de.flapdoodle.embed.process.io.Files Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011
 *   Michael Mosmann 
 *   Martin Jöhren 
 *
 * with contributions from
 * 	konstantin-ba@github,
	Archimedes Trajano (trajano@github),
	Kevin D. Keck (kdkeck@github),
	Ben McCann (benmccann@github)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.flapdoodle.embed.process.io;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;
import java.util.Comparator;
import java.util.stream.Stream;

public abstract class Files {
	private Files() {
		// no instance
	}

	public static void deleteAll(Path rootPath) throws IOException {
		try (Stream walk = java.nio.file.Files.walk(rootPath)) {
			walk.sorted(Comparator.reverseOrder())
				.map(Path::toFile)
				.forEach(File::delete);
		}
	}

	private static final int BYTE_BUFFER_LENGTH = 1024 * 16;

	public static void write(InputStream inputStream, long size, Path destination) throws IOException {
		try (final OutputStream out = java.nio.file.Files.newOutputStream(destination)) {
			final byte[] buf = new byte[BYTE_BUFFER_LENGTH];
			int read;
			int left = buf.length;
			if (left > size) {
				left = (int) size;
			}
			while ((read = inputStream.read(buf, 0, left)) > 0) {

				out.write(buf, 0, read);

				size = size - read;
				if (left > size)
					left = (int) size;
			}
		}
	}

}