| /** |
| * 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.hdfs.tools.offlineImageViewer; |
| |
| import java.io.IOException; |
| import java.util.Date; |
| |
| /** |
| * IndentedImageVisitor walks over an FSImage and displays its structure |
| * using indenting to organize sections within the image file. |
| */ |
| class IndentedImageVisitor extends TextWriterImageVisitor { |
| |
| public IndentedImageVisitor(String filename) throws IOException { |
| super(filename); |
| } |
| |
| public IndentedImageVisitor(String filename, boolean printToScreen) throws IOException { |
| super(filename, printToScreen); |
| } |
| |
| final private DepthCounter dc = new DepthCounter();// to track leading spacing |
| |
| @Override |
| void start() throws IOException {} |
| |
| @Override |
| void finish() throws IOException { super.finish(); } |
| |
| @Override |
| void finishAbnormally() throws IOException { |
| System.out.println("*** Image processing finished abnormally. Ending ***"); |
| super.finishAbnormally(); |
| } |
| |
| @Override |
| void leaveEnclosingElement() throws IOException { |
| dc.decLevel(); |
| } |
| |
| @Override |
| void visit(ImageElement element, String value) throws IOException { |
| printIndents(); |
| write(element + " = " + value + "\n"); |
| } |
| |
| @Override |
| void visit(ImageElement element, long value) throws IOException { |
| if ((element == ImageElement.DELEGATION_TOKEN_IDENTIFIER_EXPIRY_TIME) || |
| (element == ImageElement.DELEGATION_TOKEN_IDENTIFIER_ISSUE_DATE) || |
| (element == ImageElement.DELEGATION_TOKEN_IDENTIFIER_MAX_DATE)) { |
| visit(element, new Date(value).toString()); |
| } else { |
| visit(element, Long.toString(value)); |
| } |
| } |
| |
| @Override |
| void visitEnclosingElement(ImageElement element) throws IOException { |
| printIndents(); |
| write(element + "\n"); |
| dc.incLevel(); |
| } |
| |
| // Print element, along with associated key/value pair, in brackets |
| @Override |
| void visitEnclosingElement(ImageElement element, |
| ImageElement key, String value) |
| throws IOException { |
| printIndents(); |
| write(element + " [" + key + " = " + value + "]\n"); |
| dc.incLevel(); |
| } |
| |
| /** |
| * Print an appropriate number of spaces for the current level. |
| * FsImages can potentially be millions of lines long, so caching can |
| * significantly speed up output. |
| */ |
| final private static String [] indents = { "", |
| " ", |
| " ", |
| " ", |
| " ", |
| " ", |
| " "}; |
| private void printIndents() throws IOException { |
| try { |
| write(indents[dc.getLevel()]); |
| } catch (IndexOutOfBoundsException e) { |
| // There's no reason in an fsimage would need a deeper indent |
| for(int i = 0; i < dc.getLevel(); i++) |
| write(" "); |
| } |
| } |
| } |