package com.hundsun.ares.studio.ui.editor.text;

import java.io.UnsupportedEncodingException;

/**
* ȡ�ø������ִ�������ĸ��,����ĸ��
* <p>Title: ChineseCharToEn</p>
* <p>@author javer QQ:84831612</p>
* @version 1.0
* @date 2004-02-19
* ע��ֻ֧��GB2312�ַ����еĺ���
*/
public final class ChineseCharToEn
{
    private final static int[] li_SecPosValue =
    {
        1601, 1637, 1833, 2078, 2274, 2302, 2433, 2594, 2787, 3106, 3212, 3472,
        3635, 3722, 3730, 3858, 4027, 4086, 4390, 4558, 4684, 4925, 5249, 5590
    };
    private final static String[] lc_FirstLetter =
    {
        "a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "l", "m", "n", "o", "p",
        "q", "r", "s", "t", "w", "x", "y", "z"
    };
   
    /**
    * ȡ�ø������ִ�������ĸ��,����ĸ��
    * @param str �������ִ�
    * @return ��ĸ��
    */
    public static String getAllFirstLetter(String str)
    {
        if (str == null || str.trim().length() == 0)
        {
            return "";
        }
       
        String _str = "";
        for (int i = 0; i < str.length(); i++)
        {
            _str = _str + getFirstLetter(str.substring(i, i + 1));
        }
       
        return _str;
    }
   
    /**
    * ȡ�ø������ֵ�����ĸ,����ĸ
    * @param chinese �������
    * @return �������ֵ���ĸ
    */
    public static String getFirstLetter(String chinese)
    {
        if (chinese == null || chinese.trim().length() == 0)
        {
            return "";
        }
        chinese = conversionStr(chinese, "GB2312", "ISO8859-1");
       
        if (chinese.length() > 1) //�ж��Dz��Ǻ���
        {
            int li_SectorCode = (int) chinese.charAt(0); //��������
            int li_PositionCode = (int) chinese.charAt(1); //�����
            li_SectorCode = li_SectorCode - 160;
            li_PositionCode = li_PositionCode - 160;
            int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; //�������
            if (li_SecPosCode > 1600 && li_SecPosCode < 5590)
            {
                for (int i = 0; i < 23; i++)
                {
                    if (li_SecPosCode >= li_SecPosValue[i] && li_SecPosCode < li_SecPosValue[i + 1])
                    {
                        chinese = lc_FirstLetter[i];
                        break;
                    }
                }
            }
            else //�Ǻ����ַ�,��ͼ�η��Ż�ASCII��
            {
                chinese = conversionStr(chinese, "ISO8859-1", "GB2312");
                chinese = chinese.substring(0,1);
            }
        }
       
        return chinese;
    }
   
    /**
    * �ַ�������ת��
    * @param str Ҫת��������ַ���
    * @param charsetName ԭ���ı���
    * @param toCharsetName ת����ı���
    * @return ��������ת������ַ���
    */
    private static String conversionStr(String str, String charsetName,String toCharsetName)
    {
        try
        {
            str = new String(str.getBytes(charsetName), toCharsetName);
        }
        catch (UnsupportedEncodingException ex)
        {
            System.out.println("�ַ�������ת���쳣��" + ex.getMessage());
        }
       
        return str;
    }
    
}