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);
   }

}