package ch.werner_randelshofer.activation;

/*
Copyright (C) 1999-99 Werner Randelshofer
werner.randelshofer@mythen.ch
http://www.mythen.ch/w.randelshofer/
    
Permission to use this release of DefaultCommandMap is hereby
granted without fee provided that the complete copyright
notice and this permission notice appear in all copies
and in supporting documentation.
*/

import javax.activation.CommandMap;
import javax.activation.CommandInfo;
import javax.activation.DataContentHandler;
import java.util.Hashtable;

/**
Default implementation of a CommandMap.
The CommandInfo objects are explicitly added to the map.

@author	Werner Randelshofer, Staldenmattweg 2, CH-6405 Immensee, Switzerland.
@version	1998-02-27	Created.
*/
public class DefaultCommandMap
extends CommandMap
	{
	Hashtable map_ = new Hashtable();
	
	/**
	Adds a command info object to the map.
	*/
	public void addCommandInfo(String mimeType, CommandInfo info)
		{
		CommandInfo[] entry = (CommandInfo[])map_.get(mimeType);
		if (entry == null)
			{
			map_.put(mimeType,new CommandInfo[]Ê{ info });
			}
		else
			{
			CommandInfo[] entry2 = new CommandInfo[entry.length+1];
			System.arraycopy(entry,0,entry2,0,entry.length);
			entry2[entry.length] = info;
			map_.put(mimeType,entry2);
			}
		}
	/**
	Get the preferred command list from a MIME Type.
	The actual semantics are determined by the implementation of the CommandMap.

	@return the CommandInfo classes the represent the command Beans.
	*/
	public CommandInfo[] getPreferredCommands(String mimeType)
		{ return getAllCommands(mimeType); }
	/**
	Get all the available commands for this type.
	This method should return all the possible commands for this
	MIME type.

	@return returns the CommandInfo objects representing all the commands.
	*/
	public CommandInfo[] getAllCommands(String mimeType)
		{
		return (CommandInfo[])map_.get(mimeType);
		}

	/**
	Get the default command corresponding to
	the MIME type.

	@return the CommandInfo corresponding to the command.
	*/
	public CommandInfo getCommand(String mimeType, String cmdName)
		{
		CommandInfo[] entry = (CommandInfo[])map_.get(mimeType);
		if (entry != null)
			{
			for (int i=0; i < entry.length; i++)
				{
				if (entry[i].getCommandName().equals(cmdName)
					{ return entry[i]; }
				}
			}
		return null;
		}

	/**
	Locate a DataContentHandler that corresponds to the MIME type.
	The mechanism and semantics for determining this are determined by
	the implementation of the particular CommandMap.
    */
	public DataContentHandler createDataContentHandler(String mimeType)
		{
		return null; // is this acceptable?
		}
	}