work.eddiejamsession.file.utils.FileUtils Maven / Gradle / Ivy

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Project helps to work with Java IO

There is a newer version: 0.14.3

package work.eddiejamsession.file.utils;


import java.io.File;
import java.io.IOException;
import java.util.Base64;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.logging.Logger;

public class FileUtils {
    //public api

    public static void createIfNotExists(String filename) throws IOException {
        File file = new File(filename);
        if (!file.exists()) {
            file.createNewFile();
        }
    }

    public static byte[] computeIfAbsentBytes(String fileName, Supplier data) {
        return Base64.getDecoder().decode(computeIfAbsent(fileName, () -> Base64.getEncoder().encodeToString(data.get())));
    }

    public static Optional getData(String fileName) {
        try {
            File file = new File(fileName);
            createIfNotExists(fileName);
            String strip = null;
            strip = org.apache.commons.io.FileUtils.readFileToString(file).trim().strip();
            if (strip.isBlank() || strip.isEmpty()) {
                return Optional.empty();
            } else {
                return Optional.of(strip);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String computeIfAbsent(String fileName, Supplier stringData) {
        try {
            File file = new File(fileName);
            createIfNotExists(fileName);
            String strip;
            strip = org.apache.commons.io.FileUtils.readFileToString(file).trim().strip();
            if (strip.isBlank() || strip.isEmpty()) {
                String d = stringData.get();
                writeToFile(fileName, d);
                return d;
            } else {
                return strip;
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void writeToFile(String fileName, String data) {
        try {
            createIfNotExists(fileName);
            org.apache.commons.io.FileUtils.writeStringToFile(new File(fileName), data);
        } catch (IOException e) {
            logException(e);
        }
    }
///--
    private static void logException(IOException e) {
        Logger.getGlobal().log(Level.SEVERE, e, () -> "");
    }
}