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• Porting from GAE to TomCat or another servlet server

  - by bach

  Hi guys, I'm unhappy from GAE because - One can't have a global variable and the 'synchronize' keyword. Instead one have to catch a basically DB transcational exception and retry in a while loop - which will eat all my free CPU time and will start costing me money as I reach the google's qouata. Is it safe to use synchronize inside a doPost() in tomcat? (i guess that it's ok as long as all the servlets are running on on 1 VM?). If not in all tomcat configurations, how do I configure tomcat to make it safe? How can I convert a GAE app to my own tomcat server? - How to install DataNucleus Access Platform on tomcat? Best regards

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• Consultant "branding" problem

  - by James Jones

  Where I work, we employ a consultant to do a considerable amount of work for us to hold us over until we can hire/train more staff. He has been working with us for quite a long time now, and he has always had this strange habit of leaving his initials on EVERYTHING he touches, as if its his sort of branding or advertising. And by everything, I mean: Database names Table names Variable names Web service names File names Server names etc... Is this a common practice among consultants? We politely asked if he could remove some of the branding, but he typically scoffs and quotes exorbitant time estimates to perform such 'silly' refactorings. I guess we could leave it alone, but it's really annoying to have to type out his name every time we reference something he made. Any recommendations on how to approach this problem? Edit: Our contract with him states that we "own" everything he makes for us.

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• fast algorithm implementation to sort very small set

  - by aaa

  hello. This is the problem I ran into long time ago. I thought I may ask your for your ideas. assume I have very small set of numbers (integers), 4 or 8 elements, that need to be sorted, fast. what would be the best approach/algorithm? my approach was to use the max/min functions. I guess my question pertains more to implementation, rather than type of algorithm. At this point it becomes somewhat hardware dependent , so let us assume Intel 64-bit processor with SSE3 . Thanks

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• Seemingly useless debugging environment for Android

  - by mikeY

  I've just started debugging my first three line long android app and I can't seem to use the debug tool like I want to. Here's my code: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); int a = 1 / 0; } Now I expect the debugger to halt the thread and show me the line number of statement where the division by zero occurs. No, instead it shows some other method internal to the system for which I have no source. To make the matters worse, there is no exception message either. Prior to this app, I created one which would do something when a button was pressed. If any exception was raised, again no useful line number or exception message would be shown. As of right now, there is no way to debug my app. Any ideas? I'm using the latest SDK along with Eclipse ADT plugin and debugging on a real device (Nexus One).

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• RubyQt Crashing on QTableWidget

  - by gja

  I'm getting some weirdness with QtRuby when using a TableWidget. The table widget loads, but when you click on the elements in the row, the app segfaults and crashes. require 'Qt4' class SimpleModel < Qt::AbstractTableModel def rowCount(parent) return 1 end def columnCount(parent) return 1 end def data(index, role=Qt::DisplayRole) return Qt::Variant.new("Really Long String") if index.row == 0 and index.column == 0 and role == Qt::DisplayRole return Qt::Variant.new end end Qt::Application.new(ARGV) do Qt::TableWidget.new(1, 1) do set_model SimpleModel.new show end exec end The backtrace seems to imply that it is bombing in mousePressEvent #6 0x01624643 in QAbstractItemView::pressed(QModelIndex const&) () from /usr/lib/libQtGui.so.4 #7 0x016306f5 in QAbstractItemView::mousePressEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4 If I override mousePressEvent and mouseMoveEvent, these kinds of crashes no longer happen. Am I doing something wrong over here, or can I chalk this up as a bug in QtRuby? I'm on fedora11, with the following packages installed: QtRuby-4.4.0-1.fc11.i586 ruby-1.8.6.369-1.fc11.i586 These crashes also happen when running the script on Windows.

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• Android: Context menu doesn't show up for ListView with members defined by LinearLayout?

  - by RandomEngy

  I've got a ListActivity and ListView and I've bound some data to it. The data shows up fine, and I've also registered a context menu for the view. When I display the list items as just a simple TextView, it works fine: <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/nametext" android:layout_width="wrap_content" android:layout_height="wrap_content"/> However when I try something a bit more complex, like show the name and a CheckBox, the menu never shows up: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/nametext" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <CheckBox android:id="@+id/namecheckbox" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> Can long-presses work on more complex elements? I'm building on 2.1.

