| /** |
| * 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.fs.shell; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.LinkedList; |
| import java.util.zip.GZIPInputStream; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.shell.PathExceptions.PathIsDirectoryException; |
| import org.apache.hadoop.io.DataInputBuffer; |
| import org.apache.hadoop.io.DataOutputBuffer; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.io.SequenceFile; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.compress.CompressionCodec; |
| import org.apache.hadoop.io.compress.CompressionCodecFactory; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * Display contents of files |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| |
| class Display extends FsCommand { |
| public static void registerCommands(CommandFactory factory) { |
| factory.addClass(Cat.class, "-cat"); |
| factory.addClass(Text.class, "-text"); |
| } |
| |
| /** |
| * Displays file content to stdout |
| */ |
| public static class Cat extends Display { |
| public static final String NAME = "cat"; |
| public static final String USAGE = "[-ignoreCrc] <src> ..."; |
| public static final String DESCRIPTION = |
| "Fetch all files that match the file pattern <src> \n" + |
| "and display their content on stdout.\n"; |
| |
| private boolean verifyChecksum = true; |
| |
| @Override |
| protected void processOptions(LinkedList<String> args) |
| throws IOException { |
| CommandFormat cf = new CommandFormat(1, Integer.MAX_VALUE, "ignoreCrc"); |
| cf.parse(args); |
| verifyChecksum = !cf.getOpt("ignoreCrc"); |
| } |
| |
| @Override |
| protected void processPath(PathData item) throws IOException { |
| if (item.stat.isDirectory()) { |
| throw new PathIsDirectoryException(item.toString()); |
| } |
| |
| item.fs.setVerifyChecksum(verifyChecksum); |
| printToStdout(getInputStream(item)); |
| } |
| |
| private void printToStdout(InputStream in) throws IOException { |
| try { |
| IOUtils.copyBytes(in, out, getConf(), false); |
| } finally { |
| in.close(); |
| } |
| } |
| |
| protected InputStream getInputStream(PathData item) throws IOException { |
| return item.fs.open(item.path); |
| } |
| } |
| |
| /** |
| * Same behavior as "-cat", but handles zip and TextRecordInputStream |
| * encodings. |
| */ |
| public static class Text extends Cat { |
| public static final String NAME = "text"; |
| public static final String USAGE = Cat.USAGE; |
| public static final String DESCRIPTION = |
| "Takes a source file and outputs the file in text format.\n" + |
| "The allowed formats are zip and TextRecordInputStream."; |
| |
| @Override |
| protected InputStream getInputStream(PathData item) throws IOException { |
| FSDataInputStream i = (FSDataInputStream)super.getInputStream(item); |
| |
| // check codecs |
| CompressionCodecFactory cf = new CompressionCodecFactory(getConf()); |
| CompressionCodec codec = cf.getCodec(item.path); |
| if (codec != null) { |
| return codec.createInputStream(i); |
| } |
| |
| switch(i.readShort()) { |
| case 0x1f8b: { // RFC 1952 |
| i.seek(0); |
| return new GZIPInputStream(i); |
| } |
| case 0x5345: { // 'S' 'E' |
| if (i.readByte() == 'Q') { |
| i.close(); |
| return new TextRecordInputStream(item.stat); |
| } |
| break; |
| } |
| } |
| i.seek(0); |
| return i; |
| } |
| } |
| |
| protected class TextRecordInputStream extends InputStream { |
| SequenceFile.Reader r; |
| WritableComparable<?> key; |
| Writable val; |
| |
| DataInputBuffer inbuf; |
| DataOutputBuffer outbuf; |
| |
| public TextRecordInputStream(FileStatus f) throws IOException { |
| final Path fpath = f.getPath(); |
| final Configuration lconf = getConf(); |
| r = new SequenceFile.Reader(lconf, |
| SequenceFile.Reader.file(fpath)); |
| key = ReflectionUtils.newInstance( |
| r.getKeyClass().asSubclass(WritableComparable.class), lconf); |
| val = ReflectionUtils.newInstance( |
| r.getValueClass().asSubclass(Writable.class), lconf); |
| inbuf = new DataInputBuffer(); |
| outbuf = new DataOutputBuffer(); |
| } |
| |
| public int read() throws IOException { |
| int ret; |
| if (null == inbuf || -1 == (ret = inbuf.read())) { |
| if (!r.next(key, val)) { |
| return -1; |
| } |
| byte[] tmp = key.toString().getBytes(); |
| outbuf.write(tmp, 0, tmp.length); |
| outbuf.write('\t'); |
| tmp = val.toString().getBytes(); |
| outbuf.write(tmp, 0, tmp.length); |
| outbuf.write('\n'); |
| inbuf.reset(outbuf.getData(), outbuf.getLength()); |
| outbuf.reset(); |
| ret = inbuf.read(); |
| } |
| return ret; |
| } |
| |
| public void close() throws IOException { |
| r.close(); |
| super.close(); |
| } |
| } |
| } |