I am currently writing an (simple) analytisis code to sum time connected powerreadings. With the data being assumingly raw (e.g. disturbances from the measuring device have not been calculated out) I have to account for disturbances by calculation the mean of the first one thousand samples. The calculation of the mean itself is not a problem. I only am unsure of how to generate the appropriate DataSet.
For now it looks about like this:
DataSet<Tupel2<long,double>>Gyrotron_1=ECRH.includeFields('11000000000'); // obviously the line to declare the first gyrotron, continues for the next ten lines, assuming separattion of not occupied space
DataSet<Tupel2<long,double>>Gyrotron_2=ECRH.includeFields('10100000000');
DataSet<Tupel2<long,double>>Gyrotron_3=ECRH.includeFields('10010000000');
DataSet<Tupel2<long,double>>Gyrotron_4=ECRH.includeFields('10001000000');
DataSet<Tupel2<long,double>>Gyrotron_5=ECRH.includeFields('10000100000');
DataSet<Tupel2<long,double>>Gyrotron_6=ECRH.includeFields('10000010000');
DataSet<Tupel2<long,double>>Gyrotron_7=ECRH.includeFields('10000001000');
DataSet<Tupel2<long,double>>Gyrotron_8=ECRH.includeFields('10000000100');
DataSet<Tupel2<long,double>>Gyrotron_9=ECRH.includeFields('10000000010');
DataSet<Tupel2<long,double>>Gyrotron_10=ECRH.includeFields('10000000001');
for (int=1,i<=10;i++) {
DataSet<double> offset=Gyroton_'+i+'.groupBy(1).first(1000).sum()/1000;
}
It's the part in the for-loop I'm unsure of. Does anybody know if it is possible to append values to DataSets and if so how?
In case of doubt, I could always put the values into an array but I do not know if that is the wise thing to do.
This code will not work for many reasons. I'd recommend looking into the fundamentals of Java and the basic data structures and also in Flink.
It's really hard to understand what you actually try to achieve but this is the closest that I came up with
String[] codes = { "11000000000", ..., "10000000001" };
DataSet<Tuple2<Long, Double>> result = env.fromElements();
for (final String code : codes) {
DataSet<Tuple2<Long, Double>> codeResult = ECRH.includeFields(code)
.groupBy(1)
.first(1000)
.sum(0)
.map(sum -> new Tuple2<>(sum.f0, sum.f1 / 1000d));
result = codeResult.union(result);
}
result.print();
But please take the time and understand the basics before delving deeper. I also recommend to use an IDE like IntelliJ that would point to at least 6 issues in your code.
I am used to being able to perform a binary search of a sorted list of, say, Strings or Integers, with code along the lines of:
Vector<String> vstr = new Vector<String>();
// etc...
int index = Collections.binarySearch (vstr, "abcd");
I'm not clear on how codenameone handles standard java methods and classes, but it looks like this could be fixed easily if classes like Integer and String (or the codenameone versions of these) implemented the Comparable interface.
Edit: I now see that code along the lines of the following will do the job.
int index = Collections.binarySearch(vstr, "abcd", new Comparator<String>() {
#Override
public int compare(String object1, String object2) {
return object1.compareTo(object2);
}
});
Adding the Comparable interface (to the various primitive "wrappers") would also would also make it easier to use Collections.sort (another very useful method :-))
You can also sort with a comparator but I agree, this is one of the important enhancements we need to provide in the native VM's on the various platforms personally this is my biggest peeve in our current VM.
Can you file an RFE on that and mention it as a comment in the Number issue?
If we are doing that change might as well do both.
How can I customize the completion of a GtkComboBoxText with both a "static" aspect and a "dynamic" one? The static aspect is because some entries are known and added to the combo-box-text at construction time with gtk_combo_box_text_append_text. The dynamic aspect is because I also need to complete thru some callback function(s), that is to complete dynamically -after creation of the GtkComboBoxText widget- once several characters has been typed.
