/*
 * Created on 2005-5-13
 * 利用正則表達(dá)式對(duì)數(shù)字進(jìn)行判斷
 * 代碼來源自PIGO，有改動(dòng)
 */
package org.waityou.utils;

import java.util.regex.*;

/**
 * @author Ace
 *     thanks, pigo
 *
 */
public class ValidationNumber {

    private static Pattern intnumPattern;

    private static Pattern numberPattern;

    private static Pattern doublenumPattern;

    public static boolean isintNumber(String aString) {
        //      檢查一個(gè)字符串是否是整數(shù) 允許一個(gè)正負(fù)符號(hào)位

        if (aString == null || aString.length() < 1) {
            return false;
        }

        if (intnumPattern == null) {
            intnumPattern = Pattern.compile("^[+-]?[\\d]+$");
        }

        return intnumPattern.matcher(aString).find();
    }

    public static boolean isNumber(String aString) {
        //      檢查一個(gè)字符串是否全部是數(shù)字

        if (aString == null || aString.length() < 1) {
            return false;
        }

        if (numberPattern == null) {
            numberPattern = Pattern.compile("^[\\d]+$");     //  "^[+-]?([\\d]+)|([\\d]+\\.[\\d]+)$"
        }

        return numberPattern.matcher(aString).find();
    }

    public static boolean isdoubleNumber(String aString) {
        //檢查一個(gè)字符串是否是浮點(diǎn)小數(shù),浮點(diǎn)小數(shù)至少一個(gè)數(shù)字開頭,允許一個(gè)正負(fù)符號(hào)位
        //中間只出現(xiàn)一個(gè)小數(shù)點(diǎn),小數(shù)點(diǎn)之后至少一個(gè)數(shù)字

        if (aString == null || aString.length() < 1) {
            return false;
        }

        if (doublenumPattern == null) {
            doublenumPattern = Pattern.compile("^[+-]?[\\d]+\\.[\\d]+$");
        }
        return doublenumPattern.matcher(aString).find();
    }

    public static void main(String[] args) {
        
        // 測(cè)試
        String intnum1 = "-23423";
        String intnum2 = "234";
        String numstring = "234sdf";
        String num1 = "234234";
        String doublenum1 = "0.123456";
        String doublenum2 = "-0.23";
        String doublenum3 = ".123123";

        System.out.println("" + isintNumber(intnum1));
        System.out.println("" + isintNumber(intnum2));
        System.out.println("" + isintNumber(numstring));

        System.out.println("" + isNumber(num1));
        System.out.println("" + isNumber(numstring));

        System.out.println("" + isdoubleNumber(doublenum1));
        System.out.println("" + isdoubleNumber(doublenum2));
        System.out.println("" + isdoubleNumber(doublenum3));
        System.out.println("" + isdoubleNumber(numstring));
    }
}