jtulach@374: package org.apidesign.openfixed;
jtulach@374: 
jtulach@374: import java.util.ArrayList;
jtulach@374: import java.util.List;
jtulach@374: import junit.framework.TestCase;
jtulach@374: 
jtulach@374: public abstract class CalculatorBase extends TestCase {
jtulach@374:     
jtulach@374:     public CalculatorBase(String testName) {
jtulach@374:         super(testName);
jtulach@374:     }
jtulach@374:     
jtulach@374:     protected abstract Calculator create();
jtulach@374: 
jtulach@374:     public void testSumAndListeners() throws Exception {
jtulach@374:         Calculator a = create();
jtulach@374:         MockListener l = new MockListener();
jtulach@374:         a.addModificationListener(l);
jtulach@374:         a.add(5);
jtulach@374:         a.add(10);
jtulach@374:         a.add(20);
jtulach@374:         int ch = allChanges(l.assertEvents("Three changes", 3));
jtulach@374:         assertEquals("35 was the change", 35, ch);
jtulach@374:         assertEquals("Current value", 35, a.getSum());
jtulach@374:         a.add(-5);
jtulach@374:         int ch2 = allChanges(l.assertEvents("One change", 1));
jtulach@374:         assertEquals("minus five was the change", -5, ch2);
jtulach@374:         assertEquals("Final value", 30, a.getSum());
jtulach@374:     }
jtulach@374:     
jtulach@374:     private static int allChanges(List<ModificationEvent> events) {
jtulach@374:         int changes = 0;
jtulach@374:         for (ModificationEvent me : events) {
jtulach@374:             changes += me.getChange();
jtulach@374:         }
jtulach@374:         return changes;
jtulach@374:     }
jtulach@374:     
jtulach@374:     public static class MockListener implements ModificationListener {
jtulach@374:         private List<ModificationEvent> events;
jtulach@374:         
jtulach@374:         @Override
jtulach@374:         public synchronized void modification(ModificationEvent ev) {
jtulach@374:             if (events == null) {
jtulach@374:                 events = new ArrayList<ModificationEvent>();
jtulach@374:             }
jtulach@374:             events.add(ev);
jtulach@374:         }
jtulach@374:         
jtulach@374:         public synchronized List<ModificationEvent> assertEvents(String msg, int cnt) 
jtulach@374:         throws InterruptedException {
jtulach@374:             for (int i = 0; i < 10; i++) {
jtulach@374:                 if (events != null && events.size() >= cnt) {
jtulach@374:                     break;
jtulach@374:                 }
jtulach@374:                 wait(1000);
jtulach@374:             }
jtulach@374:             assertEquals(msg + ":\n" + events, cnt, events.size());
jtulach@374:             List<ModificationEvent> res = events;
jtulach@374:             events = null;
jtulach@374:             return res;
jtulach@374:         }
jtulach@374:     } // end of ModificationListener
jtulach@374: }