My application uses Boehm's GC (except for GTK objects of course) like Guile or SCM or Bigloo are doing. It can be seen as an experimental persistent dynamic-typed programming language implementation with an integrated editor coded on and for Debian/Linux/x86-64 with the system GTK3.21 library, it is coded in C99 (some of which is generated) and is compiled with GCC6.
(I don't care about non-Linux systems, GTK3 libraries older than GTK3.20, GCC compiler older that GCC6)
question details
I'm entering (inputting into the GtkComboBoxText) either a name, or an object-id.
The name is C-identifier-like but starts with a letter and cannot end with an underscore. For example, comment, if, the_GUI, the_system, payload_json, or x1 are valid names (but _a0bcd or foobar_ are invalid names, because they start or end with an underscore). I currently have a big dozen of names, but I could have a few thousands of them. So it would be reasonable to offer a completion once only a single or perhaps two letters has been typed, and completion for names can happen statically because they are not many of them (so I feel reasonable to call gtk_combo_box_append_text for each name).
The object-id starts with an underscore followed by a digit and has exactly 18 alphanumeric (sort-of random) characters. For example, _5Hf0fFKvRVa71ZPM0, _8261sbF1f9ohzu2Iu, _0BV96V94PJIn9si1K are possible object-ids. Actually it is 96 almost random bits (probably only 294 are possible). The object-id plays the role of UUIDs (in the sense that it is assumed to be world-wide unique for distinct objects) but has a C friendly syntax. I currently have a few dozen of objects-ids, but I could have a few hundred of thousands (or maybe a million) of them. But given a prefix of four characters like _6S3 or _22z, I am assuming that only a reasonable number (probably at most a dozen, and surely no more than a thousand) object-ids exist in my application with that prefix. Of course it would be unreasonable to register (statically) a priori all the object ids (the completion has to happen after four characters have been typed, and should happen dynamically).
So I want a completion that works both on names (e.g. typing one letter perhaps followed by another alphanum character should be enough to propose a completion of at most a hundred choices), and on object-ids (typing four characters like _826 should be enough to trigger a completion of probably at most a few dozen choices, perhaps a thousand ones if unlucky).
Hence typing the three keys p a tab would offer completion with a few names like payload_json or payload_vectval etc... and typing the five keys _ 5 H f tab would offer completion with very few object-ids, notably _5Hf0fFKvRVa71ZPM0
sample incomplete code
So far I coded the following:
static GtkWidget *
mom_objectentry (void)
{
GtkWidget *obent = gtk_combo_box_text_new_with_entry ();
gtk_widget_set_size_request (obent, 30, 10);
mo_value_t namsetv = mo_named_objects_set ();
I have Boehm-garbage-collected values, and mo_value_t is a pointer to any of them. Values can be tagged integers, pointers to strings, objects, or tuples or sets of objects. So namesetv now contains the set of named objects (probably less than a few thousand of named objects).
int nbnam = mo_set_size (namsetv);
MOM_ASSERTPRINTF (nbnam > 0, "bad nbnam");
mo_value_t *namarr = mom_gc_alloc (nbnam * sizeof (mo_value_t));
int cntnam = 0;
for (int ix = 0; ix < nbnam; ix++)
{
mo_objref_t curobr = mo_set_nth (namsetv, ix);
mo_value_t curnamv = mo_objref_namev (curobr);
if (mo_dyncast_string (curnamv))
namarr[cntnam++] = curnamv;
}
qsort (namarr, cntnam, sizeof (mo_value_t), mom_obname_cmp);
for (int ix = 0; ix < cntnam; ix++)
gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (obent),
mo_string_cstr (namarr[ix]));
at this point I have sorted all the (few thousands at most) names and added "statically" them using gtk_combo_box_text_append_text.
GtkWidget *combtextent = gtk_bin_get_child (GTK_BIN (obent));
MOM_ASSERTPRINTF (GTK_IS_ENTRY (combtextent), "bad combtextent");
MOM_ASSERTPRINTF (gtk_entry_get_completion (GTK_ENTRY (combtextent)) ==
NULL, "got completion in combtextent");
I noticed with a bit of surprise that gtk_entry_get_completion (GTK_ENTRY (combtextent)) is null.
