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annotate dwt/internal/Compatibility.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
parents ab60f3309436
children fd9c62a2998e
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1 /*******************************************************************************
2
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.internal.Compatibility;
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14
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15 /+
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16 import java.io.*;
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17 import java.io.File;
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18 import java.text.MessageFormat;
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19 import java.util.MissingResourceException;
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20 import java.util.ResourceBundle;
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21 import java.util.zip.DeflaterOutputStream;
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22 import java.util.zip.InflaterInputStream;
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23 +/
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24
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25 import dwt.DWT;
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26 public import dwt.dwthelper.FileInputStream;
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27 public import dwt.dwthelper.FileOutputStream;
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28 public import dwt.dwthelper.InflaterInputStream;
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29
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30 import Math = tango.math.Math;
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31 import Unicode = tango.text.Unicode;
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32 import tango.sys.Process;
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33 import dwt.dwthelper.utils;
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34 import tango.io.Path;
2
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35
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36 /**
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37 * This class is a placeholder for utility methods commonly
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38 * used on J2SE platforms but not supported on some J2ME
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39 * profiles.
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40 * <p>
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41 * It is part of our effort to provide support for both J2SE
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42 * and J2ME platforms.
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43 * </p>
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44 * <p>
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45 * IMPORTANT: some of the methods have been modified from their
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46 * J2SE parents. Refer to the description of each method for
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47 * specific changes.
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48 * </p>
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49 * <ul>
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50 * <li>Exceptions thrown may differ since J2ME's set of
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51 * exceptions is a subset of J2SE's one.
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52 * </li>
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53 * <li>The range of the mathematic functions is subject to
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54 * change.
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55 * </li>
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56 * </ul>
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57 */
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58 public final class Compatibility {
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59
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60 /**
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61 * Returns the PI constant as a double.
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62 */
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63 public static const real PI = Math.PI;
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64
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65 static const real toRadians = PI / 180;
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66
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67 /**
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68 * Answers the length of the side adjacent to the given angle
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69 * of a right triangle. In other words, it returns the integer
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70 * conversion of length * cos (angle).
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71 * <p>
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72 * IMPORTANT: the j2me version has an additional restriction on
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73 * the argument. length must be between -32767 and 32767 (inclusive).
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74 * </p>
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75 *
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76 * @param angle the angle in degrees
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77 * @param length the length of the triangle's hypotenuse
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78 * @return the integer conversion of length * cos (angle)
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79 */
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80 public static int cos(int angle, int length) {
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81 return cast(int)(Math.cos(angle * toRadians) * length);
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82 }
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83
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84 /**
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85 * Answers the length of the side opposite to the given angle
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86 * of a right triangle. In other words, it returns the integer
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87 * conversion of length * sin (angle).
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88 * <p>
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89 * IMPORTANT: the j2me version has an additional restriction on
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90 * the argument. length must be between -32767 and 32767 (inclusive).
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91 * </p>
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92 *
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93 * @param angle the angle in degrees
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94 * @param length the length of the triangle's hypotenuse
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95 * @return the integer conversion of length * sin (angle)
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96 */
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97 public static int sin(int angle, int length) {
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98 return cast(int)(Math.sin(angle * toRadians) * length);
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99 }
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100
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101 /**
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102 * Answers the most negative (i.e. closest to negative infinity)
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103 * integer value which is greater than the number obtained by dividing
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104 * the first argument p by the second argument q.
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105 *
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106 * @param p numerator
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107 * @param q denominator (must be different from zero)
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108 * @return the ceiling of the rational number p / q.
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109 */
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110 public static int ceil(int p, int q) {
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111 return cast(int)Math.ceil(cast(float)p / q);
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112 }
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113
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114 /**
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115 * Answers whether the indicated file exists or not.
