/interpreter/tags/at2-build270707/src/edu/vub/at/exceptions/signals/Signal.java

 1/**
 2 * AmbientTalk/2 Project
 3 * Signal.java created on 31-okt-2006 at 12:29:13
 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.signals;
29
30/**
31 * @author tvcutsem
32 *
33 * Signal is the abstract superclass of all AT/2 interpreter Signals.
34 * 
35 * Signals are exceptions which *cannot* be caught at the AmbientTalk base-level.
36 * They cannot even be caught at the meta-level, but are accessible to the implementation only.
37 * 
38 * Signals pervade the AT/2 interpreter, which is why they are declared to be unchecked exceptions,
39 * i.e. they subclass RuntimeException. This signifies that these exceptions should always be
40 * caught by the lowest-level evaluation loops in the runtime, such that they cannot cause the
41 * interpreter to crash unexpectedly.
42 */
43public abstract class Signal extends RuntimeException {
44
45}