Пример #1
0
 /**
  * Returns a string representation of a path summary node.
  *
  * @param data data reference
  * @param level level
  * @return string representation
  */
 byte[] info(final Data data, final int level) {
   final TokenBuilder tb = new TokenBuilder();
   if (level != 0) tb.add(Text.NL);
   for (int i = 0; i < level << 1; ++i) tb.add(' ');
   switch (kind) {
     case Data.DOC:
       tb.add(DOC);
       break;
     case Data.ELEM:
       tb.add(data.elemNames.key(name));
       break;
     case Data.TEXT:
       tb.add(TEXT);
       break;
     case Data.ATTR:
       tb.add(ATT);
       tb.add(data.attrNames.key(name));
       break;
     case Data.COMM:
       tb.add(COMMENT);
       break;
     case Data.PI:
       tb.add(PI);
       break;
   }
   tb.add(": " + stats);
   for (final PathNode p : children) tb.add(p.info(data, level + 1));
   return tb.finish();
 }
Пример #2
0
  /**
   * Returns all summary path nodes for the specified location step or {@code null} if nodes cannot
   * be retrieved or are found on different levels.
   *
   * @param data data reference
   * @param last last step to be checked
   * @return path nodes
   */
  private ArrayList<PathNode> pathNodes(final Data data, final int last) {
    // skip request if no path index exists or might be out-of-date
    if (!data.meta.uptodate) return null;

    ArrayList<PathNode> nodes = data.paths.root();
    for (int s = 0; s <= last; s++) {
      // only follow axis steps
      final Step curr = axisStep(s);
      if (curr == null) return null;

      final boolean desc = curr.axis == DESC;
      if (!desc && curr.axis != CHILD || curr.test.kind != Kind.NAME) return null;

      final int name = data.elemNames.id(curr.test.name.local());

      final ArrayList<PathNode> tmp = new ArrayList<>();
      for (final PathNode node : PathSummary.desc(nodes, desc)) {
        if (node.kind == Data.ELEM && name == node.name) {
          // skip test if an element name occurs on different levels
          if (!tmp.isEmpty() && tmp.get(0).level() != node.level()) return null;
          tmp.add(node);
        }
      }
      if (tmp.isEmpty()) return null;
      nodes = tmp;
    }
    return nodes;
  }
Пример #3
0
  /**
   * Returns all summary path nodes for the specified location step or {@code null} if nodes cannot
   * be retrieved or are found on different levels.
   *
   * @param data data reference
   * @param l last step to be checked
   * @return path nodes
   */
  ArrayList<PathNode> pathNodes(final Data data, final int l) {
    // skip request if no path index exists or might be out-of-date
    if (!data.meta.uptodate) return null;

    ArrayList<PathNode> in = data.paths.root();
    for (int s = 0; s <= l; ++s) {
      final Step curr = axisStep(s);
      if (curr == null) return null;
      final boolean desc = curr.axis == DESC;
      if (!desc && curr.axis != CHILD || curr.test.mode != Mode.LN) return null;

      final int name = data.tagindex.id(curr.test.name.local());

      final ArrayList<PathNode> al = new ArrayList<>();
      for (final PathNode pn : PathSummary.desc(in, desc)) {
        if (pn.kind == Data.ELEM && name == pn.name) {
          // skip test if a tag is found on different levels
          if (!al.isEmpty() && al.get(0).level() != pn.level()) return null;
          al.add(pn);
        }
      }
      if (al.isEmpty()) return null;
      in = al;
    }
    return in;
  }
Пример #4
0
  /**
   * Writes the node to the specified output stream.
   *
   * @param out output stream
   * @throws IOException I/O exception
   */
  void write(final DataOutput out) throws IOException {
    out.writeNum(name);
    out.write1(kind);
    out.writeNum(0);
    out.writeNum(children.length);
    out.writeDouble(1);

    // update leaf flag
    boolean leaf = stats.isLeaf();
    for (final PathNode child : children) {
      leaf &= child.kind == Data.TEXT || child.kind == Data.ATTR;
    }
    stats.setLeaf(leaf);
    stats.write(out);
    for (final PathNode child : children) child.write(out);
  }
Пример #5
0
 /**
  * Recursively adds the node and its descendants to the specified list with the specified name.
  *
  * @param nodes node list
  * @param nm name id
  */
 public void addDesc(final ArrayList<PathNode> nodes, final int nm) {
   if (kind == Data.ELEM && nm == name) nodes.add(this);
   for (final PathNode child : children) child.addDesc(nodes, nm);
 }
Пример #6
0
 /**
  * Recursively adds the node and its descendants to the specified list.
  *
  * @param nodes node list
  */
 void addDesc(final ArrayList<PathNode> nodes) {
   nodes.add(this);
   for (final PathNode child : children) child.addDesc(nodes);
 }
Пример #7
0
  /**
   * Converts descendant to child steps.
   *
   * @param ctx query context
   * @param data data reference
   * @return path
   */
  Expr children(final QueryContext ctx, final Data data) {
    // skip path check if no path index exists, or if it is out-of-date
    if (!data.meta.uptodate || data.nspaces.globalNS() == null) return this;

    Path path = this;
    for (int s = 0; s < steps.length; ++s) {
      // don't allow predicates in preceding location steps
      final Step prev = s > 0 ? axisStep(s - 1) : null;
      if (prev != null && prev.preds.length != 0) break;

      // ignore axes other than descendant, or numeric predicates
      final Step curr = axisStep(s);
      if (curr == null || curr.axis != DESC || curr.has(Flag.FCS)) continue;

      // check if child steps can be retrieved for current step
      ArrayList<PathNode> pn = pathNodes(data, s);
      if (pn == null) continue;

      // cache child steps
      final ArrayList<QNm> qnm = new ArrayList<>();
      while (pn.get(0).par != null) {
        QNm nm = new QNm(data.tagindex.key(pn.get(0).name));
        // skip children with prefixes
        if (nm.hasPrefix()) return this;
        for (final PathNode p : pn) {
          if (pn.get(0).name != p.name) nm = null;
        }
        qnm.add(nm);
        pn = PathSummary.parent(pn);
      }
      ctx.compInfo(OPTCHILD, steps[s]);

      // build new steps
      int ts = qnm.size();
      final Expr[] stps = new Expr[ts + steps.length - s - 1];
      for (int t = 0; t < ts; ++t) {
        final Expr[] preds = t == ts - 1 ? ((Preds) steps[s]).preds : new Expr[0];
        final QNm nm = qnm.get(ts - t - 1);
        final NameTest nt =
            nm == null ? new NameTest(false) : new NameTest(nm, Mode.LN, false, null);
        stps[t] = Step.get(info, CHILD, nt, preds);
      }
      while (++s < steps.length) stps[ts++] = steps[s];
      path = get(info, root, stps);
      break;
    }

    // check if the all children in the path exist; don't test with namespaces
    if (data.nspaces.size() == 0) {
      LOOP:
      for (int s = 0; s < path.steps.length; ++s) {
        // only verify child steps; ignore namespaces
        final Step st = path.axisStep(s);
        if (st == null || st.axis != CHILD) break;
        if (st.test.mode == Mode.ALL || st.test.mode == null) continue;
        if (st.test.mode != Mode.LN) break;

        // check if one of the addressed nodes is on the correct level
        final int name = data.tagindex.id(st.test.name.local());
        for (final PathNode pn : data.paths.desc(name, Data.ELEM)) {
          if (pn.level() == s + 1) continue LOOP;
        }
        ctx.compInfo(OPTPATH, path);
        return Empty.SEQ;
      }
    }
    return path;
  }