com.curl.orb.context.ApplicationContextFactory.java Source code

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Here is the source code for com.curl.orb.context.ApplicationContextFactory.java

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// Copyright (C) 1998-2008, Sumisho Computer Systems Corp. All Rights Reserved.

// 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 com.curl.orb.context;

import java.lang.reflect.InvocationTargetException;

import javax.servlet.ServletContext;

import org.apache.commons.logging.LogFactory;

/**
 * ApplicationContext factory.
 * 
 * @author Hitoshi Okada
 * @since 0.5
 */
public class ApplicationContextFactory {
    // reserved strings
    private final static String APPLICATION_CONTEXT_CLASS = "com.curl.orb.applicationContextClass";

    private static ApplicationContextFactory instance = null;
    private AbstractApplicationContext applicationContext = null;

    protected ApplicationContextFactory(ServletContext context) throws ApplicationContextException {
        try {
            String applicationContextClassName = context.getInitParameter(APPLICATION_CONTEXT_CLASS);
            if (applicationContextClassName != null) {
                Class<?> applicationContextClass = Class.forName(applicationContextClassName);
                applicationContext = (AbstractApplicationContext) (applicationContextClass
                        .getDeclaredConstructor(ServletContext.class).newInstance(context));
            }
        } catch (ClassNotFoundException e) {
            throw new ApplicationContextException(e);
        } catch (NoSuchMethodException e) {
            throw new ApplicationContextException(e);
        } catch (IllegalAccessException e) {
            throw new ApplicationContextException(e);
        } catch (InvocationTargetException e) {
            throw new ApplicationContextException(e);
        } catch (InstantiationException e) {
            throw new ApplicationContextException(e);
        }
        if (applicationContext == null)
            applicationContext = new ServletApplicationContext(context);
    }

    /**
     * Create new ApplicationContextFactory instance or get existed one if it exists.
     *
     * @param context ServletContext
     * @return ApplicationContextFactory instance
     */
    public static ApplicationContextFactory getInstance(ServletContext context) {
        if (ApplicationContextFactory.instance == null) {
            try {
                ApplicationContextFactory.instance = new ApplicationContextFactory(context);
            } catch (ApplicationContextException e) {
                // fatal log
                (LogFactory.getLog(ApplicationContextFactory.class)).fatal(e.getMessage(), e);
            }
        }
        return ApplicationContextFactory.instance;
    }

    /**
     * Get the application context
     * 
     * @return the application context
     */
    public AbstractApplicationContext getApplicationContext() {
        return applicationContext;
    }
}