SwingContainer


1   /*
2   
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5    ============================================================================
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7    Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
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9    Redistribution and use in source and binary forms, with or without modifica-
10   tion, are permitted provided that the following conditions are met:
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12   1. Redistributions of  source code must  retain the above copyright  notice,
13      this list of conditions and the following disclaimer.
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23      and wherever such third-party acknowledgments normally appear.
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25   4. The names "Jakarta", "Avalon", "Excalibur" and "Apache Software Foundation"
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49  */
50  package org.apache.avalon.fortress.examples.swing;
51  
52  /**
53   * Simple Fortress based container containing a Swing implementation of Hello World.
54   * This container creates a small Swing based GUI displaying a combobox of available
55   * languages from the translator component.
56   *
57   * @author <a HREF="mailto:crafterm@apache.org">Marcus Crafter</a>
58   * @version CVS $Revision: 1.6 $ $Date: 2003/04/11 07:36:21 $
59   */
60  public final class SwingContainer extends org.apache.avalon.fortress.impl.DefaultContainer
61      implements org.apache.avalon.framework.activity.Startable, java.awt.event.ActionListener  , Runnable  
62  {
63      // Component references
64      private org.apache.avalon.fortress.examples.components.Translator m_translator;
65  
66      // GUI references
67      private javax.swing.JFrame   m_frame;
68      private javax.swing.JLabel   m_label;
69  
70      // Dictionary key
71      private String   m_key = "hello-world";
72  
73      /**
74       * Initializes this component. Creates simple Swing GUI containing
75       * available translations for the key 'hello-world'.
76       *
77       * @exception java.lang.Exception if an error occurs
78       */
79      public void initialize()
80          throws Exception  
81      {
82          super.initialize();
83  
84          // obtain translator component
85          m_translator = (org.apache.avalon.fortress.examples.components.Translator)m_serviceManager.lookup( org.apache.avalon.fortress.examples.components.Translator.ROLE );
86  
87          // create combo box
88          javax.swing.JComboBox   cb = new javax.swing.JComboBox  ( m_translator.getSupportedLanguages( m_key ) );
89          cb.addActionListener( this );
90  
91          // create label
92          m_label = new javax.swing.JLabel  ( "Select your language" );
93          m_label.setPreferredSize( new java.awt.Dimension  ( 150, 30 ) );
94  
95          // create panel holding box and label
96          javax.swing.JPanel   panel = new javax.swing.JPanel  ();
97          panel.add( cb );
98          panel.add( m_label );
99  
100         // create main frame
101         m_frame = new javax.swing.JFrame  ( "Hello World!" );
102         m_frame.setDefaultCloseOperation( javax.swing.JFrame.EXIT_ON_CLOSE );
103         m_frame.setContentPane( panel );
104         m_frame.pack();
105 
106         // all done
107         if( getLogger().isDebugEnabled() )
108         {
109             getLogger().debug( "Initialized" );
110         }
111     }
112 
113     /**
114      * Starts the component, makes GUI visible, ready for use.
115      */
116     public void start()
117     {
118         m_frame.setVisible( true );
119 
120         if( getLogger().isDebugEnabled() )
121         {
122             getLogger().debug( "GUI Activated" );
123         }
124     }
125 
126     public void run()
127     {
128         while( m_frame.isVisible() )
129         {
130             try
131             {
132                 Thread.sleep( 1000 );
133             }
134             catch( InterruptedException   ie )
135             {
136                 m_frame.setVisible( false );
137             }
138         }
139     }
140 
141     /**
142      * Stops component, make GUI invisible, ready for decomissioning.
143      */
144     public void stop()
145     {
146         m_frame.setVisible( false );
147 
148         if( getLogger().isDebugEnabled() )
149         {
150             getLogger().debug( "GUI Disactivated" );
151         }
152     }
153 
154     /**
155      * Method called when the user changes the selected item in the
156      * combobox.
157      *
158      * @param evt an <code>ActionEvent</code> instance
159      */
160     public void actionPerformed( java.awt.event.ActionEvent   evt )
161     {
162         javax.swing.JComboBox   cb = (javax.swing.JComboBox  )evt.getSource();
163         String   selected = (String  )cb.getSelectedItem();
164 
165         m_label.setText( m_translator.getTranslation( m_key, selected ) );
166 
167         if( getLogger().isDebugEnabled() )
168         {
169             getLogger().debug( "Language changed to " + selected );
170         }
171     }
172 
173     /**
174      * Cleans up references to retrieved components.
175      */
176     public void dispose()
177     {
178         if( m_translator != null )
179             m_serviceManager.release( m_translator );
180 
181         m_frame.dispose();
182 
183         super.dispose();
184     }
185 }
186 
187
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