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→Real-life Application
== Real-life Application ==
<pre>
/*
* 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.avalon.framework.component.test;
import junit.framework.TestCase;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.component.ComponentException;
import org.apache.avalon.framework.component.DefaultComponentManager;
/**
* Test the basic public methods of DefaultComponentManager.
*
* @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
*/
public final class DefaultComponentManagerTestCase
extends TestCase
{
class DefaultRoleA
implements Component,RoleA
{
public DefaultRoleA()
{
}
}
class DefaultRoleB
implements Component,RoleB
{
public DefaultRoleB()
{
}
}
private DefaultComponentManager m_componentManager;
protected boolean m_exceptionThrown;
public DefaultComponentManagerTestCase()
{
this("DefaultComponentManager Test Case");
}
public DefaultComponentManagerTestCase( final String name )
{
super( name );
}
protected void setUp()
throws Exception
{
m_componentManager = new DefaultComponentManager();
m_exceptionThrown = false;
}
protected void tearDown()
throws Exception
{
m_componentManager = null;
}
/**
* lookup contract:
* return first component found for role
* search in hirarchy from current componentManager up.
* if no compnent exist for role a in hierarchy
* throw ComponentException
*/
public void testlookup1()
throws Exception
{
DefaultRoleB roleBinBase = new DefaultRoleB();
DefaultRoleB roleBinParent = new DefaultRoleB();
DefaultRoleA roleAinParent = new DefaultRoleA();
m_componentManager.put(RoleA.ROLE,roleAinParent);
m_componentManager.put(RoleB.ROLE,roleBinParent);
DefaultComponentManager baseComponentManager = new DefaultComponentManager(m_componentManager);
baseComponentManager.put(RoleB.ROLE,roleBinBase);
Object lookupAinBase = baseComponentManager.lookup(RoleA.ROLE);
Object lookupBinBase = baseComponentManager.lookup(RoleB.ROLE);
Object lookupBinParent = m_componentManager.lookup(RoleB.ROLE);
assertTrue( lookupAinBase instanceof RoleA);
assertEquals( lookupBinBase, roleBinBase );
assertEquals( lookupBinParent, roleBinParent );
assertEquals( lookupAinBase,roleAinParent);
}
public void testlookup2()
throws Exception
{
m_componentManager.put(RoleA.ROLE,new DefaultRoleA());
Object o = null;
try
{
o = m_componentManager.lookup(RoleB.ROLE);
}
catch (ComponentException ce)
{
m_exceptionThrown = true;
}
if (o == null)
assertTrue("ComponentException was not thrown when component was not found by lookup." ,m_exceptionThrown );
else
assertTrue("component was found by lookup ,when there was no component.",false);
}
public void testhasComponent()
throws Exception
{
m_componentManager.put(RoleA.ROLE,new DefaultRoleA());
assertTrue(m_componentManager.hasComponent(RoleA.ROLE));
assertTrue(!m_componentManager.hasComponent(RoleB.ROLE));
}
public void testmakeReadOnly()
throws Exception
{
//before read only
m_componentManager.put(RoleA.ROLE,new DefaultRoleA());
Object a = m_componentManager.lookup(RoleA.ROLE);
assertTrue( a instanceof RoleA);
m_componentManager.makeReadOnly();
//after read only
try
{
m_componentManager.put(RoleB.ROLE,new DefaultRoleB());
}
catch (IllegalStateException se)
{
m_exceptionThrown = true;
}
assertTrue("IllegalStateException was not thrown in put after makeReadOnly." , m_exceptionThrown );
}
}
</pre>
== References ==
[[BTP600|BTP600 Wiki Page]]<br/>
[http://en.wikipedia.org/wiki/Template_method_pattern| Template Method on Wikipedia]<br/>