Exemplo n.º 1
0
 /**
  * Opens the specified database.
  *
  * @param name name of database
  * @param ctx database context
  * @return data reference
  * @throws IOException I/O exception
  */
 public static Data open(final String name, final Context ctx) throws IOException {
   synchronized (ctx.dbs) {
     Data data = ctx.dbs.pin(name);
     if (data == null) {
       // check if database exists
       if (!ctx.globalopts.dbexists(name)) throw new BaseXException(dbnf(name));
       data = new DiskData(name, ctx);
       ctx.dbs.add(data);
     }
     // check permissions
     if (!ctx.perm(Perm.READ, data.meta)) {
       Close.close(data, ctx);
       throw new BaseXException(PERM_REQUIRED_X, Perm.READ);
     }
     return data;
   }
 }
Exemplo n.º 2
0
  /**
   * Executes the command, prints the result to the specified output stream and returns a success
   * flag.
   *
   * @param ctx database context
   * @param os output stream
   * @return success flag. The {@link #info()} method returns information on a potential exception
   */
  private boolean exec(final Context ctx, final OutputStream os) {
    // check if data reference is available
    final Data dt = ctx.data();
    if (dt == null && data) return error(NO_DB_OPENED);

    // check permissions
    if (!ctx.perm(perm, dt != null ? dt.meta : null)) return error(PERM_REQUIRED_X, perm);

    // set updating flag
    updating = updating(ctx);

    try {
      // register process
      ctx.register(this);
      // run command and return success flag
      return run(ctx, os);
    } finally {
      // guarantee that process will be unregistered
      ctx.unregister(this);
    }
  }