But I am stuck here. I am thinking of:
Having some mom_set_complete_objectid(const char*prefix) which given a prefix like "_47n" of at least four characters would return a garbage collected mo_value_t representing the set of objects with that prefix. This is very easy to code for me, and is nearly done.
Make my own local GtkEntryCompletion* mycompl = ..., which would complete like I want. Then I would put it in the text entry combtextent of my gtk-combo-box-text using gtk_entry_set_completion(GTK_ENTRY(combtextent), mycompl);
Should it use the entries added with gtk_combo_box_text_append_text for the "static" name completion role? How should I dynamically complete using the dynamic set value returned from my mom_set_complete_objectid; given some object-pointer obr and some char bufid[20]; I am easily and quickly able to fill it with the object-id of that object obr with mo_cstring_from_hi_lo_ids(bufid, obr->mo_ob_hid, obr->mo_ob_loid)..
I don't know how to code the above. For reference, I am now just returning the combo-box-text:
// if the entered text starts with a letter, I want it to be
// completed with the appended text above if the entered text starts
// with an undersore, then a digit, then two alphanum (like _0BV or
// _6S3 for example), I want to call a completion function.
#warning objectentry: what should I code here?
return obent;
} /* end mom_objectentry */
Is my approach the right one?
The mom_objectentry function above is used to fill modal dialogs with short lifetime.
I am favoring simple code over efficiency. Actually, my code is temporary (I'm hoping to bootstrap my language, and generate all its C code!) and in practice I'll probably have only a few hundred names and at most a few dozen of thousands of object-ids. So performance is not very important, but simplicity of coding (some conceptually "throw away" code) is more important.
I don't want (if possible) to add my own GTK classes. I prefer using existing GTK classes and widgets, customizing them with GTK signals and callbacks.
context
My application is an experimental persistent programming language and implementation with a near Scheme or Python (or JavaScript, ignoring the prototype aspect, ...) semantics but with a widely different (not yet implemented in september 7th, 2016) syntax (to be shown & input in GTK widgets), using the Boehm garbage collector for values (including objects, sets, tuples, strings...)... Values (including objects) are generally persistent (except the GTK related data : the application starts with a nearly empty window). The entire language heap is persisted in JSON-like syntax in some Sqlite "database" (generated at application exit) dumped into _momstate.sql which is re-loaded at application startup. Object-ids are useful to show object references to the user in GTK widgets, for persistence, and to generate C code related to the objects (e.g. the object of id _76f7e2VcL8IJC1hq6 could be related to a mo_76f7e2VcL8IJC1hq6 identifier in some generated C code; this is partly why I have my object-id format instead of using UUIDs).
PS. My C code is GPLv3 free software and available on github. It is the MELT monitor, branch expjs, commit e2b3b99ef66394...
NB: The objects mentioned here are implicitly my language objects, not GTK objects. The all have a unique object-id, and some but not most of them are named.
I will not show exact code on how to do it because I never did GTK & C only GTK & Python, but it should be fine as the functions in C and Python functions can easily be translated.
OP's approach is actually the right one, so I will try to fill in the gaps. As the amount of static options is limited probably won't change to much it indeed makes sense to add them using gtk_combo_box_text_append which will add them to the internal model of the GtkComboBoxText.
Thats covers the static part, for the dynamic part it would be perfect if we could just store this static model and replace it with a temporay model using gtk_combo_box_set_model() when a _ was found at the start of the string. But we shouldn't do this as the documentation says:
You should not call gtk_combo_box_set_model() or attempt to pack more cells into this combo box via its GtkCellLayout interface.
So we need to work around this, one way of doing this is by adding a GtkEntryCompletion to the entry of the GtkComboBoxText. This will make the entry attempt to complete the current string based on its current model. As an added bonus it can also add all the character all options have in common like this:
As we don't want to load all the dynamic options before hand I think the best approach will be to connect a changed listener to the GtkEntry, this way we can load the dynamic options when we have a underscore and some characters.
