- /**
- * 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);}
- }
- }