| 1 | /* |
| 2 | * Copyright 2001-2005 Stephen Colebourne |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.joda.time.format; |
| 17 | |
| 18 | import java.io.IOException; |
| 19 | import java.io.Writer; |
| 20 | |
| 21 | /** |
| 22 | * Utility methods used by formatters. |
| 23 | * <p> |
| 24 | * FormatUtils is thread-safe and immutable. |
| 25 | * |
| 26 | * @author Brian S O'Neill |
| 27 | * @since 1.0 |
| 28 | */ |
| 29 | public class FormatUtils { |
| 30 | |
| 31 | private static final double LOG_10 = Math.log(10); |
| 32 | |
| 33 | /** |
| 34 | * Restricted constructor. |
| 35 | */ |
| 36 | private FormatUtils() { |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Converts an integer to a string, prepended with a variable amount of '0' |
| 41 | * pad characters, and appends it to the given buffer. |
| 42 | * |
| 43 | * <p>This method is optimized for converting small values to strings. |
| 44 | * |
| 45 | * @param buf receives integer converted to a string |
| 46 | * @param value value to convert to a string |
| 47 | * @param size minumum amount of digits to append |
| 48 | */ |
| 49 | public static void appendPaddedInteger(StringBuffer buf, int value, int size) { |
| 50 | if (value < 0) { |
| 51 | buf.append('-'); |
| 52 | if (value != Integer.MIN_VALUE) { |
| 53 | value = -value; |
| 54 | } else { |
| 55 | for (; size > 10; size--) { |
| 56 | buf.append('0'); |
| 57 | } |
| 58 | buf.append("" + -(long)Integer.MIN_VALUE); |
| 59 | return; |
| 60 | } |
| 61 | } |
| 62 | if (value < 10) { |
| 63 | for (; size > 1; size--) { |
| 64 | buf.append('0'); |
| 65 | } |
| 66 | buf.append((char)(value + '0')); |
| 67 | } else if (value < 100) { |
| 68 | for (; size > 2; size--) { |
| 69 | buf.append('0'); |
| 70 | } |
| 71 | // Calculate value div/mod by 10 without using two expensive |
| 72 | // division operations. (2 ^ 27) / 10 = 13421772. Add one to |
| 73 | // value to correct rounding error. |
| 74 | int d = ((value + 1) * 13421772) >> 27; |
| 75 | buf.append((char) (d + '0')); |
| 76 | // Append remainder by calculating (value - d * 10). |
| 77 | buf.append((char) (value - (d << 3) - (d << 1) + '0')); |
| 78 | } else { |
| 79 | int digits; |
| 80 | if (value < 1000) { |
| 81 | digits = 3; |
| 82 | } else if (value < 10000) { |
| 83 | digits = 4; |
| 84 | } else { |
| 85 | digits = (int)(Math.log(value) / LOG_10) + 1; |
| 86 | } |
| 87 | for (; size > digits; size--) { |
| 88 | buf.append('0'); |
| 89 | } |
| 90 | buf.append(Integer.toString(value)); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Converts an integer to a string, prepended with a variable amount of '0' |
| 96 | * pad characters, and appends it to the given buffer. |
| 97 | * |
| 98 | * <p>This method is optimized for converting small values to strings. |
| 99 | * |
| 100 | * @param buf receives integer converted to a string |
| 101 | * @param value value to convert to a string |
| 102 | * @param size minumum amount of digits to append |
| 103 | */ |
| 104 | public static void appendPaddedInteger(StringBuffer buf, long value, int size) { |
| 105 | int intValue = (int)value; |
| 106 | if (intValue == value) { |
| 107 | appendPaddedInteger(buf, intValue, size); |
| 108 | } else if (size <= 19) { |
| 109 | buf.append(Long.toString(value)); |
| 110 | } else { |
| 111 | if (value < 0) { |
| 112 | buf.append('-'); |
| 113 | if (value != Long.MIN_VALUE) { |
| 114 | value = -value; |
| 115 | } else { |
| 116 | for (; size > 19; size--) { |
| 117 | buf.append('0'); |
| 118 | } |
| 119 | buf.append("9223372036854775808"); |
| 120 | return; |
| 121 | } |
| 122 | } |
| 123 | int digits = (int)(Math.log(value) / LOG_10) + 1; |
| 124 | for (; size > digits; size--) { |
| 125 | buf.append('0'); |
| 126 | } |
| 127 | buf.append(Long.toString(value)); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Converts an integer to a string, prepended with a variable amount of '0' |
| 133 | * pad characters, and writes it to the given writer. |
| 134 | * |
| 135 | * <p>This method is optimized for converting small values to strings. |
| 136 | * |
| 137 | * @param out receives integer converted to a string |
