/interpreter/tags/at2dist130208/src/edu/vub/at/exceptions/XUndefinedSlot.java

 1/**
 2 * AmbientTalk/2 Project
 3 * XUndefinedField.java created on 11-aug-2006 at 14:49:30
 4 * (c) Programming Technology Lab, 2006 - 2007
 5 * Authors: Tom Van Cutsem & Stijn Mostinckx
 6 * 
 7 * Permission is hereby granted, free of charge, to any person
 8 * obtaining a copy of this software and associated documentation
 9 * files (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use,
11 * copy, modify, merge, publish, distribute, sublicense, and/or
12 * sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following
14 * conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 */
28package edu.vub.at.exceptions;
29
30import edu.vub.at.objects.ATTypeTag;
31import edu.vub.at.objects.coercion.NativeTypeTags;
32
33/**
34 * An XUndefinedSlot exception is raised whenever a variable reference lookup fails,
35 * or a field assignment lookup fails. It generally means a variable was accessed which
36 * is not visible in the lexical scope.
37 * 
38 * @author tvc
39 */
40public final class XUndefinedSlot extends InterpreterException {
41
42	private static final long serialVersionUID = -219804926254934101L;
43
44	/**
45	 * Creates an XUndefinedSlot exception with a given message and slot name.
46	 * @param message "method" or "field" depending on whether the lexical lookup algorithm was currently considering the method dictionary or the state vector of an object 
47	 * @param fieldName the name of slot one was searching for
48	 */
49	public XUndefinedSlot(String message, String fieldName) {
50		super("Undefined " + message + ": " + fieldName);
51	}
52
53	public ATTypeTag getType() {
54		return NativeTypeTags._UNDEFINEDSLOT_;
55	}
56}