我有一个场景，我从一个返回文件夹结构的服务获得一个字符串输出，如下所示
id=0c06c81c8052324b;name=Documentation;type=root;|id=0b06c81c80524a87;name=ABC;type=folder;parent=0c06c81c8052324b;|id=0b06c81c80524837;name=Admin;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052483d;name=Admin 2.0;type=folder;parent=0b06c81c80524837;|id=0b06c81c8052483a;name=Panel;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052484a;name=VCM;type=folder;parent=0b06c81c8052483a;|id=0c06c81c80269e63;name=Invoices;type=root;|id=0b06c81c8026a008;name=other;type=folder;parent=0c06c81c80269e63;|id=0b06c81c8027a600;name=Workflow;type=folder;parent=0b06c81c8026a008;|id=0b06c81c8027a601;name=Worksheet;type=folder;parent=0b06c81c8027a600;|id=0c06c81c8051c7d3;name=Receipts;type=root;|id=0b06c81c80545f32;name=VR_2;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f33;name=VR_3;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f30;name=VR_1;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c8053486d;name=VR;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f31;name=test2;type=folder;parent=0b06c81c8053486d;|id=0c06c81c8051c7d2;name=Source;type=root;|id=0b06c81c80524a8b;name=gem;type=folder;parent=0c06c81c8051c7d2;|id=0b06c81c80521681;name=Code;type=folder;parent=0b06c81c80524a8b;|id=0b06c81c8051cba7;name=pfm;type=folder;parent=0b06c81c80524a8b;
我能够编写一个递归逻辑来解析该字符串，以得到如下结构：
Children of DCMGEN -> Documentation, ID: 0c06c81c8052324b
Children of DCMGEN -> Invoices, ID: 0c06c81c80269e63
Children of DCMGEN -> Source, ID: 0c06c81c8051c7d2
Children of DCMGEN -> Receipts, ID: 0c06c81c8051c7d3
Children of Documentation -> ABC, ID: 0b06c81c80524a87
Children of ABC -> Admin, ID: 0b06c81c80524837
Children of ABC -> Panel, ID: 0b06c81c8052483a
Children of Admin -> Admin 2.0, ID: 0b06c81c8052483d
Children of Panel -> VCM, ID: 0b06c81c8052484a
Children of Invoices -> other, ID: 0b06c81c8026a008
Children of other -> Workflow, ID: 0b06c81c8027a600
Children of Workflow -> Worksheet, ID: 0b06c81c8027a601
Children of Source -> gem, ID: 0b06c81c80524a8b
Children of gem -> Code, ID: 0b06c81c80521681
Children of gem -> pfm, ID: 0b06c81c8051cba7
Children of Receipts -> VR_2, ID: 0b06c81c80545f32
Children of Receipts -> VR_3, ID: 0b06c81c80545f33
Children of Receipts -> VR_1, ID: 0b06c81c80545f30
Children of Receipts -> VR, ID: 0b06c81c8053486d
Children of VR -> test2, ID: 0b06c81c80545f31
但是，我想在本地计算机上创建一个文件夹结构，但无法递归创建它。寻找一些解决这个递归问题的线索。有人可以帮忙吗？
DCMGEN
Documentation
ABC
Admin
Admin 2.0
Panel
VCM
Invoices
other
Workflow
Worksheet
Source
gem
Code
pfm
Receipts
VR
test2
VR_1
VR_2
VR_3
下面是我的代码来实现这一点（在其他一些thread on StackOverflow的帮助下）：
mega menu D to.Java
import java.util.ArrayList;
import java.util.List;
public class MegaMenuDTO {
private String Id;
private String name;
private String parentId;
private String type;
private List<MegaMenuDTO> childrenItems;
public MegaMenuDTO() {
this.Id = "";
this.name = "";
this.parentId = "";
this.childrenItems = new ArrayList<MegaMenuDTO>();
}
public String getId() {
return Id;
}
public void setId(String id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getParentId() {
return parentId;
}
public void setParentId(String parentId) {
this.parentId = parentId;
}
public List<MegaMenuDTO> getChildrenItems() {
return childrenItems;
}
public void setChildrenItems(List<MegaMenuDTO> childrenItems) {
this.childrenItems = childrenItems;
}
public void addChildrenItem(MegaMenuDTO childrenItem){
if(!this.childrenItems.contains(childrenItem))
this.childrenItems.add(childrenItem);
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
@Override
public String toString() {
// return "MegaMenuDTO [Id=" + Id + ", name=" + name + ", parentId="
// + parentId + ", childrenItems=" + childrenItems + "]";
return "[name=" + name + ", childrenItems=" + childrenItems + "]";
}
}
menu helper.Java
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
public class MenuHelper {
private static final String TEMP_ROOT_FOLDER = "DCMGEN";
private static final String JAVA_IO_TMPDIR = "java.io.tmpdir";
private static final String FOLDERTREE_STR = "foldertree=";
private static final String RECORD_ELEMENT_DELIM = "[\\|]+";
private static final String SEPARATOR = System.getProperty("file.separator");
private static Map<String, List<MegaMenuDTO>> parentChildMap = new LinkedHashMap<String, List<MegaMenuDTO>>();
private static Map<String, String> idNameMap = new LinkedHashMap<String, String>();
//Test this helper class....
