package org.webslinger;

 import org.apache.commons.vfs.FileObject;

 import org.webslinger.commons.vfs.CachingLister;

 import org.webslinger.commons.vfs.ReloadingCachingLister;

 import org.webslinger.lang.ConcurrentCache;

 public final class StandardThemingCachingLister implements ThemingFactory<CachingLister> {

     private final String themeSubDir;

     private final FileObject root;

     private final ConcurrentCache<String, CachingLister> listers = new ConcurrentCache<String, CachingLister>(StandardThemingCachingLister.class, "listers", null, ConcurrentCache.SOFT) {

         protected CachingLister createValue(String key) throws Exception {

             return new ReloadingCachingLister(root.resolveFile(key + "/" + themeSubDir));

         }

     };

     public StandardThemingCachingLister(FileObject root, String themeSubDir) {

         this.root = root;

         this.themeSubDir = themeSubDir;

     }

     public CachingLister getThemedObject(String themePath) {

         try {

             return listers.get(themePath);

         } catch (RuntimeException e) {

             throw e;

         } catch (Exception e) {

             throw (InternalError) new InternalError(e.getMessage()).initCause(e);

         }

     }

 }