private List formatSchema4Display()

in samza-sql-shell/src/main/java/org/apache/samza/sql/client/impl/CliCommandHandler.java [556:662]
92 lines of code
13 McCabe index (conditional complexity)

  private List<String> formatSchema4Display(SqlSchema schema) {
    final String headerField = "Field";
    final String headerType = "Type";
    final char seperator = '|';
    final char lineSep = '-';

    int terminalWidth = terminal.getWidth();
    // Two spaces * 2 plus one SEPERATOR
    if (terminalWidth < 2 + 2 + 1 + headerField.length() + headerType.length()) {
      return Collections.singletonList("Not enough room.");
    }

    // Find the best seperator position for least rows
    int seperatorPos = headerField.length() + 2;
    int minRowNeeded = Integer.MAX_VALUE;
    int longestLineCharNum = 0;
    int rowCount = schema.getFields().size();
    for (int j = seperatorPos; j < terminalWidth - headerType.length() - 2; ++j) {
      boolean fieldWrapped = false;
      int rowNeeded = 0;
      for (int i = 0; i < rowCount; ++i) {
        SqlSchema.SqlField field = schema.getFields().get(i);
        int fieldLen = field.getFieldName().length();
        int typeLen = field.getFieldSchema().getFieldType().toString().length();
        int fieldRowNeeded = CliUtil.ceilingDiv(fieldLen, j - 2);
        int typeRowNeeded = CliUtil.ceilingDiv(typeLen, terminalWidth - 1 - j - 2);

        rowNeeded += Math.max(fieldRowNeeded, typeRowNeeded);
        fieldWrapped |= fieldRowNeeded > 1;
        if (typeRowNeeded > 1) {
          longestLineCharNum = terminalWidth;
        } else {
          longestLineCharNum = Math.max(longestLineCharNum, j + typeLen + 2 + 1);
        }
      }
      if (rowNeeded < minRowNeeded) {
        minRowNeeded = rowNeeded;
        seperatorPos = j;
      }
      if (!fieldWrapped)
        break;
    }

    List<String> lines = new ArrayList<>(minRowNeeded + 4);

    // Header
    StringBuilder line = new StringBuilder(terminalWidth);
    line.append(CliConstants.SPACE);
    line.append(headerField);
    CliUtil.appendTo(line, seperatorPos - 1, CliConstants.SPACE);
    line.append(seperator);
    line.append(CliConstants.SPACE);
    line.append(headerType);
    lines.add(line.toString());
    line = new StringBuilder(terminalWidth);
    CliUtil.appendTo(line, longestLineCharNum - 1, lineSep);
    lines.add(line.toString());

    // Body
    AttributedStyle oddLineStyle = AttributedStyle.BOLD.foreground(AttributedStyle.BLUE);
    AttributedStyle evenLineStyle = AttributedStyle.BOLD.foreground(AttributedStyle.CYAN);

    final int fieldColSize = seperatorPos - 2;
    final int typeColSize = terminalWidth - seperatorPos - 1 - 2;
    for (int i = 0; i < rowCount; ++i) {
      SqlSchema.SqlField sqlField = schema.getFields().get(i);
      String field = sqlField.getFieldName();
      String type = getFieldDisplayValue(sqlField.getFieldSchema());
      int fieldLen = field.length();
      int typeLen = type.length();
      int fieldStartIdx = 0, typeStartIdx = 0;
      while (fieldStartIdx < fieldLen || typeStartIdx < typeLen) {
        line = new StringBuilder(terminalWidth);
        line.append(CliConstants.SPACE);
        int numToWrite = Math.min(fieldColSize, fieldLen - fieldStartIdx);
        if (numToWrite > 0) {
          line.append(field, fieldStartIdx, fieldStartIdx + numToWrite);
          fieldStartIdx += numToWrite;
        }
        CliUtil.appendTo(line, seperatorPos - 1, CliConstants.SPACE);
        line.append(seperator);
        line.append(CliConstants.SPACE);

        numToWrite = Math.min(typeColSize, typeLen - typeStartIdx);
        if (numToWrite > 0) {
          line.append(type, typeStartIdx, typeStartIdx + numToWrite);
          typeStartIdx += numToWrite;
        }

        if (i % 2 == 0) {
          AttributedStringBuilder attrBuilder = new AttributedStringBuilder().style(evenLineStyle);
          attrBuilder.append(line.toString());
          lines.add(attrBuilder.toAnsi());
        } else {
          AttributedStringBuilder attrBuilder = new AttributedStringBuilder().style(oddLineStyle);
          attrBuilder.append(line.toString());
          lines.add(attrBuilder.toAnsi());
        }
      }
    }

    // Footer
    line = new StringBuilder(terminalWidth);
    CliUtil.appendTo(line, longestLineCharNum - 1, lineSep);
    lines.add(line.toString());
    return lines;
  }