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• ASP.NET State Error

  - by Sayem Ahmed

  I am have an asp.net page, where a list of products is shown in a drop down. When a user selects an item, corresponding price, available quantity etc. are shown in the corresponding text boxes. I have used ajax update panel to retrieve these information. This approach seems to work nicely. But sometimes when a product is selected, it takes too long for the price, quantities to change, and sometimes they don't even change. Then I used firebug to see what happened to the ajax request, and I found out that the response that is coming from the server is something like this - 70|error|500|The state information is invalid for this page and might be corrupted.| I have absolutely no idea what is wrong here.............

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• organize using directives, re-run tests?

  - by Sarah Vessels

  Before making a commit, I prefer to run all hundred-something unit tests in my C# Solution, since they only take a couple minutes to run. However, if I've already run them all, all is well, and then I decide to organize the using directives in my Solution, is it really necessary to re-run the unit tests? I have a macro that goes through all files in the Solution and runs Visual Studio's 'Remove and Sort' command on each. In my understanding, so long as all projects still build after using directives are changed around, things should be fine at runtime, too. Is this correct thinking?

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• VBA Excel 2007 macro dies in Excel 2002

  - by Rob A

  Hi, I have just tried to send a workbook to a friend that has a chart with a drop-down box on it. In excel 2007 I have used: If Chart2.Shapes(2).ControlFormat.ListCount = "16" Then To check the size of the list so that it doesnt get entered in again (resulting in an extremely long list that repeats itself). This line works well in Excel 2007, but gives a Object doesn't support this property or method. error in Excel 2002. What is the difference between working with shapes in 2002 vs 2007?

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• How to manage the default Java SwingWorker thread pool?

  - by Guy Lancaster

  I've got an application that uses 2 long-running SwingWorker tasks and I've just encountered a couple of Windows computers with updated JVMs that only start one of the them. There are no errors indicated so I have to assume that the default thread pool has only a single thread and therefore the second SwingWorker object is getting queued when I try to execute it. So, (1) how do I check check how many threads are available in the default SwingWorker thread pool, and (2) how do I add threads if I'm going to need more? Anything else that I should know? This apparent single-thread thread-pool situation goes against all of my expectations. I'm setting up a ThreadPoolExecutor but this seems so wrong...

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• fastest (low latency) method for Inter Process Communication between Java and C/C++

  - by Bastien

  Hello, I have a Java app, connecting through TCP socket to a "server" developed in C/C++. both app & server are running on the same machine, a Solaris box (but we're considering migrating to Linux eventually). type of data exchanged is simple messages (login, login ACK, then client asks for something, server replies). each message is around 300 bytes long. Currently we're using Sockets, and all is OK, however I'm looking for a faster way to exchange data (lower latency), using IPC methods. I've been researching the net and came up with references to the following technologies: - shared memory - pipes - queues but I couldn't find proper analysis of their respective performances, neither how to implement them in both JAVA and C/C++ (so that they can talk to each other), except maybe pipes that I could imagine how to do. can anyone comment about performances & feasibility of each method in this context ? any pointer / link to useful implementation information ? thanks for your help

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• How to put a newline into a column header in an xtable in R

  - by PaulHurleyuk

  I have a dataframe that I am putting into a sweave document using xtable, however one of my column names is quite long, and I would like to break it over two lines to save space calqc_table<-structure(list(RUNID = c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), ANALYTEINDEX = c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), ID = structure(1:11, .Label = c("Cal A", "Cal B", "Cal C", "Cal D", "Cal E", "Cal F", "Cal G", "Cal H", "Cal High", "Cal Low", "Cal Mid"), class = "factor"), mean_conc = c(200.619459644855, 158.264703128903, 102.469121407733, 50.3551544728544, 9.88296440865076, 4.41727762501703, 2.53494715706024, 1.00602831741361, 199.065054555735, 2.48063347296935, 50.1499780776199), sd_conc = c(2.3275711264554, NA, NA, NA, NA, NA, NA, 0.101636943231162, 0, 0, 0), nrow = c(3, 1, 1, 1, 1, 1, 1, 3, 2, 2, 2)), .Names = c("Identifier of the Run within the Study", "ANALYTEINDEX", "ID", "mean_conc", "sd_conc", "nrow"), row.names = c(NA, -11L ), class = "data.frame") calqc_xtable<-xtable(calqc_table) I have tried putting a newline into the name, but this didn't seem to work names(calqc_table)[1]<-"Identifier of the \nRun within the Study" Is there a way to do this ? I have seen someone suggest using the latex function from the hmisc package to manually iterate over the table and write it out in latex manually, including the newline, but this seems like a bit of a faf !

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• A regex to match a comma that isn't surrounded by quotes.

