1 /*
   2  * Copyright (c) 2010, 2013, 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.scripts;
  27 
  28 import jdk.nashorn.internal.codegen.SpillObjectCreator;
  29 import jdk.nashorn.internal.runtime.PropertyMap;
  30 import jdk.nashorn.internal.runtime.ScriptObject;
  31 
  32 /**
  33  * Empty object class.
  34  */
  35 public class JO extends ScriptObject {
  36 
  37     private static final PropertyMap map$ = PropertyMap.newMap();
  38 
  39     /**
  40      * Returns the initial property map to be used.
  41      * @return the initial property map.
  42      */
  43     public static PropertyMap getInitialMap() {
  44         return map$;
  45     }
  46 
  47     /**
  48      * Constructor given an initial property map
  49      *
  50      * @param map the property map
  51      */
  52     public JO(final PropertyMap map) {
  53         super(map);
  54     }
  55 
  56     /**
  57      * Constructor given an initial prototype and an initial property map.
  58      *
  59      * @param proto the prototype object
  60      * @param map the property map
  61      */
  62     public JO(final ScriptObject proto, final PropertyMap map) {
  63         super(proto, map);
  64     }
  65 
  66     /**
  67      * Constructor that takes a pre-initialized spill pool. Used for
  68      * by {@link SpillObjectCreator} for intializing object literals
  69      *
  70      * @param map            property map
  71      * @param primitiveSpill primitive spill pool
  72      * @param objectSpill    reference spill pool
  73      */
  74     public JO(final PropertyMap map, final long[] primitiveSpill, final Object[] objectSpill) {
  75         super(map, primitiveSpill, objectSpill);
  76     }
  77 
  78     /**
  79      * A method handle of this method is passed to the ScriptFunction constructor.
  80      *
  81      * @param map  the property map to use for allocatorMap
  82      *
  83      * @return newly allocated ScriptObject
  84      */
  85     public static ScriptObject allocate(final PropertyMap map) {
  86         return new JO(map);
  87     }
  88 }