package com.kmecpp.jspark.util;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.nio.file.Path;
import java.util.ArrayList;
public class FileUtil {
private static final int BUFFER_SIZE = 8192;
/**
* Recursively gets all the files in the given directory and in all of its
* sub directories. If the given directory is a file, this method will
* return an ArrayList containing solely the path to that file
*
* @param file
* the file or directory to search
* @return an ArrayList of all the files in the given directory
*/
public static ArrayList<File> getFiles(File file) {
return getFiles(file, new ArrayList<>());
}
private static ArrayList<File> getFiles(File file, ArrayList<File> files) {
if (file.isFile()) {
files.add(file);
} else {
for (File f : file.listFiles()) {
getFiles(f, files);
}
}
return files;
}
public static String readFile(Path path) {
try {
return readStream(path.toUri().toURL().openStream());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* High performance read from an {@link InputStream} into a String
*
* @param inputStream
* the input stream from which to read
* @return the string read from the reader
* @throws IOException
* if an IOException occurs
*/
private static String readStream(InputStream inputStream) throws IOException {
InputStreamReader reader = new InputStreamReader(inputStream);
StringWriter sw = new StringWriter();
char[] buffer = new char[BUFFER_SIZE];
int pos = 0;
while ((pos = reader.read(buffer)) != -1) {
sw.write(buffer, 0, pos);
}
return sw.toString();
}
}
