/*
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* Copyright (c) 2018-2028, DreamLu All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: DreamLu 卢春梦 (596392912@qq.com)
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*/
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package org.springblade.core.tool.utils;
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import org.springframework.lang.Nullable;
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/**
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* 数字类型工具类
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*
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* @author L.cm
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*/
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public class NumberUtil extends org.springframework.util.NumberUtils {
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//-----------------------------------------------------------------------
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/**
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* <p>Convert a <code>String</code> to an <code>int</code>, returning
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* <code>zero</code> if the conversion fails.</p>
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*
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* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
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*
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* <pre>
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* NumberUtil.toInt(null) = 0
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* NumberUtil.toInt("") = 0
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* NumberUtil.toInt("1") = 1
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* </pre>
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*
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* @param str the string to convert, may be null
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* @return the int represented by the string, or <code>zero</code> if
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* conversion fails
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*/
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public static int toInt(final String str) {
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return toInt(str, -1);
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}
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/**
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* <p>Convert a <code>String</code> to an <code>int</code>, returning a
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* default value if the conversion fails.</p>
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*
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* <p>If the string is <code>null</code>, the default value is returned.</p>
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*
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* <pre>
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* NumberUtil.toInt(null, 1) = 1
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* NumberUtil.toInt("", 1) = 1
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* NumberUtil.toInt("1", 0) = 1
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* </pre>
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*
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* @param str the string to convert, may be null
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* @param defaultValue the default value
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* @return the int represented by the string, or the default if conversion fails
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*/
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public static int toInt(@Nullable final String str, final int defaultValue) {
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if (str == null) {
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return defaultValue;
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}
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try {
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return Integer.valueOf(str);
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} catch (final NumberFormatException nfe) {
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return defaultValue;
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}
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}
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/**
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* <p>Convert a <code>String</code> to a <code>long</code>, returning
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* <code>zero</code> if the conversion fails.</p>
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*
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* <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
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*
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* <pre>
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* NumberUtil.toLong(null) = 0L
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* NumberUtil.toLong("") = 0L
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* NumberUtil.toLong("1") = 1L
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* </pre>
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*
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* @param str the string to convert, may be null
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* @return the long represented by the string, or <code>0</code> if
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* conversion fails
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*/
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public static long toLong(final String str) {
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return toLong(str, 0L);
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}
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/**
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* <p>Convert a <code>String</code> to a <code>long</code>, returning a
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* default value if the conversion fails.</p>
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*
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* <p>If the string is <code>null</code>, the default value is returned.</p>
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*
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* <pre>
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* NumberUtil.toLong(null, 1L) = 1L
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* NumberUtil.toLong("", 1L) = 1L
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* NumberUtil.toLong("1", 0L) = 1L
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* </pre>
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*
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* @param str the string to convert, may be null
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* @param defaultValue the default value
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* @return the long represented by the string, or the default if conversion fails
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*/
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public static long toLong(@Nullable final String str, final long defaultValue) {
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if (str == null) {
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return defaultValue;
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}
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try {
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return Long.valueOf(str);
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} catch (final NumberFormatException nfe) {
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return defaultValue;
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}
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}
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/**
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* <p>Convert a <code>String</code> to a <code>Double</code>
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*
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* @param value value
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* @return double value
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*/
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public static Double toDouble(String value) {
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return toDouble(value, null);
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}
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/**
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* <p>Convert a <code>String</code> to a <code>Double</code>
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*
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* @param value value
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* @param defaultValue 默认值
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* @return double value
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*/
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public static Double toDouble(@Nullable String value, Double defaultValue) {
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if (value != null) {
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return Double.valueOf(value.trim());
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}
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return defaultValue;
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}
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/**
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* <p>Convert a <code>String</code> to a <code>Double</code>
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*
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* @param value value
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* @return double value
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*/
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public static Float toFloat(String value) {
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return toFloat(value, null);
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}
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/**
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* <p>Convert a <code>String</code> to a <code>Double</code>
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*
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* @param value value
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* @param defaultValue 默认值
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* @return double value
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*/
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public static Float toFloat(@Nullable String value, Float defaultValue) {
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if (value != null) {
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return Float.valueOf(value.trim());
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}
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return defaultValue;
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}
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/**
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* All possible chars for representing a number as a String
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*/
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private final static char[] DIGITS = {
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'0', '1', '2', '3', '4', '5',
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'6', '7', '8', '9', 'a', 'b',
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'c', 'd', 'e', 'f', 'g', 'h',
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'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z',
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'A', 'B', 'C', 'D', 'E', 'F',
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'G', 'H', 'I', 'J', 'K', 'L',
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'M', 'N', 'O', 'P', 'Q', 'R',
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'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z'
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};
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/**
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* 将 long 转短字符串 为 62 进制
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*
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* @param i 数字
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* @return 短字符串
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*/
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public static String to62String(long i) {
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int radix = DIGITS.length;
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char[] buf = new char[65];
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int charPos = 64;
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i = -i;
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while (i <= -radix) {
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buf[charPos--] = DIGITS[(int) (-(i % radix))];
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i = i / radix;
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}
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buf[charPos] = DIGITS[(int) (-i)];
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return new String(buf, charPos, (65 - charPos));
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}
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}
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