cnstring.java

CoolFace是基于jxta的P2P系统

package com.cn.darkblue.util;

final public class CNString {
	private String sStr_ = ""; //$NON-NLS-1$

	public CNString(String s) {
		sStr_ = s;
	}

	public String subStringB(int beginIndex, int length) {
		return subStringB(sStr_, beginIndex, length);
	}

	public String subStringB(int beginIndex) {
		return subStringB(sStr_, beginIndex);
	}

	public String leftB(int length) {
		return leftB(sStr_, length);
	}

	public String rightB(int length) {
		return rightB(sStr_, length);
	}

	public String rTrim() {
		return rTrim(sStr_);
	}

	public String lTrim() {
		return lTrim(sStr_);
	}

	public String trim() {
		return trim(sStr_);
	}

	public int lengthB() {
		return lengthB(sStr_);
	}

	/*
	 * subString() �� byte ��ȡ���ִ� ����: String s => ��Դ�ִ� int beginIndex => �_ʼλԪ�Mλ��
	 * int length => ��ȡλԪ�M�L�� ���: String
	 */
	public static String subStringB(String s, int beginIndex, int length) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; // ����ִ� //$NON-NLS-1$
		int _iByteOff = 0; // �� byte Ӌ������Mλ��
		int _iNumBytes = 0; // ȡ�� byte ��

		try {
			StringBuffer sb = new StringBuffer(length);

			for (int i = 0; i < s.length(); i++) {

				// �Д���Ԫ�Ƿ������
				if (Character.UnicodeBlock.of(s.charAt(i)) != Character.UnicodeBlock.BASIC_LATIN) {
					// ������Ԫ
					if (_iByteOff == (beginIndex - 1)) {
						// ��һbyte������������_ʼ, ԓ��Ԫ��ȡ, �� 1byte �հ�ȡ��
						sb.append(" "); //$NON-NLS-1$
						_iNumBytes++;
					} else if (_iByteOff >= beginIndex) {
						if (_iNumBytes + 2 > length) {
							// ���_��ȡ�L��, ����������ֵ�ǰ��, ԓ��Ԫ��ȡ, �� 1byte �հ�ȡ��
							sb.append(" "); //$NON-NLS-1$
							_iNumBytes++;
						} else {
							sb.append(s.charAt(i));
							_iNumBytes += 2;
						}
					}
					_iByteOff += 2; // ������Ԫ byte λ�����M 2
				} else {
					// ��������Ԫ
					if (_iByteOff >= beginIndex) {
						sb.append(s.charAt(i));
						_iNumBytes++;
					}
					_iByteOff++; // ��������Ԫ byte λ�����M 1
				}

				if (_iNumBytes >= length)
					break; // ���_��ȡ�L��, �Y��ޒȦ
			} // end for
			_sRet = sb.toString();
		} catch (Exception e) {

		} finally {
			return _sRet;
		} // end try

	} // end subStringB()

	public static String subStringB(String s, int beginIndex, int length,
			boolean isGetFirstWord) {
		if (isGetFirstWord) {
			return CNString.subStringB(s, beginIndex, length);
		} else {
			return CNString.subStringBE(s, beginIndex, length);
		}
	}

	public static String subStringBE(String s, int beginIndex, int length) {
		if (s == null) {
			return ""; //$NON-NLS-1$
		}
		if (beginIndex < 0 || length < 0 || (length - beginIndex) < 0) {
			return ""; //$NON-NLS-1$
		}
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; // ����ִ� //$NON-NLS-1$
		int _iByteOff = 0; // �� byte Ӌ������Mλ��
		int _iNumBytes = 0; // ȡ�� byte ��

		try {
			StringBuffer sb = new StringBuffer(length);

			for (int i = 0; i < s.length(); i++) {

				// �Д���Ԫ�Ƿ������
				if (Character.UnicodeBlock.of(s.charAt(i)) != Character.UnicodeBlock.BASIC_LATIN) {
					// ������Ԫ
					if (_iByteOff == (beginIndex - 1)) {
						// ��һbyte������������_ʼ, ԓ��Ԫ��ȡ, �� 1byte �հ�ȡ��
						sb.append(s.charAt(i));
						_iNumBytes += 2;
						// _iNumBytes++;
					} else if (_iByteOff >= beginIndex) {
						if (_iNumBytes + 2 > length) {
							// ���_��ȡ�L��, ����������ֵ�ǰ��, ԓ��Ԫ��ȡ, �� 1byte �հ�ȡ��
							sb.append(" "); //$NON-NLS-1$
							_iNumBytes++;
						} else {
							sb.append(s.charAt(i));
							_iNumBytes += 2;
						}
					}
					_iByteOff += 2; // ������Ԫ byte λ�����M 2
				} else {
					// ��������Ԫ
					if (_iByteOff >= beginIndex) {
						sb.append(s.charAt(i));
						_iNumBytes++;
					}
					_iByteOff++; // ��������Ԫ byte λ�����M 1
				}

				if (_iNumBytes >= length)
					break; // ���_��ȡ�L��, �Y��ޒȦ
			} // end for
			_sRet = sb.toString();
		} catch (Exception e) {

