| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package freemarker.ext.rhino; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedExceptionAction; |
| |
| import org.mozilla.javascript.Scriptable; |
| import org.mozilla.javascript.Undefined; |
| import org.mozilla.javascript.UniqueTag; |
| import org.mozilla.javascript.Wrapper; |
| |
| import freemarker.ext.beans.BeansWrapper; |
| import freemarker.ext.util.ModelFactory; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.utility.UndeclaredThrowableException; |
| |
| /** |
| */ |
| public class RhinoWrapper extends BeansWrapper { |
| // The type of the "instance" field changed between Rhino versions, so a |
| // GETSTATIC with wrong type declaration would cause a NoSuchFieldError; |
| // we're avoiding it by acquiring it reflectively. |
| private static final Object UNDEFINED_INSTANCE; |
| static { |
| try { |
| UNDEFINED_INSTANCE = AccessController.doPrivileged(new PrivilegedExceptionAction() { |
| @Override |
| public Object run() throws Exception { |
| return Undefined.class.getField("instance").get(null); |
| } |
| }); |
| } catch (RuntimeException e) { |
| throw e; |
| } catch (Exception e) { |
| throw new UndeclaredThrowableException(e); |
| } |
| } |
| |
| @Override |
| public TemplateModel wrap(Object obj) throws TemplateModelException { |
| // So our existence builtins work as expected. |
| if (obj == UNDEFINED_INSTANCE || obj == UniqueTag.NOT_FOUND) { |
| return null; |
| } |
| // UniqueTag.NULL_VALUE represents intentionally set null in Rhino, and |
| // BeansWrapper#nullModel also represents intentionally returned null. |
| // I [A.Sz.] am fairly certain that this value is never passed out of |
| // any of the Rhino code back to clients, but is instead always being |
| // converted back to null. However, since this object is available to |
| // any 3rd party Scriptable implementations as well, they might return |
| // it, so we'll just be on the safe side, and handle it. |
| if (obj == UniqueTag.NULL_VALUE) { |
| return super.wrap(null); |
| } |
| // So, say, a JavaAdapter for FreeMarker interfaces works |
| if (obj instanceof Wrapper) { |
| obj = ((Wrapper) obj).unwrap(); |
| } |
| return super.wrap(obj); |
| } |
| |
| @Override |
| protected ModelFactory getModelFactory(Class clazz) { |
| if (Scriptable.class.isAssignableFrom(clazz)) { |
| return RhinoScriptableModel.FACTORY; |
| } |
| return super.getModelFactory(clazz); |
| } |
| } |