package org.vamsas.client.simpleclient;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Timer;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;

import org.vamsas.objects.core.LockFileDescriptor;

/**
 * low level vamsas document management routines
 * analogous to ClientsFile
 * This class is not thread safe.
 * @author jimp
 *
 */
public class VamsasFile extends SessionFile {
  /**
   * 
   * Connect to an existing Vamsas document in a given sessionDir
   * or create a new one.
   * 
   * @param sessionDir
   * @throws java.io.IOException
   */
  public VamsasFile(File sessionFile) throws java.io.IOException {
    super(sessionFile);
  }
  /**
   * Expand a previously stored session into the sessionDir
   * @param sessionDir
   * @param storedSession
   
   public VamsasFile(File sessionDir, JarFile storedSession) throws IOException {
    // check if sessionDir is live or not
    if (!sessionDir.exists()) {
      sessionDir.mkdir();
    }
    
    {
      // check its actually a writable directory
    }
    
    File sfile = new File(sessionDir, "vamsas.jar");
    VamsasFile(sfile);
    // if live - try to merge storedSession with sessionDir
    //  - will probably fail through duplicate object references needing to be dereferenced.
    // TODO: think of a way of specifying vorba_id scope for an application's references to allow merging of one vamsasDocument with another.
    
  }
  */
  
  /**
   * gets a locked Reader for the vamsas document.
   * @return reader for vamsasdocument.xml enrty
   */
  public Lock getLock() {
    while (!lockFile())
      ;
    return fileLock;
  }
  
  public java.io.Reader getDocumentReader() {
    
    try {
      JarFile session = new JarFile("vamsasJar");
      //JarEntry vamsasDocument = session.getJarEntry("vamsasDocument.xml");
      //return new InputStreamReader(session.getInputStream(vamsasDocument));
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return null;
  }
  
  
}