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package cn.jiguang.common.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.util.regex.Pattern;


public class StringUtils {
	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "A", "B", "C", "D", "E", "F" };

	private static Pattern pattern = Pattern.compile("^(1[34578][0-9])(\\d{4})(\\d{4})$");

	private static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n = 256 + n;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String toMD5(String origin) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return resultString;
	}
	
	public static String encodeParam(String param) {
		String encodeParam = null;
		try {
			encodeParam = URLEncoder.encode(param, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return encodeParam;
	}
	
    public static String arrayToString(String[] values) {
        if (null == values) return "";
        
        StringBuffer buffer = new StringBuffer(values.length);
        for (int i = 0; i < values.length; i++) {
            buffer.append(values[i]).append(",");
        }
        if (buffer.length() > 0) {
            return buffer.toString().substring(0, buffer.length() - 1);
        }
        return "";
    }
    
    public static boolean isEmpty(String s) {
        return s == null || s.length() == 0;
    }

    public static boolean isTrimedEmpty(String s) {
        return s == null || s.trim().length() == 0;
    }

    public static boolean isNotEmpty(String s) {
        return s != null && s.length() > 0;
    }

	public static boolean isLineBroken(String s) {
		if ( null == s ) {
			return false;
		}
		if  (s.contains("\n")) {
			return true;
		}
		if (s.contains("\r")) {
			return true;
		}
		return false;
	}

	public static boolean isMobileNumber(String s) {
		if (null == s) {
			return false;
		}
		if (pattern.matcher(s).matches()) {
			return true;
		}
		return false;
	}
	
	public static String notNull(String s){
		if(s == null){
			return "";
		}else {
			return s;
		}
	}

}