As the GtkEntryCompletion uses a GtkListStore internally, we can reuse part of the code Nominal Animal provided in his answer. The main difference being: the connect is done on the GtkEntry and the replacing of GtkComboText with GtkEntryCompletion inside the populator. Then everything should be fine, I wish I would be able to write decent C then I would have provided you with code but this will have to do.
Edit: A small demo in Python with GTK3
import gi
gi.require_version('Gtk', '3.0')
import gi.repository.Gtk as Gtk
class CompletingComboBoxText(Gtk.ComboBoxText):
def __init__(self, static_options, populator, **kwargs):
# Set up the ComboBox with the Entry
Gtk.ComboBoxText.__init__(self, has_entry=True, **kwargs)
# Store the populator reference in the object
self.populator = populator
# Create the completion
completion = Gtk.EntryCompletion(inline_completion=True)
# Specify that we want to use the first col of the model for completion
completion.set_text_column(0)
completion.set_minimum_key_length(2)
# Set the completion model to the combobox model such that we can also autocomplete these options
self.static_options_model = self.get_model()
completion.set_model(self.static_options_model)
# The child of the combobox is the entry if 'has_entry' was set to True
entry = self.get_child()
entry.set_completion(completion)
# Set the active option of the combobox to 0 (which is an empty field)
self.set_active(0)
# Fill the model with the static options (could also be used for a history or something)
for option in static_options:
self.append_text(option)
# Connect a listener to adjust the model when the user types something
entry.connect("changed", self.update_completion, True)
def update_completion(self, entry, editable):
# Get the current content of the entry
text = entry.get_text()
# Get the completion which needs to be updated
completion = entry.get_completion()
if text.startswith("_") and len(text) >= completion.get_minimum_key_length():
# Fetch the options from the populator for a given text
completion_options = self.populator(text)
# Create a temporary model for the completion and fill it
dynamic_model = Gtk.ListStore.new([str])
for completion_option in completion_options:
dynamic_model.append([completion_option])
completion.set_model(dynamic_model)
else:
# Restore the default static options
completion.set_model(self.static_options_model)
def demo():
# Create the window
window = Gtk.Window()
# Add some static options
fake_static_options = [
"comment",
"if",
"the_GUI",
"the_system",
"payload_json",
"x1",
"payload_json",
"payload_vectval"
]
# Add the the Combobox
ccb = CompletingComboBoxText(fake_static_options, dynamic_option_populator)
window.add(ccb)
# Show it
window.show_all()
Gtk.main()
def dynamic_option_populator(text):
# Some fake returns for the populator
fake_dynamic_options = [
"_5Hf0fFKvRVa71ZPM0",
"_8261sbF1f9ohzu2Iu",
"_0BV96V94PJIn9si1K",
"_0BV1sbF1f9ohzu2Iu",
"_0BV0fFKvRVa71ZPM0",
"_0Hf0fF4PJIn9si1Ks",
"_6KvRVa71JIn9si1Kw",
"_5HKvRVa71Va71ZPM0",
"_8261sbF1KvRVa71ZP",
"_0BKvRVa71JIn9si1K",
"_0BV1KvRVa71ZPu2Iu",
"_0BV0fKvRVa71ZZPM0",
"_0Hf0fF4PJIbF1f9oh",
"_61sbFV0fFKn9si1Kw",
"_5Hf0fFKvRVa71ozu2",
]
# Only return those that start with the text
return [fake_dynamic_option for fake_dynamic_option in fake_dynamic_options if fake_dynamic_option.startswith(text)]
if __name__ == '__main__':
demo()
Gtk.main()
Here is my suggestion:
Use a GtkListStore to contain a list of GTK-managed strings (essentially, copies of your identifier string) that match the current prefix string.
(As documented for gtk_list_store_set(), a G_TYPE_STRING item is copied. I consider the overhead of the extra copy acceptable here; it should not affect real-world performance much anyway, I think, and in return, GTK+ will manage the reference counting for us.)
The above is implemented in a GTK+ callback function, which gets an extra pointer as payload (set at the time the GUI is created or activated; I suggest you use some structure to keep references you need to generate the matches). The callback is connected to the combobox popup signal, so that it gets called whenever the list is expanded.
