1 /*
2 * The contents of this file are subject to the BT "ZEUS" Open Source
3 * Licence (L77741), Version 1.0 (the "Licence"); you may not use this file
4 * except in compliance with the Licence. You may obtain a copy of the Licence
5 * from $ZEUS_INSTALL/licence.html or alternatively from
6 * http://www.labs.bt.com/projects/agents/zeus/licence.htm
7 *
8 * Except as stated in Clause 7 of the Licence, software distributed under the
9 * Licence is distributed WITHOUT WARRANTY OF ANY KIND, either express or
10 * implied. See the Licence for the specific language governing rights and
11 * limitations under the Licence.
12 *
13 * The Original Code is within the package zeus.*.
14 * The Initial Developer of the Original Code is British Telecommunications
15 * public limited company, whose registered office is at 81 Newgate Street,
16 * London, EC1A 7AJ, England. Portions created by British Telecommunications
17 * public limited company are Copyright 1996-9. All Rights Reserved.
18 *
19 * THIS NOTICE MUST BE INCLUDED ON ANY COPY OF THIS FILE
20 */
21
22
23 package zeus.rete.action;
24 import zeus.rete.*;
25 import zeus.concepts.fn.*;
26 import zeus.concepts.*;
27 import zeus.util.*;
28 import java.util.*;
29 import java.io.*;
30
31 /***
32
33 @author Simon Thompson
34 @since 1.1
35 */
36 public class CloseAction extends ReteAction{
37
38 /***
39 execute an action that closes a stream
40 */
41 public void executeAction (Action a, Info info) {
42 ValueFunction var = ((ValueFunction)a.head).resolve(info.getBindings());
43 if ( var == null || var.getID() != ValueFunction.ID ) {
44 Core.USER_ERROR("Cannot resolve reader/writer '" + a.head + "' in action " + a);
45 return;
46 }
47 String name = ((IdFn)var).getValue();
48
49 PrintWriter out = (PrintWriter)conflictHandler.getWriters().remove(name);
50 if ( out != null ) {
51 out.flush();
52 out.close();
53 return;
54 }
55
56 DataReader in = (DataReader)conflictHandler.getReaders().remove(name);
57 if ( in != null ) {
58 in = null;
59 return;
60 }
61
62 Core.USER_ERROR("Unknown reader/writer '" + name + "' in " + a);
63
64 }
65
66
67 }