17.仿简道云公式函数实战-数学函数-ABS-编程知识

17.仿简道云公式函数实战-数学函数-ABS

1. ABS函数

ABS 函数可用于返回数字的绝对值

2. 函数用法

ABS(number)

3. 函数示例

如，ABS(-12)和ABS(12)的返回结果均为 12。

4. 代码实战

首先我们在function包下创建math包，在math包下创建AbsFunction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;/*** 类描述: ABS函数** @author admin* @version 1.0.0* @date 2023/11/23 8:57*/
public class AbsFunction extends Operator {public AbsFunction(String name) {this.name = name;}@Overridepublic Object executeInner(Object[] list) throws Exception {if (list.length == 0) {throw new FormulaException("操作数异常");}// 取出来数据Object result = list[0];if (result instanceof Integer) {int val = ((Integer) result).intValue();// 调用Math函数提供的取绝对值的方法result = Math.abs(val);} else if (result instanceof Double) {double val = ((Double) result).doubleValue();result = Math.abs(val);} else if (result instanceof Float) {double val = ((Float) result).floatValue();result = Math.abs(val);} else if (result instanceof Long) {long val = ((Long) result).longValue();result = Math.abs(val);} else if (result instanceof Short) {short val = ((Short) result).shortValue();result = Math.abs(val);} else {throw new FormulaException("参数数据类型异常");}return result;}
}

把AbsFunction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.AbsFunction;/*** 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"));}
}

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 ABS() throws Exception{FormulaRunner formulaRunner = new FormulaRunner(true,true);// 创建上下文DefaultContext<String, Object> context = new DefaultContext<>();String express = "ABS(-4294967294)";context.put("a",-11.1111);context.put("b",3.0);Object object = formulaRunner.execute(express, context, null, true, true);System.out.println(object);}}

运行结果