//  $Id: BondLabelRegistry.java,v 1.2 2007/02/13 19:08:41 Sasha Buzko Exp $
//
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//  History:
//  $Log: BondLabelRegistry.java,v $
//  Revision 1.2  2007/02/13 19:08:41  Sasha Buzko
//  *** empty log message ***
//
//  Revision 1.1  2006/05/20 17:02:02  Sasha Buzko
//  Updated version
//
//  Revision 1.1  2006/04/30 20:13:57  Sasha Buzko
//  New version of the app
//
//  Revision 1.1  2006/04/15 19:42:21  Sasha Buzko
//  Initial commit
//
//  Revision 1.1  2005/11/13 04:35:12  Administrator
//  *** empty log message ***
//
//  Revision 1.3  2004/04/09 00:12:53  moreland
//  Updated copyright to new UCSD wording.
//
//  Revision 1.2  2004/01/29 17:53:40  moreland
//  Updated copyright and class comment block.
//
//  Revision 1.1  2003/12/20 01:37:06  moreland
//  First implementation.
//
//  Revision 1.0  2003/12/19 23:38:39  moreland
//  First version.
//


package edu.sdsc.mbt.viewables;


import java.util.Enumeration;
import java.util.Hashtable;


/**
 *  A class used to register BondLabel implementation objects.
 *  The names of the BondLabel objects can be retrieved and
 *  used in a GUI menu in order for a user to pick the desired
 *  BondLabel algorithm. The retrieved BondLabel object may then be
 *  handed to a StructureStyle instance in order to assocate one
 *  or more Bond representations to a given label scheme.
 *  <P>
 *  @author	John L. Moreland
 *  @see	edu.sdsc.mbt.viewables.BondLabel
 *  @see	edu.sdsc.mbt.viewables.StructureStyles
 */
public class BondLabelRegistry
{
	// The registered BondLabel objects
	private static Hashtable bondLabelObjects = new Hashtable( );

	// The default BondLabel object name
	private static String defaultName = null;

	// Add the well-known BondLabel implementation names.
	static
	{
		add( BondLabelNone.NAME, BondLabelNone.create() );
		add( BondLabelByDistance.NAME, BondLabelByDistance.create() );

		defaultName = BondLabelNone.NAME;
	}

	//
	// Registration methods
	//

	/**
	 *  Return the number of registered BondLabel impelementations.
	 */
	public static int count( )
	{
		return bondLabelObjects.size( );
	}

	/**
	 *  Return the name of the default BondLabel impelementation.
	 */
	public static String getDefaultName( )
	{
		return defaultName;
	}

	/**
	 *  Add a new BondLabel implementation.
	 */
	public static void add( String name, BondLabel bondLabel )
	{
		bondLabelObjects.put( name, bondLabel );
	}

	/**
	 *  Remove an existing BondLabel implementation.
	 */
	public static void remove( String name )
	{
		bondLabelObjects.remove( name );
	}

	/**
	 *  Get an BondLabel implementation by name.
	 */
	public static BondLabel get( String name )
	{
		return (BondLabel) bondLabelObjects.get( name );
	}

	/**
	 *  Get the default BondLabel implementation.
	 */
	public static BondLabel getDefault( )
	{
		return (BondLabel) bondLabelObjects.get( defaultName );
	}

	/**
	 *  Return an Enumeration of String values for all registered
	 *  BondLabel objects.
	 */
	public static Enumeration names( )
	{
		return bondLabelObjects.keys( );
	}
}