/interpreter/tags/at2dist110511/src/edu/vub/at/objects/natives/NATFieldSelection.java
Java | 113 lines | 61 code | 10 blank | 42 comment | 1 complexity | bf54737b67f9251f9edd78ab0f331d69 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * NATFieldSelection.java created on 31-jul-2006 at 12:40:42 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 java.util.LinkedList; 31import java.util.Set; 32import java.util.Vector; 33 34import edu.vub.at.exceptions.InterpreterException; 35import edu.vub.at.objects.ATFieldSelection; 36import edu.vub.at.objects.ATMessage; 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.util.TempFieldGenerator; 43 44/** 45 * Instances of this class represent first-class field selections. 46 * They encapsulate a selector and may be turned into an actual field access by invoking meta_sendTo. 47 * This method provides the invocation with a receiver to apply itself to. 48 * 49 * @author tvcutsem 50 */ 51public final class NATFieldSelection extends NATMessage implements ATFieldSelection { 52 53 public NATFieldSelection(ATSymbol sel, ATTable annotations) throws InterpreterException { 54 super(sel, NATTable.EMPTY, annotations, NativeTypeTags._FIELDSEL_); 55 } 56 57 /** 58 * Copy constructor. 59 */ 60 private NATFieldSelection(FieldMap map, 61 Vector state, 62 LinkedList originalCustomFields, 63 MethodDictionary methodDict, 64 ATObject dynamicParent, 65 ATObject lexicalParent, 66 byte flags, 67 ATTypeTag[] types, 68 Set freeVars) throws InterpreterException { 69 super(map, state, originalCustomFields, methodDict, dynamicParent, lexicalParent, flags, types, freeVars); 70 } 71 72 /** 73 * To evaluate a field selection, invoke a field accessor method on the receiver. 74 * 75 * @return the return value of the invoked method. 76 */ 77 public ATObject prim_sendTo(ATMessage self, ATObject receiver, ATObject sender) throws InterpreterException { 78 return receiver.meta_invokeField(receiver, self.base_selector()); 79 } 80 81 public NATText meta_print() throws InterpreterException { 82 return NATText.atValue("<field selection:"+base_selector().toString()+">"); 83 } 84 85 public NATText impl_asCode(TempFieldGenerator objectMap) throws InterpreterException { 86 if (objectMap.contains(this)) { 87 return objectMap.getName(this); 88 } 89 NATText name = objectMap.put(this, NATText.atValue("." + base_selector().meta_print().javaValue)); 90 return name; 91 } 92 93 protected NATObject createClone(FieldMap map, 94 Vector state, 95 LinkedList originalCustomFields, 96 MethodDictionary methodDict, 97 ATObject dynamicParent, 98 ATObject lexicalParent, 99 byte flags, 100 ATTypeTag[] types, 101 Set freeVars) throws InterpreterException { 102 return new NATFieldSelection(map, 103 state, 104 originalCustomFields, 105 methodDict, 106 dynamicParent, 107 lexicalParent, 108 flags, 109 types, 110 freeVars); 111 } 112 113}