PathUtils.java

/**
 * 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 com.alibaba.jstorm.utils;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.common.base.Joiner;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author yannian
 */
public class PathUtils {
    static Logger LOG = LoggerFactory.getLogger(PathUtils.class);

    public static final String SEPARATOR = "/";

    /**
     * split path as list
     */
    public static List<String> tokenize_path(String path) {
        String[] tokens = path.split(SEPARATOR);
        java.util.ArrayList<String> rtn = new ArrayList<>();
        for (String str : tokens) {
            if (!str.isEmpty()) {
                rtn.add(str);
            }
        }
        return rtn;
    }

    public static String toks_to_path(List<String> tokens) {
        StringBuilder buff = new StringBuilder();
        buff.append(SEPARATOR);
        int size = tokens.size();
        for (int i = 0; i < size; i++) {
            buff.append(tokens.get(i));
            if (i < (size - 1)) {
                buff.append(SEPARATOR);
            }

        }
        return buff.toString();
    }

    public static String normalize_path(String path) {
        return toks_to_path(tokenize_path(path));
    }

    public static String parent_path(String path) {
        List<String> tokens = tokenize_path(path);
        int size = tokens.size();
        if (size > 0) {
            tokens.remove(size - 1);
        }
        return toks_to_path(tokens);
    }

    public static String full_path(String parent, String name) {
        return normalize_path(parent + SEPARATOR + name);
    }

    public static boolean exists_file(String path) {
        return (new File(path)).exists();
    }

    public static void rmr(String path) throws IOException {
        LOG.debug("Rmr path " + path);
        if (exists_file(path)) {
            FileUtils.forceDelete(new File(path));
        }
    }

    public static void local_mkdirs(String path) throws IOException {
        LOG.debug("Making dirs at" + path);
        FileUtils.forceMkdir(new File(path));
    }

    public static void rmpath(String path) {
        LOG.debug("Removing path " + path);
        boolean succ = (new File(path)).delete();
        if (!succ) {
            throw new RuntimeException("Failed to delete " + path);
        }
    }

    public static void touch(String path) throws IOException {
        LOG.debug("Touching file at " + path);
        boolean success = (new File(path)).createNewFile();
        if (!success) {
            throw new RuntimeException("Failed to touch " + path);
        }
    }

    public static List<String> read_dir_contents(String dir) {
        ArrayList<String> rtn = new ArrayList<>();
        if (exists_file(dir)) {
            File[] list = (new File(dir)).listFiles();
            if (list == null) {
                return rtn;
            }
            for (File f : list) {
                rtn.add(f.getName());
            }
        }
        return rtn;
    }

    public static String getCanonicalPath(String fileName) {
        String ret = null;
        File file = new File(fileName);
        if (file.exists()) {
            try {
                ret = file.getCanonicalPath();
            } catch (IOException e) {
                LOG.error("", e);
            }
        } else {
            LOG.warn(fileName + " doesn't exist ");
        }

        return ret;
    }

    public static String join(String... pathList) {
        return Joiner.on(File.separator).join(pathList);
    }

    public static void mv(String src, String dest) {
        try {
            FileUtils.moveFile(new File(src), new File(dest));
        } catch (IOException ignored) {
        }
    }

}