java_json_xml_projekt1/src/main/java/company/DataSaver.java

package company;

import java.io.*;

public class DataSaver {

    public DataSaver(String fileName) {
        _fileName = fileName;
    }

    public void deleteFileIfExists() {
        File fileToDelete = new File(_fileName);

        if (fileToDelete.exists())
            fileToDelete.delete();
    }

    public void deleteRowIfPeselExists(String pesel) throws IOException {
        File file = new File(_fileName);
        if (!file.exists())
            return;

        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        int lineNumber = 0;
        int lineToDelete = -1;
        String line = null;
        String lines = "";
        boolean containsPesel = false;

        while (true) {
            lineNumber++;
            line = bufferedReader.readLine();
            if (line == null)
                break;

            if (line.contains(pesel)) {
                containsPesel = true;
                continue;
            }

            lines += line + "\n";
        }

        if (!containsPesel)
            return;

        fileReader.close();
        bufferedReader.close();

        FileWriter fileWriter = new FileWriter(file, false);
        BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
        bufferedWriter.write(lines);

        bufferedWriter.close();
        fileWriter.close();
    }

    public void savePersonalDataToFile(String city, String personalData) throws IOException {
        File file = new File(_fileName);
        FileWriter fileWriter = new FileWriter(file, true);
        BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);

        bufferedWriter.write(city + ", " + personalData + "\n");

        bufferedWriter.close();
        fileWriter.close();
    }

    private int getLineNumberWithText(File file, String stringToSearch) throws IOException {
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        String line = null;
        int lineNumber = 0;
        int lineToDelete = -1;

        while (true) {
            lineNumber++;
            line = bufferedReader.readLine();
            if (line == null)
                break;

            if (line.contains(stringToSearch)) {
                lineToDelete = lineNumber;
                break;
            }
        }

        fileReader.close();
        bufferedReader.close();

        return lineToDelete;
    }

    private String _fileName;
}