/**
 * 
 */
package org.vamsas.client;

import java.io.File;
import java.net.URI;
import java.util.Hashtable;
import java.util.Vector;

/**
 * @author jimp
 * base class for vamsas session/document types
 * uses java.net.URI internally for construction of URN
 */
public abstract class SessionUrn {
  URI urn;
  /**
   * The types of URI protocols we understand
   */
  protected static final Hashtable TYPES=new Hashtable();
  
  /**
   * construct urn for a locally stored session file
   * @param type
   * @param file
   */
  protected SessionUrn(String type, File file) {
    if (!TYPES.containsKey(type.toLowerCase()))
      throw new Error("Unknown "+this.getClass().getName()+" type '"+type+"' for file '"+file.getAbsolutePath()+"'");
    urn = URI.create(type+"://"+file.getAbsolutePath());
  }
  public String getSessionUrn() {
    return urn.toString();
  }
  /**
   * TODO: LATER: think about this again.
   * @return File(urn.getPath())
   */
  public File asFile() {
    return new File(urn.getPath());
  }
  // TODO: add abstract 'handler' methods for resolving the URN to a particular class
}