TreeBuilder.java
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package com.lhcredit.project.business.apiDataService.common;
import com.lhcredit.project.business.apiDataService.domain.ApiDataService;
import com.lhcredit.project.business.apiDataService.domain.ApiDataTreeNode;
import com.lhcredit.project.business.zareaInfo.domain.ZareaInfo;
import com.lhcredit.project.business.zindustryInfo.domain.ZindustryInfo;
import java.util.*;
import java.util.stream.Collectors;
public class TreeBuilder {
public static List<ApiDataTreeNode> buildTree(List<ApiDataService> flatList) {
Map<Integer, ApiDataTreeNode> nodeMap = new HashMap<>();
flatList.forEach(data -> nodeMap.put(data.getId(), new ApiDataTreeNode(data)));
List<ApiDataTreeNode> rootNodes = new ArrayList<>();
for (ApiDataService data : flatList) {
ApiDataTreeNode node = nodeMap.get(data.getId());
if (data.getParentId() == null || data.getParentId() == 0) {
rootNodes.add(node);
} else {
ApiDataTreeNode parent = nodeMap.get(data.getParentId());
if (parent != null) {
parent.addChild(node);
}
}
}
return rootNodes;
}
/**
* 构建树形结构
* @param dataList 所有地区数据
* @return 根节点列表（省级）
*/
public static List<ZareaInfo> buildAreaTree(List<ZareaInfo> dataList) {
if (dataList == null || dataList.isEmpty()) {
return null;
}
List<ZareaInfo> collect20 = dataList.stream().filter(item -> Objects.equals(item.getCType(),"20") && item.getParentId() != -1).collect(Collectors.toList());
List<ZareaInfo> collect30 = dataList.stream().filter(item -> Objects.equals(item.getCType(),"30")).collect(Collectors.toList());
List<ZareaInfo> collect40 = dataList.stream().filter(item -> Objects.equals(item.getCType(),"40")).collect(Collectors.toList());
collect20.forEach(item -> {
List<ZareaInfo> collect = collect30.stream().filter(item30 -> item30.getParentId().equals(item.getCId())).collect(Collectors.toList());
item.setChildren(collect);
});
collect30.forEach(item -> {
List<ZareaInfo> collect = collect40.stream().filter(item40 -> item40.getParentId().equals(item.getCId())).collect(Collectors.toList());
item.setChildren(collect);
});
return collect20;
}
// 打印树结构（可选）
public static void printTree(List<ApiDataTreeNode> nodes, int depth) {
for (ApiDataTreeNode node : nodes) {
for (int i = 0; i < depth; i++) {
System.out.print("--");
}
System.out.println(node.getDataName());
printTree(node.getChildren(), depth + 1);
}
}
public static List<ZindustryInfo> buildIndustryTree(List<ZindustryInfo> industryType) {
if (industryType == null || industryType.isEmpty()) {
return null;
}
// List<ZindustryInfo> garade1 = industryType.stream().filter(item -> item.getGarade() == 1).collect(Collectors.toList());
List<ZindustryInfo> garade2 = industryType.stream().filter(item -> item.getGarade() == 2).collect(Collectors.toList());
List<ZindustryInfo> garade3 = industryType.stream().filter(item -> item.getGarade() == 3).collect(Collectors.toList());
/*garade1.forEach(item -> {
List<ZindustryInfo> collect = garade2.stream().filter(item2 -> item2.getParentId().equals(item.getId())).collect(Collectors.toList());
item.setChildren(collect);
});*/
garade2.forEach(item -> {
List<ZindustryInfo> collect = garade3.stream().filter(item3 -> item3.getParentId().equals(item.getId())).collect(Collectors.toList());
item.setChildren(collect);
});
return garade2;
}
}