package goodjava.io;

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.nio.file.Files;


public final class IoUtils {
	private IoUtils() {}  // never

	public static void move( File from, File to ) throws IOException {
		Files.move( from.toPath(), to.toPath() );
	}

	public static void delete(File file) throws IOException {
		Files.deleteIfExists( file.toPath() );
	}

	public static boolean isSymbolicLink(File file) {
		return Files.isSymbolicLink(file.toPath());
	}

	public static void deleteRecursively(File file) throws IOException {
		if( file.isDirectory() && !isSymbolicLink(file) ) {
			for( File f : file.listFiles() ) {
				deleteRecursively(f);
			}
		}
		delete(file);
	}

	public static void link(File from,File to) throws IOException {
		Files.createLink( to.toPath(), from.toPath() );
	}

	public static long copyAll(InputStream in,OutputStream out)
		throws IOException
	{
		long total = 0;
		byte[] a = new byte[8192];
		int n;
		while( (n=in.read(a)) != -1 ) {
			out.write(a,0,n);
			total += n;
		}
		return total;
	}

}