001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hdfs.tools.offlineImageViewer;
019
020import org.apache.hadoop.fs.Path;
021import org.apache.hadoop.fs.permission.PermissionStatus;
022import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.INode;
023import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.INodeDirectory;
024import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.INodeFile;
025import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.INodeSymlink;
026
027import java.io.IOException;
028import java.io.PrintStream;
029import java.text.SimpleDateFormat;
030import java.util.Date;
031
032/**
033 * A PBImageDelimitedTextWriter generates a text representation of the PB fsimage,
034 * with each element separated by a delimiter string.  All of the elements
035 * common to both inodes and inodes-under-construction are included. When
036 * processing an fsimage with a layout version that did not include an
037 * element, such as AccessTime, the output file will include a column
038 * for the value, but no value will be included.
039 *
040 * Individual block information for each file is not currently included.
041 *
042 * The default delimiter is tab, as this is an unlikely value to be included in
043 * an inode path or other text metadata. The delimiter value can be via the
044 * constructor.
045 */
046public class PBImageDelimitedTextWriter extends PBImageTextWriter {
047  static final String DEFAULT_DELIMITER = "\t";
048  private static final String DATE_FORMAT="yyyy-MM-dd HH:mm";
049  private final SimpleDateFormat dateFormatter =
050      new SimpleDateFormat(DATE_FORMAT);
051
052  private final String delimiter;
053
054  PBImageDelimitedTextWriter(PrintStream out, String delimiter, String tempPath)
055      throws IOException {
056    super(out, tempPath);
057    this.delimiter = delimiter;
058  }
059
060  private String formatDate(long date) {
061    return dateFormatter.format(new Date(date));
062  }
063
064  private void append(StringBuffer buffer, int field) {
065    buffer.append(delimiter);
066    buffer.append(field);
067  }
068
069  private void append(StringBuffer buffer, long field) {
070    buffer.append(delimiter);
071    buffer.append(field);
072  }
073
074  private void append(StringBuffer buffer, String field) {
075    buffer.append(delimiter);
076    buffer.append(field);
077  }
078
079  @Override
080  public String getEntry(String parent, INode inode) {
081    StringBuffer buffer = new StringBuffer();
082    String inodeName = inode.getName().toStringUtf8();
083    Path path = new Path(parent.isEmpty() ? "/" : parent,
084      inodeName.isEmpty() ? "/" : inodeName);
085    buffer.append(path.toString());
086    PermissionStatus p = null;
087
088    switch (inode.getType()) {
089    case FILE:
090      INodeFile file = inode.getFile();
091      p = getPermission(file.getPermission());
092      append(buffer, file.getReplication());
093      append(buffer, formatDate(file.getModificationTime()));
094      append(buffer, formatDate(file.getAccessTime()));
095      append(buffer, file.getPreferredBlockSize());
096      append(buffer, file.getBlocksCount());
097      append(buffer, FSImageLoader.getFileSize(file));
098      append(buffer, 0);  // NS_QUOTA
099      append(buffer, 0);  // DS_QUOTA
100      break;
101    case DIRECTORY:
102      INodeDirectory dir = inode.getDirectory();
103      p = getPermission(dir.getPermission());
104      append(buffer, 0);  // Replication
105      append(buffer, formatDate(dir.getModificationTime()));
106      append(buffer, formatDate(0));  // Access time.
107      append(buffer, 0);  // Block size.
108      append(buffer, 0);  // Num blocks.
109      append(buffer, 0);  // Num bytes.
110      append(buffer, dir.getNsQuota());
111      append(buffer, dir.getDsQuota());
112      break;
113    case SYMLINK:
114      INodeSymlink s = inode.getSymlink();
115      p = getPermission(s.getPermission());
116      append(buffer, 0);  // Replication
117      append(buffer, formatDate(s.getModificationTime()));
118      append(buffer, formatDate(s.getAccessTime()));
119      append(buffer, 0);  // Block size.
120      append(buffer, 0);  // Num blocks.
121      append(buffer, 0);  // Num bytes.
122      append(buffer, 0);  // NS_QUOTA
123      append(buffer, 0);  // DS_QUOTA
124      break;
125    default:
126      break;
127    }
128    assert p != null;
129    append(buffer, p.getPermission().toString());
130    append(buffer, p.getUserName());
131    append(buffer, p.getGroupName());
132    return buffer.toString();
133  }
134}