hx-base/my-test/src/main/java/org/example/join/model/TableJoin.java

package org.example.join.model;

import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import org.example.join.sql.SqlConstant;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Getter
@RequiredArgsConstructor
public class TableJoin implements ITable {

    private final String joinType;
    private final ITable table;
    private final List<QueryCondition> queryConditionList = new ArrayList<>();

    @Override
    public String toSql() {
        String on = queryConditionList.stream()
                .filter(ObjectUtil::isNotNull)
                .map(QueryCondition::toSql)
                .filter(StrUtil::isNotBlank)
                .collect(Collectors.joining(SqlConstant.AND));

        return joinType + table.toSql() + (StrUtil.isNotBlank(on) ? SqlConstant.ON + on : StringPool.EMPTY);
    }

}