  - by Rayne

  I'm using Clojure, so this is in the context of Java regexes. Here is an example string: "{:a "ab,cd, efg", :b "ab,def, egf,", :c "Conjecture"}" The important bits are the commas after each string. I'd like to be able to replace them with newline characters with Java's replaceAll method. A regex that will match any comma that is not surrounded by quotes will do. If I'm not coming across well, please ask and I'll be happily to clarify anything. edit: sorry for the confusion in the title. I haven't been awake very long. String: {:a "ab, cd efg",} <-- In this example, the comma at the end would be matched, but the ones inside the quote would not.

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• javascript return function's data as a file

  - by Dennis

  I have a function in javascript called "dumpData" which I call from a button on an html page as **onlick="dumpData(dbControl);"* What it does is return an xml file of the settings (to an alert box right now). I want to return it to the user as a file download. Is there a way to create a button when click will open a file download box and ask the user to save or open it? (sorta of like right-clicking and save target as)... Or can it be sent to a php file and use export();? Not sure how I would send a long string like that to php and have it simple send it back as a file download. Dennis

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• Using a FormattedText object, how do I find out how much of my text was actually displayed?

  - by Robert

  If I have code like this: FormattedText text = new FormattedText(sTheBook, System.Globalization.CultureInfo.CurrentUICulture, System.Windows.FlowDirection.LeftToRight, new Typeface("Times New Roman"), 13, Brushes.Black); text.MaxTextWidth = 300; text.MaxTextHeight = 600; text.TextAlignment = TextAlignment.Justify; dc.DrawText(text, new Point(10, 0)); ...then, if it is long, only some of the text that I passed in (via sTheBook) will be displayed on the screen. I need to know how much was displayed so I can display the rest later! I can easily measure an amount of text, but it seems silly to do a search by rendering and re-rendering my text over and over until I find the piece that fits exactly. Thanks!

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• Oracle SQLPlus: How to display the output of a sqlplus command without having to first issue the spo

  - by ziggy

  Is there a way to display the output of a sqlplus command without having to first issue the spool off command? I am spooling the results of a sqlplus session to a file while at the same time tailing the file. The reason for this is that for table with very long rows the format is easier to look at from a file. The problem is to see the output i have to issue the spool off command everytime i run a command in sqlplus. Can i configure sqlplus so that after i have issued the spool command all the output is viewable straight away on the file. (Formating the way the rows are displayed on the screen is not an option. ) THanks

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• How do I create an instance of this class in Android?

  - by Lloyd Banks

  I was wondering if it is possible to create an instance of this class (from the link, which creates a listview) from another class so that I can call on either lazyadapter.java or customizedlistview.java (not sure which one) to inflate that same listview. Is this possible? This is what I tried (obviously incorrect): CustomizedListView clv = new CustomizedListView(); clv.onCreate(...); source: http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/ LazyAdapter.java import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class LazyAdapter extends BaseAdapter { private Activity activity; private ArrayList&lt;HashMap&lt;String, String&gt;&gt; data; private static LayoutInflater inflater=null; public ImageLoader imageLoader; public LazyAdapter(Activity a, ArrayList&lt;HashMap&lt;String, String&gt;&gt; d) { activity = a; data=d; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); imageLoader=new ImageLoader(activity.getApplicationContext()); } public int getCount() { return data.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { View vi=convertView; if(convertView==null) vi = inflater.inflate(R.layout.list_row, null); TextView title = (TextView)vi.findViewById(R.id.title); // title TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name TextView duration = (TextView)vi.findViewById(R.id.duration); // duration ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image HashMap&lt;String, String&gt; song = new HashMap&lt;String, String&gt;(); song = data.get(position); // Setting all values in listview title.setText(song.get(CustomizedListView.KEY_TITLE)); artist.setText(song.get(CustomizedListView.KEY_ARTIST)); duration.setText(song.get(CustomizedListView.KEY_DURATION)); imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image); return vi; } } CustomizedListView.java import java.util.ArrayList; import java.util.HashMap; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; public class CustomizedListView extends Activity { // All static variables static final String URL = "http://api.androidhive.info/music/music.xml"; // XML node keys static final String KEY_SONG = "song"; // parent node static final String KEY_ID = "id"; static final String KEY_TITLE = "title"; static final String KEY_ARTIST = "artist"; static final String KEY_DURATION = "duration"; static final String KEY_THUMB_URL = "thumb_url"; ListView list; LazyAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;HashMap&lt;String, String&gt;&gt; songsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(URL); // getting XML from URL Document doc = parser.getDomElement(xml); // getting DOM element NodeList nl = doc.getElementsByTagName(KEY_SONG); // looping through all song nodes &lt;song&gt; for (int i = 0; i &lt; nl.getLength(); i++) { // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); Element e = (Element) nl.item(i); // adding each child node to HashMap key =&gt; value map.put(KEY_ID, parser.getValue(e, KEY_ID)); map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE)); map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST)); map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION)); map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL)); // adding HashList to ArrayList songsList.add(map); } list=(ListView)findViewById(R.id.list); // Getting adapter by passing xml data ArrayList adapter=new LazyAdapter(this, songsList); list.setAdapter(adapter); // Click event for single list row list.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { } }); } }

