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1   /*
2    *  XNap - A P2P framework and client.
3    *
4    *  See the file AUTHORS for copyright information.
5    *
6    *  This program is free software; you can redistribute it and/or modify
7    *  it under the terms of the GNU General Public License as published by
8    *  the Free Software Foundation.
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  
20  package org.xnap.pkg;
21  
22  import java.util.Iterator;
23  
24  /***
25   */
26  public interface DependencyNode
27  {
28  
29      //--- Method(s) ---
30  
31  	Iterator children();
32  
33  	Object getID();
34  
35  	boolean isRequired();
36  
37  	/***
38  	 * Marks the node as required.
39  	 *
40  	 * @return true, if all dependencies are satisfied; false, otherwise
41  	 */
42  	void require(boolean requireInstalled)
43  		throws UnsatisfiedDependenciesException;
44  
45  	/***
46  	 * Marks the node as required. Does not check the dependencies.
47  	 */
48  	void setRequired(boolean required);
49  
50  }
51