source: trunk/LogicMail/src/org/logicprobe/LogicMail/util/PlatformUtils.java @ 501

/*-
 * Copyright (c) 2009, Derek Konigsberg
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.logicprobe.LogicMail.util;

/**
 * Common utility methods for platform support.
 */
public class PlatformUtils {
        private PlatformUtils() { }
        
        /**
         * Gets an instance of a factory class.
         * This method will throw a <tt>RuntimeException</tt> if none of
         * the provided classes could be found or instantiated.
         * 
         * @param factoryClasses Array of factory class names to try, in order.
         * @return Instance of the first class that was found.
         */
        public static Object getFactoryInstance(String[] factoryClasses) {
                // Get a class reference for the concrete factory
                Class factoryClass = null;
                for(int i=0; i<factoryClasses.length; i++) {
                        try {
                                factoryClass = Class.forName(factoryClasses[i]);
                        } catch (ClassNotFoundException e) { }
                        if(factoryClass != null) { break; }
                }
                if(factoryClass == null) {
                        throw new RuntimeException("Unable to instantiate factory");
                }
                
                // Instantiate the concrete factory
                try {
                        Object instance = factoryClass.newInstance();
                        return instance;
                } catch (InstantiationException e) {
                        throw new RuntimeException("Unable to instantiate " + factoryClass.getName());
                } catch (IllegalAccessException e) {
                        throw new RuntimeException("Unable to instantiate " + factoryClass.getName());
                }
        }
}