Develop Reference

Listing public folders

I'm writing a program for importing contacts from an ERP system to Outlook. Different emails will receive different lists of contacts from ERP. The idea here is, in each email I have a public contact folder that can be accessed by a technical user. The technical user can write contacts into this folder. Here is the code for searching the folder:
protected FolderId findFolderId(String folderDisplayName, String userEmail) throws Exception {
Mailbox userMailbox = new Mailbox(userEmail);
FolderId contactRootFolder = new FolderId(WellKnownFolderName.Root, userMailbox);
FolderId result = null;
FolderView view = new FolderView(Integer.MAX_VALUE);
view.setPropertySet(new PropertySet(BasePropertySet.IdOnly, FolderSchema.DisplayName));
view.setTraversal(FolderTraversal.Deep);
FindFoldersResults findFolderResults = this.service.findFolders(contactRootFolder, view);
//find specific folder
for (Folder f : findFolderResults) {
if (folderDisplayName.equals(f.getDisplayName())) {
result = f.getId();
}
}
return result;
}
The service object is created as follows:
this.service = new ExchangeService();
ExchangeCredentials credentials = new WebCredentials(userName, passWord);
this.service.setCredentials(credentials);
try {
this.service.setUrl(new URI(URL));
} catch (URISyntaxException e) {
LOGGER.error(e);
}
Where URL is the end point for the Exchange server (for Office 365 it is https://outlook.office365.com/EWS/Exchange.asmx).
The code works with Office 2010, I get the Id from that folder, connect to it and save the contacts. After the migration to Office 365, we can't find the public folder. It can just find a folder with the name "PeoplePublicData". (I don't even know that folder exists.)

Throttling in Office365 means your code will only return the first 1000 folder in the Mailbox so if what your looking for isn't within that result set that would be one reason. I would suggest you get rid of
FolderView view = new FolderView(Integer.MAX_VALUE);
and change it to
FolderView view = new FolderView(1000);
and then page the results https://msdn.microsoft.com/en-us/library/office/dn592093(v=exchg.150).aspx which will allow you to get all the Folder in a Mailbox. Also unless you are looking for something in the Non_IPM_Subtree of the Mailbox start the search with MsgFolderRoot eg
FolderId contactRootFolder = new FolderId(WellKnownFolderName.MsgFolderRoot, userMailbox);
That will reduce the number of folders returned.
Also why don't you use a SearchFilter to search for the folder you are after eg https://msdn.microsoft.com/en-us/library/office/dd633627(v=exchg.80).aspx this would eliminate the need to page the results,

Using SQLite in Codename One Application

I have a working sqlite db which I have place in my /src folder.
I then went onto the Codename One website and followed their doc example
Database db = null;
Cursor cur = null;
try {
db = Display.getInstance().openOrCreate("MyDb.db");
if(query.getText().startsWith("select")) {
cur = db.executeQuery(query.getText());
int columns = cur.getColumnCount();
frmMain.removeAll();
if(columns > 0) {
boolean next = cur.next();
if(next) {
ArrayList<String[]> data = new ArrayList<>();
String[] columnNames = new String[columns];
for(int iter = 0 ; iter < columns ; iter++) {
columnNames[iter] = cur.getColumnName(iter);
}
while(next) {
Row currentRow = cur.getRow();
String[] currentRowArray = new String[columns];
for(int iter = 0 ; iter < columns ; iter++) {
currentRowArray[iter] = currentRow.getString(iter);
}
data.add(currentRowArray);
next = cur.next();
}
Object[][] arr = new Object[data.size()][];
data.toArray(arr);
frmMain.add(BorderLayout.CENTER, new Table(new DefaultTableModel(columnNames, arr)));
} else {
frmMain.add(BorderLayout.CENTER, "Query returned no results");
}
} else {
frmMain.add(BorderLayout.CENTER, "Query returned no results");
}
} else {
db.execute(query.getText());
frmMain.add(BorderLayout.CENTER, "Query completed successfully");
}
frmMain.revalidate();
} catch(IOException err) {
frmMain.removeAll();
frmMain.add(BorderLayout.CENTER, "Error: " + err);
frmMain.revalidate();
} finally {
Util.cleanup(db);
Util.cleanup(cur);
}
However when I run the example and try and execute a simple select query I get this error ...
java.sql.SQLException: [SQLITE_ERROR] SQL error or missing database (no such table: MyTable)
So I have added the DB
I have used the 'openOrCreate' statement
Have I missed a step?
Thanks

