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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 */

package org.glassfish.weld.util;

import org.glassfish.weld.ACLSingletonProvider;
import org.jboss.weld.bootstrap.api.SingletonProvider;
import org.jboss.weld.bootstrap.api.helpers.TCCLSingletonProvider;

/**
 * Defines util methods for instantiating with weld
 */
public class Util {

    /**
     * Creates and returns a new instance of the specified class using a no-argument constructor
     * @param 
     * @param className
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @return 
     */
    public static  T newInstance(String className) {
        try {
            return Util.classForName(className).newInstance();
        } catch (InstantiationException e) {
            throw new IllegalArgumentException("Cannot instantiate instance of " + className + " with no-argument constructor", e);
       } catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Cannot instantiate instance of " + className + " with no-argument constructor", e);
       }
    }

    /**
     * Returns the actual class with the specified name
     * @param 
     * @param name The full name of the class i.e. java.lang.String
     * @return 
     */
    public static  Class classForName(String name) {
        try {
            if (Thread.currentThread().getContextClassLoader() != null) {
                Class c = Thread.currentThread().getContextClassLoader().loadClass(name);
                @SuppressWarnings("unchecked")
                Class clazz = (Class)  c;
                return clazz;
            } else {
                Class c = Class.forName(name);
                @SuppressWarnings("unchecked")
                Class clazz = (Class)  c;
                return clazz;
            }
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("Cannot load class for " + name, e);
        } catch (NoClassDefFoundError e) {
            throw new IllegalArgumentException("Cannot load class for " + name, e);
        }
   }

    /**
     * Starts the singleton provider for weld.
     * 
     * This will be {@link ACLSingletonProvider}
     */
    public static void initializeWeldSingletonProvider() {
        SingletonProvider.initialize(new ACLSingletonProvider());
    }

}