/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.knowcenter.wag.egov.egiz.cfg;

import java.util.Properties;

import at.gv.egiz.pdfas.api.sign.SignParameters;
import at.gv.egiz.pdfas.utils.OgnlUtil;

/**
 * Thread local holder for profile override values. 
 * Don't use this class directly, use {@link SignParameters#setProfileOverrideValue(String, String)} 
 * 
 * @author exthex
 *
 */
public class OverridePropertyHolder {
   
   private static ThreadLocal propHolder = new ThreadLocal() {    
      protected Object initialValue() { return new Properties();};
   };
   private static ThreadLocal ognlHolder = new ThreadLocal();
   
   public static Properties getOverrideProps() {
      return (Properties) propHolder.get();
   }   
   
   public static void setOverrideProps(Properties props) {
      propHolder.set(props);
   }
   
   public static void setProperty(String key, String val) {
      getOverrideProps().setProperty(key, val);
   }
   
   public static String getProperty(String key) {
      
      String res = getOverrideProps().getProperty(key);
      if (res != null) {
         OgnlUtil ognl = getOgnl();
         if (ognl != null && ognl.containsExpression(res)) {
            // evaluate expression
            res = ognl.compileMessage(res);                        
         }
      }
      return res;
   }
   
   public static void removeProperties() {      
      propHolder.set(new Properties());
   }
   
   public static void setOgnlUtil(OgnlUtil ognl) {
      ognlHolder.set(ognl);      
   }
   
   private static OgnlUtil getOgnl() {
      return (OgnlUtil) ognlHolder.get();      
   }
   
   public static void removeOgnlUtil() {
      ognlHolder.set(null);
   }

}