public static void main(String[] args) throws IOException {
final String FOLDER_STRUCTURE = "id=0c06c81c8052324b;name=Documentation;type=cabinet;|id=0b06c81c80524a87;name=ABC;type=folder;parent=0c06c81c8052324b;|id=0b06c81c80524837;name=Admin;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052483d;name=Admin 2.0;type=folder;parent=0b06c81c80524837;|id=0b06c81c8052483a;name=Panel;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052484a;name=VCM;type=folder;parent=0b06c81c8052483a;|id=0c06c81c80269e63;name=Invoices;type=cabinet;|id=0b06c81c8026a008;name=other;type=folder;parent=0c06c81c80269e63;|id=0b06c81c8027a600;name=Workflow;type=folder;parent=0b06c81c8026a008;|id=0b06c81c8027a601;name=Worksheet;type=folder;parent=0b06c81c8027a600;|id=0c06c81c8051c7d3;name=Receipts;type=cabinet;|id=0b06c81c80545f32;name=VR_2;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f33;name=VR_3;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f30;name=VR_1;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c8053486d;name=VR;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f31;name=test2;type=folder;parent=0b06c81c8053486d;|id=0c06c81c8051c7d2;name=Source;type=root;|id=0b06c81c80524a8b;name=gem;type=folder;parent=0c06c81c8051c7d2;|id=0b06c81c80521681;name=Code;type=folder;parent=0b06c81c80524a8b;|id=0b06c81c8051cba7;name=pfm;type=folder;parent=0b06c81c80524a8b;";
System.out.println("Temp folder : " + System.getProperty(JAVA_IO_TMPDIR));
List<FolderObj> folders = MenuHelper.parseResponseString(FOLDER_STRUCTURE);
if(folders != null) {
List<MegaMenuDTO> menuDTOList = MenuHelper.prepareMenu(folders);
List<File> rootDirs = new ArrayList<>();
File rootDir = new File(System.getProperty(JAVA_IO_TMPDIR) + SEPARATOR + TEMP_ROOT_FOLDER);
//Check and Delete the root folder, if present, before processing.
if(rootDir.exists()) {
rootDirs.add(rootDir);
for(File file : rootDirs) {
recursivelyDelete(file);
}
}
//Create a fresh root dir.
