diff -r 251d0ed461fb -r 58ec6da75f6f task4/solution04/src/org/apidesign/apifest08/currency/InvalidConversionException.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution04/src/org/apidesign/apifest08/currency/InvalidConversionException.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,95 @@
+package org.apidesign.apifest08.currency;
+
+      
+import java.util.Currency;
+
+
+/**
+ * Thrown when a currency is invalid for a given Convertor.
+ * 
+ * @author D'Arcy Smith
+ * @version 1.0
+ */
+public class InvalidConversionException
+    extends Exception
+{
+    /**
+     * The currency that was tried.
+     */
+    private final Currency badCurrency;
+    
+    /**
+     * A currency that is valid for the Convertor.
+     */
+    private final Currency currencyA;
+
+    /**
+     * A currency that is valid for the Convertor.
+     */
+    private final Currency currencyB;
+    
+    
+    /**
+     * Construct a new InvalidConversionException with the specified message.
+     * 
+     * @param msg the message for getMessage.
+     * @param bad the currency that is not valid.
+     */
+    public InvalidConversionException(final String   msg,
+                                      final Currency bad)
+    {
+        this(msg, bad, null, null);
+    }
+
+    /**
+     * Construct a new InvalidConversionException with the specified message.
+     * 
+     * @param msg the message for getMessage.
+     * @param bad the currency that is not valid.
+     * @param a a valid currency.
+     * @param b a valid currency.
+     */
+    public InvalidConversionException(final String   msg,
+                                      final Currency bad,
+                                      final Currency a,
+                                      final Currency b)
+    {
+        super(msg);
+
+        badCurrency = bad;
+        currencyA   = a;
+        currencyB   = b;
+    }
+
+    /**
+     * Get the currency that is not valid.
+     * 
+     * @return the badCurrency
+     */
+    public Currency getBadCurrency()
+    {
+        return (badCurrency);
+    }
+
+    /**
+     * Get a currency that is valid.
+     * 
+     * @return the currencyA passed to the constructor.
+     */
+    public Currency getCurrencyA()
+    {
+        return (currencyA);
+    }
+
+    /**
+     * Get a currency that is valid.
+     * 
+     * @return the currencyB passed to the constructor.
+     */
+    public Currency getCurrencyB()
+    {
+        return (currencyB);
+    }
+
+
+}
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