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annotate dwt/internal/Compatibility.d @ 212:ab60f3309436

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reverted the char[] to String and use the an alias.
author Frank Benoit <benoit@tionex.de>
date Mon, 05 May 2008 00:12:38 +0200
parents 57151e2793a2
children 36f5cb12e1a2
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212
ab60f3309436 reverted the char[] to String and use the an alias.
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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.text.MessageFormat;
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18 import java.util.MissingResourceException;
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19 import java.util.ResourceBundle;
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20 import java.util.zip.InflaterInputStream;
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21 +/
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22
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23 import dwt.DWT;
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24 public import dwt.dwthelper.FileInputStream;
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25 public import dwt.dwthelper.FileOutputStream;
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26 public import dwt.dwthelper.InflaterInputStream;
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27
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28 import Math = tango.math.Math;
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29 import Unicode = tango.text.Unicode;
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30 import tango.sys.Process;
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31 import dwt.dwthelper.utils;
2
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32
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33 /**
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34 * This class is a placeholder for utility methods commonly
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35 * used on J2SE platforms but not supported on some J2ME
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36 * profiles.
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37 * <p>
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38 * It is part of our effort to provide support for both J2SE
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39 * and J2ME platforms.
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40 * </p>
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41 * <p>
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42 * IMPORTANT: some of the methods have been modified from their
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43 * J2SE parents. Refer to the description of each method for
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44 * specific changes.
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45 * </p>
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46 * <ul>
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47 * <li>Exceptions thrown may differ since J2ME's set of
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48 * exceptions is a subset of J2SE's one.
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49 * </li>
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50 * <li>The range of the mathematic functions is subject to
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51 * change.
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52 * </li>
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53 * </ul>
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54 */
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55 public final class Compatibility {
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56
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57 /**
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58 * Returns the PI constant as a double.
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59 */
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60 public static const real PI = Math.PI;
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61
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62 static const real toRadians = PI / 180;
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63
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64 /**
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65 * Answers the length of the side adjacent to the given angle
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66 * of a right triangle. In other words, it returns the integer
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67 * conversion of length * cos (angle).
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68 * <p>
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69 * IMPORTANT: the j2me version has an additional restriction on
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70 * the argument. length must be between -32767 and 32767 (inclusive).
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71 * </p>
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72 *
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73 * @param angle the angle in degrees
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74 * @param length the length of the triangle's hypotenuse
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75 * @return the integer conversion of length * cos (angle)
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76 */
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77 public static int cos(int angle, int length) {
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78 return cast(int)(Math.cos(angle * toRadians) * length);
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79 }
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80
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81 /**
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82 * Answers the length of the side opposite to the given angle
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83 * of a right triangle. In other words, it returns the integer
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84 * conversion of length * sin (angle).
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85 * <p>
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86 * IMPORTANT: the j2me version has an additional restriction on
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87 * the argument. length must be between -32767 and 32767 (inclusive).
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88 * </p>
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89 *
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90 * @param angle the angle in degrees
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91 * @param length the length of the triangle's hypotenuse
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92 * @return the integer conversion of length * sin (angle)
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93 */
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94 public static int sin(int angle, int length) {
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95 return cast(int)(Math.sin(angle * toRadians) * length);
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96 }
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97
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98 /**
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99 * Answers the most negative (i.e. closest to negative infinity)
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100 * integer value which is greater than the number obtained by dividing
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101 * the first argument p by the second argument q.
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102 *
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103 * @param p numerator
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104 * @param q denominator (must be different from zero)
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105 * @return the ceiling of the rational number p / q.
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106 */
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107 public static int ceil(int p, int q) {
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108 return cast(int)Math.ceil(cast(float)p / q);
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109 }
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110
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111 /**
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112 * Answers the most positive (i.e. closest to positive infinity)
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113 * integer value which is less than the number obtained by dividing
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114 * the first argument p by the second argument q.
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115 *
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116 * @param p numerator
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117 * @param q denominator (must be different from zero)
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118 * @return the floor of the rational number p / q.
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119 */
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120 public static int floor(int p, int q) {
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121 return cast(int)Math.floor(cast(double)p / q);
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122 }
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123
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124 /**
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125 * Answers the result of rounding to the closest integer the number obtained
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126 * by dividing the first argument p by the second argument q.
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127 * <p>
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128 * IMPORTANT: the j2me version has an additional restriction on
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129 * the arguments. p must be within the range 0 - 32767 (inclusive).
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130 * q must be within the range 1 - 32767 (inclusive).
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131 * </p>
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132 *
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133 * @param p numerator
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134 * @param q denominator (must be different from zero)
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135 * @return the closest integer to the rational number p / q
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136 */
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137 public static int round(int p, int q) {
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138 return cast(int)Math.round(cast(float)p / q);
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139 }
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140
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141 /**
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142 * Returns 2 raised to the power of the argument.
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143 *
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144 * @param n an int value between 0 and 30 (inclusive)
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145 * @return 2 raised to the power of the argument
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146 *
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147 * @exception IllegalArgumentException <ul>
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148 * <li>ERROR_INVALID_RANGE - if the argument is not between 0 and 30 (inclusive)</li>
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149 * </ul>
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150 */
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151 public static int pow2(int n) {
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152 if (n >= 1 && n <= 30)
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153 return 2 << (n - 1);
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154 else if (n != 0) {
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155 DWT.error(DWT.ERROR_INVALID_RANGE);
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156 }
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157 return 1;
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158 }
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159
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160 /**
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161 * Open a file if such things are supported.