rootDirs.clear();
rootDir = createTempRootDir(TEMP_ROOT_FOLDER);
rootDirs.add(rootDir);
//System.out.println("Tree : " + menuDTOList);
for(MegaMenuDTO mmd: menuDTOList){
printMenu(mmd, "\t");
captureIdNameMap(mmd);
printPaths(mmd, TEMP_ROOT_FOLDER + SEPARATOR + mmd.getName());
}
for (Map.Entry<String, List<MegaMenuDTO>> entry : parentChildMap.entrySet()) {
String key = entry.getKey();
List<MegaMenuDTO> value = entry.getValue();
for(MegaMenuDTO dto : value) {
if(idNameMap.get(key) == null) {
System.out.println("Children of " + key + " -> " + dto.getName() + ", ID: " + dto.getId());
} else {
System.out.println("Children of " + idNameMap.get(key) + " -> " + dto.getName() + ", ID: " + dto.getId());
}
}
}
}
}
public static List<FolderObj> parseResponseString(final String input) {
if(input == null) {
return null;
}
List<FolderObj> menuList = new ArrayList<>();
String[] parsedValues = input.split(RECORD_ELEMENT_DELIM);
for(short i=0; i < parsedValues.length; i++) {
menuList.add(digest(filterValue(parsedValues[i])));
}
return menuList;
}
public static String filterValue(String input) {
if(input == null) {
return input;
}
if(input.contains(FOLDERTREE_STR)) {
input = input.substring(input.indexOf(FOLDERTREE_STR) + FOLDERTREE_STR.length());
}
return input;
}
public static FolderObj digest(String input) {
if(input == null) {
return null;
}
Map<String, String> holder = new HashMap<>();
String [] keyVals = input.split(";");
for(String keyVal : keyVals) {
String [] parts = keyVal.split("=");
holder.put(parts[0], parts[1]);
}
FolderObj folderObj = null;
String childId = null;
String name = null;
String type = null;
String parentId = null;
for(Map.Entry<String, String> entry : holder.entrySet()) {
String key = entry.getKey();
if(key.equals("id")) {
childId = entry.getValue();
} else if(key.equals("name")) {
name = entry.getValue();
} else if(key.equals("type")) {
type = entry.getValue();
} else if(key.equals("parent")) {
parentId = entry.getValue();
}
folderObj = new FolderObj(childId, parentId, name, type);
}
return folderObj;
}
public static List<MegaMenuDTO> prepareMenu(List<FolderObj> folderList) {
// Arrange String corresponds to the Id
Map<String, MegaMenuDTO> megaMenuMap = new HashMap<>();
// populate a Map
for(FolderObj folderObj: folderList){
// ----- Child -----
MegaMenuDTO mmdChild;
if(megaMenuMap.containsKey(folderObj.getChildId())){
mmdChild = megaMenuMap.get(folderObj.getChildId());
}
else{
mmdChild = new MegaMenuDTO();
megaMenuMap.put(folderObj.getChildId(),mmdChild);
}
mmdChild.setId(folderObj.getChildId());
mmdChild.setParentId(folderObj.getParentId());
mmdChild.setName(folderObj.getName());
mmdChild.setType(folderObj.getType());
// no need to set ChildrenItems list because the constructor created a new empty list
// ------ Parent ----
MegaMenuDTO mmdParent;
if(megaMenuMap.containsKey(folderObj.getParentId())){
mmdParent = megaMenuMap.get(folderObj.getParentId());
}
else{
mmdParent = new MegaMenuDTO();
megaMenuMap.put(folderObj.getParentId(),mmdParent);
}
mmdParent.setId(folderObj.getParentId());
// mmdParent.setParentId(null);
mmdParent.addChildrenItem(mmdChild);
}
// Get the root
List<MegaMenuDTO> menuList = new ArrayList<MegaMenuDTO>();
for(MegaMenuDTO megaMenuDTO : megaMenuMap.values()){
if(megaMenuDTO.getParentId() == null)
menuList.add(megaMenuDTO);
}
return menuList;
}
private static void printMenu(MegaMenuDTO dto, String tabValue) {
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
System.out.println(tabValue + childDTO.getName());
tabValue = "\t" + tabValue;
printMenu(childDTO, tabValue);
}
}
private static void captureIdNameMap(MegaMenuDTO dto) throws IOException {
idNameMap.put(dto.getId(), dto.getName());
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
idNameMap.put(childDTO.getId(), childDTO.getName());
captureIdNameMap(childDTO);
}
}
private static void printPaths(MegaMenuDTO dto, String name) throws IOException {
if(dto.getParentId() == null) {
if(parentChildMap.get("ROOT") == null) {
List<MegaMenuDTO> parentList = new ArrayList<MegaMenuDTO>();
parentList.add(dto);
