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Java > Open Source Codes > org > objectweb > joram > shared > selectors > ClientSelector


1 /*
2  * JORAM: Java(TM) Open Reliable Asynchronous Messaging
3  * Copyright (C) 2006 ScalAgent Distributed Technologies
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or any later version.
9  *
10  * This library 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 GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18  * USA.
19  *
20  * Initial developer(s): ScalAgent Distributed Technologies
21  * Contributor(s):
22  */
23 package org.objectweb.joram.shared.selectors;
24
25 import org.objectweb.joram.shared.selectors.Checker;
26 import org.objectweb.joram.shared.selectors.Lexer;
27 import org.objectweb.joram.shared.excepts.SelectorException;
28
29 /**
30  * The <code>ClientSelector</code> class is used for checking the correctness
31  * of a selector client side.
32  */
33 public class ClientSelector {
34   /**
35    * Clients call this method to check a selector syntax.
36    *
37    * @return <code>true</code> when the syntax is ok.
38    * @exception SelectorException When the selector syntax is incorrect.
39    */
40   public static boolean checks(String JavaDoc selector) throws SelectorException
41   {
42     if (selector == null || selector.equals(""))
43       return true;
44
45     try {
46       Checker checker = new Checker(new Lexer(selector));
47       return ((Boolean JavaDoc) checker.parse().value).booleanValue();
48     } catch (SelectorException sE) {
49       throw sE;
50     } catch (Throwable JavaDoc t) {
51       throw new SelectorException("Invalid selector: " + t.getMessage());
52     }
53   }
54 }
55   
56
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