Note that as B8vrede noted in a comment, a GtkComboBoxText should not be modified via its model; that is why one should/must use a GtkComboBox instead.
Practical example
For simplicity, let's assume all the data you need to find or generate all known identifiers matched against is held in a structure, say
struct generator {
/* Whatever data you need to generate prefix matches */
};
and the combo box populator helper function is then something like
static void combo_box_populator(GtkComboBox *combobox, gpointer genptr)
{
struct generator *const generator = genptr;
GtkListStore *combo_list = GTK_LIST_STORE(gtk_combo_box_get_model(combobox));
GtkWidget *entry = gtk_bin_get_child(GTK_BIN(combobox));
const char *prefix = gtk_entry_get_text(GTK_ENTRY(entry));
const size_t prefix_len = (prefix) ? strlen(prefix) : 0;
GtkTreeIter iterator;
/* Clear the current store */
gtk_list_store_clear(combo_list);
/* Initialize the list iterator */
gtk_tree_model_get_iter_first(GTK_TREE_MODEL(combo_list), &iterator);
/* Find all you want to have in the combo box;
for each const char *match, do:
*/
gtk_list_store_append(combo_list, &iterator);
gtk_list_store_set(combo_list, &iterator, 0, match, -1);
/* Note that the string pointed to by match is copied;
match is not referred to after the _set() returns.
*/
}
When the UI is built or activated, you need to ensure the GtkComboBox has an entry (so the user can write text into it), and a GtkListStore model:
struct generator *generator;
GtkWidget *combobox;
GtkListStore *combo_list;
combo_list = gtk_list_store_new(1, G_TYPE_STRING);
combobox = gtk_combo_box_new_with_model_and_entry(GTK_TREE_MODEL(combo_list));
gtk_combo_box_set_id_column(GTK_COMBO_BOX(combobox), 0);
gtk_combo_box_set_entry_text_column(GTK_COMBO_BOX(combobox), 0);
gtk_combo_box_set_button_sensitivity(GTK_COMBO_BOX(combobox), GTK_SENSITIVITY_ON);
g_signal_connect(combobox, "popup", G_CALLBACK(combo_box_populator), generator);
On my system, the default pop-up accelerator is Alt+Down, but I assume you've already changed that to Tab.
I have a crude working example here (a .tar.xz tarball, CC0): it reads lines from standard input, and lists the ones matching the user prefix in reverse order in the combo box list (when popped-up). If the entry is empty, the combobox will contain all input lines. I didn't change the default accelerators, so instead of Tab, try Alt+Down.
I also have the same example, but using GtkComboBoxText instead, here (also CC0). This does not use a GtkListStore model, but uses gtk_combo_box_text_remove_all() and gtk_combo_box_text_append_text() functions to manipulate the list contents directly. (There is just a few different lines in the two examples.) Unfortunately, the documentation is not explicit whether this interface references or copies the strings. Although copying is the only option that makes sense, and this can be verified from the current Gtk+ sources, the lack of explicit documentation makes me hesitant.
Comparing the two examples I linked to above (both grab some 500 random words from /usr/share/dict/words if you compile and run it with make), I don't see any speed difference. Both use the same naïve way of picking prefix matches from a linked list, which means the two methods (GtkComboBox + model, or GtkComboBoxText) should be about equally fast.
On my own machine, both get annoyingly slow with more than 1000 or so matches in the popup; with just a hundred or less matches, it feels instantaneous. This, to me, indicates that the slow/naïve way of picking prefix matches from a linked list is not the culprit (because the entire list is traversed in both cases), but that the GTK+ combo boxes are just not designed for large lists. (The slowdown is definitely much, much worse than linear.)
For a query simple as that
runDb . select . from $ \cell -> do
where_ $ cell ^. CellCode ==. val "x"
return cell
I want to apply a function before the comparison of the field value with "x". The reason is that the cell code has trailing spaces in the database and nothing easier than trimming them away, e.g. with strip from Data.Text. However, my initial approach of using fmap (twice) resulted in
No Instance for (Functor SqlExpr)
I know that there are functions provides by Esqueleto, like just, that accomplish similar things specifically (I couldn't find the implementation of just, though).
