| /* |
| * 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 org.apache.sling.scripting.javascript.helper; |
| |
| import java.lang.reflect.Field; |
| |
| import org.mozilla.javascript.Context; |
| import org.mozilla.javascript.ContextFactory; |
| import org.mozilla.javascript.tools.debugger.ScopeProvider; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The <code>SlingContextFactory</code> extends the standard Rhino |
| * ContextFactory to provide customized settings, such as having the dynamic |
| * scope feature enabled by default. Other functionality, which may be added |
| * would be something like a configurable maximum script runtime value. |
| */ |
| public class SlingContextFactory extends ContextFactory { |
| |
| /** default log */ |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| private SlingRhinoDebugger debugger; |
| |
| private ScopeProvider scopeProvider; |
| |
| private boolean debuggerActive; |
| |
| private int languageVersion; |
| |
| // conditionally setup the global ContextFactory to be ours. If |
| // a global context factory has already been set, we have lost |
| // and cannot set this one. |
| public static void setup(ScopeProvider sp, int languageVersion) { |
| // TODO what do we do in the other case? debugger won't work |
| if (!hasExplicitGlobal()) { |
| initGlobal(new SlingContextFactory(sp, |
| Context.isValidLanguageVersion(languageVersion) ? languageVersion : Context.VERSION_DEFAULT)); |
| } |
| } |
| |
| public static void teardown() { |
| ContextFactory factory = getGlobal(); |
| if (factory instanceof SlingContextFactory) { |
| ((SlingContextFactory) factory).dispose(); |
| } |
| } |
| |
| // private as instances of this class are only used by setup() |
| private SlingContextFactory(ScopeProvider sp, int languageVersion) { |
| scopeProvider = sp; |
| this.languageVersion = languageVersion; |
| } |
| |
| private void dispose() { |
| // ensure the debugger is closed |
| exitDebugger(); |
| |
| // reset the context factory class for future use |
| ContextFactory newGlobal = new ContextFactory(); |
| setField(newGlobal, "hasCustomGlobal", Boolean.FALSE); |
| setField(newGlobal, "global", newGlobal); |
| setField(newGlobal, "sealed", Boolean.FALSE); |
| setField(newGlobal, "listeners", null); |
| setField(newGlobal, "disabledListening", Boolean.FALSE); |
| setField(newGlobal, "applicationClassLoader", null); |
| } |
| |
| @Override |
| protected Context makeContext() { |
| Context context = new SlingContext(); |
| context.setLanguageVersion(languageVersion); |
| return context; |
| } |
| |
| @Override |
| protected boolean hasFeature(Context cx, int featureIndex) { |
| if (featureIndex == Context.FEATURE_DYNAMIC_SCOPE) { |
| return true; |
| } |
| |
| return super.hasFeature(cx, featureIndex); |
| } |
| |
| @Override |
| protected void onContextCreated(Context cx) { |
| super.onContextCreated(cx); |
| initDebugger(cx); |
| } |
| |
| private void initDebugger(Context cx) { |
| if (isDebugging()) { |
| try { |
| if (debugger == null) { |
| debugger = new SlingRhinoDebugger( |
| getClass().getSimpleName()); |
| debugger.setScopeProvider(scopeProvider); |
| debugger.attachTo(this); |
| } |
| } catch (Exception e) { |
| log.warn("initDebugger: Failed setting up the Rhino debugger", |
| e); |
| } |
| } |
| } |
| |
| public void exitDebugger() { |
| if (debugger != null) { |
| debugger.setScopeProvider(null); |
| debugger.detach(); |
| debugger.dispose(); |
| debugger = null; |
| } |
| } |
| |
| void debuggerStopped() { |
| debugger = null; |
| } |
| |
| public void setDebugging(boolean enable) { |
| debuggerActive = enable; |
| } |
| |
| public boolean isDebugging() { |
| return debuggerActive; |
| } |
| |
| private void setField(Object instance, String fieldName, Object value) { |
| try { |
| Field field = instance.getClass().getDeclaredField(fieldName); |
| if (!field.isAccessible()) { |
| field.setAccessible(true); |
| } |
| field.set(instance, value); |
| } catch (IllegalArgumentException iae) { |
| // don't care, but it is strange anyhow |
| } catch (IllegalAccessException iae) { |
| // don't care, but it is strange anyhow |
| } catch (NoSuchFieldException nsfe) { |
| // don't care, but it is strange anyhow |
| } |
| } |
| } |