/interpreter/tags/at_build150307/src/edu/vub/at/objects/natives/NATMessage.java
Java | 121 lines | 62 code | 13 blank | 46 comment | 2 complexity | cbe14cd3241a49b50cdb9550c1a684f3 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * NATMessage.java created on 31-jul-2006 at 12:31:31 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.exceptions.XArityMismatch; 32import edu.vub.at.objects.ATContext; 33import edu.vub.at.objects.ATMessage; 34import edu.vub.at.objects.ATNil; 35import edu.vub.at.objects.ATObject; 36import edu.vub.at.objects.ATStripe; 37import edu.vub.at.objects.ATTable; 38import edu.vub.at.objects.grammar.ATSymbol; 39import edu.vub.at.objects.mirrors.PrimitiveMethod; 40import edu.vub.at.objects.natives.grammar.AGSymbol; 41 42import java.util.LinkedList; 43import java.util.Vector; 44 45/** 46 * Instances of the class NATMessage represent first-class messages. 47 * A NATMessage is an abstract class, as it can be either a synchronous method invocation or an asynchronous message send. 48 * 49 * NATMessages subclass from NATIsolate, such that they represent true AmbientTalk objects. 50 * 51 * @author tvc 52 */ 53public abstract class NATMessage extends NATObject implements ATMessage { 54 55 private final static AGSymbol _SELECTOR_ = AGSymbol.jAlloc("selector"); 56 private final static AGSymbol _ARGUMENTS_ = AGSymbol.jAlloc("arguments"); 57 58 /** def sendTo(receiver, sender) { nil } */ 59 private static final PrimitiveMethod _PRIM_SND_ = new PrimitiveMethod( 60 AGSymbol.jAlloc("sendTo"), NATTable.atValue(new ATObject[] { AGSymbol.jAlloc("receiver"), AGSymbol.jAlloc("sender") })) { 61 public ATObject base_apply(ATTable arguments, ATContext ctx) throws InterpreterException { 62 int arity = arguments.base_getLength().asNativeNumber().javaValue; 63 if (arity != 2) { 64 throw new XArityMismatch("sendTo", 2, arity); 65 } 66 return ctx.base_getLexicalScope().asMessage().prim_sendTo( 67 ctx.base_getSelf().asMessage(), 68 arguments.base_at(NATNumber.ONE), arguments.base_at(NATNumber.atValue(2))); 69 } 70 }; 71 72 /** 73 * @param stripes expects that the Isolate stripe is already present in the stripes array, 74 * as well as the appropriate Message substripe! 75 */ 76 protected NATMessage(ATSymbol sel, ATTable arg, ATStripe[] stripes) throws InterpreterException { 77 super(stripes); 78 super.meta_defineField(_SELECTOR_, sel); 79 super.meta_defineField(_ARGUMENTS_, arg); 80 super.meta_addMethod(_PRIM_SND_); 81 } 82 83 /** 84 * Copy constructor. 85 */ 86 protected NATMessage(FieldMap map, 87 Vector state, 88 LinkedList originalCustomFields, 89 MethodDictionary methodDict, 90 ATObject dynamicParent, 91 ATObject lexicalParent, 92 byte flags, 93 ATStripe[] stripes) throws InterpreterException { 94 super(map, state, originalCustomFields, methodDict, dynamicParent, lexicalParent, flags, stripes); 95 } 96 97 public ATSymbol base_getSelector() throws InterpreterException { 98 return super.meta_select(this, _SELECTOR_).asSymbol(); 99 } 100 101 public ATTable base_getArguments() throws InterpreterException { 102 return super.meta_select(this, _ARGUMENTS_).asTable(); 103 } 104 105 public ATNil base_setArguments(ATTable arguments) throws InterpreterException { 106 super.meta_assignField(this, _ARGUMENTS_, arguments); 107 return NATNil._INSTANCE_; 108 } 109 110 /** 111 * If sendTo is invoked from the Java-level directly, use 'this' as the dynamic receiver. 112 */ 113 public ATObject base_sendTo(ATObject receiver, ATObject sender) throws InterpreterException { 114 return this.prim_sendTo(this, receiver, sender); 115 } 116 117 public ATMessage asMessage() { 118 return this; 119 } 120 121}