Android Open Source - Common-Library G B2 Alpha

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License

The source code is released under:

Apache License

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Java Source Code

package com.morgan.library.utils;
/* w  w  w  .  j a  v  a  2  s  . c  om*/
import java.util.Locale;

/**
 * ????????????????????
 * 
 * @author Morgan.Ji
 * 
 */
public class GB2Alpha {

  // ???Z???????????????
  // i, u, v?????????, ????????????
  private static char[] chartable = { '?', '?', '?', '???', '?', '???', '?', '?',
      '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
      '?', '?', '?', '?', '??', '?' };
  private static char[] alphatableb = { 'A', 'B', 'C', 'D', 'E', 'F', 'G',
      'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
      'U', 'V', 'W', 'X', 'Y', 'Z' };
  private static char[] alphatables = { 'a', 'b', 'c', 'd', 'e', 'f', 'g',
      'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
      'u', 'v', 'w', 'x', 'y', 'z' };
  private static int[] table = new int[27]; // ????
  {
    for (int i = 0; i < 27; ++i) {
      table[i] = gbValue(chartable[i]);
    }
  }

  // ???,????,???????,
  // ?????????????????
  // ??????????? '0' ?????
  public static char Char2Alpha(char ch, String type) {
    if (ch >= 'a' && ch <= 'z')
      // return (char) (ch - 'a' + 'A');
      return ch;
    if (ch >= 'A' && ch <= 'Z')
      return ch;

    int gb = gbValue(ch);
    if (gb < table[0])
      return '0';

    int i;
    for (i = 0; i < 26; ++i) {
      if (match(i, gb))
        break;
    }

    if (i >= 26) {
      return '0';
    } else {
      if ("b".equals(type)) {// ??
        return alphatableb[i];
      } else {// ???
        return alphatables[i];
      }
    }
  }

  // ????????????????????????????????
  public static String String2Alpha(String SourceStr, String type) {
    String Result = "";
    int StrLength = SourceStr.length();
    int i;
    try {
      for (i = 0; i < StrLength; i++) {
        Result += Char2Alpha(SourceStr.charAt(i), type);
      }
    } catch (Exception e) {
      Result = "";
    }
    return Result;
  }

  // ?????????????????????????????????
  public static String string2AlphaFirst(String SourceStr, String type) {
    String Result = "";
    try {
      Result += Char2Alpha(SourceStr.charAt(0), type);
    } catch (Exception e) {
      Result = "";
    }
    return Result;
  }

  // ?????????????????????????????????
  public static String string2AlphaFirst(String SourceStr) {
    String Result = "";
    try {
      Result += Char2Alpha(SourceStr.charAt(0), "b");
    } catch (Exception e) {
      Result = "";
    }
    return Result;
  }

  private static boolean match(int i, int gb) {
    if (gb < table[i])
      return false;
    int j = i + 1;

    // ???Z???????
    while (j < 26 && (table[j] == table[i]))
      ++j;
    if (j == 26)
      return gb <= table[j];
    else
      return gb < table[j];
  }

  // ??????????
  private static int gbValue(char ch) {
    String str = new String();
    str += ch;
    try {
      byte[] bytes = str.getBytes("GBK");
      if (bytes.length < 2)
        return 0;
      return (bytes[0] << 8 & 0xff00) + (bytes[1] & 0xff);
    } catch (Exception e) {
      return 0;
    }
  }

  public static String getStringFirstChar(String value) {
    String result = string2AlphaFirst(value);
    if (StrUtils.isEmpty(result) || "0".equals(result)) {
      result = "#";
    }
    return result.toUpperCase(Locale.CHINESE);
  }
}

Java Source Code List