Esempio n. 1
0
  /**
   * Checks if the predicates are successful for the specified item.
   *
   * @param it item to be checked
   * @param qc query context
   * @return result of check
   * @throws QueryException query exception
   */
  protected final boolean preds(final Item it, final QueryContext qc) throws QueryException {
    if (preds.length == 0) return true;

    // set context value and position
    final Value cv = qc.value;
    try {
      if (qc.scoring) {
        double s = 0;
        for (final Expr p : preds) {
          qc.value = it;
          final Item i = p.test(qc, info);
          if (i == null) return false;
          s += i.score();
        }
        it.score(Scoring.avg(s, preds.length));
      } else {
        for (final Expr p : preds) {
          qc.value = it;
          if (p.test(qc, info) == null) return false;
        }
      }
      return true;
    } finally {
      qc.value = cv;
    }
  }
Esempio n. 2
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 /**
  * Merges two matches.
  *
  * @param i1 first item
  * @param i2 second item
  */
 private static void and(final FTNode i1, final FTNode i2) {
   final FTMatches all = new FTMatches((byte) Math.max(i1.matches().pos, i2.matches().pos));
   for (final FTMatch s1 : i1.matches()) {
     for (final FTMatch s2 : i2.matches()) {
       all.add(new FTMatch(s1.size() + s2.size()).add(s1).add(s2));
     }
   }
   i1.score(Scoring.avg(i1.score() + i2.score(), 2));
   i1.matches(all);
 }
Esempio n. 3
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  @Override
  public FTNode item(final QueryContext qc, final InputInfo ii) throws QueryException {
    if (pos == 0) pos = ++qc.ftPos;
    matches.reset(pos);

    final int c = contains(qc);
    if (c == 0) matches.size(0);

    // scoring: include number of tokens for calculations
    return new FTNode(matches, c == 0 ? 0 : Scoring.word(c, qc.ftToken.count()));
  }
Esempio n. 4
0
  @Override
  public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
    // compute scoring
    if (qc.scoring) {
      double s = 0;
      boolean f = false;
      for (final Expr expr : exprs) {
        final Item it = expr.ebv(qc, info);
        f |= it.bool(ii);
        s += it.score();
      }
      return Bln.get(f, Scoring.avg(s, exprs.length));
    }

    // standard evaluation
    for (final Expr expr : exprs) {
      if (expr.ebv(qc, info).bool(ii)) return Bln.TRUE;
    }
    return Bln.FALSE;
  }