ingo@1022: /*
ingo@1022:  * Copyright (c) 2010 by Intevation GmbH
ingo@1022:  *
ingo@1022:  * This program is free software under the LGPL (>=v2.1)
ingo@1022:  * Read the file LGPL.txt coming with the software for details
ingo@1022:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@1022:  */
ingo@1022: 
tim@3: package de.intevation.gnv.propertiesreader;
tim@3: 
tim@3: import java.util.Enumeration;
tim@3: import java.util.HashMap;
tim@3: import java.util.Map;
tim@3: 
tim@3: import javax.servlet.ServletConfig;
tim@3: 
tim@3: import org.apache.log4j.Logger;
ingo@690: 
tim@3: /**
tim@960:  * This reader fetches the properties it will provide from the 
tim@960:  * <code>ServletConfig</code> of an <code>Context</code>.
tim@960:  * It will read the InitParameters which could be configured using
tim@960:  * the <code>web.xml</code-file of each <code>context</code>.
tim@960:  * 
sascha@684:  * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
sascha@681:  *
tim@3:  */
tim@3: public class ServletPropertiesReader implements PropertiesReader {
tim@3: 
tim@3:     /**
tim@3:      * the logger, used to log exceptions and additonaly information
tim@3:      */
tim@3:     private static Logger log = Logger.getLogger(ServletPropertiesReader.class);
tim@3: 
tim@960:     /**
tim@960:      * The properties which are read from the <code>ServletConfig</code>.
tim@960:      */
tim@36:     private Map<String, String> properties = null;
tim@36: 
tim@3:     /**
tim@3:      * Constructor
tim@960:      * 
tim@960:      * @param config the <code>ServletConfig</code> where 
tim@960:      *               the properties should be read from.
tim@3:      */
tim@3:     public ServletPropertiesReader(ServletConfig config) {
tim@3:         super();
tim@3:         log.info("ServletPropertiesReader will be initialized");
tim@36:         if (config != null) {
tim@36: 
tim@3:             Enumeration<String> keys = config.getInitParameterNames();
tim@3:             properties = new HashMap<String, String>();
tim@36:             while (keys.hasMoreElements()) {
tim@3:                 String key = keys.nextElement();
tim@3:                 String value = config.getInitParameter(key);
tim@36:                 log.info("New ConbfigurationValue; " + key + " ==> " + value);
tim@3:                 this.properties.put(key, value);
tim@3:             }
tim@3:         }
tim@3:     }
tim@3: 
ingo@690: 
tim@3:     public String getPropertieValue(String key, String defaultValue) {
tim@3:         String value = this.properties.get(key);
tim@36:         if (value == null) {
tim@3:             value = defaultValue;
tim@3:         }
tim@3:         return value;
tim@3:     }
tim@3: }
sascha@700: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :