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.runtime;

    27 

    28 import static jdk.nashorn.internal.lookup.Lookup.MH;

    29 

    30 import java.lang.invoke.MethodHandle;

    31 import java.lang.invoke.MethodHandles;

    32 import jdk.nashorn.internal.lookup.Lookup;

    33 

    34 /**

    35  * The SpillProperty is a subclass of AccessorProperties. Anything not in the initial property map

    36  * will end up in the embed fields of the ScriptObject or in the Spill, which currently is a growing

    37  * Object only array in ScriptObject

    38  *

    39  * @see AccessorProperty

    40  * @see ScriptObject

    41  */

    42 public final class SpillProperty extends AccessorProperty {

    43     private static final MethodHandle SPILLGETTER = MH.asType(MH.getter(MethodHandles.lookup(), ScriptObject.class, "spill", Object[].class), Lookup.GET_OBJECT_TYPE);

    44 

    45     /**

    46      * Constructor

    47      *

    48      * @param key    property key

    49      * @param flags  property flags

    50      * @param slot   property slot/index

    51      * @param getter getter for property

    52      * @param setter setter for property, or null if not configurable and writable

    53      */

    54     public SpillProperty(final String key, final int flags, final int slot, final MethodHandle getter, final MethodHandle setter) {

    55         super(key, flags, slot, getter, setter);

    56     }

    57 

    58     private SpillProperty(final SpillProperty property) {

    59         super(property);

    60     }

    61 

    62     @Override

    63     protected Property copy() {

    64         return new SpillProperty(this);

    65     }

    66 

    67     @Override

    68     public MethodHandle getGetter(final Class<?> type) {

    69         if (isSpill()) {

    70             return MH.filterArguments(super.getGetter(type), 0, SPILLGETTER);

    71         }

    72 

    73         return super.getGetter(type);

    74     }

    75 

    76     @Override

    77     public MethodHandle getSetter(final Class<?> type, final PropertyMap currentMap) {

    78         if (isSpill()) {

    79             return MH.filterArguments(super.getSetter(type, currentMap), 0, SPILLGETTER);

    80         }

    81 

    82         return super.getSetter(type, currentMap);

    83     }

    84 

    85 }