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This is the 'backend' of Wicket Console which actually executes scripts.

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/*
 * 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.wicketstuff.console.engine;

import java.util.HashMap;
import java.util.Map;

/**
 * A factory for {@link IScriptEngine}s.
 * 
 * @author cretzel
 */
public class Engines
{

	private static Map singletons = new HashMap();

	public static IScriptEngine getSingletonInstance(final Lang lang)
	{

		if (!singletons.containsKey(lang))
		{
			singletons.put(lang, create(lang));
		}

		return singletons.get(lang);
	}

	public static IScriptEngine create(final Lang lang)
	{
		switch (lang)
		{
			case GROOVY :
				return new GroovyEngine();
			case CLOJURE :
				return new ClojureEngine();
			case SCALA :
				return new ScalaEngine();
			case JYTHON :
				return new JythonEngine();
			default :
				throw new UnsupportedOperationException("Unsupported language: " + lang);
		}
	}
}