public static String getParamString()

in core/src/main/java/org/apache/calcite/avatica/ConnectStringParser.java [297:365]
60 lines of code
19 McCabe index (conditional complexity)

  public static String getParamString(Properties props) {
    if (props == null) {
      return "";
    }

    StringBuilder buf = new StringBuilder();
    for (Map.Entry<String, String> entry : toMap(props).entrySet()) {
      final String name = entry.getKey();
      final String value = entry.getValue();
      String quote = "";
      if (buf.length() > 0) {
        buf.append(';');
      }

      // write parameter name
      if (name.startsWith(" ") || name.endsWith(" ")) {
        quote = "'";
        buf.append(quote);
      }
      int len = name.length();
      for (int i = 0; i < len; ++i) {
        char c = name.charAt(i);
        if (c == '=') {
          buf.append('=');
        }
        buf.append(c);
      }

      buf.append(quote); // might be empty
      quote = "";

      buf.append('=');

      // write parameter value
      len = value.length();
      boolean hasSemi = value.indexOf(';') >= 0;
      boolean hasSQ = value.indexOf('\'') >= 0;
      boolean hasDQ = value.indexOf('"') >= 0;
      if (value.startsWith(" ") || value.endsWith(" ")) {
        quote = "'";
      } else if (hasSemi || hasSQ || hasDQ) {
        // try to choose the least painful quote
        if (value.startsWith("\"")) {
          quote = "'";
        } else if (value.startsWith("'")) {
          quote = "\"";
        } else {
          quote = hasSQ ? "\"" : "'";
        }
      }
      char q;
      if (quote.length() > 0) {
        buf.append(quote);
        q = quote.charAt(0);
      } else {
        q = '\0';
      }
      for (int i = 0; i < len; ++i) {
        char c = value.charAt(i);
        if (c == q) {
          buf.append(q);
        }
        buf.append(c);
      }
      buf.append(quote); // might be empty
    }

    return buf.toString();
  }