36.仿简道云公式函数实战-数学函数-ROUND

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1. ROUND函数

将数字四舍五入到指定的位数。

2. 函数用法

ROUND(number, num_digits)

number: 必需。要四舍五入的数字。

num_digits: 必需。要进行四舍五入运算的位数。

3. 函数示例

ROUND(88/3,2)，返回结果为 29.33

4. 代码实战

首先我们在function包下创建math包，在math包下创建RoundFunction类，代码如下：

package com.ql.util.express.self.combat.function.math;import com.ql.util.express.Operator;
import com.ql.util.express.self.combat.exception.FormulaException;import java.math.BigDecimal;
import java.math.RoundingMode;/*** 类描述: ROUND函数* @author admin* @version 1.0.0* @date 2023/11/24 9:44*/
public class RoundFunction extends Operator {public RoundFunction(String name) {this.name = name;}@Overridepublic Object executeInner(Object[] lists) throws Exception {// 边界判断if (lists.length <=0 || lists.length > 3) {throw new FormulaException("操作数异常");}// 获取参数BigDecimal number = new BigDecimal(lists[0].toString());// 小数点位数int scale = Integer.parseInt(lists[1].toString());BigDecimal roundedNumber = number.setScale(scale, RoundingMode.HALF_UP);if (roundedNumber.stripTrailingZeros().scale() <= 0) {roundedNumber = roundedNumber.setScale(0);}if (roundedNumber.stripTrailingZeros().scale() >=1 && scale>=roundedNumber.stripTrailingZeros().scale()) {roundedNumber = roundedNumber.stripTrailingZeros();}if (roundedNumber.stripTrailingZeros().scale() >=1 && scale<roundedNumber.stripTrailingZeros().scale()) {roundedNumber = roundedNumber.setScale(0);}return roundedNumber;}
}

把RoundFunction类注册到公式函数入口类中，代码如下：

package com.ql.util.express.self.combat.ext;import com.ql.util.express.ExpressRunner;
import com.ql.util.express.IExpressResourceLoader;
import com.ql.util.express.parse.NodeTypeManager;
import com.ql.util.express.self.combat.function.logic.*;
import com.ql.util.express.self.combat.function.math.*;/*** 类描述: 仿简道云公式函数实战入口类** @author admin* @version 1.0.0* @date 2023/11/21 15:29*/
public class FormulaRunner extends ExpressRunner {public FormulaRunner() {super();}public FormulaRunner(boolean isPrecise, boolean isTrace) {super(isPrecise,isTrace);}public FormulaRunner(boolean isPrecise, boolean isStrace, NodeTypeManager nodeTypeManager) {super(isPrecise,isStrace,nodeTypeManager);}public FormulaRunner(boolean isPrecise, boolean isTrace, IExpressResourceLoader iExpressResourceLoader, NodeTypeManager nodeTypeManager) {super(isPrecise,isTrace,iExpressResourceLoader,nodeTypeManager);}@Overridepublic void addSystemFunctions() {// ExpressRunner 的内部系统函数super.addSystemFunctions();// 扩展公式函数this.customFunction();}/**** 自定义公式函数*/public void customFunction() {// 逻辑公式函数this.addLogicFunction();// 数学公式函数this.addMathFunction();}public void addLogicFunction() {// AND函数this.addFunction("AND",new AndFunction("AND"));// IF函数this.addFunction("IF",new IfFunction("IF"));// IFS函数this.addFunction("IFS",new IfsFunction("IFS"));// XOR函数this.addFunction("XOR",new XorFunction("XOR"));// TRUE函数this.addFunction("TRUE",new TrueFunction("TRUE"));// FALSE函数this.addFunction("FALSE",new FalseFunction("FALSE"));// NOT函数this.addFunction("NOT",new NotFunction("NOT"));// OR函数this.addFunction("OR",new OrFunction("OR"));}public void addMathFunction() {// ABS函数this.addFunction("ABS",new AbsFunction("ABS"));// AVERAGE函数this.addFunction("AVERAGE",new AvgFunction("AVERAGE"));// CEILING函数this.addFunction("CEILING",new CeilingFunction("CEILING"));// RADIANS函数this.addFunction("RADIANS",new RadiansFunction("RADIANS"));// COS函数this.addFunction("COS",new CosFunction("COS"));// COT函数this.addFunction("COT",new CotFunction("COT"));// COUNT函数this.addFunction("COUNT",new CountFunction("COUNT"));// COUNTIF函数this.addFunction("COUNTIF",new CountIfFunction("COUNTIF"));// FIXED函数this.addFunction("FIXED",new FixedFunction("FIXED"));// FLOOR函数this.addFunction("FLOOR",new FloorFunction("FLOOR"));// INT函数this.addFunction("INT",new IntFunction("INT"));// LARGE函数this.addFunction("LARGE",new LargeFunction("LARGE"));// LOG函数this.addFunction("LOG",new LogFunction("LOG"));// MAX函数this.addFunction("MAX",new MaxFunction("MAX"));// MIN函数this.addFunction("MIN",new MinFunction("MIN"));// MOD函数this.addFunction("MOD",new ModFunction("MOD"));// POWER函数this.addFunction("POWER",new PowerFunction("POWER"));// PRODUCT函数this.addFunction("PRODUCT",new ProductFunction("PRODUCT"));// RAND函数this.addFunction("RAND",new RandFunction("RAND"));// ROUND函数this.addFunction("ROUND",new RoundFunction("ROUND"));}
}

创建测试用例

package com.ql.util.express.self.combat;import com.ql.util.express.DefaultContext;
import com.ql.util.express.self.combat.ext.FormulaRunner;
import org.junit.Test;/*** 类描述: 实战测试类** @author admin* @version 1.0.0* @date 2023/11/21 15:45*/
public class CombatTest {@Testpublic void ROUND() throws Exception{FormulaRunner formulaRunner = new FormulaRunner(true,true);// 创建上下文DefaultContext<String, Object> context = new DefaultContext<>();String express = "ROUND(总价/数量,2)";context.put("总价",88);context.put("数量",3);Object object = formulaRunner.execute(express, context, null, true, true);System.out.println(object);}}

运行结果