/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

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;

/**
 *
 * @author  Marek Slama
 */

class TestComponent00 extends TopComponent {
    static final long serialVersionUID = 6021472310161712674L;
    private static TestComponent00 component = null;
    private JButton button;
    
    private TestComponent00() {
        setLayout(new BorderLayout());
        setName(NbBundle.getMessage(TestComponent00.class, "LBL_Tab_Title00"));
        button = new JButton(getName());
        add(button);
    }
    
    /* 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("test03tc00"); // NOI18N
            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.
                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 findDefault
     * 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();
    }
}