/interpreter/tags/at2dist170907/src/edu/vub/at/objects/natives/NATMethodInvocation.java

  1/**
  2 * AmbientTalk/2 Project
  3 * NATMethodInvocation.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 edu.vub.at.eval.Evaluator;
 31import edu.vub.at.exceptions.InterpreterException;
 32import edu.vub.at.objects.ATMessage;
 33import edu.vub.at.objects.ATMethodInvocation;
 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;
 38import edu.vub.at.objects.grammar.ATSymbol;
 39
 40import java.util.LinkedList;
 41import java.util.Vector;
 42
 43/**
 44 * Instances of this class represent first-class method invocations.
 45 * They encapsulate a selector and arguments and may be turned into an actual invocation by invoking meta_sendTo.
 46 * This method provides the invocation with a receiver to apply itself to.
 47 * 
 48 * @author tvcutsem
 49 */
 50public final class NATMethodInvocation extends NATMessage implements ATMethodInvocation {
 51
 52	public NATMethodInvocation(ATSymbol sel, ATTable arg, ATTable annotations) throws InterpreterException {
 53		super(sel, arg, annotations, NativeTypeTags._METHODINV_);
 54	}
 55	
 56    /**
 57     * Copy constructor.
 58     */
 59    private NATMethodInvocation(FieldMap map,
 60            Vector state,
 61            LinkedList originalCustomFields,
 62            MethodDictionary methodDict,
 63            ATObject dynamicParent,
 64            ATObject lexicalParent,
 65            byte flags,
 66            ATTypeTag[] types) throws InterpreterException {
 67    	super(map, state, originalCustomFields, methodDict, dynamicParent, lexicalParent, flags, types);
 68    }
 69
 70	/**
 71	 * To evaluate a method invocation, invoke the method corresponding to the encapsulated
 72	 * selector to the given receiver with the encapsulated arguments.
 73	 * 
 74	 * @return the return value of the invoked method.
 75	 */
 76	public ATObject prim_sendTo(ATMessage self, ATObject receiver, ATObject sender) throws InterpreterException {
 77		return receiver.meta_invoke(receiver, self.base_selector(), self.base_arguments());
 78	}
 79	
 80	public NATText meta_print() throws InterpreterException {
 81		return NATText.atValue("<method invocation:"+base_selector()+Evaluator.printAsList(base_arguments()).javaValue+">");
 82	}
 83	
 84	protected NATObject createClone(FieldMap map,
 85			Vector state,
 86			LinkedList originalCustomFields,
 87			MethodDictionary methodDict,
 88			ATObject dynamicParent,
 89			ATObject lexicalParent,
 90			byte flags,
 91			ATTypeTag[] types) throws InterpreterException {
 92		return new NATMethodInvocation(map,
 93				state,
 94				originalCustomFields,
 95				methodDict,
 96				dynamicParent,
 97				lexicalParent,
 98				flags,
 99				types);
100	}
101	
102}