/*
* 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.core.impl;
import java.io.PrintWriter;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
public class ScriptEngineConsolePlugin {
// --------- setup and shutdown
private static ScriptEngineConsolePlugin INSTANCE;
static void initPlugin(BundleContext context,
ScriptEngineManagerFactory scriptEngineManagerFactory) {
if (INSTANCE == null) {
ScriptEngineConsolePlugin tmp = new ScriptEngineConsolePlugin(
scriptEngineManagerFactory);
tmp.activate(context);
INSTANCE = tmp;
}
}
static void destroyPlugin() {
if (INSTANCE != null) {
try {
INSTANCE.deactivate();
} finally {
INSTANCE = null;
}
}
}
private ServiceRegistration serviceRegistration;
private final ScriptEngineManagerFactory scriptEngineManagerFactory;
// private constructor to force using static setup and shutdown
private ScriptEngineConsolePlugin(
ScriptEngineManagerFactory scriptEngineManagerFactory) {
this.scriptEngineManagerFactory = scriptEngineManagerFactory;
}
public String getTitle() {
return "Script Engines";
}
public void printConfiguration(final PrintWriter pw) {
pw.println("Available Script Engines");
pw.println("========================");
ScriptEngineManager manager = scriptEngineManagerFactory.getScriptEngineManager();
List<?> factories = manager.getEngineFactories();
for (Iterator<?> fi = factories.iterator(); fi.hasNext();) {
final ScriptEngineFactory factory = (ScriptEngineFactory) fi.next();
pw.println();
pw.print(factory.getEngineName());
pw.print(" ");
pw.println(factory.getEngineVersion());
pw.println("-------------------------------------");
pw.print("- Language : ");
pw.print(factory.getLanguageName());
pw.print(", ");
pw.println(factory.getLanguageVersion());
pw.print("- Extensions : ");
printArray(pw, factory.getExtensions());
pw.print("- MIME Types : ");
printArray(pw, factory.getMimeTypes());
pw.print("- Names : ");
printArray(pw, factory.getNames());
}
}
private void printArray(PrintWriter pw, List<?> values) {
if (values == null || values.size() == 0) {
pw.println("-");
} else {
for (Iterator<?> vi = values.iterator(); vi.hasNext();) {
pw.print(vi.next());
if (vi.hasNext()) {
pw.print(", ");
}
}
pw.println();
}
}
public void activate(BundleContext context) {
final Dictionary<String, Object> props = new Hashtable<String, Object>();
props.put(Constants.SERVICE_DESCRIPTION,
"Web Console Plugin for ScriptEngine implementations");
props.put(Constants.SERVICE_VENDOR, "The Apache Software Foundation");
props.put(Constants.SERVICE_PID, getClass().getName());
props.put("felix.webconsole.label", "slingscripting");
props.put("felix.webconsole.title", "Script Engines");
props.put("felix.webconsole.configprinter.modes", "always");
serviceRegistration = context.registerService(
this.getClass().getName(), this, props);
}
public void deactivate() {
if (serviceRegistration != null) {
serviceRegistration.unregister();
serviceRegistration = null;
}
}
}