Method toIf

basex-core/src/main/java/org/basex/query/expr/Switch.java:170–189

Rewrites the switch to an if expression. @param cc compilation context @return new or original expression @throws QueryException query exception

(final CompileContext cc)

   * @throws QueryException query exception
   */
  private Expr toIf(final CompileContext cc) throws QueryException {
    if(groups.length != 2) return this;

    final SeqType st = cond.seqType();
    final boolean string = st.type.isStringOrUntyped(), dec = st.type.instanceOf(BasicType.DECIMAL);
    if(!st.one() || !(string || dec)) return this;

    final Expr[] exprs = groups[0].exprs;
    for(int e = exprs.length - 1; e >= 1; e--) {
      final SeqType est = exprs[e].seqType();
      if(!est.oneOrMore() || !(
        string && est.type.isStringOrUntyped() ||
        dec && est.type.instanceOf(BasicType.DECIMAL)
      )) return this;
    }

    final Expr list = List.get(cc, groups[0].info, Arrays.copyOfRange(exprs, 1, exprs.length));
    final CmpG cmp = new CmpG(groups[0].info, cond, list, CmpOp.EQ);
    return new If(info, cmp.optimize(cc), groups[0].rtrn(), groups[1].rtrn()).optimize(cc);
  }

  @Override
  public Iter iter(final QueryContext qc) throws QueryException {