001    /**
002     * Copyright 2005-2013 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.ken.util;
017    
018    import java.io.IOException;
019    import java.util.Properties;
020    
021    import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
022    import org.springframework.core.io.FileSystemResourceLoader;
023    import org.springframework.core.io.Resource;
024    import org.springframework.util.DefaultPropertiesPersister;
025    
026    /**
027     * PropertyPlaceholderConfigurer subclass that overrides any statically defined properties and properties locations,
028     * with configuration settings from a properties file specified in a System property.
029     * @see PropertyPlaceholderConfigurer
030     * @author Kuali Rice Team (rice.collab@kuali.org)
031     */
032    public class NotificationPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
033        private static final String CFG_LOCATION_PROPERTY = "notification.config";
034    
035        /**
036         * @see org.springframework.core.io.support.PropertiesLoaderSupport#mergeProperties()
037         */
038        @Override
039        protected Properties mergeProperties() throws IOException {
040            Properties properties = super.mergeProperties();
041            return transformProperties(properties);
042        }
043    
044        /**
045         * This method consolidates config properties.
046         * @param properties
047         * @return Properties
048         * @throws IOException
049         */
050        protected Properties transformProperties(Properties properties) throws IOException {
051            String cfgLocation = System.getProperty(CFG_LOCATION_PROPERTY);
052    
053            if (cfgLocation != null) {
054                Resource resource = new FileSystemResourceLoader().getResource(cfgLocation);
055                if (resource != null && resource.exists()) {
056                    new DefaultPropertiesPersister().load(properties, resource.getInputStream());
057                }
058            }
059            
060            return properties;
061        }
062    
063        /* I would have liked to just dynamically add a new Resource to the list of resource locations and
064         * delegate entirely to the superclass hierarchy for loading, but unfortunately the locations member
065         * is inaccessible, so we have to load the properties into the existing properties object ourselves,
066         * in the process overridding any existing entries
067         */
068    //    public void afterPropertiesSet() throws Exception {
069    //        String cfg = System.getProperty(CFG_LOCATION_PROPERTY);
070    //        if (cfg == null) return;
071    //        
072    //        Resource resource = new FileSystemResourceLoader().getResource(cfg);
073    //        // add resource to locations
074    //    }
075    }