Class PathIndex

basex-core/src/main/java/org/basex/index/path/PathIndex.java:25–273

This class stores the path summary of a database. It contains all unique location paths. @author BaseX Team, BSD License @author Christian Gruen

 * @author Christian Gruen
 */
public final class PathIndex implements Index {
  /** Node stack for building the summary. */
  private final ArrayList<PathNode> stack = new ArrayList<>();
  /** Data reference. */
  private Data data;
  /** Root node. */
  private PathNode root;

  /**
   * Constructor.
   * The {@link Data} reference must be set in a second step via {@link #data(Data)}.
   */
  public PathIndex() {
    init();
  }

  /**
   * Constructor, specifying a data reference.
   * @param data data reference
   */
  public PathIndex(final Data data) {
    this();
    this.data = data;
  }

  /**
   * Constructor, specifying an input file.
   * @param data data reference
   * @param in input stream
   * @throws IOException I/O exception
   */
  public PathIndex(final Data data, final DataInput in) throws IOException {
    root = in.readBool() ? new PathNode(in, null) : new PathNode();
    this.data = data;
  }

  /**
   * Writes the path summary to the specified output.
   * @param out output stream
   * @throws IOException I/O exception
   */
  public void write(final DataOutput out) throws IOException {
    out.writeBool(root != null);
    if(root != null) root.write(out, data.meta);
  }

  /**
   * Sets the data reference.
   * @param dt reference
   */
  public void data(final Data dt) {
    data = dt;
  }

  /**
   * Initializes the index.
   */
  public void init() {