/**

  * Copyright 2012 Sven Diedrichsen 

  * 

  * 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 de.jollyday.configuration.impl;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.Properties;

 import java.util.logging.Logger;

 import de.jollyday.configuration.ConfigurationProvider;

 import de.jollyday.util.ResourceUtil;

 /**

  * Provider which adds jollydays default configuration file

  * 'jollyday.properties' by reading it from the classpath by using the currents

  * threads classloader.

  * 

  * @author Sven Diedrichsen

  */

 public class DefaultConfigurationProvider implements ConfigurationProvider {

         private static final Logger LOG = Logger

                         .getLogger(DefaultConfigurationProvider.class.getName());

         /**

          * The name of the configuration file.

          */

         private static final String CONFIG_FILE = "jollyday.properties";

         /**

          * The utility to load resources.

          */

         private ResourceUtil resourceUtil = new ResourceUtil();

         /*

          * (non-Javadoc)

          * 

          * @see

          * de.jollyday.configuration.ConfigurationProvider#addConfiguration(java

          * .util.Properties)

          */

         @Override

         public Properties getProperties() {

                 Properties properties = new Properties();

                 try {

                         InputStream stream = null;

                         try {

                                 stream = resourceUtil.getResource(CONFIG_FILE).openStream();

                                 if (stream != null) {

                                         properties.load(stream);

                                 } else {

                                         LOG.warning("Could not load default properties file '"

                                                         + CONFIG_FILE + "' from classpath.");

                                 }

                         } finally {

                                 closeStream(stream);

                         }

                         return properties;

                 } catch (IOException e) {

                         throw new IllegalStateException(

                                         "Could not load default properties from classpath.", e);

                 }

         }

         private void closeStream(InputStream stream) {

                 if (stream != null) {

                         try {

                                 stream.close();

                         } catch (IOException e) {

                                 LOG.warning("Could not close configurations input stream.");

                         }

                 }

         }

 }