org.sakaiproject.metaobj.utils.ioc.ApplicationContextFactory.java Source code

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Here is the source code for org.sakaiproject.metaobj.utils.ioc.ApplicationContextFactory.java

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/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-api/api/src/java/org/sakaiproject/metaobj/utils/ioc/ApplicationContextFactory.java $
 * $Id: ApplicationContextFactory.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
 ***********************************************************************************
 *
 * Copyright (c) 2004, 2005, 2006, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.metaobj.utils.ioc;

import java.io.IOException;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Properties;
import java.util.SortedMap;
import java.util.TreeMap;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * <p>Loads the ApplicationContext from xml files listed in a property file.
 * The xml files referenced in the properties should be in the classpath.
 * The format of the property file should be as follows:</p>
 * <p/>
 * <br>1=help-config.xml
 * <br>2=help-web-config.xml
 * <br>3=home-config.xml
 * <br>...
 * <p/>
 * <p>The numbering controls the loading order of the files.  This
 * allows for overriding of beans configured in earlier xml definition files.
 * Without the numbering we can not gaurantee what order the files will load. </p>
 */
public class ApplicationContextFactory {
    private Log logger = LogFactory.getLog(this.getClass());
    private static ApplicationContextFactory factory = new ApplicationContextFactory();

    private ApplicationContextFactory() {
    }

    public static ApplicationContextFactory getInstance() {
        return factory;
    }

    /**
     * @param properties
     * @return
     */
    public ApplicationContext createContext(Properties properties) {
        try {
            return new ClassPathXmlApplicationContext(getConfigLocations(properties));
        } catch (Exception e) {
            throw new RuntimeException("problem loading ApplicationContext: " + e.getMessage(), e);
        }
    }

    public String[] getConfigLocations(Properties props) throws IOException {
        SortedMap configFiles = new TreeMap();
        for (Enumeration e = props.keys(); e.hasMoreElements();) {
            Integer key = new Integer((String) e.nextElement());
            String curFile = props.getProperty(key.toString());
            curFile = (!curFile.startsWith("/")) ? "/" + curFile : curFile;
            configFiles.put(key, curFile);
            logger.info("registering '" + curFile + "' in position " + key + " as spring bean definition file");
        }
        return convertToArray(configFiles.values());
    }

    protected String[] convertToArray(Collection collection) {
        return (String[]) collection.toArray(new String[collection.size()]);
    }
}