content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * Created on Feb 28, 2005
   */
  package org.flexdock.plaf.mappings;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  
  import javax.swing.LookAndFeel;
  import javax.swing.UIManager;
  
  
  
  import org.flexdock.plaf.Configurator;
  import org.flexdock.plaf.XMLConstants;
  import org.w3c.dom.Element;
  
  /**
   * @author Christopher Butler
   */
  public class PlafMappingFactory implements XMLConstants {
  
      public static final String PLAF_KEY = "plaf";
      private static final HashMap PLAF_MAPPINGS = loadPlafMappings();
  
      public static List getAvailablePlafNames() {
          return new ArrayList(PLAF_MAPPINGS.keySet());
      }
  
      public static String getInstalledPlafReference() {
          LookAndFeel currentPlaf = UIManager.getLookAndFeel();
          if(currentPlaf==null)
              return null;
  
          String key = currentPlaf.getClass().getName();
          return getPlafReference(key);
      }
  
      public static String getPlafReference(String key) {
          if(key==null)
              return null;
  
          Object value = PLAF_MAPPINGS.get(key);
          if(value instanceof String)
              return (String)value;
  
          // if not a String, then we must have a RefResolver
          if(value instanceof RefResolver) {
              RefResolver resolver = (RefResolver)value;
              return resolver.getRef(key);
          }
          return null;
      }
  
      private static HashMap loadPlafMappings() {
          HashMap elements = Configurator.getNamedElementsByTagName(PLAF_KEY);
          HashMap mappings = new HashMap(elements.size());
  
          for(Iterator it=elements.keySet().iterator(); it.hasNext();) {
              String key = (String)it.next();
              Element elem = (Element)elements.get(key);
  
              String name = elem.getAttribute(NAME_KEY);
              String ref = elem.getAttribute(REFERENCE_KEY);
              String resolver = elem.getAttribute(HANDLER_KEY);
              Object value = createPlafMapping(ref, resolver);
              mappings.put(name, value);
          }
          return mappings;
      }
  
  
      private static Object createPlafMapping(String refName, String resolverName) {
          if(Configurator.isNull(resolverName))
              return refName;
  
          RefResolver resolver = null;
          try {
              Class clazz = Class.forName(resolverName);
              // must be a type of PlafBasedViewResolver
              resolver = (RefResolver)clazz.newInstance();
          } catch(Exception e) {
              System.err.println("Exception: " + e.getMessage());
              return refName;
          }
  
          // setup the default value on the resolver and return
          resolver.setDefaultRef(refName);
          return resolver;
      }
  }
  