package org.webslinger.commons.vfs;

 import java.io.IOException;

 import java.io.Writer;

 import java.io.OutputStreamWriter;

 import org.apache.commons.vfs.FileObject;

 import org.webslinger.io.Charsets;

 import org.webslinger.io.RollingWriter;

 import org.webslinger.util.RolloverLogic;

 public class CommonsVfsRollingWriter extends RollingWriter {

     protected final FileObject dir;

     protected final String name;

     public CommonsVfsRollingWriter(FileObject dir, String name, String pattern) {

         this(dir, name, new RolloverLogic(pattern));

     }

     public CommonsVfsRollingWriter(FileObject dir, String name, RolloverLogic logic) {

         super(logic);

         this.dir = dir;

         this.name = name;

     }

     protected Writer makeWriter(boolean rollover) throws IOException {

         FileObject currentFile;

         boolean append;

         if (rollover) {

             currentFile = dir.resolveFile(name);

             if (currentFile.getContent().getSize() > 0) {

                 String suffix = logic.getCurrentFormat();

                 currentFile.moveTo(dir.resolveFile(name + suffix));

                 append = false;

             } else {

                 append = true;

             }

         } else {

             currentFile = dir.resolveFile(name);

             append = true;

         }

         return new OutputStreamWriter(dir.resolveFile(name).getContent().getOutputStream(append), Charsets.UTF8);

     }

 }