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• NServiceBus pipeline with Distributors

  - by David

  I'm building a processing pipeline with NServiceBus but I'm having trouble with the configuration of the distributors in order to make each step in the process scalable. Here's some info: The pipeline will have a master process that says "OK, time to start" for a WorkItem, which will then start a process like a flowchart. Each step in the flowchart may be computationally expensive, so I want the ability to scale out each step. This tells me that each step needs a Distributor. I want to be able to hook additional activities onto events later. This tells me I need to Publish() messages when it is done, not Send() them. A process may need to branch based on a condition. This tells me that a process must be able to publish more than one type of message. A process may need to join forks. I imagine I should use Sagas for this. Hopefully these assumptions are good otherwise I'm in more trouble than I thought. For the sake of simplicity, let's forget about forking or joining and consider a simple pipeline, with Step A followed by Step B, and ending with Step C. Each step gets its own distributor and can have many nodes processing messages. NodeA workers contain a IHandleMessages processor, and publish EventA NodeB workers contain a IHandleMessages processor, and publish Event B NodeC workers contain a IHandleMessages processor, and then the pipeline is complete. Here are the relevant parts of the config files, where # denotes the number of the worker, (i.e. there are input queues NodeA.1 and NodeA.2): NodeA: <MsmqTransportConfig InputQueue="NodeA.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeA.Distrib.Control" DistributorDataAddress="NodeA.Distrib.Data" > <MessageEndpointMappings> </MessageEndpointMappings> </UnicastBusConfig> NodeB: <MsmqTransportConfig InputQueue="NodeB.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeB.Distrib.Control" DistributorDataAddress="NodeB.Distrib.Data" > <MessageEndpointMappings> <add Messages="Messages.EventA, Messages" Endpoint="NodeA.Distrib.Data" /> </MessageEndpointMappings> </UnicastBusConfig> NodeC: <MsmqTransportConfig InputQueue="NodeC.#" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" /> <UnicastBusConfig DistributorControlAddress="NodeC.Distrib.Control" DistributorDataAddress="NodeC.Distrib.Data" > <MessageEndpointMappings> <add Messages="Messages.EventB, Messages" Endpoint="NodeB.Distrib.Data" /> </MessageEndpointMappings> </UnicastBusConfig> And here are the relevant parts of the distributor configs: Distributor A: <add key="DataInputQueue" value="NodeA.Distrib.Data"/> <add key="ControlInputQueue" value="NodeA.Distrib.Control"/> <add key="StorageQueue" value="NodeA.Distrib.Storage"/> Distributor B: <add key="DataInputQueue" value="NodeB.Distrib.Data"/> <add key="ControlInputQueue" value="NodeB.Distrib.Control"/> <add key="StorageQueue" value="NodeB.Distrib.Storage"/> Distributor C: <add key="DataInputQueue" value="NodeC.Distrib.Data"/> <add key="ControlInputQueue" value="NodeC.Distrib.Control"/> <add key="StorageQueue" value="NodeC.Distrib.Storage"/> I'm testing using 2 instances of each node, and the problem seems to come up in the middle at Node B. There are basically 2 things that might happen: Both instances of Node B report that it is subscribing to EventA, and also that NodeC.Distrib.Data@MYCOMPUTER is subscribing to the EventB that Node B publishes. In this case, everything works great. Both instances of Node B report that it is subscribing to EventA, however, one worker says NodeC.Distrib.Data@MYCOMPUTER is subscribing TWICE, while the other worker does not mention it. In the second case, which seem to be controlled only by the way the distributor routes the subscription messages, if the "overachiever" node processes an EventA, all is well. If the "underachiever" processes EventA, then the publish of EventB has no subscribers and the workflow dies. So, my questions: Is this kind of setup possible? Is the configuration correct? It's hard to find any examples of configuration with distributors beyond a simple one-level publisher/2-worker setup. Would it make more sense to have one central broker process that does all the non-computationally-intensive traffic cop operations, and only sends messages to processes behind distributors when the task is long-running and must be load balanced? Then the load-balanced nodes could simply reply back to the central broker, which seems easier. On the other hand, that seems at odds with the decentralization that is NServiceBus's strength. And if this is the answer, and the long running process's done event is a reply, how do you keep the Publish that enables later extensibility on published events?