parentChildMap.put("ROOT", parentList);
} else {
List<MegaMenuDTO> parentList = parentChildMap.get("ROOT");
parentList.add(dto);
parentChildMap.put("ROOT", parentList);
}
}
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
if (parentChildMap.get(childDTO.getParentId()) == null) {
List<MegaMenuDTO> parentList = new ArrayList<MegaMenuDTO>();
parentList.add(childDTO);
parentChildMap.put(childDTO.getParentId(), parentList);
} else {
List<MegaMenuDTO> parentList = parentChildMap.get(childDTO.getParentId());
parentList.add(childDTO);
parentChildMap.put(childDTO.getParentId(), parentList);
}
System.out.println(name + SEPARATOR + childDTO.getName() + ", ParentId : " + childDTO.getParentId());
createTempRootDir(name + SEPARATOR + childDTO.getName());
name = name + SEPARATOR + childDTO.getName();
printPaths(childDTO, name);
}
}
public static File createTempRootDir(String name) throws IOException {
final File sysTempDir = new File(System.getProperty(JAVA_IO_TMPDIR));
File newTempDir = new File(sysTempDir, name);
if (newTempDir.mkdirs()) {
return newTempDir;
} else {
throw new IOException("Failed to create temp dir named " + newTempDir.getAbsolutePath());
}
}
/**
* Recursively delete file or directory
*
* @param fileOrDir
* the file or dir to delete
* @return true iff all files are successfully deleted
*/
public static void recursivelyDelete(File fileOrDir) throws IOException {
Path directory = Paths.get(fileOrDir.getAbsolutePath());
Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Files.delete(file);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
});
}
}
在阅读了更多有关递归的信息之后，终于开始工作了。以下是任何试图做类似事情的人的新更新代码。没有声称这是最有效或最短的代码，但我能想到的最好。如果某人有改进的版本，我会很高兴看到这一点。
menu helper.Java
public class MenuHelper {
private static final String TEMP_ROOT_FOLDER = "DCMGEN";
private static final String JAVA_IO_TMPDIR = "java.io.tmpdir";
private static final String FOLDERTREE_STR = "foldertree=";
private static final String RECORD_ELEMENT_DELIM = "[\\|]+";
private static final String SEPARATOR = System.getProperty("file.separator");
private static Map<String, List<MegaMenuDTO>> parentChildMap = new LinkedHashMap<String, List<MegaMenuDTO>>();
private static Map<String, String> idNameMap = new LinkedHashMap<String, String>();
//Test this helper class....
public static void main(String[] args) throws IOException {
final String FOLDER_STRUCTURE = "id=0c06c81c8052324b;name=Documentation;type=cabinet;|id=0b06c81c80524a87;name=ABC;type=folder;parent=0c06c81c8052324b;|id=0b06c81c80524837;name=Admin;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052483d;name=Admin 2.0;type=folder;parent=0b06c81c80524837;|id=0b06c81c8052483a;name=Panel;type=folder;parent=0b06c81c80524a87;|id=0b06c81c8052484a;name=VCM;type=folder;parent=0b06c81c8052483a;|id=0c06c81c80269e63;name=Invoices;type=cabinet;|id=0b06c81c8026a008;name=other;type=folder;parent=0c06c81c80269e63;|id=0b06c81c8027a600;name=Workflow;type=folder;parent=0b06c81c8026a008;|id=0b06c81c8027a601;name=Worksheet;type=folder;parent=0b06c81c8027a600;|id=0c06c81c8051c7d3;name=Receipts;type=cabinet;|id=0b06c81c80545f32;name=VR_2;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f33;name=VR_3;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f30;name=VR_1;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c8053486d;name=VR;type=folder;parent=0c06c81c8051c7d3;|id=0b06c81c80545f31;name=test2;type=folder;parent=0b06c81c8053486d;|id=0c06c81c8051c7d2;name=Source;type=root;|id=0b06c81c80524a8b;name=gem;type=folder;parent=0c06c81c8051c7d2;|id=0b06c81c80521681;name=Code;type=folder;parent=0b06c81c80524a8b;|id=0b06c81c8051cba7;name=pfm;type=folder;parent=0b06c81c80524a8b;";
System.out.println("Temp folder : " + System.getProperty(JAVA_IO_TMPDIR));
List<FolderObj> folders = MenuHelper.parseResponseString(FOLDER_STRUCTURE);
if(folders != null) {
List<MegaMenuDTO> menuDTOList = MenuHelper.prepareMenu(folders);
List<File> rootDirs = new ArrayList<>();
File rootDir = new File(System.getProperty(JAVA_IO_TMPDIR) + SEPARATOR + TEMP_ROOT_FOLDER);
//Check and Delete the root folder, if present, before processing.
