Enjoy 3.2 release ^_^
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/**
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* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.ext.extensionmethod;
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/**
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* 针对 java.lang.Integer 的扩展方法
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*
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* 重要用途:
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* Controller.keepPara() 方法会将所有类型的数据当成 String 并传回到
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* 到模板中,所以模板中的如下代码将无法工作:
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* #if(age > 18)
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* ....
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* #end
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*
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* 以上代码,第一次渲染模板时,由于 age 为 int 类型,那么 if 语句中是正确的表达式,
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* 当提交表单后在后端调用 keepPara() 以后 age 变成了 String 类型,表达式错误,
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* 在有了扩展方法以后,解决办法如下:
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* #if(age.toInt() > 18)
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* ...
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* #end
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* 如上所示,无论 age 是 String 还是 int 型,调用其 toInt() 方法将一直确保
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* age 为 int 类型
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*
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* 以上用法,必须针对 String 与 Integer 同时扩展一个 toInt() 方法,模板表达式中的
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* 变量为 String 或为 Integer 时都存在 toInt() 方法可供调用
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*
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*
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* 用法:
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* #if(age.toInt() > 18)
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*/
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public class IntegerExt {
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public Boolean toBoolean(Integer self) {
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return self != 0;
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}
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public Integer toInt(Integer self) {
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return self;
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}
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public Long toLong(Integer self) {
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return self.longValue();
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}
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public Float toFloat(Integer self) {
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return self.floatValue();
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}
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public Double toDouble(Integer self) {
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return self.doubleValue();
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}
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}
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