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• Broken pipe error in rails with memcached

  - by abronte

  I keep running into this error MemCacheError (Broken pipe): Broken pipe on my Rails app and I can't figure out why. When I access memcached via Rails.cache in my controller, the first 1 or 2 read/writes always seems to throw the broken pipe error. But when I access memcached by creating a new object, ActiveSupport::Cache::MemCacheStore.new, I don't seem to get this error. I also access memcached in another ruby process, and the first read always has this error regardless of the way I access memcached. I did implement a work around just by retrying the read but id rather have a better long term solution. Currently the only time I see this problem is after I restart memcached. I'm using Rails 2.3.5 and memcached 1.4.4 (I've also tried this with memcached 1.2.2).

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• Which C# / .NET free or standard bits and pieces do I need to make a simple Windows desktop app back

  - by jjujuma

  I'm coming from a Java / web background with no C# experience and I want to write a prototype C# / .NET desktop app to run against my existing DB2 database. The idea is that the prototype should use libraries and tools which are suitable for scaling up to full production and should be standard and free. Of the top of my head, the two biggest things I need are: an IDE a GUI toolkit / set of components a JDBC equivalent and/or possibly a full blown ORM system What are my options? Note I don't mind paying for full blown Visual Studio in the long run, but for now everything needs to be free, including the IDE.

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• Java JDK Source Code?? Where to find it?

  - by Martijn Courteaux

  Hi, I like to see what a method in the Java API does. So I want the JDK Source Code. Before I re-installed Linux I had the scr.sip file with all the code in it. I just had to tell Eclipse this file and I could see the code. But now I haven't the file anymore... So the question is: Where can I find it? Please don't paste the Google results here. I searched already long, but I can't find it... I need just that file. Please be sure if it is the correct file before you answer. Answering by giving an URL is enough for me. Thanks in advance Martijn

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• HTML Table <thead> Position Fixed

  - by Bry4n

  Variations of this question have been answered, but none of which dealing with my issue. I don't know if this can be achieved or not but I thought if anyone knew they would know on here. I have a table with a thead and one row with many columns. I want the thead to remain fixed (the row is extremely long) however when the thead is fixed, it gets cut off at the end of the browser. Is there a way I can keep it fixed but when you scroll horozontally for the entire page you can see the rest of the thead?

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• The second argument to copy() function cannot be a directory

  - by Jorm

  Anyone know why this: $title = trim($_POST['title']); $description = trim($_POST['description']); // Array of allowed image file formats $allowedExtensions = array('jpeg', 'jpg', 'jfif', 'png', 'gif', 'bmp'); foreach ($_FILES as $file) { if ($file['tmp_name'] > '') { if (!in_array(end(explode(".", strtolower($file['name']))), $allowedExtensions)) { echo '<div class="error">Invalid file type.</div>'; } } } if (strlen($title) < 3) echo '<div class="error">Too short title</div>'; else if (strlen($description) > 70) echo '<div class="error">Too long desccription.</div>'; else { move_uploaded_file($_FILES['userfile']['tmp_name'], 'c:\wamp\www\uploads\images/'); } Gives: Warning: move_uploaded_file() [function.move-uploaded-file]: The second argument to copy() function cannot be a directory in C:\wamp\www\upload.php on line 41 Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move 'C:\wamp\tmp\php1AB.tmp' to 'c:\wamp\www\uploads\images/' in C:\wamp\www\upload.php on line 41

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• VCL/Delphi/BCB - which IDE/language should I use?

  - by mawg

  I bought Delphi 1 when it came out - and was hooked. When BCB came out (around D3, iirc), I switched, mainly because I have used C/C++ professionally for a few decades. I have "been away" for 7 or 8 years and am now returning. I still have BCB 6 & Delphi 7 (not to mention Kylix). I always felt more comfortable with C++ than Pascal - purely because of work-day familiarity. But, realistically, iirc, most 3rd party VCL components are coded in Delphi/Pascal. And I think I used to have problems debugging Delphi components from BCB, but I could well remember wrongly. Anyhoo, now I am back and intend to use VCL components / hack the code of same / debug them & code a few of my own. Given that I am slightly more comfortable with C++, is there any compelling reason to choose Delphi over BCB, or is this just a case of how long my particular piece of string is?

