18     /**

    19      */

    20     private final ExchangeRate rate;

    22     /**

    23      * Constructs a convertor with the specified currencies.

    24      *

    25      * @param a the currency to convert from.

    26      * @param aRate the exchage rage between from and to.

    27      * @param b the currency to convert to.

    28      * @param bRate the exchage rage between to and from.

    29      * @throws IllegalArgumentException if either any of the arguments are null or if either rate <= 0.

    30      */

    31     public ConvertorImpl(final ExchangeRate r)

    32     {

    33         if(r == null)

    34         {

    35             throw new IllegalArgumentException("r cannot be null");

    36         }

    38         rate = r;

    39     }

    41     /**

    42      * Convert an amount from one currency to another.

    43      *

    44      * @param from the currency to convert from.

    45      * @param to the currency to convert to.

    46      * @param amount the amount to convert.

    47      * @return the converted amount.

    48      * @throws IllegalArgumentException if any of the arguments are null.

    49      * @throws InvalidConversionException if either from or to are not equal to the currencies passed to the constructor.

    50      */

    51     public BigDecimal convert(final Currency   from,

    52                               final Currency   to,

    53                               final BigDecimal amount)

    54         throws InvalidConversionException

    55     {

    56         return (rate.convert(from, to, amount));

    57     }

    59     /**

    60      * Check to see if converting between the two currencies is possible.

    61      *

    62      * @param from the currency to convert from.

    63      * @param to the currency to convert to.

    64      * @return true if the conversion is possible.

    65      * @throws IllegalArgumentException if either from or to are null.

    66      */

    67     public boolean canConvert(final Currency from, final Currency to)

    68     {

    69         return (rate.canConvert(from, to));

    70     }

    72     /**

    73      * Get the currencies that the convertor supports.

    74      *

    75      * @return the supported currencies.

    76      */

    77     public Set<Currency> getCurrencies()

    78     {

    79         return (rate.getCurrencies());

    80     }

    82     /**

    83      * Get the conversion rate between two currencies.

    84      *

    85      * @param from the currency to convert from.

    86      * @param to the currency to convert to.

    87      * @return the conversion rate between the two currencies.

    88      * @throws InvalidConversionException if canConvert would return false.

    89      * @throws IllegalArgumentException if either from or to are null.

    90      */

    91     public BigDecimal getConversionRate(final Currency from,

    92                                         final Currency to)

    93         throws InvalidConversionException

    94     {

    95         return (rate.getConversionRate(from, to));

    96     }

    98     /**

    99      * Check to see if two ConvertorImpls are equal.

   100      *

   101      * @param obj the object to check

   102      * @return if the ConvertorImpls are not the same (cuyrrencies and rates).

   103      */

   104     @Override

   105     public boolean equals(Object obj)

   106     {

   107         if (obj == null)

   108         {

   109             return false;

   110         }

   112         if (getClass() != obj.getClass())

   113         {

   114             return false;

   115         }

   117         final ConvertorImpl other = (ConvertorImpl) obj;

   119         return (rate.equals(other.rate));

   120     }

   122     /**

   123      * Get the hashCode of the Convertor.

   124      *

   125      * @return the hashCode of the convertor.

   126      */

   127     @Override

   128     public int hashCode()

   129     {

   130         return (rate.hashCode());

   131     }

   133     /**

   134      * Get the currencyCode of both currencies.

   135      *

   136      * @return the currency codes of both currencies.

   137      */

   138     @Override

   139     public String toString()

   140     {

   141         return (rate.getCurrencyA().getCurrencyCode() + " to " + rate.getCurrencyB().getCurrencyCode());

   142     }

   144     public ExchangeRate getExchangeRate()

   145     {

   146         return (rate);

   147     }

   148 }

author	Jaroslav Tulach <jtulach@netbeans.org>
	Sat, 25 Oct 2008 20:53:00 +0200
changeset 84	2ae6e4aa7aef
parent 61	58ec6da75f6f
permissions	-rw-r--r--