| /* |
| * 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.pirk.utils; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStreamWriter; |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.json.simple.JSONObject; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Class for basic HDFS fileIO utils |
| */ |
| public class HDFS |
| { |
| private static final Logger logger = LoggerFactory.getLogger(HDFS.class); |
| |
| public static void writeFile(Collection<String> elements, FileSystem fs, String path, boolean deleteOnExit) |
| { |
| Path filePath = new Path(path); |
| |
| try |
| { |
| // create writer |
| BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fs.create(filePath, true))); |
| |
| // write each element on a new line |
| for (String element : elements) |
| { |
| bw.write(element); |
| bw.newLine(); |
| } |
| |
| bw.close(); |
| |
| // delete file once the filesystem is closed |
| if (deleteOnExit) |
| { |
| fs.deleteOnExit(filePath); |
| } |
| |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| |
| public static void writeFile(List<JSONObject> elements, FileSystem fs, String path, boolean deleteOnExit) |
| { |
| Path filePath = new Path(path); |
| |
| try |
| { |
| // create writer |
| BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fs.create(filePath, true))); |
| |
| // write each element on a new line |
| for (JSONObject element : elements) |
| { |
| bw.write(element.toString()); |
| bw.newLine(); |
| } |
| bw.close(); |
| |
| // delete file once the filesystem is closed |
| if (deleteOnExit) |
| { |
| fs.deleteOnExit(filePath); |
| } |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| |
| public static void writeFile(List<BigInteger> elements, FileSystem fs, Path path, boolean deleteOnExit) |
| { |
| try |
| { |
| // create writer |
| BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fs.create(path, true))); |
| |
| // write each element on a new line |
| for (BigInteger element : elements) |
| { |
| bw.write(element.toString()); |
| bw.newLine(); |
| } |
| bw.close(); |
| |
| // delete file once the filesystem is closed |
| if (deleteOnExit) |
| { |
| fs.deleteOnExit(path); |
| } |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| |
| public static void writeFile(Map<String,Integer> sortedMap, FileSystem fs, String path, boolean deleteOnExit) |
| { |
| Path filePath = new Path(path); |
| |
| try |
| { |
| // create writer |
| BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fs.create(filePath, true))); |
| |
| // write each element on a new line |
| for (Entry<String,Integer> entry : sortedMap.entrySet()) |
| { |
| bw.write(entry.getKey() + "," + entry.getValue()); |
| bw.newLine(); |
| } |
| bw.close(); |
| |
| // delete file once the filesystem is closed |
| if (deleteOnExit) |
| { |
| fs.deleteOnExit(filePath); |
| } |
| |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| |
| public static ArrayList<String> readFile(FileSystem fs, String filepath) |
| { |
| Path path = new Path(filepath); |
| return readFile(fs, path); |
| } |
| |
| public static ArrayList<String> readFile(FileSystem fs, Path path) |
| { |
| ArrayList<String> rv = new ArrayList<>(); |
| try (BufferedReader br = new BufferedReader(new InputStreamReader(fs.open(path)))) |
| { |
| String line; |
| while ((line = br.readLine()) != null) |
| { |
| rv.add(line); |
| } |
| } catch (Exception e) |
| { |
| e.printStackTrace(); |
| return null; |
| } |
| return rv; |
| } |
| |
| public static HashSet<String> readFileHashSet(FileSystem fs, Path path) |
| { |
| HashSet<String> rv = new HashSet<>(); |
| try (BufferedReader br = new BufferedReader(new InputStreamReader(fs.open(path)))) |
| { |
| String line; |
| while ((line = br.readLine()) != null) |
| { |
| rv.add(line); |
| } |
| |
| } catch (Exception e) |
| { |
| e.printStackTrace(); |
| return null; |
| } |
| |
| return rv; |
| } |
| |
| public static ArrayList<Path> getFilesInDirectory(FileSystem fs, String directory) |
| { |
| |
| ArrayList<Path> files = new ArrayList<>(); |
| |
| try |
| { |
| |
| Path path = new Path(directory); |
| FileStatus[] statuses = fs.listStatus(path); |
| |
| if (statuses != null) |
| { |
| for (FileStatus status : statuses) |
| { |
| files.add(status.getPath()); |
| } |
| } |
| |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| return null; |
| } |
| |
| return files; |
| |
| } |
| |
| public static Path findFileInDirectory(FileSystem fs, String directory, String startsWith) |
| { |
| |
| ArrayList<Path> files = getFilesInDirectory(fs, directory); |
| |
| if (files == null) |
| { |
| return null; |
| } |
| |
| for (Path file : files) |
| { |
| if (file.getName().startsWith(startsWith)) |
| { |
| return file; |
| } |
| } |
| |
| return null; |
| } |
| |
| public static void deletePath(FileSystem fs, String filepath) |
| { |
| Path path = new Path(filepath); |
| |
| try |
| { |
| fs.delete(path, true); |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| } |
| |
| public static void writeFileIntegers(List<Integer> elements, FileSystem fs, Path path, boolean deleteOnExit) |
| { |
| try |
| { |
| // create writer |
| BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fs.create(path, true))); |
| |
| // write each element on a new line |
| for (Integer element : elements) |
| { |
| bw.write(element.toString()); |
| bw.newLine(); |
| } |
| bw.close(); |
| |
| // delete file once the filesystem is closed |
| if (deleteOnExit) |
| { |
| fs.deleteOnExit(path); |
| } |
| } catch (IOException e) |
| { |
| e.printStackTrace(); |
| } |
| |
| } |
| |
| } |