uk.co.probablyfine.dirty.utils.Nio Maven / Gradle / Ivy

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package uk.co.probablyfine.dirty.utils;

import java.io.File;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

import static uk.co.probablyfine.dirty.utils.Exceptions.unchecked;

public class Nio {

  public static FileChannel fileChannel(String path) {
    File file = new File(path);
    return unchecked(() -> new RandomAccessFile(file, "rw")).getChannel();
  }

  public static MappedByteBuffer mapFile(FileChannel fileChannel, int size) {

    long channelSize = unchecked(fileChannel::size);

    return unchecked(() -> {
      long size1 = channelSize == 0 ? 2 * size : channelSize * 2;
      return fileChannel.map(FileChannel.MapMode.READ_WRITE, 0, size1);
    });
  }

}