[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.fs.shell; |
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| 19 | |
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| 20 | import java.io.*; |
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| 21 | |
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| 22 | import org.apache.hadoop.conf.Configuration; |
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| 23 | import org.apache.hadoop.conf.Configured; |
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| 24 | import org.apache.hadoop.fs.FileStatus; |
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| 25 | import org.apache.hadoop.fs.FileSystem; |
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| 26 | import org.apache.hadoop.fs.Path; |
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| 27 | import org.apache.hadoop.ipc.RemoteException; |
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| 28 | |
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| 29 | /** |
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| 30 | * An abstract class for the execution of a file system command |
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| 31 | */ |
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| 32 | abstract public class Command extends Configured { |
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| 33 | protected String[] args; |
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| 34 | |
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| 35 | /** Constructor */ |
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| 36 | protected Command(Configuration conf) { |
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| 37 | super(conf); |
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| 38 | } |
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| 39 | |
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| 40 | /** Return the command's name excluding the leading character - */ |
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| 41 | abstract public String getCommandName(); |
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| 42 | |
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| 43 | /** |
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| 44 | * Execute the command on the input path |
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| 45 | * |
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| 46 | * @param path the input path |
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| 47 | * @throws IOException if any error occurs |
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| 48 | */ |
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| 49 | abstract protected void run(Path path) throws IOException; |
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| 50 | |
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| 51 | /** |
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| 52 | * For each source path, execute the command |
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| 53 | * |
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| 54 | * @return 0 if it runs successfully; -1 if it fails |
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| 55 | */ |
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| 56 | public int runAll() { |
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| 57 | int exitCode = 0; |
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| 58 | for (String src : args) { |
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| 59 | try { |
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| 60 | Path srcPath = new Path(src); |
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| 61 | FileSystem fs = srcPath.getFileSystem(getConf()); |
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| 62 | FileStatus[] statuses = fs.globStatus(srcPath); |
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| 63 | if (statuses == null) { |
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| 64 | System.err.println("Can not find listing for " + src); |
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| 65 | exitCode = -1; |
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| 66 | } else { |
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| 67 | for(FileStatus s : statuses) { |
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| 68 | run(s.getPath()); |
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| 69 | } |
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| 70 | } |
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| 71 | } catch (RemoteException re) { |
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| 72 | exitCode = -1; |
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| 73 | String content = re.getLocalizedMessage(); |
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| 74 | int eol = content.indexOf('\n'); |
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| 75 | if (eol>=0) { |
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| 76 | content = content.substring(0, eol); |
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| 77 | } |
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| 78 | System.err.println(getCommandName() + ": " + content); |
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| 79 | } catch (IOException e) { |
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| 80 | exitCode = -1; |
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| 81 | System.err.println(getCommandName() + ": " + e.getLocalizedMessage()); |
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| 82 | } |
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| 83 | } |
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| 84 | return exitCode; |
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| 85 | } |
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| 86 | } |
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