org.apache.juddi.v3.auth.AuthenticatorFactory.java Source code

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Here is the source code for org.apache.juddi.v3.auth.AuthenticatorFactory.java

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/*
 * Copyright 2001-2008 The Apache Software Foundation.
 * 
 * Licensed 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.juddi.v3.auth;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.juddi.ClassUtil;
import org.apache.juddi.config.AppConfig;
import org.apache.juddi.config.Property;

/**
 * @author Steve Viens (sviens@apache.org)
 * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
 */
public class AuthenticatorFactory {
    private static Log log = LogFactory.getLog(AuthenticatorFactory.class);

    // Default authenticator implementation
    private static final String DEFAULT_IMPL = "org.apache.juddi.v3.auth.JUDDIAuthenticator";

    // the shared Authenticator instance
    private static Authenticator auth = null;

    /**
     * Returns a new instance of a AuthenticatorFactory.
     * 
     * @return Authenticator
     */
    public static synchronized Authenticator getAuthenticator() {
        if (auth == null)
            auth = createAuthenticator();
        return auth;
    }

    /**
     * Returns a new instance of a Authenticator.
     * 
     * @return Authenticator
     */
    private static synchronized Authenticator createAuthenticator() {
        if (auth != null)
            return auth;

        String className = DEFAULT_IMPL;
        try {
            // grab class name of the Authenticator implementation to create
            className = AppConfig.getConfiguration().getString(Property.JUDDI_AUTHENTICATOR, DEFAULT_IMPL);
        } catch (ConfigurationException ce) {
            log.error("Configuration exception occurred retrieving: " + Property.JUDDI_AUTHENTICATOR);
        }

        // write the Authenticator implementation name to the log
        log.debug("Authenticator Implementation = " + className);

        Class<?> authClass = null;
        try {
            // Use Loader to locate & load the Authenticator implementation
            authClass = ClassUtil.forName(className, AuthenticatorFactory.class);
        } catch (ClassNotFoundException e) {
            log.error("The specified Authenticator class '" + className + "' was not found in classpath.");
            log.error(e);
        }

        try {
            if (authClass != null) {
                // try to instantiate the Authenticator implementation
                auth = (Authenticator) authClass.newInstance();
            } else {
                log.error("Could not load " + className + " authClass is null");
            }
        } catch (Exception e) {
            log.error("Exception while attempting to instantiate the implementation of Authenticator: " + className
                    + "\n" + e.getMessage());
            log.error(e);
        }

        return auth;
    }
}