1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.internal.tool; 27 28 import java.io.PrintWriter; 29 30 abstract class StructuredWriter { 31 private final static String LINE_SEPARATOR = String.format("%n"); 32 33 private final PrintWriter out; 34 private final StringBuilder builder = new StringBuilder(4000); 35 36 private char[] indentionArray = new char[0]; 37 private int indent = 0; 38 private int column; 39 // print first event immediately so tool feels responsive 40 private boolean first = true; 41 42 StructuredWriter(PrintWriter p) { 43 out = p; 44 } 45 46 final protected int getColumn() { 47 return column; 48 } 49 50 // Flush to print writer 51 public final void flush(boolean hard) { 52 if (hard) { 53 out.print(builder.toString()); 54 builder.setLength(0); 55 return; 56 } 57 if (first || builder.length() > 100_000) { 58 out.print(builder.toString()); 59 builder.setLength(0); 60 first = false; 61 } 62 } 63 64 final public void printIndent() { 65 builder.append(indentionArray, 0, indent); 66 column += indent; 67 } 68 69 final public void println() { 70 builder.append(LINE_SEPARATOR); 71 column = 0; 72 } 73 74 final public void print(String... texts) { 75 for (String text : texts) { 76 print(text); 77 } 78 } 79 80 final public void printAsString(Object o) { 81 print(String.valueOf(o)); 82 } 83 84 final public void print(String text) { 85 builder.append(text); 86 column += text.length(); 87 } 88 89 final public void print(char c) { 90 builder.append(c); 91 column++; 92 } 93 94 final public void print(int value) { 95 print(String.valueOf(value)); 96 } 97 98 final public void indent() { 99 indent += 2; 100 updateIndent(); 101 } 102 103 final public void retract() { 104 indent -= 2; 105 updateIndent(); 106 } 107 108 final public void println(String text) { 109 print(text); 110 println(); 111 } 112 113 private void updateIndent() { 114 if (indent > indentionArray.length) { 115 indentionArray = new char[indent]; 116 for (int i = 0; i < indentionArray.length; i++) { 117 indentionArray[i] = ' '; 118 } 119 } 120 } 121 }