		} finally {
			return _sRet;
		} // end try
	}

	public static String subStringB(String s, int beginIndex) {
		return subStringB(s, beginIndex, (lengthB(s) - beginIndex));
	}

	public static String leftB(String s, int length) {
		return subStringB(s, 0, length);
	}

	public static String rightB(String s, int length) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		StringBuffer sb = new StringBuffer(s);
		String sTemp = subStringB(new String(sb.reverse()), 0, length);
		sb = new StringBuffer(sTemp);
		return new String(sb.reverse());
	}

	public static String replicate(char c, int length) {
		StringBuffer sb = new StringBuffer(length);
		for (int i = 0; i < length; i++)
			sb.append(c);

		return sb.toString();
	}

	public static String replicate(String s, int length) {
		return replicate(s.charAt(0), length);
	}

	public static String space(int length) {
		return replicate(' ', length);
	}

	public String lPadB(int length) {
		return lPadB(sStr_, length, ' ');
	}

	public static String lPadB(String s, int length) {
		return lPadB(s, length, ' ');
	}

	/**
	 * �Ԃ����L�ȁ�������Ԫ.
	 * 
	 * @param s
	 * @param length
	 * @param cPad;
	 *            Ҫ�������Ԫ, �A�O�ǿհ�
	 * @return ������֮�ִ�
	 */
	public static String lPadB(String s, int length, char cPad) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; //$NON-NLS-1$
		int _n = length - lengthB(s);

		if (_n <= 0) {
			_sRet = subStringB(s, 0, length);
		} else {
			_sRet = replicate(cPad, _n) + s;
		}
		return _sRet;
	}

	public String rPadB(int length) {
		return rPadB(sStr_, length, ' ');
	}

	public static String rPadB(String s, int length) {
		return rPadB(s, length, ' ');
	}

	/**
	 * �Ԃ����L�ȁ����ҷ���Ԫ.
	 * 
	 * @param s
	 * @param length
	 * @param cPad;
	 *            Ҫ�������Ԫ, �A�O�ǿհ�
	 * @return ������֮�ִ�
	 */
	public static String rPadB(String s, int length, char cPad) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; //$NON-NLS-1$
		int _n = length - lengthB(s);

		if (_n <= 0) {
			_sRet = subStringB(s, 0, length);
		} else {
			_sRet = s + replicate(cPad, _n);
		}
		return _sRet;
	}

	public String cPadB(int length) {
		return cPadB(sStr_, length);
	}

	public static String cPadB(String s, int length) {
		return cPadB(s, length, ' ');
	}

	/**
	 * �Ԃ����L�ȁ������g��Ԫ.
	 * 
	 * @param s
	 * @param length
	 * @param cPad;
	 *            Ҫ�������Ԫ, �A�O�ǿհ�
	 * @return ������֮�ִ�
	 */
	public static String cPadB(String s, int length, char cPad) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; //$NON-NLS-1$
		int _n = length - lengthB(s);

		if (_n <= 0) {
			_sRet = subStringB(s, 0, length);
		} else {
			int _mod = _n % 2;
			_n = (int) _n / 2;
			_sRet = replicate(cPad, _n) + s + replicate(cPad, _n)
					+ ((_mod == 1) ? " " : ""); //$NON-NLS-1$ //$NON-NLS-2$
		}
		return _sRet;
	}

	public static String lTrim(String s) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; //$NON-NLS-1$
		int _iCharOff = 0;

		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) != ' '
					&& s.charAt(i) != '\012' && s.charAt(i) != '\015'
					&& s.charAt(i) != '\011')
				break;
			_iCharOff++;
		}
		_sRet = s.substring(_iCharOff);
		return _sRet;
	}

	public static String rTrim(String s) {
		if (s == null)
			s = ""; //$NON-NLS-1$
		String _sRet = ""; //$NON-NLS-1$
		// String _sSpace = " ";
		int _iCharOff = s.length();

		for (int i = s.length() - 1; i >= 0; i--) {
			if (s.charAt(i) != ' ' && s.charAt(i) != '\012' && s.charAt(i) != '\015'
					&& s.charAt(i) != '\011')
				break;
			_iCharOff--;
		}
		_sRet = s.substring(0, _iCharOff);
		return _sRet;
	}

	public static String trim(String s) {
		return lTrim(rTrim(s));
	}

	public static int lengthB(String s) {
		return s.getBytes().length;
	}
}