1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.objects;
  27 
  28 import jdk.nashorn.internal.objects.annotations.Function;
  29 import jdk.nashorn.internal.objects.annotations.ScriptClass;
  30 import jdk.nashorn.internal.runtime.PropertyMap;
  31 import jdk.nashorn.internal.runtime.ScriptRuntime;
  32 import jdk.nashorn.internal.runtime.Undefined;
  33 
  34 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
  35 
  36 /**
  37  * ECMA6 23.2.5 Set Iterator Objects
  38  */
  39 @ScriptClass("SetIterator")
  40 public class SetIterator extends AbstractIterator {
  41 
  42     // initialized by nasgen
  43     private static PropertyMap $nasgenmap$;
  44 
  45     private LinkedMap.LinkedMapIterator iterator;
  46 
  47     private final IterationKind iterationKind;
  48 
  49     // Cached global needed for every iteration result
  50     private final Global global;
  51 
  52     SetIterator(final NativeSet set, final IterationKind iterationKind, final Global global) {
  53         super(global.getSetIteratorPrototype(), $nasgenmap$);
  54         this.iterator = set.getJavaMap().getIterator();
  55         this.iterationKind = iterationKind;
  56         this.global = global;
  57     }
  58 
  59     /**
  60      * ES6 23.2.5.2.1 %SetIteratorPrototype%.next()
  61      *
  62      * @param self the self reference
  63      * @param arg the argument
  64      * @return the next result
  65      */
  66     @Function
  67     public static Object next(final Object self, final Object arg) {
  68         if (!(self instanceof SetIterator)) {
  69             throw typeError("not.a.set.iterator", ScriptRuntime.safeToString(self));
  70         }
  71         return ((SetIterator)self).next(arg);
  72     }
  73 
  74     @Override
  75     public String getClassName() {
  76         return "Set Iterator";
  77     }
  78 
  79     @Override
  80     protected  IteratorResult next(final Object arg) {
  81         if (iterator == null) {
  82             return makeResult(Undefined.getUndefined(), Boolean.TRUE, global);
  83         }
  84 
  85         final LinkedMap.Node node = iterator.next();
  86 
  87         if (node == null) {
  88             iterator = null;
  89             return makeResult(Undefined.getUndefined(), Boolean.TRUE, global);
  90         }
  91 
  92         if (iterationKind == IterationKind.KEY_VALUE) {
  93             final NativeArray array = new NativeArray(new Object[] {node.getKey(), node.getKey()});
  94             return makeResult(array, Boolean.FALSE, global);
  95         }
  96 
  97         return makeResult(node.getKey(), Boolean.FALSE, global);
  98     }
  99 }