51.仿简道云公式函数实战-文本函数-JOIN

1. JOIN函数

JOIN 函数可通过连接符将数组的值连成文本。

2. 函数用法

JOIN(数组,"连接符")

3. 函数示例

如需将复选框中勾选的选项通过”-“组合在一起，则可设置公式为JOIN(复选框组,"-")

4. 代码实战

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

package com.ql.util.express.self.combat.function.text;

import com.ql.util.express.Operator;
import com.ql.util.express.self.combat.exception.FormulaException;

import java.lang.reflect.Array;
import java.util.List;

/**
 * 类描述: JOIN函数
 *
 * @author admin
 * @version 1.0.0
 * @date 2023/11/24 14:01
 */
public class JoinFunction extends Operator {

    public JoinFunction(String name) {
        this.name = name;
    }

    @Override
    public Object executeInner(Object[] list) throws Exception {

        if (list.length == 0) {
            throw new FormulaException("操作数异常");
        }

        Object rst = null;
        Object arr = list[0];

        if ((arr.getClass().isArray() || arr instanceof List)) {
            StringBuilder sb = new StringBuilder();
            if (arr.getClass().isArray()) {
                int len = Array.getLength(arr);
                Object opt = list[list.length-1];

                for (int i=0;i<len;i++) {
                    sb.append(Array.get(arr, i)).append(opt);
                }
                rst = sb.substring(0,sb.length()-1);
            } else if (arr instanceof List){
                List<Object> objs = (List<Object>) arr;
                Object opt = list[list.length-1];
                for (int i=0;i<objs.size();i++) {
                    sb.append(objs.get(i)).append(opt);
                }
                rst = sb.substring(0,sb.length()-1);
            } else {
                throw new FormulaException("操作数类型异常");
            }
        } else {
            StringBuilder sb = new StringBuilder();
            // 操作符号
            Object opt = list[list.length-1];
            // 循环
            for (int i=0;i<list.length-1;i++) {
                sb.append(list[i]).append(opt);
            }

            rst = sb.substring(0,sb.length()-1);
        }
        return rst;
    }
}

把JoinFunction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.*;
import com.ql.util.express.self.combat.function.text.*;

/**
 * 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);
    }

    @Override
    public 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();

        // 文本函数
        this.addTextFunction();
    }

    public void addTextFunction() {
        // CHAR函数
        this.addFunction("CHAR",new CharFunction("CHAR"));

        // CONCATENATE函数
        this.addFunction("CONCATENATE",new ConcatenateFunction("CONCATENATE"));

        // EXACT函数
        this.addFunction("EXACT",new ExactFunction("EXACT"));

        // IP函数
        this.addFunction("IP",new IpFunction("IP"));

        // ISEMPTY函数
        this.addFunction("ISEMPTY",new IsEmptyFunction("ISEMPTY"));

        // JOIN函数
        this.addFunction("JOIN",new JoinFunction("JOIN"));
    }

    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"));

        // SIN函数
        this.addFunction("SIN",new SinFunction("SIN"));

        // SMALL函数
        this.addFunction("SMALL",new SmallFunction("SMALL"));

        // SQRT函数
        this.addFunction("SQRT",new SqrtFunction("SQRT"));

        // SUM函数
        this.addFunction("SUM",new SumFunction("SUM"));

        // SUMIF函数
        this.addFunction("SUMIF",new SumIfFunction("SUMIF"));

        // SUMIFS函数
        this.addFunction("SUMIFS",new SumIfsFunction("SUMIFS"));

        // SUMPRODUCT函数
        this.addFunction("SUMPRODUCT",new SumProductFunction("SUMPRODUCT"));

        // TAN函数
        this.addFunction("TAN",new TanFunction("TAN"));

    }
}

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 {

    @Test
    public void JOIN() throws Exception{

        FormulaRunner formulaRunner = new FormulaRunner(true,true);
        // 创建上下文
        DefaultContext<String, Object> context = new DefaultContext<>();
        String express = "JOIN([1,2,3],'%')";
        Object object = formulaRunner.execute(express, context, null, true, true);
        System.out.println(object);
    }

}

运行结果