Is there a way to apply any function on the packed value?
While writing: in my specific case, I just might want to use like.
EDIT: Added the specific function I want to apply.
What kind of function to you want to apply?
Here is how someone added the ability to call the chr() function in a query:
https://github.com/krisajenkins/esqueleto/commit/fa1d1c888770e297fef52d76b6cb68342a6c0376
If it is a built-in function (or a user-definable function), perhaps you can do something similar.
See here for a post that adds the postgresql function trim:
import Database.Esqueleto.Internal.Sql
trim :: (IsString s) => SqlExpr (Value s) -> SqlExpr (Value s) -> SqlExpr (Value s)
trim pattern target =
unsafeSqlFunction "trim" (unsafeSqlBinOp "FROM" pattern target)
(If you're not using postgres, you may need to consult the documentation from your database to find if it supports something similar.)
unsafeSqlFunction can be used to import any function your database supports, but it is unsafe because you have the responsibility to make sure the type signature is actually what your database expects. The name will be copied literally to your SQL.
unsafeSqlBinOp is similar, but it defines a binary operation: unsafeSqlBinOp "FROM" "a" "b" is translated into the SQL "a" FROM "b".
With this, you should be able to do:
runDb . select . from $ \cell -> do
where_ $ trim " " (cell ^. CellCode) ==. val "x"
return cell
Usually AD returns 'Objectsid' as a byte[]. So I type cast the value returned by AD in to byte[]. This procedure worked against several AD but not in one case. In this AD environment, I get following exception.
Exception: Unable to cast object of type 'System.String' to type 'System.Byte[]'. (System.InvalidCastException)
To debug this I started checking data-type of the value returned by AD, and it was system.string not byte[]. I printed this string and it was garbage. Then I passed this string to SecurityIdentifier() and I got exception again.
Exception: Value was invalid. Parameter name: sddlForm (System.ArgumentException)
Code:
//Using System.DirectoryServices.Protocols objects
object s = objSrEc[k1].Attributes[(string)obj3.Current][0];
string x = s.GetType().FullName;
if (x.ToLower() == "system.byte[]")
{
byte[] bSID = ((byte[])s);
if (bSID != null)
{
SecurityIdentifier SID = new SecurityIdentifier(bSID, 0);
String ObjectSID = SID.Value;
}
}
else if (x.ToLower() == "system.string")
{
SecurityIdentifier SID = new SecurityIdentifier((String)s); //ssdl excception
String ObjectSID = SID.Value;
}
This is the first time I am seeing AD return string data for ObjectSID. I have run my code against many AD servers. I am planning to check the data-type of ObjectSID in AD schema.
Do any one come across this behavior? Should I call the Win32 api ConvertByteToStringSid()?
Thanks
Ramesh
Sorry for reviving a graveyard post, but I had the same issue a year or so ago, managed to find out why and I figured I'd at least share the reason behind this behavior.
When using the System.DirectoryServices.Protocols namespace, all attribute values should be either a) a byte array, or b) a UTF-8 string. Thing is, the developers at Microsoft figured that they should help people by returning a string when the byte array returned from the underlying LDAP API can be formatted as one, and the byte array itself when the UTF-8 conversion fails. However, this is only true for the indexer of the DirectoryAttribute class, and not for the iterator (which always returns the byte array) or the GetValues method.
The safest way to always get a byte array when you want the SID is, as previously mentioned by others, the GetValues method.
I came through the same. Found this behavior normal when deal with ForeignSecurityPrincipals, however recently found this when translate attributes of built-in groups from some old Win 2K3 domains.
I don't like this as can't just ask the result attribute to tell me via GetType() what type are you and what should I do with you ( GetValues(Attribute.GetType()) ). One of the solutions was reading all attributes definition from AD schema, but this part might be a bit heavy (depends what you're looking for) although it was only a small part of overall AD processing the solution was performing.
Cheers,
Greg