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116 *
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117 * @param parent the file's parent directory
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118 * @param child the file's name
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119 * @return true if the file exists
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120 */
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121 public static bool fileExists(String parent, String child) {
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122 return FS.exists( FS.join(parent, child));
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123 }
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124
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125 /**
2
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126 * Answers the most positive (i.e. closest to positive infinity)
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127 * integer value which is less than the number obtained by dividing
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128 * the first argument p by the second argument q.
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129 *
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130 * @param p numerator
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131 * @param q denominator (must be different from zero)
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132 * @return the floor of the rational number p / q.
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133 */
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134 public static int floor(int p, int q) {
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135 return cast(int)Math.floor(cast(double)p / q);
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136 }
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137
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138 /**
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139 * Answers the result of rounding to the closest integer the number obtained
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140 * by dividing the first argument p by the second argument q.
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141 * <p>
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142 * IMPORTANT: the j2me version has an additional restriction on
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143 * the arguments. p must be within the range 0 - 32767 (inclusive).
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144 * q must be within the range 1 - 32767 (inclusive).
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145 * </p>
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146 *
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147 * @param p numerator
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148 * @param q denominator (must be different from zero)
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149 * @return the closest integer to the rational number p / q
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150 */
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151 public static int round(int p, int q) {
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152 return cast(int)Math.round(cast(float)p / q);
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153 }
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154
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155 /**
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156 * Returns 2 raised to the power of the argument.
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157 *
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158 * @param n an int value between 0 and 30 (inclusive)
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159 * @return 2 raised to the power of the argument
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160 *
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161 * @exception IllegalArgumentException <ul>
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162 * <li>ERROR_INVALID_RANGE - if the argument is not between 0 and 30 (inclusive)</li>
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163 * </ul>
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164 */
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165 public static int pow2(int n) {
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166 if (n >= 1 && n <= 30)
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167 return 2 << (n - 1);
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168 else if (n != 0) {
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169 DWT.error(DWT.ERROR_INVALID_RANGE);
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170 }
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171 return 1;
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172 }
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173
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174 /**
213
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175 * Create an DeflaterOutputStream if such things are supported.
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176 *
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177 * @param stream the output stream
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178 * @return a deflater stream or <code>null</code>
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179 * @exception IOException
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180 *
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181 * @since 3.4
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182 */
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183 public static OutputStream newDeflaterOutputStream(OutputStream stream) {
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184 //DWT_TODO
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185 implMissing(__FILE__,__LINE__);
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186 return null;
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187 //return new DeflaterOutputStream(stream);
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188 }
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189
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190 /**
2
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191 * Open a file if such things are supported.
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192 *
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193 * @param filename the name of the file to open
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194 * @return a stream on the file if it could be opened.
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195 * @exception IOException
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196 */
212
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197 public static InputStream newFileInputStream(String filename) {
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198 return new FileInputStream(filename);
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199 }
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200
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201 /**
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202 * Open a file if such things are supported.
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203 *
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204 * @param filename the name of the file to open
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205 * @return a stream on the file if it could be opened.
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206 * @exception IOException
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207 */
212
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208 public static OutputStream newFileOutputStream(String filename) {
2
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209 return new FileOutputStream(filename);
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210 }
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211
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212 /**
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213 * Create an InflaterInputStream if such things are supported.
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214 *
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215 * @param stream the input stream
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216 * @return a inflater stream or <code>null</code>
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217 * @exception IOException
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218 *
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219 * @since 3.3
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220 */
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221 public static InflaterInputStream newInflaterInputStream(InputStream stream) {
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222 return new InflaterInputStream(stream);
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223 }
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224
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225 /**
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226 * Answers whether the character is a letter.
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227 *
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228 * @param c the character
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229 * @return true when the character is a letter
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230 */
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231 public static bool isLetter(dchar c) {
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232 return Unicode.isLetter(c);
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233 }
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234
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235 /**
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236 * Answers whether the character is a letter or a digit.
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237 *
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238 * @param c the character
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239 * @return true when the character is a letter or a digit
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240 */
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241 public static bool isLetterOrDigit(dchar c) {
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242 return Unicode.isLetterOrDigit(c);
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243 }
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244
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245 /**
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246 * Answers whether the character is a Unicode space character.