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• Gson Deserialize to Java Tree

  - by MountainX

  I need to deserialize some JSON to a Java tree structure that contains TreeNodes and NodeData. TreeNodes are thin wrappers around NodeData. I'll provide the JSON and the classes below. I have looked at the usual Gson help sources, including here, but I can't seem to come up with the solution. Serialization works fine with Gson. The JSON below was produced by Gson. But deserialization is the problem I need help with. Can someone show me how to write the deserializer (or suggest an alternative approach using Gson best practices)? Here is my JSON. The "data" element corresponds to class NodeData, and the "subList" JSON element corresponds to Java class TreeNode. { "data": { "version": "032", "name": "root", "path": "/", "id": "1", "parentId": "0", "toolTipText": "rootNode" }, "subList": [ { "data": { "version": "032", "name": "level1", "labelText": "Some Label Text at Level1", "path": "/root", "id": "2", "parentId": "1", "toolTipText": "a tool tip for level1" }, "subList": [ { "data": { "version": "032", "name": "level1_1", "labelText": "Label level1_1", "path": "/root/level1", "id": "3", "parentId": "2", "toolTipText": "ToolTipText for level1_1" } }, { "data": { "version": "032", "name": "level1_2", "labelText": "Label level1_2", "path": "/root/level1", "id": "4", "parentId": "2", "toolTipText": "ToolTipText for level1_2" } } ] }, { "data": { "version": "032", "name": "level2", "path": "/root", "id": "5", "parentId": "1", "toolTipText": "ToolTipText for level2" }, "subList": [ { "data": { "version": "032", "name": "level2_1", "labelText": "Label level2_1", "path": "/root/level2", "id": "6", "parentId": "5", "toolTipText": "ToolTipText for level2_1" }, "subList": [ { "data": { "version": "032", "name": "level2_1_1", "labelText": "Label level2_1_1", "path": "/root/level2/level2_1", "id": "7", "parentId": "6", "toolTipText": "ToolTipText for level2_1_1" } } ] } ] } ] } Here are the Java classes: public class Tree { private TreeNode rootElement; private HashMap<String, TreeNode> indexById; private HashMap<String, TreeNode> indexByKey; private long nextAvailableID = 0; public Tree() { indexById = new HashMap<String, TreeNode>(); indexByKey = new HashMap<String, TreeNode>(); } public long getNextAvailableID() { return this.nextAvailableID; } ... [snip] ... } public class TreeNode { private Tree tree; private NodeData data; public List<TreeNode> subList; private HashMap<String, TreeNode> indexById; private HashMap<String, TreeNode> indexByKey; //this default ctor is used only for Gson deserialization public TreeNode() { this.tree = new Tree(); indexById = tree.getIdIndex(); indexByKey = tree.getKeyIndex(); this.makeRoot(); tree.setRootElement(this); } //makes this node the root node. Calling this obviously has side effects. public NodeData makeRoot() { NodeData rootProp = new NodeData(TreeFactory.version, "example", "rootNode"); String nextAvailableID = getNextAvailableID(); if (!nextAvailableID.equals("1")) { throw new IllegalStateException(); } rootProp.setId(nextAvailableID); rootProp.setParentId("0"); rootProp.setKeyPathOnly("/"); rootProp.setSchema(tree); this.data = rootProp; rootProp.setNode(this); indexById.put(rootProp.getId(), this); indexByKey.put(rootProp.getKeyFullName(), this); return rootProp; } ... [snip] ... } public class NodeData { protected static Tree tree; private LinkedHashMap<String, String> keyValMap; protected String version; protected String name; protected String labelText; protected String path; protected String id; protected String parentId; protected TreeNode node; protected String toolTipText;//tool tip or help string protected String imagePath;//for things like images; not persisted to properties protected static final String delimiter = "/"; //this default ctor is used only for Gson deserialization public NodeData() { this("NOT_SET", "NOT_SET", "NOT_SET"); } ... [snip] ... } Side note: The tree data structure is a bit strange, as it includes indexes. Obviously, this isn't a typical search tree. In fact, the tree is used mainly to create a hierarchical path element (String) in each NodeData element. (Example: "path": "/root/level2/level2_1".) The indexes are actually used for NodeData retrieval.

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