ApplicationContextSingleton.java

/*
 * Copyright 2007 The Fornax Project Team, including the original 
 * author or authors.
 * 
 * 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.sculptor.framework.util;

import java.util.HashMap;
import java.util.Map;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ApplicationContextSingleton {

    private static String DEFAULT_SPRING_CONFIG_FILE_LOCATION = "/applicationContext-test.xml";

    private static ApplicationContextSingleton instance = new ApplicationContextSingleton();

    private Map<String, ApplicationContext> applicationContexts = new HashMap<String, ApplicationContext>();

    private ApplicationContextSingleton() {
    }

    public static ApplicationContext getApplicationContext(String configLocation) {
        return instance.getApplicationContextImpl(configLocation);
    }

    /**
     * Get the Spring ApplicationContext from applicationContext-test.xml
     */
    public static ApplicationContext getApplicationContext() {
        return instance.getApplicationContextImpl(DEFAULT_SPRING_CONFIG_FILE_LOCATION);
    }

    protected ApplicationContext getApplicationContextImpl(String configLocation) {
        ApplicationContext applicationContext = applicationContexts.get(configLocation);

        if (applicationContext == null) {
            applicationContext = new ClassPathXmlApplicationContext(configLocation);
            applicationContexts.put(configLocation, applicationContext);
        }

        return applicationContext;
    }

}