| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.runtime; |
| |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.util.ArrayList; |
| import jdk.nashorn.internal.objects.Global; |
| |
| /** |
| * Instances of this class serve as "prototype" object for script functions. |
| * The purpose is to expose "constructor" property from "prototype". Also, nasgen |
| * generated prototype classes extend from this class. |
| */ |
| public class PrototypeObject extends ScriptObject { |
| private static final PropertyMap map$; |
| |
| private Object constructor; |
| |
| private static final MethodHandle GET_CONSTRUCTOR = findOwnMH("getConstructor", Object.class, Object.class); |
| private static final MethodHandle SET_CONSTRUCTOR = findOwnMH("setConstructor", void.class, Object.class, Object.class); |
| |
| static { |
| final ArrayList<Property> properties = new ArrayList<>(1); |
| properties.add(AccessorProperty.create("constructor", Property.NOT_ENUMERABLE, GET_CONSTRUCTOR, SET_CONSTRUCTOR)); |
| map$ = PropertyMap.newMap(properties); |
| } |
| |
| private PrototypeObject(final Global global, final PropertyMap map) { |
| super(global.getObjectPrototype(), map != map$? map.addAll(map$) : map$); |
| } |
| |
| /** |
| * Prototype constructor |
| */ |
| protected PrototypeObject() { |
| this(Global.instance(), map$); |
| } |
| |
| /** |
| * PropertyObject constructor |
| * |
| * @param map property map |
| */ |
| protected PrototypeObject(final PropertyMap map) { |
| this(Global.instance(), map); |
| } |
| |
| /** |
| * PropertyObject constructor |
| * |
| * @param func constructor function |
| */ |
| protected PrototypeObject(final ScriptFunction func) { |
| this(Global.instance(), map$); |
| this.constructor = func; |
| } |
| |
| /** |
| * Get the constructor for this {@code PrototypeObject} |
| * @param self self reference |
| * @return constructor, probably, but not necessarily, a {@link ScriptFunction} |
| */ |
| public static Object getConstructor(final Object self) { |
| return (self instanceof PrototypeObject) ? |
| ((PrototypeObject)self).getConstructor() : |
| UNDEFINED; |
| } |
| |
| /** |
| * Reset the constructor for this {@code PrototypeObject} |
| * @param self self reference |
| * @param constructor constructor, probably, but not necessarily, a {@link ScriptFunction} |
| */ |
| public static void setConstructor(final Object self, final Object constructor) { |
| if (self instanceof PrototypeObject) { |
| ((PrototypeObject)self).setConstructor(constructor); |
| } |
| } |
| |
| private Object getConstructor() { |
| return constructor; |
| } |
| |
| private void setConstructor(final Object constructor) { |
| this.constructor = constructor; |
| } |
| |
| private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) { |
| return MH.findStatic(MethodHandles.lookup(), PrototypeObject.class, name, MH.type(rtype, types)); |
| } |
| } |