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：
java
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：
java
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
java
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