if(rootDir.exists()) {
rootDirs.add(rootDir);
for(File file : rootDirs) {
recursivelyDelete(file);
}
}
//Create a fresh root dir.
rootDirs.clear();
rootDir = createTempRootDir(TEMP_ROOT_FOLDER);
rootDirs.add(rootDir);
//System.out.println("Tree : " + menuDTOList);
for(MegaMenuDTO mmd: menuDTOList){
printMenu(mmd, "\t");
captureIdNameMap(mmd);
printPaths(mmd, TEMP_ROOT_FOLDER + SEPARATOR + mmd.getName());
}
for (Map.Entry<String, List<MegaMenuDTO>> entry : parentChildMap.entrySet()) {
String key = entry.getKey();
List<MegaMenuDTO> value = entry.getValue();
for(MegaMenuDTO dto : value) {
if(idNameMap.get(key) == null) {
System.out.println("Children of " + key + " -> " + dto.getName() + ", ID: " + dto.getId());
} else {
System.out.println("Children of " + idNameMap.get(key) + " -> " + dto.getName() + ", ID: " + dto.getId());
}
}
}
System.out.println("--------------------------------------\n");
for (Map.Entry<String, List<MegaMenuDTO>> entry : parentChildMap.entrySet()) {
String key = entry.getKey();
List<MegaMenuDTO> value = entry.getValue();
if(key.equals("ROOT")) {
for(MegaMenuDTO dto : value) {
System.out.println("Root Folder is : " + dto.getName());
//createTempRootDir(TEMP_ROOT_FOLDER + SEPARATOR + dto.getName());
System.out.println(TEMP_ROOT_FOLDER + SEPARATOR + dto.getName());
printFoldersRecursively(parentChildMap.get(dto.getId()), TEMP_ROOT_FOLDER + SEPARATOR + dto.getName());
}
}
}
}
}
public static void printFoldersRecursively(List<MegaMenuDTO> value, String rootPath) throws IOException {
for (MegaMenuDTO inDTO1 : value) {
System.out.println(rootPath + SEPARATOR + inDTO1.getName());
for(MegaMenuDTO childItem : inDTO1.getChildrenItems()) {
System.out.println(rootPath + SEPARATOR + inDTO1.getName() + SEPARATOR + childItem.getName());
printFoldersRecursively(childItem.getChildrenItems(), rootPath + SEPARATOR + inDTO1.getName() + SEPARATOR + childItem.getName());
}
}
}
public static List<FolderObj> parseResponseString(final String input) {
if(input == null) {
return null;
}
List<FolderObj> menuList = new ArrayList<>();
String[] parsedValues = input.split(RECORD_ELEMENT_DELIM);
for(short i=0; i < parsedValues.length; i++) {
menuList.add(digest(filterValue(parsedValues[i])));
}
return menuList;
}
public static String filterValue(String input) {
if(input == null) {
return input;
}
if(input.contains(FOLDERTREE_STR)) {
input = input.substring(input.indexOf(FOLDERTREE_STR) + FOLDERTREE_STR.length());
}
return input;
}
public static FolderObj digest(String input) {
if(input == null) {
return null;
}
Map<String, String> holder = new HashMap<>();
String [] keyVals = input.split(";");
for(String keyVal : keyVals) {
String [] parts = keyVal.split("=");
holder.put(parts[0], parts[1]);
}
FolderObj folderObj = null;
String childId = null;
String name = null;
String type = null;
String parentId = null;
for(Map.Entry<String, String> entry : holder.entrySet()) {
String key = entry.getKey();
if(key.equals("id")) {
childId = entry.getValue();
} else if(key.equals("name")) {
name = entry.getValue();
} else if(key.equals("type")) {
type = entry.getValue();
} else if(key.equals("parent")) {
parentId = entry.getValue();
}
folderObj = new FolderObj(childId, parentId, name, type);
}
return folderObj;
}
public static List<MegaMenuDTO> prepareMenu(List<FolderObj> folderList) {
// Arrange String corresponds to the Id
