J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.script.javascript; |
| 27 | |
| 28 | import javax.script.Invocable; |
| 29 | import sun.org.mozilla.javascript.internal.*; |
| 30 | |
| 31 | /** |
| 32 | * This class implements Rhino-like JavaAdapter to help implement a Java |
| 33 | * interface in JavaScript. We support this using Invocable.getInterface. |
| 34 | * Using this JavaAdapter, script author could write: |
| 35 | * |
| 36 | * var r = new java.lang.Runnable() { |
| 37 | * run: function() { script... } |
| 38 | * }; |
| 39 | * |
| 40 | * r.run(); |
| 41 | * new java.lang.Thread(r).start(); |
| 42 | * |
| 43 | * Note that Rhino's JavaAdapter support allows extending a Java class and/or |
| 44 | * implementing one or more interfaces. This JavaAdapter implementation does |
| 45 | * not support these. |
| 46 | * |
| 47 | * @author A. Sundararajan |
| 48 | * @since 1.6 |
| 49 | */ |
| 50 | final class JavaAdapter extends ScriptableObject implements Function { |
| 51 | private JavaAdapter(Invocable engine) { |
| 52 | this.engine = engine; |
| 53 | } |
| 54 | |
| 55 | static void init(Context cx, Scriptable scope, boolean sealed) |
| 56 | throws RhinoException { |
| 57 | RhinoTopLevel topLevel = (RhinoTopLevel) scope; |
| 58 | Invocable engine = topLevel.getScriptEngine(); |
| 59 | JavaAdapter obj = new JavaAdapter(engine); |
| 60 | obj.setParentScope(scope); |
| 61 | obj.setPrototype(getFunctionPrototype(scope)); |
| 62 | /* |
| 63 | * Note that we can't use defineProperty. A property of this |
| 64 | * name is already defined in Context.initStandardObjects. We |
| 65 | * simply overwrite the property value! |
| 66 | */ |
| 67 | ScriptableObject.putProperty(topLevel, "JavaAdapter", obj); |
| 68 | } |
| 69 | |
| 70 | public String getClassName() { |
| 71 | return "JavaAdapter"; |
| 72 | } |
| 73 | |
| 74 | public Object call(Context cx, Scriptable scope, Scriptable thisObj, |
| 75 | Object[] args) throws RhinoException { |
| 76 | return construct(cx, scope, args); |
| 77 | } |
| 78 | |
| 79 | public Scriptable construct(Context cx, Scriptable scope, Object[] args) |
| 80 | throws RhinoException { |
| 81 | if (args.length == 2) { |
| 82 | Class<?> clazz = null; |
| 83 | Object obj1 = args[0]; |
| 84 | if (obj1 instanceof Wrapper) { |
| 85 | Object o = ((Wrapper)obj1).unwrap(); |
| 86 | if (o instanceof Class && ((Class)o).isInterface()) { |
| 87 | clazz = (Class) o; |
| 88 | } |
| 89 | } else if (obj1 instanceof Class) { |
| 90 | if (((Class)obj1).isInterface()) { |
| 91 | clazz = (Class) obj1; |
| 92 | } |
| 93 | } |
| 94 | if (clazz == null) { |
| 95 | throw Context.reportRuntimeError("JavaAdapter: first arg should be interface Class"); |
| 96 | } |
| 97 | |
| 98 | Scriptable topLevel = ScriptableObject.getTopLevelScope(scope); |
| 99 | return cx.toObject(engine.getInterface(args[1], clazz), topLevel); |
| 100 | } else { |
| 101 | throw Context.reportRuntimeError("JavaAdapter requires two arguments"); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | private Invocable engine; |
| 106 | } |