Method parseSheet has a Cognitive Complexity of 82 (exceeds 5 allowed). Consider refactoring.

Open

    public ExcelSheet parseSheet(CharSequence stringFile, CharSequence sheetFile) {
        ExcelSheet data = new ExcelSheet();
        SimpleKeyValueList<String, ExcelCell> cells = new SimpleKeyValueList<String, ExcelCell>();
        SimpleKeyValueList<String, String> mergeCellPos = new SimpleKeyValueList<String, String>();

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Method parseSheet has 84 lines of code (exceeds 25 allowed). Consider refactoring.

Open

    public ExcelSheet parseSheet(CharSequence stringFile, CharSequence sheetFile) {
        ExcelSheet data = new ExcelSheet();
        SimpleKeyValueList<String, ExcelCell> cells = new SimpleKeyValueList<String, ExcelCell>();
        SimpleKeyValueList<String, String> mergeCellPos = new SimpleKeyValueList<String, String>();

File ExcelParser.java has 281 lines of code (exceeds 250 allowed). Consider refactoring.

Open

package de.uniks.networkparser.parser;

import de.uniks.networkparser.DateTimeEntity;
import de.uniks.networkparser.EntityCreator;
import de.uniks.networkparser.EntityUtil;

Method readCSV has a Cognitive Complexity of 19 (exceeds 5 allowed). Consider refactoring.

Open

    public SimpleList<Object> readCSV(Buffer data, SendableEntityCreator creator) {
        SimpleList<Object> result = new SimpleList<Object>();
        if (data == null || creator == null) {
            return result;
        }

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Method readCSV has 38 lines of code (exceeds 25 allowed). Consider refactoring.

Open

    public SimpleList<Object> readCSV(Buffer data, SendableEntityCreator creator) {
        SimpleList<Object> result = new SimpleList<Object>();
        if (data == null || creator == null) {
            return result;
        }

Avoid deeply nested control flow statements.

Open

                        if (CELL_TYPE_REFERENCE.equalsIgnoreCase(excelCell.getType())) {
                            /* <v>2</v> */
                            EntityList element = cell.getChild(0);
                            if (element != null) {
                                String ref = ((XMLEntity) element).getValue();

Avoid deeply nested control flow statements.

Open

                        if (item == null || item.x < 0 || item.y < 0) {
                            continue;
                        }

Avoid deeply nested control flow statements.

Open

                        if (CELL.equalsIgnoreCase(cell.getTag()) == false) {
                            continue;
                        }

Avoid deeply nested control flow statements.

Open

                        if (item == null || item instanceof ExcelCell == false) {
                            continue;
                        }

Method writeCSV has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

Open

    public CharacterBuffer writeCSV(SimpleList<SimpleList<ExcelCell>> data) {
        CharacterBuffer result = new CharacterBuffer();
        if (data == null) {
            return result;
        }

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Method getHeaderWorkbook has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

Open

    private String getHeaderWorkbook(ExcelWorkBook content, int id) {
        CharacterBuffer data = new CharacterBuffer().with(HEADER);
        data.with(
                "<workbook xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" xmlns:mc=\"http://schemas.openxmlformats.org/markup-compatibility/2006\">\r\n    <sheets>\r\n");
        for (int i = 0; i < content.size(); i++) {

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