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Implemented CSVHandler

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Thomas Battermann 10 years ago committed by Thomas Ba
parent 0f37d5c610
commit 2fa12e3aff
2 changed files with 163 additions and 26 deletions
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14
README.md
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@ -13,7 +13,17 @@ A project for class "programming 2" at Baden-Wuerttemberg Cooperative State Univ
## Todo
- Implement CSVHandler to save CSV data
- Highlight items with priority
- Highlight items past due (and TodoList!)
- filter items (include/exclude done items)
- filter items (include/exclude done items)
## Dependencies
- [Apache Commons Lang](https://commons.apache.org/proper/commons-lang/)
- [Apache Commons Validator](https://commons.apache.org/proper/commons-validator/)
- [Apache Commons Codec](https://commons.apache.org/proper/commons-codec/download_codec.cgi)
or simply:
cd ext
bash get-dependencies.sh

175
src/de/t_battermann/dhbw/todolist/CSVHandler.java
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@ -1,33 +1,160 @@
package de.t_battermann.dhbw.todolist;
import java.io.File;
import java.io.IOException;
import com.opencsv.CSVParser;
import com.opencsv.CSVWriter;
import java.io.*;
import java.nio.charset.Charset;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Map;
import java.util.TreeMap;
/**
* Export the user data in a CSV file
*
* File format:
* USER,uuid,username,password,email
* TODOLIST,username,uuid,name,changeable
* TO DO,username,todolist,uuid,title,comment,dueDate,done,prio
*/
public class CSVHandler implements ExportHandler {
@Override
public void exportToFile(Map<String, User> users, File filename) throws IOException {
// TODO: implement method
}
@Override
public String exportToString(Map<String, User> users) {
// TODO: implement method
return null;
}
@Override
public Map<String, User> importFromFile(File filename) throws IOException, InvalidDataException {
// TODO: implement method
return null;
}
@Override
public Map<String, User> importFromString(String str) throws InvalidDataException {
// TODO: implement method
return null;
}
/**
* Convert a map containing the users to a DOMSource containing XML
*
* @param users The users map
* @return String containing CSV
*/
private String doExport(Map<String, User> users) {
StringWriter sw = new StringWriter();
CSVWriter w = new CSVWriter(sw);
StringWriter s = new StringWriter();
// date formatter
SimpleDateFormat format = new SimpleDateFormat();
format.applyPattern("yyyyMMdd'T'HH:mm:ssZ");
for( User user: users.values()) {
String userData[] = { "USER", user.getUuid(), user.getUsername(), user.getPassword(), user.getEmail() };
w.writeNext(userData);
for( TodoList list: user.getTodoLists() ) {
String listData[] = { "TODOLIST", user.getUsername(), list.getUuid(), list.getName(), list.isChangeable() ? "true" : "false" };
w.writeNext(listData);
for( Todo todo: list.getTodos() ) {
String todoData[] = { "TODO", user.getUsername(), list.getName(), todo.getUuid(), todo.getTitle(), todo.getComment(),
todo.getDueDate() == null ? "0" : format.format(todo.getDueDate().getTime()), todo.isDone() ? "true" : "false", todo.isPrio() ? "true" : "false" };
w.writeNext(todoData);
}
}
}
return sw.toString();
}
@Override
public void exportToFile(Map<String, User> users, File file) throws IOException {
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);
bw.write( doExport(users) );
bw.close();
}
@Override
public String exportToString(Map<String, User> users) {
return doExport(users);
}
/**
* Get a date from a element
*
* @param date The String containing the date
* @return Either the date (if found) or null
*/
private Calendar stringToDate(String date) {
if ( date.equals("0") )
return null;
SimpleDateFormat format = new SimpleDateFormat();
format.applyPattern("yyyyMMdd'T'HH:mm:ssZ");
try {
Calendar r = new GregorianCalendar();
r.setTime(format.parse(date));
return r;
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
/**
* Helper function to convert the xml to a map containing the user data
*
* @param stream InputStream containing XML data
* @return The user object
* @throws IOException
* @throws InvalidDataException
*/
private Map<String, User> doImport(InputStream stream) throws IOException, InvalidDataException {
BufferedReader r = new BufferedReader(new InputStreamReader(stream));
CSVParser c = new CSVParser();
String csv, line[];
Map<String, User> users = new TreeMap<>();
while((csv = r.readLine()) != null) {
line = c.parseLine(csv);
switch( line[0] ) {
case "USER":
if ( line.length != 5 ) {
throw new InvalidDataException("Invalid user: line doesn’t contain 5 elements");
}else if ( users.containsKey( line[2] ) ) {
throw new InvalidDataException("Invalid user: duplicate User!");
}else {
User u = new User(line[1], line[2], line[3], line[4]);
users.put(line[2], u);
}
break;
case "TODOLIST":
if ( line.length != 5 ) {
throw new InvalidDataException("Invalid TodoList: line doesn’t contain 5 elements");
} else if ( !users.containsKey(line[1]) ) {
throw new InvalidDataException("Invalid TodoList: User not found!");
} else if ( users.get(line[1]).getTodoList(line[3]) != null) {
throw new InvalidDataException("Invalid TodoList: duplicate TodoList!");
} else {
TodoList t = new TodoList(line[2],line[3],line[4].equals("true"));
users.get(line[1]).addTodoList(t);
}
break;
case "TODO":
if ( line.length != 9 ) {
throw new InvalidDataException("Invalid Todo: line doesn’t contain 9 elements" + line.length);
} else if ( !users.containsKey(line[1]) ) {
throw new InvalidDataException("Invalid Todo: User not found!");
} else if ( users.get(line[1]).getTodoList(line[2]) == null) {
throw new InvalidDataException("Invalid Todo: TodoList not found!");
} else {
Todo t = new Todo( line[3], line[4], line[5], stringToDate(line[6]), line[7].equals("true"), line[8].equals("true") );
users.get(line[1]).getTodoList(line[2]).addTodo(t);
}
break;
default:
throw new InvalidDataException("Unexpected line identifier.");
}
}
return users;
}
@Override
public Map<String, User> importFromFile(File file) throws IOException, InvalidDataException {
InputStream inputStream = new FileInputStream(file);
return this.doImport(inputStream);
}
@Override
public Map<String, User> importFromString(String str) throws InvalidDataException {
try {
InputStream inputStream = new ByteArrayInputStream(str.getBytes(Charset.forName("UTF-8")));
return this.doImport(inputStream);
} catch (IOException e) {
e.printStackTrace();
return new TreeMap<>();
}
}
}

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