Are you shure that you current working directory at execution is ./src ?
Try
db = Display.getInstance().openOrCreate("./src/MyDb.db");
or open with absolute filename:
db = Display.getInstance().openOrCreate("/path/to/src/MyDb.db");

You can try this cn1lib https://github.com/shannah/cn1-data-access-lib
I have used it and it works a charm, except doesn't work for 2 tables in the same query and can't perform delete operations.
Cheers

Thanks for all the input guys.
Unfortunately none of the advice worked for me.
However I did solve it in the end.
It turns out that there is a folder in my home directory called '.cn1/database'. Once I placed the DB into this folder it worked.
Two things:
1] If the db does not exist then it will create it and place it into this directory
2] The db does not show up anywhere in Netbeans (well not that I could see anyway)
Thanks again

From the developer guide:
Some SQLite apps ship with a "ready made" database. We allow you to
replace the DB file by using the code:
String path = Display.getInstance().getDatabasePath(“databaseName”);
You can then use the FileSystemStorage class to write the content of
your DB file into the path. Notice that it must be a valid SQLite
file!
Important: getDatabasePath() is not supported in the Javascript port. It
will always return null.
This is very useful for applications that need to synchronize with a
central server or applications that ship with a large database as part
of their core product.
You are relying on paths that make sense in the simulator, in the device you need to copy a resource into location. Check out the SQL demo where this is implemented: https://www.codenameone.com/blog/sql-demo-revisited.html

Use following code to copy database to Codenameone storage after put the database file in src folder, the database will copy to directory ".cn1/database" after running
String DB_NAME = "DBNAME.db";
Database temp_db = Database.openOrCreate(DB_NAME); //To create an empty file before copy, otherwise Android will throw file not found exception
temp_db.close();
String p = Database.getDatabasePath(DB_NAME);
OutputStream o = FileSystemStorage.getInstance().openOutputStream(p);
InputStream i = Display.getInstance().getResourceAsStream(getClass(), "/" + DB_NAME);
Util.copy(i, o);

This doesn't seem like a complete answer.
I'm going through the demo, and something seems to be missing:
Shouldn't a build task copy this db resource to the correct target folder? Otherwise how can a deployment ever work? (if the db doesnt get packaged up then how will it get deployed?) without it the app cant run

Redis java api for inserting multiple values

I have a csv file named abc.csv which contains data as follows :
All,Friday,0:00,315.06,327.92,347.24
All,Friday,1:00,316.03,347.73,370.55
and so on .....
I wish to import the data into Redis. How to do it through the Java API.
Please suggest the steps to do this.
I wish to run the jar and get the data imported into Redis db.
Any help on mass insert would also be helpful in case Java option is not possible.

You can do it by using Jedis(https://github.com/xetorthio/jedis), java client for redis. Just create a class with main method and create a connection, set keys.
void processData(){
List<String> lines = Files.readAllLines(
Paths.get("\Path\abc.csv"), Charset.forName("UTF-8"));
Jedis connection = new Jedis("host", port);
Pipeline p = connection.pipelined();
for(String line: lines){
String key = getKey(line);
String value = getValue(line);
p.set(key,value);
}
p.sync();
}
If the file is big you can create an inputstream out of it and read line by line instead of loading the whole file. You should also than call p.sync() in batches, just keep a counter and do a modulo with batch size.

Redisson allows to organize multiple commands to one. This called Redis pipelining. Here is example:
List<String> lines = ...
RBatch batch = redisson.createBatch();
RList<String> list = batch.getList("yourList");
for(String line: lines){
String key = getKey(line);
batch.getBucket(key).set(line);
}
// send to Redis as single command
batch.execute();

You can use Jedis Lib. Here I have extended my Java Object to get key and Hash to set in the object. In your case, you can have a list of parsed CSV values and keys directly sent as a list.
private static final int BATCH_SIZE = 1000;
public void setRedisHashInBatch(List<? extends RedisHashMaker> Obj) {
try (Jedis jedis = jedisPool.getResource()) {
log.info("Connection IP -{}", jedis.getClient().getSocket().getInetAddress());
Pipeline p = jedis.pipelined();
log.info("Setting Records in Cache. Size: " + Obj.size());
int j = 0;
for (RedisHashMaker obj : Obj) {
p.hmset(obj.getUniqueKey(), obj.getRedisHashStringFromObject());
j++;
if (j == BATCH_SIZE) {
p.sync();
j = 0;
}
}
p.sync();
}
}

