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annotate dwt/internal/Compatibility.d @ 2:57151e2793a2

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More common modules from dwt-linux
author Frank Benoit <benoit@tionex.de>
date Wed, 23 Jan 2008 12:01:46 +0100
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children ab60f3309436
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1 /*******************************************************************************
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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
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32 /**
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33 * This class is a placeholder for utility methods commonly
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34 * used on J2SE platforms but not supported on some J2ME
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35 * profiles.
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36 * <p>
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37 * It is part of our effort to provide support for both J2SE
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38 * and J2ME platforms.
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39 * </p>
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40 * <p>
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41 * IMPORTANT: some of the methods have been modified from their
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42 * J2SE parents. Refer to the description of each method for
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43 * specific changes.
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44 * </p>
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45 * <ul>
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46 * <li>Exceptions thrown may differ since J2ME's set of
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47 * exceptions is a subset of J2SE's one.
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48 * </li>
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49 * <li>The range of the mathematic functions is subject to
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50 * change.
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51 * </li>
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52 * </ul>
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53 */
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54 public final class Compatibility {
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55
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56 /**
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57 * Returns the PI constant as a double.
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58 */
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59 public static const real PI = Math.PI;
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60
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61 static const real toRadians = PI / 180;
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62
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63 /**
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64 * Answers the length of the side adjacent to the given angle
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65 * of a right triangle. In other words, it returns the integer
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66 * conversion of length * cos (angle).
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67 * <p>
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68 * IMPORTANT: the j2me version has an additional restriction on
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69 * the argument. length must be between -32767 and 32767 (inclusive).
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70 * </p>
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71 *
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72 * @param angle the angle in degrees
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73 * @param length the length of the triangle's hypotenuse
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74 * @return the integer conversion of length * cos (angle)
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75 */
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76 public static int cos(int angle, int length) {
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77 return cast(int)(Math.cos(angle * toRadians) * length);
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78 }
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79
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80 /**
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81 * Answers the length of the side opposite to the given angle
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82 * of a right triangle. In other words, it returns the integer
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83 * conversion of length * sin (angle).
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84 * <p>
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85 * IMPORTANT: the j2me version has an additional restriction on
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86 * the argument. length must be between -32767 and 32767 (inclusive).
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87 * </p>
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88 *
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89 * @param angle the angle in degrees
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90 * @param length the length of the triangle's hypotenuse
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91 * @return the integer conversion of length * sin (angle)
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92 */
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93 public static int sin(int angle, int length) {
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94 return cast(int)(Math.sin(angle * toRadians) * length);
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95 }
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96
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97 /**
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98 * Answers the most negative (i.e. closest to negative infinity)
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99 * integer value which is greater than the number obtained by dividing
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100 * the first argument p by the second argument q.
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101 *
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102 * @param p numerator
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103 * @param q denominator (must be different from zero)
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104 * @return the ceiling of the rational number p / q.
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105 */
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106 public static int ceil(int p, int q) {
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107 return cast(int)Math.ceil(cast(float)p / q);
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108 }
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109
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110 /**
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111 * Answers the most positive (i.e. closest to positive infinity)
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112 * integer value which is less than the number obtained by dividing
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113 * the first argument p by the second argument q.
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114 *
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115 * @param p numerator
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116 * @param q denominator (must be different from zero)
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117 * @return the floor of the rational number p / q.
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118 */
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119 public static int floor(int p, int q) {
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120 return cast(int)Math.floor(cast(double)p / q);
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121 }
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122
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123 /**
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124 * Answers the result of rounding to the closest integer the number obtained
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125 * by dividing the first argument p by the second argument q.
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126 * <p>
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127 * IMPORTANT: the j2me version has an additional restriction on
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128 * the arguments. p must be within the range 0 - 32767 (inclusive).
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129 * q must be within the range 1 - 32767 (inclusive).
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130 * </p>
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131 *
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132 * @param p numerator
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133 * @param q denominator (must be different from zero)
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134 * @return the closest integer to the rational number p / q
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135 */
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136 public static int round(int p, int q) {
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137 return cast(int)Math.round(cast(float)p / q);
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138 }
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139
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140 /**
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141 * Returns 2 raised to the power of the argument.
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142 *
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143 * @param n an int value between 0 and 30 (inclusive)
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144 * @return 2 raised to the power of the argument
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145 *
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146 * @exception IllegalArgumentException <ul>
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147 * <li>ERROR_INVALID_RANGE - if the argument is not between 0 and 30 (inclusive)</li>
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148 * </ul>
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149 */
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150 public static int pow2(int n) {
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151 if (n >= 1 && n <= 30)
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152 return 2 << (n - 1);
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153 else if (n != 0) {
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154 DWT.error(DWT.ERROR_INVALID_RANGE);
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155 }
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156 return 1;
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157 }
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158
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159 /**
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160 * Open a file if such things are supported.
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161 *
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162 * @param filename the name of the file to open
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163 * @return a stream on the file if it could be opened.
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164 * @exception IOException
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165 */
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166 public static InputStream newFileInputStream(char[] filename) {
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167 return new FileInputStream(filename);
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168 }
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169
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170 /**
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171 * Open a file if such things are supported.
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172 *
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173 * @param filename the name of the file to open
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174 * @return a stream on the file if it could be opened.