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162 *
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163 * @param filename the name of the file to open
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164 * @return a stream on the file if it could be opened.
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165 * @exception IOException
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166 */
212
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167 public static InputStream newFileInputStream(String filename) {
2
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168 return new FileInputStream(filename);
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169 }
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170
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171 /**
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172 * Open a file if such things are supported.
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173 *
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174 * @param filename the name of the file to open
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175 * @return a stream on the file if it could be opened.
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176 * @exception IOException
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177 */
212
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178 public static OutputStream newFileOutputStream(String filename) {
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179 return new FileOutputStream(filename);
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180 }
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181
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182 /**
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183 * Create an InflaterInputStream if such things are supported.
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184 *
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185 * @param stream the input stream
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186 * @return a inflater stream or <code>null</code>
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187 * @exception IOException
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188 *
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189 * @since 3.3
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190 */
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191 public static InflaterInputStream newInflaterInputStream(InputStream stream) {
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192 return new InflaterInputStream(stream);
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193 }
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194
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195 /**
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196 * Answers whether the character is a letter.
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197 *
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198 * @param c the character
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199 * @return true when the character is a letter
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200 */
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201 public static bool isLetter(dchar c) {
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202 return Unicode.isLetter(c);
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203 }
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204
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205 /**
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206 * Answers whether the character is a letter or a digit.
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207 *
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208 * @param c the character
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209 * @return true when the character is a letter or a digit
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210 */
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211 public static bool isLetterOrDigit(dchar c) {
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212 return Unicode.isLetterOrDigit(c);
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213 }
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214
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215 /**
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216 * Answers whether the character is a Unicode space character.
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217 *
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218 * @param c the character
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219 * @return true when the character is a Unicode space character
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220 */
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221 public static bool isSpaceChar(dchar c) {
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222 return Unicode.isSpace(c);
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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 whitespace character.
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227 *
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228 * @param c the character to test
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229 * @return true if the character is whitespace
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230 */
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231 public static bool isWhitespace(dchar c) {
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232 return Unicode.isWhitespace(c);
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233 }
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234
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235 /**
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236 * Execute a program in a separate platform process if the
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237 * underlying platform support this.
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238 * <p>
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239 * The new process inherits the environment of the caller.
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240 * </p>
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241 *
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242 * @param prog the name of the program to execute
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243 *
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244 * @exception ProcessException
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245 * if the program cannot be executed
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246 */
212
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247 public static void exec(String prog) {
2
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248 auto proc = new Process( prog );
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249 proc.execute;
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250 }
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251
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252 /**
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253 * Execute progArray[0] in a separate platform process if the
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254 * underlying platform support this.
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255 * <p>
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256 * The new process inherits the environment of the caller.
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257 * <p>
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258 *
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259 * @param progArray array containing the program to execute and its arguments
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260 *
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261 * @exception ProcessException
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262 * if the program cannot be executed
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263 */
212
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264 public static void exec(String[] progArray) {
2
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265 auto proc = new Process( progArray );
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266 proc.execute;
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267 }
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268 /++ PORTING_LEFT
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269 private static ResourceBundle msgs = null;
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270
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271 /**
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272 * Returns the NLS'ed message for the given argument. This is only being
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273 * called from DWT.
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274 *
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275 * @param key the key to look up
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276 * @return the message for the given key
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277 *
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278 * @see DWT#getMessage(String)
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279 */
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280 public static String getMessage(String key) {
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281 String answer = key;
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282
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283 if (key == null) {
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284 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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285 }
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286 if (msgs == null) {
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287 try {
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288 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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289 } catch (MissingResourceException ex) {
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290 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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291 }
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292 }
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293 if (msgs != null) {
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294 try {
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295 answer = msgs.getString(key);
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296 } catch (MissingResourceException ex2) {}
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297 }
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298 return answer;
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299 }
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300
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301 public static String getMessage(String key, Object[] args) {
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302 String answer = key;
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303
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304 if (key == null || args == null) {
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305 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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306 }
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307 if (msgs == null) {
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308 try {
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309 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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310 } catch (MissingResourceException ex) {
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311 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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312 }
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313 }
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314 if (msgs != null) {
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315 try {
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316 MessageFormat formatter = new MessageFormat("");
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317 formatter.applyPattern(msgs.getString(key));
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318 answer = formatter.format(args);
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319 } catch (MissingResourceException ex2) {}
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320 }
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321 return answer;
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322 }
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323 ++/
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324
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325
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326 /**
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327 * Interrupt the current thread.
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328 * <p>
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329 * Note that this is not available on CLDC.
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330 * </p>
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331 */
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332 public static void interrupt() {
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333 //PORTING_FIXME: how to implement??
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334 //Thread.currentThread().interrupt();
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335 }
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336
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337 /**
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338 * Compares two instances of class String ignoring the case of the
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339 * characters and answers if they are equal.
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340 *
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341 * @param s1 string
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342 * @param s2 string
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343 * @return true if the two instances of class String are equal
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344 */
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345 public static bool equalsIgnoreCase(String s1, String s2) {
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346 String s1b = new char[ s1.length ];
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347 String s2b = new char[ s1.length ];
2
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348 scope(exit){
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349 delete s1b;
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350 delete s2b;
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351 }
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352 String s1c = Unicode.toFold( s1, s1b );
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353 String s2c = Unicode.toFold( s2, s2b );
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354 return s1c == s2c;
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355 }
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356
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357 }