Map<String, MegaMenuDTO> megaMenuMap = new HashMap<>();
// populate a Map
for(FolderObj folderObj: folderList){
MegaMenuDTO mmdChild;
if(megaMenuMap.containsKey(folderObj.getChildId())){
mmdChild = megaMenuMap.get(folderObj.getChildId());
} else{
mmdChild = new MegaMenuDTO();
megaMenuMap.put(folderObj.getChildId(),mmdChild);
}
mmdChild.setId(folderObj.getChildId());
mmdChild.setParentId(folderObj.getParentId());
mmdChild.setName(folderObj.getName());
mmdChild.setType(folderObj.getType());
// ------ Parent ----
MegaMenuDTO mmdParent;
if(megaMenuMap.containsKey(folderObj.getParentId())){
mmdParent = megaMenuMap.get(folderObj.getParentId());
} else{
mmdParent = new MegaMenuDTO();
megaMenuMap.put(folderObj.getParentId(),mmdParent);
}
mmdParent.setId(folderObj.getParentId());
mmdParent.addChildrenItem(mmdChild);
}
// Get the root
List<MegaMenuDTO> menuList = new ArrayList<MegaMenuDTO>();
for(MegaMenuDTO megaMenuDTO : megaMenuMap.values()){
if(megaMenuDTO.getParentId() == null)
menuList.add(megaMenuDTO);
}
return menuList;
}
private static void printMenu(MegaMenuDTO dto, String tabValue) {
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
System.out.println(tabValue + childDTO.getName());
tabValue = "\t" + tabValue;
printMenu(childDTO, tabValue);
}
}
private static void captureIdNameMap(MegaMenuDTO dto) throws IOException {
idNameMap.put(dto.getId(), dto.getName());
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
idNameMap.put(childDTO.getId(), childDTO.getName());
captureIdNameMap(childDTO);
}
}
private static void printPaths(MegaMenuDTO dto, String name) throws IOException {
if(dto.getParentId() == null) {
if(parentChildMap.get("ROOT") == null) {
List<MegaMenuDTO> parentList = new ArrayList<MegaMenuDTO>();
parentList.add(dto);
parentChildMap.put("ROOT", parentList);
} else {
List<MegaMenuDTO> parentList = parentChildMap.get("ROOT");
parentList.add(dto);
parentChildMap.put("ROOT", parentList);
}
}
for(MegaMenuDTO childDTO : dto.getChildrenItems()) {
if (parentChildMap.get(childDTO.getParentId()) == null) {
List<MegaMenuDTO> parentList = new ArrayList<MegaMenuDTO>();
parentList.add(childDTO);
parentChildMap.put(childDTO.getParentId(), parentList);
} else {
List<MegaMenuDTO> parentList = parentChildMap.get(childDTO.getParentId());
parentList.add(childDTO);
parentChildMap.put(childDTO.getParentId(), parentList);
}
System.out.println(name + SEPARATOR + childDTO.getName() + ", ParentId : " + childDTO.getParentId());
createTempRootDir(name + SEPARATOR + childDTO.getName());
name = name + SEPARATOR + childDTO.getName();
printPaths(childDTO, name);
}
}
public static File createTempRootDir(String name) throws IOException {
final File sysTempDir = new File(System.getProperty(JAVA_IO_TMPDIR));
File newTempDir = new File(sysTempDir, name);
if (newTempDir.mkdirs()) {
return newTempDir;
} else {
throw new IOException("Failed to create temp dir named " + newTempDir.getAbsolutePath());
}
}
/**
* Recursively delete file or directory
*
* @param fileOrDir
* the file or dir to delete
* @return true iff all files are successfully deleted
*/
public static void recursivelyDelete(File fileOrDir) throws IOException {
Path directory = Paths.get(fileOrDir.getAbsolutePath());
Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Files.delete(file);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
});
}
}