1. COS函数

COS 函数可用于计算角度的余弦值，返回 -1 到 1 之间的数值。

2. 函数用法

COS(弧度)

3. 函数示例

如计算 COS(60°) 的值，可设置公式为COS(RADIANS(60))，返回 0.5。

4. 代码实战

首先我们在function包下创建math包，在math包下创建CosFunction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: COS函数** @author admin* @version 1.0.0* @date 2023/11/23 9:38*/
public class CosFunction extends Operator {public CosFunction(String name) {this.name = name;}@Overridepublic Object executeInner(Object[] objects) throws Exception {// 参数校验if (objects.length == 0) {throw new FormulaException("操作数异常");}double hudu = Double.parseDouble(objects[0].toString());Object result = Math.cos(hudu);return result;}
}

把CosFunction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"));}
}

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 COS() throws Exception{FormulaRunner formulaRunner = new FormulaRunner(true,true);// 创建上下文DefaultContext<String, Object> context = new DefaultContext<>();String express = "COS(RADIANS(a))";context.put("a",60.0);Object object = formulaRunner.execute(express, context, null, true, true);System.out.println(object);}}

运行结果