package org.webslinger.util;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.InputStream;

 import java.io.IOException;

 import java.io.RandomAccessFile;

 import org.webslinger.util.GeneratedResult;

 import org.webslinger.util.TTLCachedObject;

 public abstract class SerializedTTLCachedObject extends TTLCachedObject<File> {

     public RandomAccessFile getRandomAccess() throws IOException {

         return new RandomAccessFile(getObject(), "r");

     }

     public InputStream getStream() throws IOException {

         return new FileInputStream(getObject());

     }

     protected GeneratedResult<File> generate(File old) throws IOException {

         if (old != null) old.delete();

         File file = createTempFile();

         long lastModifiedTime = create(file);

         return new GeneratedResult<File>(lastModifiedTime, file);

     }

     protected File createTempFile() throws IOException {

         String base = getClass().getName();

         int period = base.lastIndexOf(".");

         if (period != -1) base = base.substring(period + 1);

         File file = File.createTempFile(base, ".tmp");

         file.deleteOnExit();

         return file;

     }

     protected abstract long create(File file) throws IOException;

 }