zkoss/zk

/* Integers.java

    Purpose:
        
    Description:
        
    History:
        Tue Feb 24 21:25:22     2004, Created by tomyeh

Copyright (C) 2004 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
    This program is distributed under LGPL Version 2.1 in the hope that
    it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.lang;

/**
 * Integer utilities.
 *
 * @author tomyeh
 */
public class Integers {
    /** The zero. */
    public static final Integer ZERO = Objects.ZERO_INTEGER;

    /** urns a String object representing the specified integer, with
     * the (at-least) specified digits.
     *
     * <p>Example: toStringByScale(123, 5) returns "00123",
     * toStringByScale(123, 2) returns "123".
     */
    public static final String toStringByScale(int val, int digits) {
        String sval = Integer.toString(val);
        int df = digits - sval.length();
        if (df <= 0)
            return sval;

        final StringBuffer sb = new StringBuffer(digits);
        while (--df >= 0) sb.append('0');
        return sb.append(sval).toString();
    }
}