/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.skywalking.apm.agent.core.util;

import java.io.File;
import java.nio.file.Files;

public class FileUtils {

    /**
     * delete directories and files recursively
     *
     * @param dir directory to delete
     */
    public static void deleteDirectory(File dir) {
        File[] files = dir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (!Files.isSymbolicLink(file.toPath())) {
                    if (file.isDirectory()) {
                        deleteDirectory(file);
                    } else {
                        file.delete();
                    }
                } else {
                    file.delete();
                }
            }
        }
        dir.delete();
    }

    public static void deleteDirectoryOnExit(File dir) {
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                FileUtils.deleteDirectory(dir);
            }
        });
    }
}
