/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.tests.java.util;
import java.util.Observable;
import java.util.Observer;
import java.util.Vector;
public class ObservableTest extends junit.framework.TestCase {
static class TestObserver implements Observer {
public Vector objv = new Vector();
int updateCount = 0;
public void update(Observable observed, Object arg) {
++updateCount;
objv.add(arg);
}
public int updateCount() {
return updateCount;
}
}
static class DeleteTestObserver implements Observer {
int updateCount = 0;
boolean deleteAll = false;
public DeleteTestObserver(boolean all) {
deleteAll = all;
}
public void update(Observable observed, Object arg) {
++updateCount;
if (deleteAll)
observed.deleteObservers();
else
observed.deleteObserver(this);
}
public int updateCount() {
return updateCount;
}
}
static class TestObservable extends Observable {
public void doChange() {
setChanged();
}
public void clearChange() {
clearChanged();
}
}
Observer observer;
TestObservable observable;
/**
* java.util.Observable#Observable()
*/
public void test_Constructor() {
// Test for method java.util.Observable()
try {
Observable ov = new Observable();
assertTrue("Wrong initial values.", !ov.hasChanged());
assertEquals("Wrong initial values.", 0, ov.countObservers());
} catch (Exception e) {
fail("Exception during test : " + e.getMessage());
}
}
/**
* java.util.Observable#addObserver(java.util.Observer)
*/
public void test_addObserverLjava_util_Observer() {
// Test for method void
// java.util.Observable.addObserver(java.util.Observer)
TestObserver test = new TestObserver();
observable.addObserver(test);
assertEquals("Failed to add observer", 1, observable.countObservers());
observable.addObserver(test);
assertEquals("Duplicate observer", 1, observable.countObservers());
Observable o = new Observable();
try {
o.addObserver(null);
fail("Expected adding a null observer to throw a NPE.");
} catch (NullPointerException ex) {
// expected;
} catch (Throwable ex) {
fail("Did not expect adding a new observer to throw a "
+ ex.getClass().getName());
}
}
/**
* java.util.Observable#countObservers()
*/
public void test_countObservers() {
// Test for method int java.util.Observable.countObservers()
assertEquals("New observable had > 0 observers", 0, observable
.countObservers());
observable.addObserver(new TestObserver());
assertEquals("Observable with observer returned other than 1", 1, observable
.countObservers());
}
/**
* java.util.Observable#deleteObserver(java.util.Observer)
*/
public void test_deleteObserverLjava_util_Observer() {
// Test for method void
// java.util.Observable.deleteObserver(java.util.Observer)
observable.addObserver(observer = new TestObserver());
observable.deleteObserver(observer);
assertEquals("Failed to delete observer",
0, observable.countObservers());
observable.deleteObserver(observer);
observable.deleteObserver(null);
}
/**
* java.util.Observable#deleteObservers()
*/
public void test_deleteObservers() {
// Test for method void java.util.Observable.deleteObservers()
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.addObserver(new TestObserver());
observable.deleteObservers();
assertEquals("Failed to delete observers",
0, observable.countObservers());
}
/**
* java.util.Observable#hasChanged()
*/
public void test_hasChanged() {
assertFalse(observable.hasChanged());
observable.addObserver(observer = new TestObserver());
observable.doChange();
assertTrue(observable.hasChanged());
}
public void test_clearChanged() {
assertFalse(observable.hasChanged());
observable.addObserver(observer = new TestObserver());
observable.doChange();
assertTrue(observable.hasChanged());
observable.clearChange();
assertFalse(observable.hasChanged());
}
/**
* java.util.Observable#notifyObservers()
*/
public void test_notifyObservers() {
// Test for method void java.util.Observable.notifyObservers()
observable.addObserver(observer = new TestObserver());
observable.notifyObservers();
assertEquals("Notified when unchnaged", 0, ((TestObserver) observer)
.updateCount());
((TestObservable) observable).doChange();
observable.notifyObservers();
assertEquals("Failed to notify",
1, ((TestObserver) observer).updateCount());
DeleteTestObserver observer1, observer2;
observable.deleteObservers();
observable.addObserver(observer1 = new DeleteTestObserver(false));
observable.addObserver(observer2 = new DeleteTestObserver(false));
observable.doChange();
observable.notifyObservers();
assertTrue("Failed to notify all", observer1.updateCount() == 1
&& observer2.updateCount() == 1);
assertEquals("Failed to delete all", 0, observable.countObservers());
observable.addObserver(observer1 = new DeleteTestObserver(false));
observable.addObserver(observer2 = new DeleteTestObserver(false));
observable.doChange();
observable.notifyObservers();
assertTrue("Failed to notify all 2", observer1.updateCount() == 1
&& observer2.updateCount() == 1);
assertEquals("Failed to delete all 2", 0, observable.countObservers());
}
/**
* java.util.Observable#notifyObservers(java.lang.Object)
*/
public void test_notifyObserversLjava_lang_Object() {
// Test for method void
// java.util.Observable.notifyObservers(java.lang.Object)
Object obj;
observable.addObserver(observer = new TestObserver());
observable.notifyObservers();
assertEquals("Notified when unchanged", 0, ((TestObserver) observer)
.updateCount());
((TestObservable) observable).doChange();
observable.notifyObservers(obj = new Object());
assertEquals("Failed to notify",
1, ((TestObserver) observer).updateCount());
assertTrue("Failed to pass Object arg", ((TestObserver) observer).objv
.elementAt(0).equals(obj));
}
/**
* Sets up the fixture, for example, open a network connection. This method
* is called before a test is executed.
*/
protected void setUp() {
observable = new TestObservable();
}
/**
* Tears down the fixture, for example, close a network connection. This
* method is called after a test is executed.
*/
protected void tearDown() {
}
}