/interpreter/tags/at2-build270707/src/edu/vub/at/objects/natives/NATMessage.java
Java | 149 lines | 77 code | 17 blank | 55 comment | 5 complexity | b2d1c5ae445bfae810ea3d12af0d4e9d 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.ATTypeTag; 37import edu.vub.at.objects.ATTable; 38import edu.vub.at.objects.coercion.NativeTypeTags; 39import edu.vub.at.objects.grammar.ATSymbol; 40import edu.vub.at.objects.mirrors.PrimitiveMethod; 41import edu.vub.at.objects.natives.grammar.AGSymbol; 42 43import java.util.LinkedList; 44import java.util.Vector; 45 46/** 47 * Instances of this class represent first-class messages. 48 * This is an abstract class, as it can be either a synchronous method invocation or an asynchronous message send. 49 * 50 * This class is a subclass of {@link NATObject}, such that its instances represent true AmbientTalk objects. 51 * 52 * @author tvcutsem 53 */ 54public abstract class NATMessage extends NATObject implements ATMessage { 55 56 private final static AGSymbol _SELECTOR_ = AGSymbol.jAlloc("selector"); 57 private final static AGSymbol _ARGUMENTS_ = AGSymbol.jAlloc("arguments"); 58 59 /** def sendTo(receiver, sender) { nil } */ 60 private static final PrimitiveMethod _PRIM_SND_ = new PrimitiveMethod( 61 AGSymbol.jAlloc("sendTo"), NATTable.atValue(new ATObject[] { AGSymbol.jAlloc("receiver"), AGSymbol.jAlloc("sender") })) { 62 private static final long serialVersionUID = -3475956316807558583L; 63 64 public ATObject base_apply(ATTable arguments, ATContext ctx) throws InterpreterException { 65 int arity = arguments.base_length().asNativeNumber().javaValue; 66 if (arity != 2) { 67 throw new XArityMismatch("sendTo", 2, arity); 68 } 69 return ctx.base_lexicalScope().asMessage().prim_sendTo( 70 ctx.base_self().asMessage(), 71 arguments.base_at(NATNumber.ONE), arguments.base_at(NATNumber.atValue(2))); 72 } 73 }; 74 75 76 /** 77 * Converts the given table of annotations into an ATTypeTag array. 78 * Each element of the annotations table is converted into a type. 79 * Moreover, because messages are isolates, the Isolate type is automatically appended to the resulting array. 80 * Also, each type of message has its own type of type, so a subtype of Message is also added. 81 */ 82 protected static ATTypeTag[] annotationsToTypes(ATTypeTag msgType, ATTable annotations) throws InterpreterException { 83 if (annotations == NATTable.EMPTY) { 84 return new ATTypeTag[] { NativeTypeTags._ISOLATE_, msgType }; 85 } 86 87 ATObject[] unwrapped = annotations.asNativeTable().elements_; 88 ATTypeTag[] fulltypes = new ATTypeTag[unwrapped.length+2]; 89 for (int i = 0; i < unwrapped.length; i++) { 90 fulltypes[i] = unwrapped[i].asTypeTag(); 91 } 92 fulltypes[unwrapped.length] = NativeTypeTags._ISOLATE_; 93 fulltypes[unwrapped.length+1] = msgType; 94 return fulltypes; 95 } 96 97 /** 98 * Construct a new message from the given selector, arguments and annotations. 99 * The annotations become this message's types. 100 * 101 * @param annotations a table of objects that should be convertible to types 102 * @param msgType a subtype of the Message type, added by subclasses to mark which kind of native message is created 103 */ 104 protected NATMessage(ATSymbol sel, ATTable arg, ATTable annotations, ATTypeTag msgType) throws InterpreterException { 105 super(annotationsToTypes(msgType, annotations)); 106 super.meta_defineField(_SELECTOR_, sel); 107 super.meta_defineField(_ARGUMENTS_, arg); 108 super.meta_addMethod(_PRIM_SND_); 109 } 110 111 /** 112 * Copy constructor. 113 */ 114 protected NATMessage(FieldMap map, 115 Vector state, 116 LinkedList originalCustomFields, 117 MethodDictionary methodDict, 118 ATObject dynamicParent, 119 ATObject lexicalParent, 120 byte flags, 121 ATTypeTag[] types) throws InterpreterException { 122 super(map, state, originalCustomFields, methodDict, dynamicParent, lexicalParent, flags, types); 123 } 124 125 public ATSymbol base_selector() throws InterpreterException { 126 return super.meta_invokeField(this, _SELECTOR_).asSymbol(); 127 } 128 129 public ATTable base_arguments() throws InterpreterException { 130 return super.meta_invokeField(this, _ARGUMENTS_).asTable(); 131 } 132 133 public ATNil base_arguments__opeql_(ATTable arguments) throws InterpreterException { 134 super.impl_invokeMutator(this, _ARGUMENTS_.asAssignmentSymbol(), NATTable.of(arguments)); 135 return OBJNil._INSTANCE_; 136 } 137 138 /** 139 * If sendTo is invoked from the Java-level directly, use 'this' as the dynamic receiver. 140 */ 141 public ATObject base_sendTo(ATObject receiver, ATObject sender) throws InterpreterException { 142 return this.prim_sendTo(this, receiver, sender); 143 } 144 145 public ATMessage asMessage() { 146 return this; 147 } 148 149}