songyunpeng
5 years ago
7 changed files with 187 additions and 11 deletions
@ -0,0 +1,59 @@ |
|||||
|
/** |
||||
|
* Copyright (c) 2018 人人开源 All rights reserved. |
||||
|
* |
||||
|
* https://www.renren.io
|
||||
|
* |
||||
|
* 版权所有，侵权必究！ |
||||
|
*/ |
||||
|
|
||||
|
package com.elink.esua.epdc.dto; |
||||
|
|
||||
|
import java.io.Serializable; |
||||
|
import java.util.ArrayList; |
||||
|
import java.util.List; |
||||
|
|
||||
|
/** |
||||
|
* 树节点，所有需要实现树节点的，都需要继承该类 |
||||
|
* |
||||
|
* @author Mark sunlightcs@gmail.com |
||||
|
* @since 1.0.0 |
||||
|
*/ |
||||
|
public class TreeNode<T> implements Serializable { |
||||
|
private static final long serialVersionUID = 1L; |
||||
|
/** |
||||
|
* 主键 |
||||
|
*/ |
||||
|
private String id; |
||||
|
/** |
||||
|
* 上级ID |
||||
|
*/ |
||||
|
private String pid; |
||||
|
/** |
||||
|
* 子节点列表 |
||||
|
*/ |
||||
|
private List<T> children = new ArrayList<>(); |
||||
|
|
||||
|
public String getId() { |
||||
|
return id; |
||||
|
} |
||||
|
|
||||
|
public void setId(String id) { |
||||
|
this.id = id; |
||||
|
} |
||||
|
|
||||
|
public String getPid() { |
||||
|
return pid; |
||||
|
} |
||||
|
|
||||
|
public void setPid(String pid) { |
||||
|
this.pid = pid; |
||||
|
} |
||||
|
|
||||
|
public List<T> getChildren() { |
||||
|
return children; |
||||
|
} |
||||
|
|
||||
|
public void setChildren(List<T> children) { |
||||
|
this.children = children; |
||||
|
} |
||||
|
} |
||||
@ -0,0 +1,81 @@ |
|||||
|
/** |
||||
|
* Copyright (c) 2018 人人开源 All rights reserved. |
||||
|
* |
||||
|
* https://www.renren.io
|
||||
|
* |
||||
|
* 版权所有，侵权必究！ |
||||
|
*/ |
||||
|
|
||||
|
package com.elink.esua.epdc.modules.moduleCategory.utils; |
||||
|
|
||||
|
import com.elink.esua.epdc.commons.tools.validator.AssertUtils; |
||||
|
import com.elink.esua.epdc.dto.TreeNode; |
||||
|
|
||||
|
import java.util.ArrayList; |
||||
|
import java.util.LinkedHashMap; |
||||
|
import java.util.List; |
||||
|
import java.util.Map; |
||||
|
|
||||
|
/** |
||||
|
* 树形结构工具类，如：菜单、部门等 |
||||
|
* |
||||
|
* @author Mark sunlightcs@gmail.com |
||||
|
* @since 1.0.0 |
||||
|
*/ |
||||
|
public class TreeUtils { |
||||
|
|
||||
|
/** |
||||
|
* 根据pid，构建树节点 |
||||
|
*/ |
||||
|
public static <T extends TreeNode> List<T> build(List<T> treeNodes, String pid) { |
||||
|
//pid不能为空
|
||||
|
AssertUtils.isNull(pid, "pid"); |
||||
|
|
||||
|
List<T> treeList = new ArrayList<>(); |
||||
|
for(T treeNode : treeNodes) { |
||||
|
if (pid.equals(treeNode.getPid())) { |
||||
|
treeList.add(findChildren(treeNodes, treeNode)); |
||||
|
} |
||||
|
} |
||||
|
|
||||
|
return treeList; |
||||
|
} |
||||
|
|
||||
|
/** |
||||
|
* 查找子节点 |
||||
|
*/ |
||||
|
private static <T extends TreeNode> T findChildren(List<T> treeNodes, T rootNode) { |
||||
|
for(T treeNode : treeNodes) { |
||||
|
if(rootNode.getId().equals(treeNode.getPid())) { |
||||
|
rootNode.getChildren().add(findChildren(treeNodes, treeNode)); |
||||
|
} |
||||
|
} |
||||
|
return rootNode; |
||||
|
} |
||||
|
|
||||
|
/** |
||||
|
* 构建树节点 |
||||
|
*/ |
||||
|
public static <T extends TreeNode> List<T> build(List<T> treeNodes) { |
||||
|
List<T> result = new ArrayList<>(); |
||||
|
|
||||
|
//list转map
|
||||
|
Map<String, T> nodeMap = new LinkedHashMap<>(treeNodes.size()); |
||||
|
for(T treeNode : treeNodes){ |
||||
|
nodeMap.put(treeNode.getId(), treeNode); |
||||
|
} |
||||
|
|
||||
|
for(T node : nodeMap.values()) { |
||||
|
T parent = nodeMap.get(node.getPid()); |
||||
|
if(parent != null && !(node.getId().equals(parent.getId()))){ |
||||
|
parent.getChildren().add(node); |
||||
|
continue; |
||||
|
} |
||||
|
|
||||
|
result.add(node); |
||||
|
} |
||||
|
|
||||
|
return result; |
||||
|
} |
||||
|
|
||||
|
} |
||||
Loading…
Reference in new issue