Exemple #1
0
 /**
  * Internal method to create a call to a literal. Code outside this package should call one of the
  * type-specific methods such as {@link #makeDateLiteral(Calendar)}, {@link
  * #makeLiteral(boolean)}, {@link #makeLiteral(String)}.
  *
  * @param o Value of literal, must be appropriate for the type
  * @param type Type of literal
  * @param typeName SQL type of literal
  * @return Literal
  */
 protected RexLiteral makeLiteral(Comparable o, RelDataType type, SqlTypeName typeName) {
   // All literals except NULL have NOT NULL types.
   type = typeFactory.createTypeWithNullability(type, o == null);
   if (typeName == SqlTypeName.CHAR) {
     // Character literals must have a charset and collation. Populate
     // from the type if necessary.
     assert o instanceof NlsString;
     NlsString nlsString = (NlsString) o;
     if ((nlsString.getCollation() == null) || (nlsString.getCharset() == null)) {
       assert type.getSqlTypeName() == SqlTypeName.CHAR;
       assert type.getCharset().name() != null;
       assert type.getCollation() != null;
       o = new NlsString(nlsString.getValue(), type.getCharset().name(), type.getCollation());
     }
   }
   return new RexLiteral(o, type, typeName);
 }
Exemple #2
0
  public RelDataType createSqlType(RelDataTypeFactory typeFactory) {
    BitString bitString;
    switch (typeName) {
      case NULL:
      case BOOLEAN:
        RelDataType ret = typeFactory.createSqlType(typeName);
        ret = typeFactory.createTypeWithNullability(ret, null == value);
        return ret;
      case BINARY:
        bitString = (BitString) value;
        int bitCount = bitString.getBitCount();
        return typeFactory.createSqlType(SqlTypeName.BINARY, bitCount / 8);
      case CHAR:
        NlsString string = (NlsString) value;
        Charset charset = string.getCharset();
        if (null == charset) {
          charset = typeFactory.getDefaultCharset();
        }
        SqlCollation collation = string.getCollation();
        if (null == collation) {
          collation = SqlCollation.COERCIBLE;
        }
        RelDataType type = typeFactory.createSqlType(SqlTypeName.CHAR, string.getValue().length());
        type = typeFactory.createTypeWithCharsetAndCollation(type, charset, collation);
        return type;

      case INTERVAL_YEAR_MONTH:
      case INTERVAL_DAY_TIME:
        SqlIntervalLiteral.IntervalValue intervalValue = (SqlIntervalLiteral.IntervalValue) value;
        return typeFactory.createSqlIntervalType(intervalValue.getIntervalQualifier());

      case SYMBOL:
        return typeFactory.createSqlType(SqlTypeName.SYMBOL);

      case INTEGER: // handled in derived class
      case TIME: // handled in derived class
      case VARCHAR: // should never happen
      case VARBINARY: // should never happen

      default:
        throw Util.needToImplement(toString() + ", operand=" + value);
    }
  }
Exemple #3
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  /**
   * Transforms this literal (which must be of type character) into a new one in which 4-digit
   * Unicode escape sequences have been replaced with the corresponding Unicode characters.
   *
   * @param unicodeEscapeChar escape character (e.g. backslash) for Unicode numeric sequences; 0
   *     implies no transformation
   * @return transformed literal
   */
  public SqlLiteral unescapeUnicode(char unicodeEscapeChar) {
    if (unicodeEscapeChar == 0) {
      return this;
    }
    assert SqlTypeUtil.inCharFamily(getTypeName());
    NlsString ns = (NlsString) value;
    String s = ns.getValue();
    StringBuilder sb = new StringBuilder();
    int n = s.length();
    for (int i = 0; i < n; ++i) {
      char c = s.charAt(i);
      if (c == unicodeEscapeChar) {
        if (n > (i + 1)) {
          if (s.charAt(i + 1) == unicodeEscapeChar) {
            sb.append(unicodeEscapeChar);
            ++i;
            continue;
          }
        }
        if ((i + 5) > n) {
          throw SqlUtil.newContextException(
              getParserPosition(), RESOURCE.unicodeEscapeMalformed(i));
        }
        final String u = s.substring(i + 1, i + 5);
        final int v;
        try {
          v = Integer.parseInt(u, 16);
        } catch (NumberFormatException ex) {
          throw SqlUtil.newContextException(
              getParserPosition(), RESOURCE.unicodeEscapeMalformed(i));
        }
        sb.append((char) (v & 0xFFFF));

        // skip hexits
        i += 4;
      } else {
        sb.append(c);
      }
    }
    ns = new NlsString(sb.toString(), ns.getCharsetName(), ns.getCollation());
    return new SqlCharStringLiteral(ns, getParserPosition());
  }