// **********************************************************************
//
// Copyright (c) 2003-2006 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceGridGUI.Application;

import javax.swing.JOptionPane;

import IceGrid.*;
import IceGridGUI.*;

abstract class CommunicatorChildEditor extends Editor
{  
    abstract void writeDescriptor();
    abstract boolean isSimpleUpdate();
    abstract Communicator.ChildList getChildList();

    void postUpdate() {}
    
    protected boolean applyUpdate()
    {
	Root root = _target.getRoot();
	root.disableSelectionListener();
	try
	{
	    if(_target.isEphemeral())
	    {
		Communicator.ChildList childList = getChildList();
		
		writeDescriptor();
		Object descriptor = _target.getDescriptor();
		_target.destroy(); // just removes the child
		
		try
		{
		    childList.tryAdd(descriptor);
		}
		catch(UpdateFailedException e)
		{
		    //
		    // Restore ephemeral
		    //
		    try
		    {
			childList.addChild(_target, true);
		    }
		    catch(UpdateFailedException die)
		    {
			assert false;
		    }
		    
		    JOptionPane.showMessageDialog(
			root.getCoordinator().getMainFrame(),
			e.toString(),
			"Apply failed",
			JOptionPane.ERROR_MESSAGE);
		    
		    root.setSelectedNode(_target);
		    return false;
		}
		
		//
		// Success
		//
		_target = childList.findChildWithDescriptor(descriptor);
		root.updated();
		root.setSelectedNode(_target);
	    }
	    else if(isSimpleUpdate())
	    {
		writeDescriptor();
		root.updated();
		((Communicator)_target.getParent()).getEnclosingEditable().markModified();
	    }
	    else
	    {
		//
		// Save to be able to rollback
		//
		Object savedDescriptor = ((DescriptorHolder)_target).saveDescriptor();
		Communicator.ChildList childList = getChildList();
		writeDescriptor();
		try
		{
		    childList.tryUpdate(_target);
		}
		catch(UpdateFailedException e)
		{
		    ((DescriptorHolder)_target).restoreDescriptor(savedDescriptor);
		    JOptionPane.showMessageDialog(
			root.getCoordinator().getMainFrame(),
			e.toString(),
			"Apply failed",
			JOptionPane.ERROR_MESSAGE);
		    return false;
		}
		
		//
		// Success
		//
		_target = childList.findChildWithDescriptor(_target.getDescriptor());
		root.updated();
		root.setSelectedNode(_target);
	    }
	    
	    postUpdate();

	    root.getCoordinator().getCurrentTab().showNode(_target);
	    _applyButton.setEnabled(false);
	    _discardButton.setEnabled(false);
	    return true;
	}
	finally
	{
	    root.enableSelectionListener();
	}
    }
}