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175 * @exception IOException
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176 */
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177 public static OutputStream newFileOutputStream(char[] filename) {
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178 return new FileOutputStream(filename);
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179 }
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180
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181 /**
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182 * Create an InflaterInputStream if such things are supported.
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183 *
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184 * @param stream the input stream
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185 * @return a inflater stream or <code>null</code>
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186 * @exception IOException
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187 *
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188 * @since 3.3
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189 */
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190 public static InflaterInputStream newInflaterInputStream(InputStream stream) {
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191 return new InflaterInputStream(stream);
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192 }
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193
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194 /**
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195 * Answers whether the character is a letter.
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196 *
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197 * @param c the character
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198 * @return true when the character is a letter
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199 */
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200 public static bool isLetter(dchar c) {
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201 return Unicode.isLetter(c);
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202 }
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203
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204 /**
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205 * Answers whether the character is a letter or a digit.
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206 *
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207 * @param c the character
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208 * @return true when the character is a letter or a digit
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209 */
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210 public static bool isLetterOrDigit(dchar c) {
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211 return Unicode.isLetterOrDigit(c);
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212 }
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213
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214 /**
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215 * Answers whether the character is a Unicode space character.
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216 *
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217 * @param c the character
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218 * @return true when the character is a Unicode space character
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219 */
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220 public static bool isSpaceChar(dchar c) {
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221 return Unicode.isSpace(c);
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222 }
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223
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224 /**
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225 * Answers whether the character is a whitespace character.
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226 *
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227 * @param c the character to test
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228 * @return true if the character is whitespace
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229 */
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230 public static bool isWhitespace(dchar c) {
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231 return Unicode.isWhitespace(c);
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232 }
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233
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234 /**
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235 * Execute a program in a separate platform process if the
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236 * underlying platform support this.
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237 * <p>
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238 * The new process inherits the environment of the caller.
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239 * </p>
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240 *
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241 * @param prog the name of the program to execute
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242 *
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243 * @exception ProcessException
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244 * if the program cannot be executed
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245 */
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246 public static void exec(char[] prog) {
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247 auto proc = new Process( prog );
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248 proc.execute;
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249 }
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250
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251 /**
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252 * Execute progArray[0] in a separate platform process if the
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253 * underlying platform support this.
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254 * <p>
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255 * The new process inherits the environment of the caller.
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256 * <p>
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257 *
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258 * @param progArray array containing the program to execute and its arguments
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259 *
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260 * @exception ProcessException
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261 * if the program cannot be executed
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262 */
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263 public static void exec(char[][] progArray) {
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264 auto proc = new Process( progArray );
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265 proc.execute;
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266 }
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267 /++ PORTING_LEFT
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268 private static ResourceBundle msgs = null;
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269
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270 /**
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271 * Returns the NLS'ed message for the given argument. This is only being
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272 * called from DWT.
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273 *
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274 * @param key the key to look up
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275 * @return the message for the given key
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276 *
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277 * @see DWT#getMessage(String)
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278 */
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279 public static String getMessage(String key) {
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280 String answer = key;
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281
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282 if (key == null) {
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283 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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284 }
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285 if (msgs == null) {
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286 try {
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287 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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288 } catch (MissingResourceException ex) {
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289 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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290 }
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291 }
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292 if (msgs != null) {
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293 try {
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294 answer = msgs.getString(key);
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295 } catch (MissingResourceException ex2) {}
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296 }
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297 return answer;
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298 }
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299
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300 public static String getMessage(String key, Object[] args) {
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301 String answer = key;
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302
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303 if (key == null || args == null) {
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304 DWT.error (DWT.ERROR_NULL_ARGUMENT);
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305 }
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306 if (msgs == null) {
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307 try {
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308 msgs = ResourceBundle.getBundle("dwt.internal.SWTMessages"); //$NON-NLS-1$
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309 } catch (MissingResourceException ex) {
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310 answer = key + " (no resource bundle)"; //$NON-NLS-1$
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311 }
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312 }
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313 if (msgs != null) {
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314 try {
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315 MessageFormat formatter = new MessageFormat("");
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316 formatter.applyPattern(msgs.getString(key));
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317 answer = formatter.format(args);
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318 } catch (MissingResourceException ex2) {}
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319 }
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320 return answer;
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321 }
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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 * Interrupt the current thread.
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327 * <p>
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328 * Note that this is not available on CLDC.
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329 * </p>
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330 */
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331 public static void interrupt() {
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332 //PORTING_FIXME: how to implement??
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333 //Thread.currentThread().interrupt();
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334 }
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335
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336 /**
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337 * Compares two instances of class String ignoring the case of the
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338 * characters and answers if they are equal.
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339 *
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340 * @param s1 string
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341 * @param s2 string
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342 * @return true if the two instances of class String are equal
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343 */
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344 public static bool equalsIgnoreCase(char[] s1, char[] s2) {
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345 char[] s1b = new char[ s1.length ];
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346 char[] s2b = new char[ s1.length ];
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347 scope(exit){
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348 delete s1b;
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349 delete s2b;
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350 }
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351 char[] s1c = Unicode.toFold( s1, s1b );
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352 char[] s2c = Unicode.toFold( s2, s2b );
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353 return s1c == s2c;
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354 }
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355
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356 }