package org.webslinger.ext.image;

 import java.io.File;

 import java.io.IOException;

 import java.util.List;

 import org.apache.commons.vfs.FileObject;

 import org.webslinger.lang.ConcurrentCache;

 import org.webslinger.util.TTLObject;

 public final class ImageConvertingCache extends ConcurrentCache<ImageDescriptor, TTLObject<FileObject>> {

     private final ImageConvertor convertor;

     public ImageConvertingCache(Class<?> owner, String field, String label, ImageConvertor convertor) {

         super(owner, field, label, ConcurrentCache.SOFT);

         this.convertor = convertor;

     }

     public List<ImageTransformerFactory> getFactories() {

         return convertor.getFactories();

     }

     public TTLObject<FileObject> get(ImageDescriptor key) throws IOException {

         try {

             return super.get(key);

         } catch (IOException e) {

             throw e;

         } catch (RuntimeException e) {

             throw e;

         } catch (Exception e) {

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

         }

     }

     protected TTLObject<FileObject> createValue(ImageDescriptor key) {

         return convertor.load(key);

     }

 }