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AJAXJS aims to full-stack, not only the server-side framework,
but also integrates the front-end library. It's written in HTML5 + Java, a successor to the JVM platform, efficient, secure, stable, cross-platform and many other advantages, but it abandoned the traditional enterprise architecture brought about by the large and bloated,
emphasizing the lightweight, and fast, very suitable for the Internet fast application.
/**
* Copyright Sp42 [email protected]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ajaxjs.util;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.function.Function;
/**
* 处理值的一些相关函数
*
* @author Sp42 [email protected]
*/
public class MappingValue {
/**
* 把字符串还原为 Java 里面的真实值，如 "true"--true,"123"--123,"null"--null
*
* @param value 字符串的值
* @return Java 里面的值
*/
public static Object toJavaValue(String value) {
if (value == null)
return null;
value = value.trim();
if ("".equals(value))
return "";
if ("null".equals(value))
return null;
if ("true".equalsIgnoreCase(value))
return true;
if ("false".equalsIgnoreCase(value))
return false;
// try 比较耗资源，先检查一下
if (value.charAt(0) == '-' || (value.charAt(0) >= '0' && value.charAt(0) <= '9'))
try {
int int_value = Integer.parseInt(value);
if ((int_value + "").equals(value)) // 判断为整形
return int_value;
} catch (NumberFormatException e) {// 不能转换为数字
try {
long long_value = Long.parseLong(value);
if ((long_value + "").equals(value)) // 判断为整形
return long_value;
} catch (NumberFormatException e1) {
if (value.matches("[0-9]{1,13}(\\.[0-9]*)?")) {
return Double.parseDouble(value);
}
}
}
return value;
}
/**
* true/1、 字符串 true／1/yes/on 被视为 true 返回； false／0/null、字符串 false／0/no/off/null
* 被视为 false 返回；
*
* @param value 输入值
* @return true/false
*/
public static boolean toBoolean(Object value) {
if (value == null)
return false;
if (value.equals(true) || value.equals(1))
return true;
if (value instanceof String) {
String _value = (String) value;
if (_value.equalsIgnoreCase("yes") || _value.equalsIgnoreCase("true") || _value.equals("1") || _value.equalsIgnoreCase("on"))
return true;
if (_value.equalsIgnoreCase("no") || _value.equalsIgnoreCase("false") || _value.equals("0") || _value.equalsIgnoreCase("off") || _value.equalsIgnoreCase("null"))
return false;
}
return false;
}
/**
* 根据送入的类型作适当转换
*
* @param value 送入的值
* @param t 期待的类型
* @return 已经转换类型的值
*/
@SuppressWarnings("unchecked")
public static Object objectCast(Object value, Class t) {
if (value == null)
return null;
else if (t == boolean.class || t == Boolean.class) {// 布尔型
value = toBoolean(value);
} else if (t == int.class || t == Integer.class) { // 整形
value = Integer.parseInt(value.toString());
} else if (t == int[].class || t == Integer[].class) {
// 复数
if (value instanceof String) {
value = stringArr2intArr((String) value, diver + "");
} else if (value instanceof List) {
value = integerList2arr((List) value);
}
} else if (t == long.class || t == Long.class) {
// LONG 型
value = Long.valueOf((value == null || CommonUtil.isEmptyString(value.toString())) ? "0" : value.toString());
} else if (t == String.class) { // 字符串型
value = value.toString();
} else if (t == String[].class) {
// 复数
if (value instanceof ArrayList) {
ArrayList list = (ArrayList) value;
value = list.toArray(new String[list.size()]);
} else if (value instanceof String) {
String str = (String) value;
value = str.split(diver + "");
} else {
// LOGGER.info("Bean 要求 String[] 类型，但实际传入类型：" +
// value.getClass().getName());
}
} else if (t == Date.class) {
value = CommonUtil.Objet2Date(value);
} else if (t == BigDecimal.class) {
if (value instanceof Integer) {
value = new BigDecimal((Integer) value);
} else if (value instanceof String) {
BigDecimal b = new BigDecimal((String) value);
b.setScale(2, BigDecimal.ROUND_DOWN);
value = b;
}
}
return value;
}
/**
* 用于数组的分隔符
*/
static char diver = ',';
/**
* Integer[] 不能直接转 int[]
*
* @param list 整形列表
* @return 整形数组
*/
private static int[] integerList2arr(List list) {
return newIntArray(list.size(), index -> list.get(index));
}
/**
* 当它们每一个都是数字的字符串形式，转换为整形的数组 "1,2,3, ..." -- [1, 2, ...]
*
* @param value 输入字符串
* @param diver 分隔符
* @return 整形数组
*/
private static int[] stringArr2intArr(String value, String diver) {
String[] strArr = value.split(diver);
return newIntArray(strArr.length, index -> Integer.parseInt(strArr[index].trim()));
}
/**
*
* @param length
* @param fn
* @return
*/
private static int[] newIntArray(int length, Function fn) {
int[] arr = new int[length];
for (int i = 0; i < length; i++)
arr[i] = fn.apply(i);
return arr;
}
}