Class RESTCmd

basex-api/src/main/java/org/basex/http/rest/RESTCmd.java:22–155

Abstract class for performing REST operations. @author BaseX Team, BSD License @author Christian Gruen

 * @author Christian Gruen
 */
abstract class RESTCmd extends Command {
  /** REST session. */
  final RESTSession session;

  /** Response status (can be {@code null}). */
  HTTPStatus status;

  /**
   * Constructor.
   * @param session REST session
   */
  RESTCmd(final RESTSession session) {
    // permissions will be tested if single commands are run
    super(Perm.NONE);
    this.session = session;
    jc().type(RESTText.REST);
  }

  @Override
  public void addLocks() {
    final Locks locks = jc().locks;
    final LockList reads = locks.reads, writes = locks.writes;

    for(final Command cmd : session) {
      cmd.addLocks();
      // if command updates the context, it may affect any database that has been opened before.
      // hence, all read locks will be added to list of write locks
      final Locks cmdLocks = cmd.jc().locks;
      if(cmdLocks.writes.contains(Locking.CONTEXT)) writes.add(reads);
      // merge lock lists
      reads.add(cmdLocks.reads);
      writes.add(cmdLocks.writes);
    }
  }

  @Override
  public boolean updating(final Context ctx) {
    boolean up = false;
    for(final Command cmd : session) up |= cmd.updating(ctx);
    updating = up;
    return up;
  }

  @Override
  protected final boolean run() {
    try {
      run0();
      return true;
    } catch(final IOException ex) {
      return error(ex.getMessage());
    } finally {
      Close.close(context);
    }
  }

  /**
   * Runs the command.
   * @throws IOException I/O exception