| 138 | * @param value value to convert to a string |
| 139 | * @param size minumum amount of digits to append |
| 140 | */ |
| 141 | public static void writePaddedInteger(Writer out, int value, int size) |
| 142 | throws IOException |
| 143 | { |
| 144 | if (value < 0) { |
| 145 | out.write('-'); |
| 146 | if (value != Integer.MIN_VALUE) { |
| 147 | value = -value; |
| 148 | } else { |
| 149 | for (; size > 10; size--) { |
| 150 | out.write('0'); |
| 151 | } |
| 152 | out.write("" + -(long)Integer.MIN_VALUE); |
| 153 | return; |
| 154 | } |
| 155 | } |
| 156 | if (value < 10) { |
| 157 | for (; size > 1; size--) { |
| 158 | out.write('0'); |
| 159 | } |
| 160 | out.write(value + '0'); |
| 161 | } else if (value < 100) { |
| 162 | for (; size > 2; size--) { |
| 163 | out.write('0'); |
| 164 | } |
| 165 | // Calculate value div/mod by 10 without using two expensive |
| 166 | // division operations. (2 ^ 27) / 10 = 13421772. Add one to |
| 167 | // value to correct rounding error. |
| 168 | int d = ((value + 1) * 13421772) >> 27; |
| 169 | out.write(d + '0'); |
| 170 | // Append remainder by calculating (value - d * 10). |
| 171 | out.write(value - (d << 3) - (d << 1) + '0'); |
| 172 | } else { |
| 173 | int digits; |
| 174 | if (value < 1000) { |
| 175 | digits = 3; |
| 176 | } else if (value < 10000) { |
| 177 | digits = 4; |
| 178 | } else { |
| 179 | digits = (int)(Math.log(value) / LOG_10) + 1; |
| 180 | } |
| 181 | for (; size > digits; size--) { |
| 182 | out.write('0'); |
| 183 | } |
| 184 | out.write(Integer.toString(value)); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Converts an integer to a string, prepended with a variable amount of '0' |
| 190 | * pad characters, and writes it to the given writer. |
| 191 | * |
| 192 | * <p>This method is optimized for converting small values to strings. |
| 193 | * |
| 194 | * @param out receives integer converted to a string |
| 195 | * @param value value to convert to a string |
| 196 | * @param size minumum amount of digits to append |
| 197 | */ |
| 198 | public static void writePaddedInteger(Writer out, long value, int size) |
| 199 | throws IOException |
| 200 | { |
| 201 | int intValue = (int)value; |
| 202 | if (intValue == value) { |
| 203 | writePaddedInteger(out, intValue, size); |
| 204 | } else if (size <= 19) { |
| 205 | out.write(Long.toString(value)); |
| 206 | } else { |
| 207 | if (value < 0) { |
| 208 | out.write('-'); |
| 209 | if (value != Long.MIN_VALUE) { |
| 210 | value = -value; |
| 211 | } else { |
| 212 | for (; size > 19; size--) { |
| 213 | out.write('0'); |
| 214 | } |
| 215 | out.write("9223372036854775808"); |
| 216 | return; |
| 217 | } |
| 218 | } |
| 219 | int digits = (int)(Math.log(value) / LOG_10) + 1; |
| 220 | for (; size > digits; size--) { |
| 221 | out.write('0'); |
| 222 | } |
| 223 | out.write(Long.toString(value)); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Converts an integer to a string, and appends it to the given buffer. |
| 229 | * |
| 230 | * <p>This method is optimized for converting small values to strings. |
| 231 | * |
| 232 | * @param buf receives integer converted to a string |
| 233 | * @param value value to convert to a string |
| 234 | */ |
| 235 | public static void appendUnpaddedInteger(StringBuffer buf, int value) { |
| 236 | if (value < 0) { |
| 237 | buf.append('-'); |
| 238 | if (value != Integer.MIN_VALUE) { |
| 239 | value = -value; |
| 240 | } else { |
| 241 | buf.append("" + -(long)Integer.MIN_VALUE); |
| 242 | return; |
| 243 | } |
| 244 | } |
| 245 | if (value < 10) { |
| 246 | buf.append((char)(value + '0')); |
| 247 | } else if (value < 100) { |
| 248 | // Calculate value div/mod by 10 without using two expensive |
| 249 | // division operations. (2 ^ 27) / 10 = 13421772. Add one to |
| 250 | // value to correct rounding error. |
| 251 | int d = ((value + 1) * 13421772) >> 27; |
| 252 | buf.append((char) (d + '0')); |
| 253 | // Append remainder by calculating (value - d * 10). |
| 254 | buf.append((char) (value - (d << 3) - (d << 1) + '0')); |
| 255 | } else { |
