Method castable

basex-core/src/main/java/org/basex/query/expr/Convert.java:61–72

Checks if the expression can be cast to the specified type. @param castType type to cast to @return result of check or null

(final SeqType castType)

   * @return result of check or {@code null}
   */
  final Boolean castable(final SeqType castType) {
    final SeqType est = expr.seqType();
    if(!est.mayBeWrapped()) {
      final long es = expr.size();
      if(es != -1 && (es < castType.occ.min || es > castType.occ.max)) return false;

      final Type et = est.type;
      if(et.instanceOf(castType.type) && est.occ.instanceOf(castType.occ) &&
          (et.eq(castType.type) || castType.type == BasicType.NUMERIC)) return true;
    }
    return null;
  }

  /**
   * Checks if the argument can be simplified.