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 package org.netbeans.modules.examplemodule03;

 import org.openide.ErrorManager;

 import org.openide.util.HelpCtx;

 import org.openide.util.NbBundle;

 import org.openide.windows.TopComponent;

 import org.openide.windows.WindowManager;

 import java.awt.BorderLayout;

 import javax.swing.JButton;

 /**

  *

  * Example implementation of persistent TopComponent.

  *

  * @author  Marek Slama

  *

  */

 class TestComponent00 extends TopComponent {

     static final long serialVersionUID = 6021472310161712674L;

     private static TestComponent00 component = null;

     private static final String TC_ID = "test03tc00";

     private JButton button;

     private boolean isGUICreated = false;

     private TestComponent00() {

         setName(NbBundle.getMessage(TestComponent00.class, "LBL_Tab_Title00"));

     }

     private void initGUI () {

         setLayout(new BorderLayout());

         button = new JButton(getName());

         add(button);

         isGUICreated = true;

     }

     protected void componentShowing () {

         if (!isGUICreated) {

             initGUI();

         }

     }

     protected String preferredID () {

         return TC_ID;

     }

     /* Singleton accessor. As TestComponent00 is persistent singleton this

      * accessor makes sure that TestComponent00 is deserialized by window system.

      * Uses known unique TopComponent ID "test03tc00" to get TestComponent00 instance

      * from window system. "test03tc00" is name of settings file defined in module layer.

      * For example ShowTestAction00 uses this method to create instance if necessary.

      */

     public static synchronized TestComponent00 findDefault() {

         if (component == null) {

             //If settings file is correctly defined call of WindowManager.findTopComponent() will

             //call TestComponent00.getDefault() and it will set static field component.

             TopComponent tc = WindowManager.getDefault().findTopComponent(TC_ID);

             if (tc != null) {

                 if (!(tc instanceof TestComponent00)) {

                     //This should not happen. Possible only if some other module

                     //defines different settings file with the same name but different class.

                     //Incorrect settings file?

                     IllegalStateException exc = new IllegalStateException

                     ("Incorrect settings file. Unexpected class returned." // NOI18N

                     + " Expected:" + TestComponent00.class.getName() // NOI18N

                     + " Returned:" + tc.getClass().getName()); // NOI18N

                     ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, exc);

                     //Fallback to accessor reserved for window system.

                     TestComponent00.getDefault();

                 }

             } else {

                 //This should not happen when settings file is correctly defined in module layer.

                 //TestComponent00 cannot be deserialized

                 //Fallback to accessor reserved for window system.

                 ErrorManager.getDefault().log(ErrorManager.WARNING,

                 "Cannot deserialize TopComponent for tcID:'" + TC_ID + "'"); // NOI18N

                 TestComponent00.getDefault();

             }

         }

         return component;

     }

     /* Singleton accessor reserved for window system ONLY. Used by window system to create

      * TestComponent00 instance from settings file when method is given. Use <code>findDefault</code>

      * to get correctly deserialized instance of TestComponent00. */

     public static synchronized TestComponent00 getDefault() {

         if (component == null) {

             component = new TestComponent00();

         }

         return component;

     }

     /** Overriden to explicitely set persistence type of TestComponent00

      * to PERSISTENCE_ALWAYS */

     public int getPersistenceType() {

         return TopComponent.PERSISTENCE_ALWAYS;

     }

     /** Resolve to singleton instance */

     public Object readResolve() throws java.io.ObjectStreamException {

         return TestComponent00.getDefault();

     }

     static void clearRef () {

         component = null;

     }

     public void requestFocus(){

         super.requestFocus();

         button.requestFocus();

     }

     public boolean requestFocusInWindow(){

         super.requestFocusInWindow();

         return button.requestFocusInWindow();

     }

 }