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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2010, 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 com.sun.script.javascript; | ||
| 27 | |||
| 28 | import sun.org.mozilla.javascript.internal.*; | ||
| 29 | import javax.script.*; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * This class serves as top level scope for Rhino. This class adds | ||
| 33 | * 3 top level functions (bindings, scope, sync) and two constructors | ||
| 34 | * (JSAdapter, JavaAdapter). | ||
| 35 | * | ||
| 36 | * @author A. Sundararajan | ||
| 37 | * @since 1.6 | ||
| 38 | */ | ||
| 39 | public final class RhinoTopLevel extends ImporterTopLevel { | ||
| 40 | RhinoTopLevel(Context cx, RhinoScriptEngine engine) { | ||
| 41 | super(cx); | ||
| 42 | this.engine = engine; | ||
| 43 | |||
| 44 | |||
| 45 | // initialize JSAdapter lazily. Reduces footprint & startup time. | ||
| 46 | new LazilyLoadedCtor(this, "JSAdapter", | ||
| 47 | "com.sun.script.javascript.JSAdapter", | ||
| 48 | false); | ||
| 49 | |||
| 50 | /* | ||
| 51 | * initialize JavaAdapter. We can't lazy initialize this because | ||
| 52 | * lazy initializer attempts to define a new property. But, JavaAdapter | ||
| 53 | * is an exisiting property that we overwrite. | ||
| 54 | */ | ||
| 55 | JavaAdapter.init(cx, this, false); | ||
| 56 | |||
| 57 | // add top level functions | ||
| 58 | String names[] = { "bindings", "scope", "sync" }; | ||
| 59 | defineFunctionProperties(names, RhinoTopLevel.class, | ||
| 60 | ScriptableObject.DONTENUM); | ||
| 61 | } | ||
| 62 | |||
| 63 | /** | ||
| 64 | * The bindings function takes a JavaScript scope object | ||
| 65 | * of type ExternalScriptable and returns the underlying Bindings | ||
| 66 | * instance. | ||
| 67 | * | ||
| 68 | * var page = scope(pageBindings); | ||
| 69 | * with (page) { | ||
| 70 | * // code that uses page scope | ||
| 71 | * } | ||
| 72 | * var b = bindings(page); | ||
| 73 | * // operate on bindings here. | ||
| 74 | */ | ||
| 75 | public static Object bindings(Context cx, Scriptable thisObj, Object[] args, | ||
| 76 | Function funObj) { | ||
| 77 | if (args.length == 1) { | ||
| 78 | Object arg = args[0]; | ||
| 79 | if (arg instanceof Wrapper) { | ||
| 80 | arg = ((Wrapper)arg).unwrap(); | ||
| 81 | } | ||
| 82 | if (arg instanceof ExternalScriptable) { | ||
| 83 | ScriptContext ctx = ((ExternalScriptable)arg).getContext(); | ||
| 84 | Bindings bind = ctx.getBindings(ScriptContext.ENGINE_SCOPE); | ||
| 85 | return Context.javaToJS(bind, | ||
| 86 | ScriptableObject.getTopLevelScope(thisObj)); | ||
| 87 | } | ||
| 88 | } | ||
| 89 | return cx.getUndefinedValue(); | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * The scope function creates a new JavaScript scope object | ||
| 94 | * with given Bindings object as backing store. This can be used | ||
| 95 | * to create a script scope based on arbitrary Bindings instance. | ||
| 96 | * For example, in webapp scenario, a 'page' level Bindings instance | ||
| 97 | * may be wrapped as a scope and code can be run in JavaScripe 'with' | ||
| 98 | * statement: | ||
| 99 | * | ||
| 100 | * var page = scope(pageBindings); | ||
| 101 | * with (page) { | ||
| 102 | * // code that uses page scope | ||
| 103 | * } | ||
| 104 | */ | ||
| 105 | public static Object scope(Context cx, Scriptable thisObj, Object[] args, | ||
| 106 | Function funObj) { | ||
| 107 | if (args.length == 1) { | ||
| 108 | Object arg = args[0]; | ||
| 109 | if (arg instanceof Wrapper) { | ||
| 110 | arg = ((Wrapper)arg).unwrap(); | ||
| 111 | } | ||
| 112 | if (arg instanceof Bindings) { | ||
| 113 | ScriptContext ctx = new SimpleScriptContext(); | ||
| 114 | ctx.setBindings((Bindings)arg, ScriptContext.ENGINE_SCOPE); | ||
| 115 | Scriptable res = new ExternalScriptable(ctx); | ||
| 116 | res.setPrototype(ScriptableObject.getObjectPrototype(thisObj)); | ||
| 117 | res.setParentScope(ScriptableObject.getTopLevelScope(thisObj)); | ||
| 118 | return res; | ||
| 119 | } | ||
| 120 | } | ||
| 121 | return cx.getUndefinedValue(); | ||
| 122 | } | ||
| 123 | |||
| 124 | /** | ||
| 125 | * The sync function creates a synchronized function (in the sense | ||
| 126 | * of a Java synchronized method) from an existing function. The | ||
| 127 | * new function synchronizes on the <code>this</code> object of | ||
| 128 | * its invocation. | ||
| 129 | * js> var o = { f : sync(function(x) { | ||
| 130 | * print("entry"); | ||
| 131 | * Packages.java.lang.Thread.sleep(x*1000); | ||
| 132 | * print("exit"); | ||
| 133 | * })}; | ||
| 134 | * js> thread(function() {o.f(5);}); | ||
| 135 | * entry | ||
| 136 | * js> thread(function() {o.f(5);}); | ||
| 137 | * js> | ||
| 138 | * exit | ||
| 139 | * entry | ||
| 140 | * exit | ||
| 141 | */ | ||
| 142 | public static Object sync(Context cx, Scriptable thisObj, Object[] args, | ||
| 143 | Function funObj) { | ||
| 144 | if (args.length == 1 && args[0] instanceof Function) { | ||
| 145 | return new Synchronizer((Function)args[0]); | ||
| 146 | } else { | ||
| 147 | throw Context.reportRuntimeError("wrong argument(s) for sync"); | ||
| 148 | } | ||
| 149 | } | ||
| 150 | |||
| 151 | RhinoScriptEngine getScriptEngine() { | ||
| 152 | return engine; | ||
| 153 | } | ||
| 154 | |||
| 155 | private RhinoScriptEngine engine; | ||
| 156 | } | ||