Save Excel file with OLE, Java on Eclipse RCP Application

I try to Save an Excel file. The Excel file is a template with makros (*.xltm). I can open the file and edit the content, but if i try to save the destination Excel file is corrupt.
I try to save the file with:
int id = _workbook.getIDsOfNames(new String[] {"Save"})[0];
_workbook.invoke(id);
or/and
_xlsClientSite.save(_file, true);

You might try specifying a file format in your Save call.
If you're lucky, you can find the file format code you need in the Excel help. If you can't find what you need there, you'll have to get your hands dirty using the OLEVIEW.EXE program. There's likely a copy of it sitting on your hard drive somewhere, but if not, it's easy enough to find a copy with a quick Google search.
To use OLEVIEW.EXE:
Run it
Crack open the 'Type Libraries' entry
Find the version of Excel that you're using
Open that item
Search the enormous pile of text that's displayed for the string 'XlFileFormat'
Examine the XLFileFormat enum for a code that seems promising
If you are using Office2007 ("Excel12") like I am, you might try one of these values:
xlOpenXMLWorkbookMacroEnabled = 52
xlOpenXMLTemplateMacroEnabled = 53
Here's a method that I use to save Excel files using OLE:
/**
* Save the given workbook in the specified format.
*
* #param controlSiteAuto the OLE control site to use
* #param filepath the file to save to
* #param formatCode XlFileFormat code representing the file format to save as
* #param replaceExistingWithoutPrompt true to replace an existing file quietly, false to ask the user first
*/
public void saveWorkbook(OleAutomation controlSiteAuto, String filepath, Integer formatCode, boolean replaceExistingWithoutPrompt) {
Variant[] args = null;
Variant result = null;
try {
// suppress "replace existing?" prompt, if necessary
if (replaceExistingWithoutPrompt) {
setPropertyOnObject(controlSiteAuto, "Application", "DisplayAlerts", "False");
}
// if the given formatCode is null, for some reason, use a reasonable default
if (formatCode == null) {
formatCode = 51; // xlWorkbookDefault=51
}
// save the workbook
int[] id = controlSiteAuto.getIDsOfNames(new String[] {"SaveAs", "FileName", "FileFormat"});
args = new Variant[2];
args[0] = new Variant(filepath);
args[1] = new Variant(formatCode);
result = controlSiteAuto.invoke(id[0], args);
if (result == null || !result.getBoolean()) {
throw new RuntimeException("Unable to save active workbook");
}
// enable alerts again, if necessary
if (replaceExistingWithoutPrompt) {
setPropertyOnObject(controlSiteAuto, "Application", "DisplayAlerts", "True");
}
} finally {
cleanup(args);
cleanup(result);
}
}
protected void cleanup(Variant[] variants) {
if (variants != null) {
for (int i = 0; i < variants.length; i++) {
if (variants[i] != null) {
variants[i].dispose();
}
}
}
}

jgit repository browser

I would like to create a git repository browser with jgit. But i don't know how to get the last modified date and the last commit message for a file. Here is my current code for the browser:
File directory = new File("/Users/sdorra/.scm/repositories/git/scm-git");
Repository repository =
RepositoryCache.open(RepositoryCache.FileKey.lenient(directory,
FS.DETECTED), true);
try
{
ObjectId revId = repository.resolve(Constants.HEAD);
DirCache cache = new DirCache(directory, FS.DETECTED);
TreeWalk treeWalk = new TreeWalk(repository);
treeWalk.addTree(new RevWalk(repository).parseTree(revId));
treeWalk.addTree(new DirCacheIterator(cache));
while (treeWalk.next())
{
System.out.println("---------------------------");
System.out.append("name: ").println(treeWalk.getNameString());
System.out.append("path: ").println(treeWalk.getPathString());
ObjectLoader loader = repository.open(treeWalk.getObjectId(0));
System.out.append("directory: ").println(loader.getType()
== Constants.OBJ_TREE);
System.out.append("size: ").println(loader.getSize());
// ???
System.out.append("last modified: ").println("???");
System.out.append("message: ").println("???");
}
}
finally
{
if (repository != null)
{
repository.close();
}
}
It is possible to get the last commit of a file?
Note: My git repository is a bare repository without working copy.

You're using lower level JGit API, why don't you use LogCommand via the org.eclipse.jgit.api package? Then use addPath(...), call()...
After that, you should get a list of RevCommit's for the specified path.