| /** |
| * 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.hadoop.tools; |
| |
| import java.io.BufferedReader; |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.InvalidInputException; |
| import org.apache.hadoop.mapred.JobConf; |
| |
| /** |
| * An abstract class for distributed tool for file related operations. |
| */ |
| abstract class DistTool implements org.apache.hadoop.util.Tool { |
| protected static final Log LOG = LogFactory.getLog(DistTool.class); |
| |
| protected JobConf jobconf; |
| |
| /** {@inheritDoc} */ |
| public void setConf(Configuration conf) { |
| if (jobconf != conf) { |
| jobconf = conf instanceof JobConf? (JobConf)conf: new JobConf(conf); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public JobConf getConf() {return jobconf;} |
| |
| protected DistTool(Configuration conf) {setConf(conf);} |
| |
| private static final Random RANDOM = new Random(); |
| protected static String getRandomId() { |
| return Integer.toString(RANDOM.nextInt(Integer.MAX_VALUE), 36); |
| } |
| |
| /** Sanity check for source */ |
| protected static void checkSource(Configuration conf, List<Path> srcs |
| ) throws InvalidInputException { |
| List<IOException> ioes = new ArrayList<IOException>(); |
| for(Path p : srcs) { |
| try { |
| if (!p.getFileSystem(conf).exists(p)) { |
| ioes.add(new FileNotFoundException("Source "+p+" does not exist.")); |
| } |
| } |
| catch(IOException e) {ioes.add(e);} |
| } |
| if (!ioes.isEmpty()) { |
| throw new InvalidInputException(ioes); |
| } |
| } |
| |
| protected static String readString(DataInput in) throws IOException { |
| if (in.readBoolean()) { |
| return Text.readString(in); |
| } |
| return null; |
| } |
| |
| protected static void writeString(DataOutput out, String s |
| ) throws IOException { |
| boolean b = s != null; |
| out.writeBoolean(b); |
| if (b) {Text.writeString(out, s);} |
| } |
| |
| protected static List<String> readFile(Configuration conf, Path inputfile |
| ) throws IOException { |
| List<String> result = new ArrayList<String>(); |
| FileSystem fs = inputfile.getFileSystem(conf); |
| BufferedReader input = null; |
| try { |
| input = new BufferedReader(new InputStreamReader(fs.open(inputfile))); |
| for(String line; (line = input.readLine()) != null;) { |
| result.add(line); |
| } |
| } finally { |
| input.close(); |
| } |
| return result; |
| } |
| |
| /** An exception class for duplicated source files. */ |
| public static class DuplicationException extends IOException { |
| private static final long serialVersionUID = 1L; |
| /** Error code for this exception */ |
| public static final int ERROR_CODE = -2; |
| DuplicationException(String message) {super(message);} |
| } |
| } |