1 /*
   2  * Copyright (c) 2015, 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.runtime;
  27 
  28 import java.util.Collection;
  29 import java.util.List;
  30 import java.util.Set;
  31 import jdk.nashorn.api.scripting.JSObject;
  32 import jdk.nashorn.api.scripting.ScriptObjectMirror;
  33 import jdk.nashorn.internal.objects.Global;
  34 
  35 /**
  36  * A {@link ListAdapter} that also implements {@link JSObject}. Named {@code JSONListAdapter} as it is used as a
  37  * {@code JSObject} implementing the {@link List} interface, which is the expected interface to be implemented by
  38  * JSON-parsed arrays when they are handled in Java. We aren't implementing {@link JSObject} on {@link ListAdapter}
  39  * directly since that'd have implications for other uses of list adapter (e.g. interferences of JSObject default
  40  * value calculation vs. List's {@code toString()} etc.)
  41  */
  42 public final class JSONListAdapter extends ListAdapter implements JSObject {
  43     /**
  44      * Creates a new JSON list adapter.
  45      * @param obj the underlying object being exposed as a list.
  46      * @param global the home global of the underlying object.
  47      */
  48     public JSONListAdapter(final JSObject obj, final Global global) {
  49         super(obj, global);
  50     }
  51 
  52     /**
  53      * Unwraps this adapter into its underlying non-JSObject representative.
  54      * @param homeGlobal the home global for unwrapping
  55      * @return either the unwrapped object or this if it should not be unwrapped in the specified global.
  56      */
  57     public Object unwrap(final Object homeGlobal) {
  58         final Object unwrapped = ScriptObjectMirror.unwrap(obj, homeGlobal);
  59         return unwrapped != obj ? unwrapped : this;
  60     }
  61 
  62     @Override
  63     public Object call(final Object thiz, final Object... args) {
  64         return obj.call(thiz, args);
  65     }
  66 
  67     @Override
  68     public Object newObject(final Object... args) {
  69         return obj.newObject(args);
  70     }
  71 
  72     @Override
  73     public Object eval(final String s) {
  74         return obj.eval(s);
  75     }
  76 
  77     @Override
  78     public Object getMember(final String name) {
  79         return obj.getMember(name);
  80     }
  81 
  82     @Override
  83     public Object getSlot(final int index) {
  84         return obj.getSlot(index);
  85     }
  86 
  87     @Override
  88     public boolean hasMember(final String name) {
  89         return obj.hasMember(name);
  90     }
  91 
  92     @Override
  93     public boolean hasSlot(final int slot) {
  94         return obj.hasSlot(slot);
  95     }
  96 
  97     @Override
  98     public void removeMember(final String name) {
  99         obj.removeMember(name);
 100     }
 101 
 102     @Override
 103     public void setMember(final String name, final Object value) {
 104         obj.setMember(name, value);
 105     }
 106 
 107     @Override
 108     public void setSlot(final int index, final Object value) {
 109         obj.setSlot(index, value);
 110     }
 111 
 112     @Override
 113     public Set<String> keySet() {
 114         return obj.keySet();
 115     }
 116 
 117     @Override
 118     public Collection<Object> values() {
 119         return obj.values();
 120     }
 121 
 122     @Override
 123     public boolean isInstance(final Object instance) {
 124         return obj.isInstance(instance);
 125     }
 126 
 127     @Override
 128     public boolean isInstanceOf(final Object clazz) {
 129         return obj.isInstanceOf(clazz);
 130     }
 131 
 132     @Override
 133     public String getClassName() {
 134         return obj.getClassName();
 135     }
 136 
 137     @Override
 138     public boolean isFunction() {
 139         return obj.isFunction();
 140     }
 141 
 142     @Override
 143     public boolean isStrictFunction() {
 144         return obj.isStrictFunction();
 145     }
 146 
 147     @Override
 148     public boolean isArray() {
 149         return obj.isArray();
 150     }
 151 
 152     @Override @Deprecated
 153     public double toNumber() {
 154         return obj.toNumber();
 155     }
 156 
 157     @Override
 158     public Object getDefaultValue(final Class<?> hint) throws UnsupportedOperationException {
 159         return obj.getDefaultValue(hint);
 160     }
 161 }