org.cagrid.gaards.websso.utils.ObjectFactory.java Source code

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Here is the source code for org.cagrid.gaards.websso.utils.ObjectFactory.java

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/*
* Copyright ScenPro, Inc and SemanticBits, LLC
* 
* Distributed under the OSI-approved BSD 3-Clause License.
* See http://ncip.github.com/labviewer/LICENSE.txt for details.
*/
package org.cagrid.gaards.websso.utils;

import org.apache.log4j.Logger;
import org.cagrid.gaards.websso.exception.AuthenticationConfigurationException;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

/**
 * A simple object factory which retrieves objects from the pre-configured factory
 * 
 */
public class ObjectFactory {
    private static Logger log = Logger.getLogger(ObjectFactory.class.getName());

    private static XmlBeanFactory factory;

    private static Boolean initialized = false;

    private static Object lock = new Object();

    private ObjectFactory() {
    }

    /**
     * Initializes the object factory from the <code>fileName</code> parameter
     * 
     * @param fileName Name of the file which contains the configuration for the WebSSO
     */
    public static void initialize(String fileName) {
        synchronized (lock) {
            if (!initialized) {
                initialized = true;
                factory = new XmlBeanFactory(new ClassPathResource(fileName));
            }
        }
    }

    /**
     * Get Object instance from the classname.
     * 
     * @param key Key representing the class (bean) to be retrieved as configured in the configuration file
     * @return the instance of the class.
     * @throws ApplicationException 
     */

    public static Object getObject(String key) throws AuthenticationConfigurationException {

        if (!initialized)
            throw new RuntimeException("Object factory not initialized; can not retrieve the Class");

        try {
            return factory.getBean(key);
        } catch (Exception e) {
            log.debug("No Class found for key = " + key + "\n");
            throw new AuthenticationConfigurationException("No Class found for key = " + key + "\n", e);
        }
    }

}