Mercurial > hg > truffle

annotate graal/com.oracle.max.base/src/com/sun/max/io/IndentWriter.java @ 4222:8e2985cdaaa5

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Renaming of VMExits and VMEntries part 3.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 04 Jan 2012 21:13:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.io;
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24
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25 import java.io.*;
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26
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27 import com.sun.max.program.*;
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28
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29 /**
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30 * A line oriented character writer that indents line output on the left.
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31 */
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32 public class IndentWriter {
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33
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34 private final PrintWriter writer;
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35 private int lineCount;
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36
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37 /**
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38 * Gets an IndentWriter that wraps the {@linkplain Trace#stream() trace stream}.
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39 * @return
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40 */
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41 public static IndentWriter traceStreamWriter() {
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42 return new IndentWriter(new OutputStreamWriter(Trace.stream()));
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43 }
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44
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45 public IndentWriter(Writer writer) {
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46 this.writer = (writer instanceof PrintWriter) ? (PrintWriter) writer : new PrintWriter(writer);
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47 }
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48
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49 public void close() {
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50 writer.close();
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51 }
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52
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53 public void flush() {
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54 writer.flush();
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55 }
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56
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57 private int indentation = 4;
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58
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59 public int indentation() {
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60 return indentation;
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61 }
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62
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63 public void setIndentation(int indentation) {
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64 this.indentation = indentation;
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65 }
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66
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67 private int prefix;
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68
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69 public void indent() {
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70 prefix += indentation;
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71 }
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72
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73 public void outdent() {
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74 prefix -= indentation;
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75 assert prefix >= 0;
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76 }
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77
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78 private boolean isCurrentLineIndented;
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79
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80 private void writeIndentation() {
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81 if (!isCurrentLineIndented) {
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82 for (int i = 0; i < prefix; i++) {
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83 writer.print(" ");
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84 }
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85 isCurrentLineIndented = true;
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86 }
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87 }
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88
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89 public void printSpaces(int width) {
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90 for (int i = 0; i < width; i++) {
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91 writer.print(" ");
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92 }
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93 }
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94
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95 public void printFixedWidth(String s, int width) {
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96 assert width > 0 : "width must be positive";
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97 String text = s;
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98 if (text.length() + 1 > width) {
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99 if (width - 4 > 0) {
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100 text = s.substring(0, width - 4) + "...";
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101 } else {
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102 text = s.substring(0, width);
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103 }
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104 }
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105 writer.print(text);
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106 printSpaces(width - text.length());
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107 }
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108
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109 public void print(String s) {
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110 writeIndentation();
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111 writer.print(s);
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112 }
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113
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114 public void println() {
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115 writer.println();
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116 isCurrentLineIndented = false;
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117 ++lineCount;
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118 }
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119
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120 public void println(String s) {
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121 writeIndentation();
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122 writer.println(s);
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123 isCurrentLineIndented = false;
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124 ++lineCount;
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125 }
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126
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127 public void printLines(InputStream inputStream) {
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128 printLines(new InputStreamReader(inputStream));
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129 }
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130
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131 public void printLines(Reader reader) {
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132 final BufferedReader bufferedReader = reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader);
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133 String line;
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134 try {
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135 while ((line = bufferedReader.readLine()) != null) {
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136 println(line);
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137 }
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138 } catch (IOException e) {
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139 ProgramWarning.message(e.toString());
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140 }
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141 }
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142
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143 public int lineCount() {
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144 return lineCount;
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145 }
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146 }