/interpreter/tags/at2dist220411/src/edu/vub/at/objects/natives/NATMessage.java
Java | 183 lines | 107 code | 20 blank | 56 comment | 9 complexity | 7a528818d0db16600a3e1869b289e018 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.eval.Evaluator; 31import edu.vub.at.exceptions.InterpreterException; 32import edu.vub.at.exceptions.XArityMismatch; 33import edu.vub.at.objects.ATClosure; 34import edu.vub.at.objects.ATContext; 35import edu.vub.at.objects.ATMessage; 36import edu.vub.at.objects.ATNil; 37import edu.vub.at.objects.ATObject; 38import edu.vub.at.objects.ATTable; 39import edu.vub.at.objects.ATTypeTag; 40import edu.vub.at.objects.coercion.NativeTypeTags; 41import edu.vub.at.objects.grammar.ATSymbol; 42import edu.vub.at.objects.mirrors.NativeClosure; 43import edu.vub.at.objects.mirrors.PrimitiveMethod; 44import edu.vub.at.objects.natives.grammar.AGSymbol; 45 46import java.util.LinkedList; 47import java.util.Set; 48import java.util.Vector; 49 50/** 51 * Instances of this class represent first-class messages. 52 * This is an abstract class, as it can be either a synchronous method invocation or an asynchronous message send. 53 * 54 * This class is a subclass of {@link NATObject}, such that its instances represent true AmbientTalk objects. 55 * 56 * @author tvcutsem 57 */ 58public abstract class NATMessage extends NATObject implements ATMessage { 59 60 private final static AGSymbol _SELECTOR_ = AGSymbol.jAlloc("selector"); 61 private final static AGSymbol _ARGUMENTS_ = AGSymbol.jAlloc("arguments"); 62 63 /** def sendTo(receiver, sender) { nil } */ 64 private static final PrimitiveMethod _PRIM_SND_ = new PrimitiveMethod( 65 AGSymbol.jAlloc("sendTo"), NATTable.atValue(new ATObject[] { AGSymbol.jAlloc("receiver"), AGSymbol.jAlloc("sender") })) { 66 private static final long serialVersionUID = -3475956316807558583L; 67 68 public ATObject base_apply(ATTable arguments, ATContext ctx) throws InterpreterException { 69 int arity = arguments.base_length().asNativeNumber().javaValue; 70 if (arity != 2) { 71 throw new XArityMismatch("sendTo", 2, arity); 72 } 73 return ctx.base_lexicalScope().asMessage().prim_sendTo( 74 ctx.base_receiver().asMessage(), 75 arguments.base_at(NATNumber.ONE), arguments.base_at(NATNumber.atValue(2))); 76 } 77 }; 78 79 /** def from(sender) { nil } */ 80 private static final PrimitiveMethod _PRIM_FRM_ = new PrimitiveMethod( 81 AGSymbol.jAlloc("from"), NATTable.atValue(new ATObject[] { AGSymbol.jAlloc("sender") })) { 82 private static final long serialVersionUID = -5721508425469755751L; 83 84 public ATObject base_apply(ATTable arguments, ATContext ctx) throws InterpreterException { 85 int arity = arguments.base_length().asNativeNumber().javaValue; 86 if (arity != 1) { 87 throw new XArityMismatch("from", 1, arity); 88 } 89 return ctx.base_lexicalScope().asMessage().base_from(arguments.base_at(NATNumber.ONE)); 90 } 91 }; 92 93 94 /** 95 * Converts the given table of annotations into an ATTypeTag array. 96 * Each element of the annotations table is converted into a type. 97 * Moreover, because messages are isolates, the Isolate type is automatically appended to the resulting array. 98 * Also, each type of message has its own type of type, so a subtype of Message is also added. 99 */ 100 protected static ATTypeTag[] annotationsToTypes(ATTypeTag msgType, ATTable annotations) throws InterpreterException { 101 if (annotations == NATTable.EMPTY) { 102 return new ATTypeTag[] { NativeTypeTags._ISOLATE_, msgType }; 103 } 104 105 ATObject[] unwrapped = annotations.asNativeTable().elements_; 106 ATTypeTag[] fulltypes = new ATTypeTag[unwrapped.length+2]; 107 for (int i = 0; i < unwrapped.length; i++) { 108 fulltypes[i] = unwrapped[i].asTypeTag(); 109 } 110 fulltypes[unwrapped.length] = NativeTypeTags._ISOLATE_; 111 fulltypes[unwrapped.length+1] = msgType; 112 return fulltypes; 113 } 114 115 /** 116 * Construct a new message from the given selector, arguments and annotations. 117 * The annotations become this message's types. 118 * 119 * @param annotations a table of objects that should be convertible to types 120 * @param msgType a subtype of the Message type, added by subclasses to mark which kind of native message is created 121 */ 122 protected NATMessage(ATSymbol sel, ATTable arg, ATTable annotations, ATTypeTag msgType) throws InterpreterException { 123 super(annotationsToTypes(msgType, annotations)); 124 super.meta_defineField(_SELECTOR_, sel); 125 super.meta_defineField(_ARGUMENTS_, arg); 126 super.meta_addMethod(_PRIM_SND_); 127 super.meta_addMethod(_PRIM_FRM_); 128 } 129 130 /** 131 * Copy constructor. 132 */ 133 protected NATMessage(FieldMap map, 134 Vector state, 135 LinkedList originalCustomFields, 136 MethodDictionary methodDict, 137 ATObject dynamicParent, 138 ATObject lexicalParent, 139 byte flags, 140 ATTypeTag[] types, 141 Set freeVars) throws InterpreterException { 142 super(map, state, originalCustomFields, methodDict, dynamicParent, lexicalParent, flags, types, freeVars); 143 } 144 145 public ATSymbol base_selector() throws InterpreterException { 146 return super.meta_invokeField(this, _SELECTOR_).asSymbol(); 147 } 148 149 public ATTable base_arguments() throws InterpreterException { 150 return super.meta_invokeField(this, _ARGUMENTS_).asTable(); 151 } 152 153 public ATNil base_arguments__opeql_(ATTable arguments) throws InterpreterException { 154 super.impl_invokeMutator(this, _ARGUMENTS_.asAssignmentSymbol(), NATTable.of(arguments)); 155 return Evaluator.getNil(); 156 } 157 158 public ATClosure base_from(final ATObject sender) { 159 final NATMessage msg = this; 160 return new NativeClosure(this) { 161 private static final long serialVersionUID = -5978871207209804505L; 162 public ATObject base_apply(ATTable args) throws InterpreterException { 163 ATObject[] arguments = args.asNativeTable().elements_; 164 if (arguments.length != 1) { 165 throw new XArityMismatch(msg.toString(), 1, arguments.length); 166 } 167 return msg.base_sendTo(arguments[0], sender); 168 } 169 }; 170 } 171 172 /** 173 * If sendTo is invoked from the Java-level directly, use 'this' as the dynamic receiver. 174 */ 175 public ATObject base_sendTo(ATObject receiver, ATObject sender) throws InterpreterException { 176 return this.prim_sendTo(this, receiver, sender); 177 } 178 179 public ATMessage asMessage() { 180 return this; 181 } 182 183}