001    /*****************************************************************************
002     * Copyright (C) PicoContainer Organization. All rights reserved.            *
003     * ------------------------------------------------------------------------- *
004     * The software in this package is published under the terms of the BSD      *
005     * style license a copy of which has been included with this distribution in *
006     * the LICENSE.txt file.                                                     *
007     *                                                                           *
008     * Original code by                                                          *
009     *****************************************************************************/
010    package org.picocontainer.doc.introduction;
011    
012    import junit.framework.TestCase;
013    import org.picocontainer.MutablePicoContainer;
014    import org.picocontainer.injectors.AbstractInjector;
015    import org.picocontainer.DefaultPicoContainer;
016    
017    /**
018     * @author Aslak Hellesøy
019     */
020    public class HierarchyTestCase extends TestCase {
021        public void testHierarchy() {
022            try {
023                // START SNIPPET: wontwork
024                // Create x hierarchy of containers
025                MutablePicoContainer x = new DefaultPicoContainer();
026                MutablePicoContainer y = new DefaultPicoContainer( x );
027                MutablePicoContainer z = new DefaultPicoContainer( x );
028    
029                // Assemble components
030                x.addComponent(Apple.class);
031                y.addComponent(Juicer.class);
032                z.addComponent(Peeler.class);
033    
034                // Instantiate components
035                Peeler peeler = z.getComponent(Peeler.class);
036                // WON'T WORK! peeler will be null
037                peeler = x.getComponent(Peeler.class);
038                // WON'T WORK! This will throw an exception
039                Juicer juicer = y.getComponent(Juicer.class);
040                // END SNIPPET: wontwork
041            } catch (AbstractInjector.UnsatisfiableDependenciesException e) {
042                // expected
043            }
044        }
045    
046    }