diff -r 03c5c5dc94e7 -r 58ec6da75f6f task4/solution14/src/org/apidesign/apifest08/currency/CurrencyRateImpl.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution14/src/org/apidesign/apifest08/currency/CurrencyRateImpl.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,37 @@
+
+package org.apidesign.apifest08.currency;
+
+public final class CurrencyRateImpl implements CurrencyRate {
+    private String currency1;
+    private String currency2;
+    private Rate rate;
+    
+    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;
+    }
+
+    public String getCurrency1() {
+        return currency1;
+    }
+            
+    public String getCurrency2() {
+        return currency2;
+    }
+
+    public Rate getRate(){
+        return rate;
+    }
+
+}