/interpreter/tags/at2dist090708/src/edu/vub/at/exceptions/signals/SignalEscape.java
Java | 60 lines | 12 code | 7 blank | 41 comment | 0 complexity | 34fbf63c57ffe4de7437d303cddc21fc MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * SignalEscape.java created on 31-okt-2006 at 12:31:43 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 30import edu.vub.at.objects.ATClosure; 31import edu.vub.at.objects.ATObject; 32 33/** 34 * A SignalEscape signal exception is raised whenever the 'quit' function of an escape block 35 * is invoked. It causes control of the interpreter to return to the invocation of the escape block. 36 * In other words, SignalEscape 'abuses' the Java exception handling mechanism to perform a non-local return. 37 * 38 * @author tvcutsem 39 */ 40public class SignalEscape extends Signal { 41 42 private static final long serialVersionUID = -4808396148074816408L; 43 44 /** The block which the escape command jumps out of */ 45 public ATClosure originatingBlock; 46 47 /** the value being return via the escape function */ 48 public ATObject returnedValue; 49 50 /** 51 * Constructor creating an Escape signal to prematurely exit a block and return a specific value. 52 * @param originatingBlock the current block one is jumping from. 53 * @param returnedValue the value being returned. 54 */ 55 public SignalEscape(ATClosure originatingBlock, ATObject returnedValue) { 56 this.originatingBlock = originatingBlock; 57 this.returnedValue = returnedValue; 58 } 59 60}