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The Open Source version of the IBM Toolbox for Java
///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: VEmptyNode.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2000 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.vaccess;
import javax.swing.Icon;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.TableColumnModel;
import javax.swing.tree.TreeNode;
import java.io.Serializable;
import java.util.Enumeration;
/**
The VEmptyNode class is an empty node for use in representing
a tree with no root. This is used to workaround a Swing
bug documented in AS400TreePane constructor.
**/
class VEmptyNode
implements VNode, Serializable
{
private static final String copyright = "Copyright (C) 1997-2000 International Business Machines Corporation and others.";
/**
Adds a listener to be notified when an error occurs.
@param listener The listener.
**/
public void addErrorListener (ErrorListener listener)
{
}
/**
Adds a listener to be notified when a VObject is changed,
created, or deleted.
@param listener The listener.
**/
public void addVObjectListener (VObjectListener listener)
{
}
/**
Adds a listener to be notified when work in a different thread
starts and stops.
@param listener The listener.
**/
public void addWorkingListener (WorkingListener listener)
{
}
/**
Returns the children of the node.
@return An empty enumeration.
**/
public Enumeration children ()
{
return new Enumeration () {
public boolean hasMoreElements () { return false; }
public Object nextElement () { return null; }
};
}
/**
Returns the list of actions that can be performed.
@return Always null.
**/
public VAction[] getActions ()
{
return null;
}
/**
Indiciates if the node allows children.
@returns Always true.
**/
public boolean getAllowsChildren ()
{
return true;
}
/**
Returns the child node at the specified index.
@param index The index.
@return Always null.
**/
public TreeNode getChildAt (int index)
{
return null;
}
/**
Returns the number of children.
@return Always 0.
**/
public int getChildCount ()
{
return 0;
}
/**
Returns the default action.
@return Always null.
**/
public VAction getDefaultAction ()
{
return null;
}
/**
Returns the child for the details at the specified index.
@param index The index.
@return Always null.
**/
public VObject getDetailsChildAt (int index)
{
return null;
}
/**
Returns the number of children for the details.
@returns Always 0.
**/
public int getDetailsChildCount ()
{
return 0;
}
/**
Returns the index of the specified child for the details.
@param detailsChild The detailsChild.
@return Always -1.
**/
public int getDetailsIndex (VObject detailsChild)
{
return -1;
}
/**
Returns the table column model to use in the details
when representing the children. This column model
describes the details values for the children.
@return The details column model.
**/
public TableColumnModel getDetailsColumnModel ()
{
return new DefaultTableColumnModel ();
}
/**
Returns the icon.
@param size The icon size, either 16 or 32. If any other
value is given, then return a default.
@param open true for the open icon, false for the closed
icon.
@return Always null.
**/
public Icon getIcon (int size, boolean open)
{
return null;
}
/**
Returns the index of the specified child.
@param child The child.
@return Always -1.
**/
public int getIndex (TreeNode child)
{
return -1;
}
/**
Returns the parent node.
@return Always null.
**/
public TreeNode getParent ()
{
return null;
}
/**
Returns the properties pane.
@return Always null.
**/
public VPropertiesPane getPropertiesPane ()
{
return null;
}
/**
Returns a property value.
@param propertyIdentifier The property identifier.
@return Always null.
**/
public Object getPropertyValue (Object propertyIdentifier)
{
return null;
}
/**
Returns the text. This is the name of the directory.
@return Always "".
**/
public String getText ()
{
return "";
}
/**
Indicates if the node is a leaf.
@returns Always true.
**/
public boolean isLeaf ()
{
return true;
}
/**
Indicates if the details children are sortable.
@return Always false.
**/
public boolean isSortable ()
{
return false;
}
/**
Loads the information from the server.
**/
public void load ()
{
}
/**
Removes an error listener.
@param listener The listener.
**/
public void removeErrorListener (ErrorListener listener)
{
}
/**
Removes a VObjectListener.
@param listener The listener.
**/
public void removeVObjectListener (VObjectListener listener)
{
}
/**
Removes a working listener.
@param listener The listener.
**/
public void removeWorkingListener (WorkingListener listener)
{
}
/**
Sorts the children for the details.
@param propertyIdentifiers The property identifiers. If any of
the property identifiers are null, it
means to sort using the string
representation of the object.
@param orders The sort orders for each property
identifier, true for ascending order,
false for descending order.
**/
public void sortDetailsChildren (Object[] propertyIdentifiers,
boolean[] orders)
{
}
/**
Returns the string representation. This is the name of the directory.
@return Always "".
**/
public String toString ()
{
return "";
}
}