/interpreter/tags/reactive-pattern-matching/src/edu/vub/at/objects/natives/NATHandler.java
Java | 79 lines | 35 code | 10 blank | 34 comment | 0 complexity | 3036b14cd150561e086b92493343f662 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * NATHandler.java created on Oct 14, 2006 at 8:06:53 AM 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.objects.natives; 29 30import edu.vub.at.exceptions.InterpreterException; 31import edu.vub.at.objects.ATBoolean; 32import edu.vub.at.objects.ATClosure; 33import edu.vub.at.objects.ATHandler; 34import edu.vub.at.objects.ATObject; 35import edu.vub.at.objects.ATTypeTag; 36import edu.vub.at.objects.ATTable; 37import edu.vub.at.objects.coercion.NativeTypeTags; 38 39/** 40 * 41 * TODO document the class NATHandler 42 * 43 * @author smostinc 44 */ 45public class NATHandler extends NATByRef implements ATHandler { 46 47 private final ATTypeTag filter_; 48 private final ATClosure handler_; 49 50 /** construct a new exception handler */ 51 public NATHandler(ATTypeTag filter, ATClosure handler) { 52 this.filter_ = filter; 53 this.handler_ = handler; 54 } 55 56 public ATBoolean base_canHandle(ATObject anException) throws InterpreterException { 57 return anException.meta_isTaggedAs(filter_); 58 } 59 60 public ATObject base_handle(ATObject anException) throws InterpreterException { 61 return handler_.base_apply(NATTable.atValue(new ATObject[] { anException })); 62 } 63 64 public ATHandler asHandler() { 65 return this; 66 } 67 68 public ATTable meta_typeTags() throws InterpreterException { 69 return NATTable.of(NativeTypeTags._HANDLER_); 70 } 71 72 public ATObject meta_clone() throws InterpreterException { 73 return this; 74 } 75 76 public NATText meta_print() throws InterpreterException { 77 return NATText.atValue("<handler for:"+filter_.toString()+">"); 78 } 79}