diff -r 251d0ed461fb -r 58ec6da75f6f task4/solution13/src/org/apidesign/apifest08/currency/ExchangeRate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution13/src/org/apidesign/apifest08/currency/ExchangeRate.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,68 @@
+
+package org.apidesign.apifest08.currency;
+
+import java.math.BigDecimal;
+
+/**
+ * Exchange rate value. Contains <code>from</code> and <code>to</code> value.
+ * 
+ * @author arnostvalicek
+ */
+public class ExchangeRate {
+    private BigDecimal numberFor;
+    private BigDecimal numberGet;
+
+    /**
+     * Constructor for new exchange rate holding two values - <em>from value</em> and <em>to value</em>
+     * @param fromValue Exchange rate <em>from value</em>
+     * @param toValue Exchange rate <em>to value</em>
+     */
+    public  ExchangeRate(BigDecimal fromValue, BigDecimal toValue) {
+        this.numberFor = fromValue;
+        this.numberGet = toValue;
+    }
+    
+    /**
+     * Create new instance of <code>ExchangeRate</code> based on provided exchange rate, but swapping its
+     * <em>from</em> and <em>to</em> value.
+     * <p>
+     * Provided exchange rate is not chaged, this method returns different instance describing reverted exchange rate.
+     * 
+     * @param rate Exchange rate which describes rate to be reverted.
+     * @return Instance of reverted rate.
+     */
+    public static ExchangeRate createRevertedRate(ExchangeRate rate) {
+        ExchangeRate reverted = new ExchangeRate(rate.getToValue(), rate.getFromValue());
+        return reverted;
+    }
+
+    @Override
+    public String toString() {
+        return "for "+numberFor+" recieve "+numberGet+" @"+getClass().getName();
+    }
+    
+    /**
+     * Return exchange rate <em>from</em> value stored in this object.
+     * @return Returns <em>from</em> value for this exchange rate.
+     */
+    public BigDecimal getFromValue() {
+        return numberFor;
+    }
+    
+    /**
+     * Return exchange rate <em>to</em> value stored in this object.
+     * @return Returns <em>to</em> value for this exchange rate.
+     */
+    public BigDecimal getToValue() {
+        return numberGet;
+    }
+    
+    
+//    public ExchangeRate createExchangeRate(BigDecimal forValue, BigDecimal getValue) {
+//        ExchangeRate rate = new ExchangeRate(forValue, getValue);
+//        return rate;
+//    }
+    
+    
+    
+}