Selenium - Unable to pick particular rows from TestData excel file - selenium

Question

I am trying to build the TestDataReader.java file. My code should pick only the rows which are tagged by the particular testcaseid (For eg: for Test Case 1, it should pick only rows with TC_001, for Test Case 2 it should pick only rows with TC_002) and return the data to the Dataprovider method. With the below attached code, When i pass Test Case ID as TC_002, it is putting null in the testData[rowNum][0] column for rows with TC_001.
My expectation is that i should get rows only for TC_002. it should not process for TC_001.
Please suggest what is incorrect in this code.
Below is my TestDatareader class:
package com.automation.website.kaspick.utils;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.HashMap;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class TestDataReader {
XSSFWorkbook xlWorkbook = null;
XSSFSheet sheet = null;
XSSFRow row = null;
XSSFCell cell = null;
String currentDir = Paths.get("").toAbsolutePath().toString();
String testDataFileName = "\\TestData\\TestData.xlsx";
String sheetName = null;
String xlFilePath = currentDir + testDataFileName;
public Object[][] readTestData(String sheetName, String testCaseID) throws IOException {
String rowHeader = null;
String columnValue = null;
FileInputStream fileInputStream = new FileInputStream(xlFilePath);
xlWorkbook = new XSSFWorkbook(fileInputStream);
sheet = xlWorkbook.getSheet(sheetName);
int rowCount = sheet.getLastRowNum();
Object[][] testData = new Object[rowCount][1]; // This object is created to store the MapData as an object for
// DataProvider
if (sheet.getSheetName().equalsIgnoreCase(sheetName)) {
for (int rowNum = 0; rowNum < rowCount; rowNum++) {
HashMap<Object, Object> testDataInEachRow = new HashMap<Object, Object>();
row = sheet.getRow(rowNum + 1); // Since the first row will be header, parse from the second row
int columnCount = row.getLastCellNum();
for (int colNum = 0; colNum < columnCount; colNum++) {
rowHeader = sheet.getRow(0).getCell(colNum).toString();
if(colNum==0 && !row.getCell(colNum).toString().equalsIgnoreCase(testCaseID)) {
break;
}
if (row.getCell(colNum) != null) {
columnValue = row.getCell(colNum).toString();
} else {
columnValue = "";
}
testDataInEachRow.put(rowHeader, columnValue);
}
}
testData[rowNum][0] = testDataInEachRow;
}
return testData;
}
}
Below is my Test Data. I have masked the data
[TestData.xlsx][1]
[1]: https://i.stack.imgur.com/h6cMf.png