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247 *
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248 * @param c the character
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249 * @return true when the character is a Unicode space character
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250 */
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251 public static bool isSpaceChar(dchar c) {
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252 return Unicode.isSpace(c);
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253 }
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254
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255 /**
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256 * Answers whether the character is a whitespace character.
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257 *
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258 * @param c the character to test
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259 * @return true if the character is whitespace
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260 */
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261 public static bool isWhitespace(dchar c) {
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262 return Unicode.isWhitespace(c);
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263 }
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264
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265 /**
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266 * Execute a program in a separate platform process if the
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267 * underlying platform support this.
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268 * <p>
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269 * The new process inherits the environment of the caller.
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270 * </p>
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271 *
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272 * @param prog the name of the program to execute
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273 *
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274 * @exception ProcessException
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275 * if the program cannot be executed
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276 */
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277 public static void exec(String prog) {
2
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278 auto proc = new Process( prog );
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279 proc.execute;
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280 }
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281
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282 /**
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283 * Execute progArray[0] in a separate platform process if the
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284 * underlying platform support this.
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285 * <p>
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286 * The new process inherits the environment of the caller.
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287 * <p>
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288 *
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289 * @param progArray array containing the program to execute and its arguments
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290 *
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291 * @exception ProcessException
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292 * if the program cannot be executed
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293 */
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294 public static void exec(String[] progArray) {
2
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295 auto proc = new Process( progArray );
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296 proc.execute;
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297 }
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298 /++ PORTING_LEFT
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299 private static ResourceBundle msgs = null;
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300
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301 /**
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302 * Returns the NLS'ed message for the given argument. This is only being
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303 * called from DWT.
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304 *
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305 * @param key the key to look up
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306 * @return the message for the given key
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307 *
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308 * @see DWT#getMessage(String)
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309 */
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310 public static String getMessage(String key) {
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311 String answer = key;
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312
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313 if (key == null) {
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314 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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315 }
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316 if (msgs == null) {
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317 try {
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318 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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319 } catch (MissingResourceException ex) {
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320 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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321 }
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322 }
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323 if (msgs != null) {
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324 try {
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325 answer = msgs.getString(key);
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326 } catch (MissingResourceException ex2) {}
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327 }
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328 return answer;
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329 }
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330
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331 public static String getMessage(String key, Object[] args) {
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332 String answer = key;
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333
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334 if (key == null || args == null) {
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335 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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336 }
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337 if (msgs == null) {
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338 try {
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339 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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340 } catch (MissingResourceException ex) {
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341 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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342 }
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343 }
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344 if (msgs != null) {
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345 try {
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346 MessageFormat formatter = new MessageFormat("");
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347 formatter.applyPattern(msgs.getString(key));
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348 answer = formatter.format(args);
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349 } catch (MissingResourceException ex2) {}
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350 }
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351 return answer;
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352 }
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353 ++/
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354
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355
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356 /**
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357 * Interrupt the current thread.
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358 * <p>
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359 * Note that this is not available on CLDC.
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360 * </p>
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361 */
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362 public static void interrupt() {
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363 //PORTING_FIXME: how to implement??
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364 //Thread.currentThread().interrupt();
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365 }
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366
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367 /**
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368 * Compares two instances of class String ignoring the case of the
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369 * characters and answers if they are equal.
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370 *
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371 * @param s1 string
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372 * @param s2 string
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373 * @return true if the two instances of class String are equal
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374 */
212
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375 public static bool equalsIgnoreCase(String s1, String s2) {
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376 String s1b = new char[ s1.length ];
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377 String s2b = new char[ s1.length ];
2
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378 scope(exit){
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379 delete s1b;
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380 delete s2b;
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381 }
212
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382 String s1c = Unicode.toFold( s1, s1b );
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383 String s2c = Unicode.toFold( s2, s2b );
2
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384 return s1c == s2c;
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385 }
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386
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387 }