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Jodd Util
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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.io;

import jodd.util.StringUtil;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

public class PathUtil {

	/**
	 * Resolves subpath in safer way. For some reason, if child starts with
	 * a separator it gets resolved as a full path, ignoring the base.
	 * This method acts different.
	 */
	public static Path resolve(final Path base, String child) {
		if (StringUtil.startsWithChar(child, File.separatorChar)) {
			child = child.substring(1);
		}
		return base.resolve(child);
	}

	public static Path resolve(Path path, final String... childs) {
		for (String child : childs) {
			path = resolve(path, child);
		}
		return path;
	}

	/**
	 * Reads path content.
	 */
	public static String readString(final Path path) throws IOException {
		try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
			StringWriter writer = new StringWriter(); // flush & close not needed for StringWriter-instance
			IOUtil.copy(reader, writer);
			return writer.toString();
		}
	}

	/**
	 * Deletes a directory recursively.
	 */
	public static void deleteFileTree(final Path directory) throws IOException {
		Files.walkFileTree(directory, new SimpleFileVisitor() {
			@Override
			public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
				Files.delete(file);
				return FileVisitResult.CONTINUE;
			}

			@Override
			public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
				Files.delete(dir);
				return FileVisitResult.CONTINUE;
			}
		});
	}

}