| 256 | buf.append(Integer.toString(value)); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Converts an integer to a string, and appends it to the given buffer. |
| 262 | * |
| 263 | * <p>This method is optimized for converting small values to strings. |
| 264 | * |
| 265 | * @param buf receives integer converted to a string |
| 266 | * @param value value to convert to a string |
| 267 | */ |
| 268 | public static void appendUnpaddedInteger(StringBuffer buf, long value) { |
| 269 | int intValue = (int)value; |
| 270 | if (intValue == value) { |
| 271 | appendUnpaddedInteger(buf, intValue); |
| 272 | } else { |
| 273 | buf.append(Long.toString(value)); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Converts an integer to a string, and writes it to the given writer. |
| 279 | * |
| 280 | * <p>This method is optimized for converting small values to strings. |
| 281 | * |
| 282 | * @param out receives integer converted to a string |
| 283 | * @param value value to convert to a string |
| 284 | */ |
| 285 | public static void writeUnpaddedInteger(Writer out, int value) |
| 286 | throws IOException |
| 287 | { |
| 288 | if (value < 0) { |
| 289 | out.write('-'); |
| 290 | if (value != Integer.MIN_VALUE) { |
| 291 | value = -value; |
| 292 | } else { |
| 293 | out.write("" + -(long)Integer.MIN_VALUE); |
| 294 | return; |
| 295 | } |
| 296 | } |
| 297 | if (value < 10) { |
| 298 | out.write(value + '0'); |
| 299 | } else if (value < 100) { |
| 300 | // Calculate value div/mod by 10 without using two expensive |
| 301 | // division operations. (2 ^ 27) / 10 = 13421772. Add one to |
| 302 | // value to correct rounding error. |
| 303 | int d = ((value + 1) * 13421772) >> 27; |
| 304 | out.write(d + '0'); |
| 305 | // Append remainder by calculating (value - d * 10). |
| 306 | out.write(value - (d << 3) - (d << 1) + '0'); |
| 307 | } else { |
| 308 | out.write(Integer.toString(value)); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * Converts an integer to a string, and writes it to the given writer. |
| 314 | * |
| 315 | * <p>This method is optimized for converting small values to strings. |
| 316 | * |
| 317 | * @param out receives integer converted to a string |
| 318 | * @param value value to convert to a string |
| 319 | */ |
| 320 | public static void writeUnpaddedInteger(Writer out, long value) |
| 321 | throws IOException |
| 322 | { |
| 323 | int intValue = (int)value; |
| 324 | if (intValue == value) { |
| 325 | writeUnpaddedInteger(out, intValue); |
| 326 | } else { |
| 327 | out.write(Long.toString(value)); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Calculates the number of decimal digits for the given value, |
| 333 | * including the sign. |
| 334 | */ |
| 335 | public static int calculateDigitCount(long value) { |
| 336 | if (value < 0) { |
| 337 | if (value != Long.MIN_VALUE) { |
| 338 | return calculateDigitCount(-value) + 1; |
| 339 | } else { |
| 340 | return 20; |
| 341 | } |
| 342 | } |
| 343 | return |
| 344 | (value < 10 ? 1 : |
| 345 | (value < 100 ? 2 : |
| 346 | (value < 1000 ? 3 : |
| 347 | (value < 10000 ? 4 : |
| 348 | ((int)(Math.log(value) / LOG_10) + 1))))); |
| 349 | } |
| 350 | |
| 351 | static int parseTwoDigits(String text, int position) { |
| 352 | int value = text.charAt(position) - '0'; |
| 353 | return ((value << 3) + (value << 1)) + text.charAt(position + 1) - '0'; |
| 354 | } |
| 355 | |
| 356 | static String createErrorMessage(final String text, final int errorPos) { |
| 357 | int sampleLen = errorPos + 32; |
| 358 | String sampleText; |
| 359 | if (text.length() <= sampleLen + 3) { |
| 360 | sampleText = text; |
| 361 | } else { |
| 362 | sampleText = text.substring(0, sampleLen).concat("..."); |
| 363 | } |
| 364 | |
| 365 | if (errorPos <= 0) { |
| 366 | return "Invalid format: \"" + sampleText + '"'; |
| 367 | } |
| 368 | |
| 369 | if (errorPos >= text.length()) { |
| 370 | return "Invalid format: \"" + sampleText + "\" is too short"; |
| 371 | } |
| 372 | |
| 373 | return "Invalid format: \"" + sampleText + "\" is malformed at \"" + |
| 374 | sampleText.substring(errorPos) + '"'; |
| 375 | } |
| 376 | |
| 377 | } |