VerifyUtils.java

package com.firefly.utils;

abstract public class VerifyUtils {

	public static boolean isNumeric(String str) {
		if (isEmpty(str))
			return false;
		
		char first = str.charAt(0);
		int i = first == '-' ? 1 : 0;
		for (; i < str.length(); i++) {
			if (isDigit(str.charAt(i)) == false) {
				return false;
			}
		}
		return true;
	}
	
	public static boolean isInteger(String str) {
		if (isEmpty(str))
			return false;
		
		char first = str.charAt(0);
		int i = first == '-' ? 1 : 0;
		for (; i < str.length(); i++) {
			if (isDigit(str.charAt(i)) == false) {
				return false;
			}
		}
		
		Long t = Long.parseLong(str);
		return t <= Integer.MAX_VALUE && t >= Integer.MIN_VALUE;
	}
	
	public static boolean isLong(String str) {
		if (isEmpty(str))
			return false;
		
		char first = str.charAt(0);
		char end = str.charAt(str.length() - 1);
		boolean j = end == 'l' || end == 'L';
		int i = first == '-' ? 1 : 0;
		int len = j ? str.length() - 1 : str.length();
		for (; i < len; i++) {
			if (isDigit(str.charAt(i)) == false) {
				return false;
			}
		}
		
		if(!j) {
			Long t = Long.parseLong(str);
			return t > Integer.MAX_VALUE || t < Integer.MIN_VALUE;
		} else {
			return true;
		}
	}
	
	public static boolean isFloat(String str) {
		if (isEmpty(str))
			return false;
		
		char end = str.charAt(str.length() - 1);
		if(!(end == 'f' || end == 'F' ))
			return false;
		
		int point = 0;
		int i = str.charAt(0) == '-' ? 1 : 0;
		for (; i < str.length() - 1; i++) {
			char c = str.charAt(i);
			if(c == '.') {
				point++;
			} else if (VerifyUtils.isDigit(c) == false) {
				return false;
			}
		}
		return point == 1 || point == 0;
	}
	
	public static boolean isDouble(String str) {
		if (isEmpty(str))
			return false;

		int point = 0;
		int i = str.charAt(0) == '-' ? 1 : 0;
		for (; i < str.length(); i++) {
			char c = str.charAt(i);
			if(c == '.') {
				point++;
			} else if (isDigit(c) == false) {
				return false;
			}
		}
		
		return point == 1;
	}

	public static boolean isDigit(char ch) {
		return ch >= '0' && ch <= '9';
	}

	public static boolean isNotEmpty(Long o) {
		return o != null && StringUtils.hasText(o.toString());
	}

	public static boolean isNotEmpty(Integer o) {
		return o != null && StringUtils.hasText(o.toString());
	}

	public static boolean isNotEmpty(String o) {
		return StringUtils.hasText(o);
	}

	public static boolean isEmpty(Long o) {
		return !isNotEmpty(o);
	}

	public static boolean isEmpty(Integer o) {
		return !isNotEmpty(o);
	}

	public static boolean isEmpty(String o) {
		return !isNotEmpty(o);
	}
}