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1   // ////////////////////////////////////////////////////////////////////////////
2   // dexterIM - Instant Messaging Framework
3   // Copyright (C) 2003 Christoph Walcher
4   //
5   // This program is free software; you can redistribute it and/or modify
6   // it under the terms of the GNU General Public License as published by
7   // the Free Software Foundation; either version 2 of the License, or
8   // (at your option) any later version.
9   //
10  // This program is distributed in the hope that it will be useful,
11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  // GNU General Public License for more details.
14  //
15  // You should have received a copy of the GNU General Public License
16  // along with this program; if not, write to the Free Software
17  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  //////////////////////////////////////////////////////////////////////////////
19  package net.sf.dexterim.oscar.entity;
20  
21  
22  /*** Flyweight Class that abstracts ICQ and AIM dialects of OSCAR.
23   * @author christoph
24   */
25  public class ProtocolDialect {
26  	private static ProtocolDialect icq;
27  	private static ProtocolDialect aim;
28  	
29  	private Capabilities capabilities;
30  	
31  	private ProtocolDialect(Capabilities capabilities) {
32  		this.capabilities = capabilities;
33  	}
34  	
35  	public Capabilities getCapabilities() {
36  		return capabilities;
37  	}
38  	
39  	/***
40  	 * Returns the single instance of ICQ dialect. These instances can be compared 
41  	 * by identity using == or by value using equal.
42  	 * @return ICQ Dialect
43  	 */
44  	public static synchronized ProtocolDialect buildICQDialect() {
45  		if (icq == null) {
46  			Capabilities caps = CapabilitiesBuilder.getInstance().buildCapabilities("icq");
47  		
48  			icq = new ProtocolDialect(caps);
49  		}
50  		
51  		return aim;
52  	}
53  	
54  	/***
55  	 * Returns the single instance of AIM dialect. These instances can be compared 
56  	 * by identity using == or by value using equal.
57  	 * @return Oscar Dialect
58  	 */
59  	public static synchronized ProtocolDialect buildAIMDialect() {
60  		if (aim == null) {
61  			Capabilities caps = CapabilitiesBuilder.getInstance().buildCapabilities("aim");
62  		
63  			aim = new ProtocolDialect(caps);
64  		}
65  		
66  		return aim;
67  	}
68  }