package org.webslinger.commons.vfs;

 import java.io.IOException;

 import org.apache.commons.vfs.FileObject;

 import org.apache.commons.vfs.Selectors;

 import org.apache.commons.vfs.provider.UriParser;

 public class FileReplicator {

     private static final char[] reserved = {'!', '#', '$', '&', '*', '(', ')', '/', '\\', '[', ']', '|', '<', '>', '?'};

     protected final FileObject cacheLocation;

     public FileReplicator(FileObject cacheLocation) {

         this.cacheLocation = cacheLocation;

     }

     public FileObject getCacheLocation() {

         return cacheLocation;

     }

     public FileObject getLocalFile(FileObject file) throws IOException {

         String url = file.getURL().toExternalForm();

         if (url.startsWith("file:")) return file;

         if (url.startsWith("wsfile:")) return file;

         FileObject localFile = getCacheLocation().resolveFile(UriParser.encode(url, reserved));

         if (!localFile.exists()) {

         } else if (localFile.getContent().getSize() != file.getContent().getSize()) {

         } else if (localFile.getContent().getLastModifiedTime() != file.getContent().getLastModifiedTime()) {

         } else {

             return localFile;

         }

         localFile.copyFrom(file, Selectors.SELECT_SELF);

         localFile.getContent().setLastModifiedTime(file.getContent().getLastModifiedTime());

         return localFile;

     }

     public void deleteLocalFile(String url) throws IOException {

         if (url.startsWith("file:")) return;

         FileObject ptr = getCacheLocation().resolveFile(UriParser.encode(url, reserved));

         while (ptr != getCacheLocation() && ptr.delete()) ptr = ptr.getParent();

     }

 }