Eclipse has a feature that represents some types of Java collections (most notably ArrayList and ArrayDeque) in a simplified way in the inspect tool (also in the Variables and Expression views):
d = ArrayDeque<E> (id=33)
[0] = "somevalue" (id=57)
[1] = "someothervalue (id=59)
In most other classes, instead of the [0] and [1] entries, the inspect tool will show fields of the object, including their names. I'm interested in looking at the internals of a live ArrayDeque.
Is there a way to make the inspect tool show the real fields of the ArrayDeque, so that the output looks more like this?:
"d" = ArrayDeque<E> (id=33)
elements = Object[] (id=34)
head = 2
tail = 4
I'm using Eclipse 2018-12 (4.10.0).
EDIT: I have already tried using a subclass of ArrayDeque, but it doesn't help.
I have found a way:
In Preferences > Java > Debug > Logical Structures, there is a definiton that performs toArray() on any java.util.Collection before the inspect tool shows the result.
While it is not possible to remove that default entry, you can add an entry for a more specific type:
Qualified type name: java.util.ArrayDeque
Description: Shows ArrayDeque internals
Code: this
Related
I want to programmatically get a list of available functions in the current MATLAB namespace, as well the available functions in a package. How can this be done?
We can use package metadata for this:
pkgs = meta.package.getAllPackages();
% Or if the specific package name is known:
mp = meta.package.fromName('matlab')
The cell array returned in the 1st case, pkgs, contains objects such as this:
package with properties:
Name: 'Sldv'
Description: ''
DetailedDescription: ''
ClassList: [29×1 meta.class]
FunctionList: [8×1 meta.method]
PackageList: [9×1 meta.package]
ContainingPackage: [0×0 meta.package]
So all that's left to do is iterate through the packages and sub-packages tand collect their FunctionList entries.
I'm not sure how to get the functions that belong to the "default" namespace, other than by parsing the function list doc page, for example using the Python API and BeautifulSoup:
fl = arrayfun(#(x)string(x{1}.string.char), py.bs4.BeautifulSoup( ...
fileread(fullfile(docroot,'matlab','functionlist-alpha.html')), ...
'html.parser').find_all("code")).';
Further to Dev-iL's answer, parsing the function list documentation web page is pretty easy because of the useful "function" class that the web devs have (currently) used to tag each function name with! Each function looks like this within the HTML:
<code class="function">accumarray</code>
So we can use urlread to grab the source, and regular expressions to strip out the inner text of each "function" class item:
str = urlread('https://mathworks.com/help/matlab/functionlist-alpha.html');
funcs = regexp( str, '(?<="function">)[0-9A-Za-z.]+', 'match' );
Note: "alpha" in the URL is for "alphabetical" rather than to denote early testing!
funcs is a cell array with all the function names on that page.
The page used above is for the most recent MATLAB version. For a specific version, use the historic documentation pages structured like so:
https://mathworks.com/help/releases/R2017b/matlab/functionlist.html
Background: I'm trying to implement a time-series versioned DB using this approach, using gremlin (tinkerpop v3).
I want to get the latest state node (in red) for a given identity node (in blue) (linked by a 'state' edge which contains a timestamp range), but I want to return a single aggregated object which contains the id (cid) from the identity node and all the properties from the state node, but I don't want to have to list them explicitly.
(8640000000000000 is my way of indicating no 'to' date - i.e. the edge is current - slightly different from the image shown).
I've got this far:
:> g.V().hasLabel('product').
as('cid').
outE('state').
has('to', 8640000000000000).
inV().
as('name').
as('price').
select('cid', 'name','price').
by('cid').
by('name').
by('price')
=>{cid=1, name="Cheese", price=2.50}
=>{cid=2, name="Ham", price=5.00}
but as you can see I have to list out the properties of the 'state' node - in the example above the name and price properties of a product. But this will apply to any domain object so I don't want to have to list the properties all the time. I could run a query before this to get the properties but I don't think I should need to run 2 queries, and have the overhead of 2 round trips. I've looked at 'aggregate', 'union', 'fold' etc but nothing seems to do this.
Any ideas?
===================
Edit:
Based on Daniel's answer (which doesn't quite do what I want ATM) I'm going to use his example graph. In the 'modernGraph' people-create->software. If I run:
> g.V().hasLabel('person').valueMap()
==>[name:[marko], age:[29]]
==>[name:[vadas], age:[27]]
==>[name:[josh], age:[32]]
==>[name:[peter], age:[35]]
then the results are a list of entities's with the properties. What I want is, on the assumption that a person can only create one piece of software ever (although hopefully we will see how this could be opened up later for lists of software created), to include the created software 'language' property into the returned entity to get:
> <run some query here>
==>[name:[marko], age:[29], lang:[java]]
==>[name:[vadas], age:[27], lang:[java]]
==>[name:[josh], age:[32], lang:[java]]
==>[name:[peter], age:[35], lang:[java]]
At the moment the best suggestion so far comes up with the following:
> g.V().hasLabel('person').union(identity(), out("created")).valueMap().unfold().group().by {it.getKey()}.by {it.getValue()}
==>[name:[marko, lop, lop, lop, vadas, josh, ripple, peter], lang:[java, java, java, java], age:[29, 27, 32, 35]]
I hope that's clearer. If not please let me know.
Since you didn't provide I sample graph, I'll use TinkerPop's toy graph to show how it's done.
Assume you want to merge marko and lop:
gremlin> g = TinkerFactory.createModern().traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V(1).valueMap()
==>[name:[marko],age:[29]]
gremlin> g.V(1).out("created").valueMap()
==>[name:[lop],lang:[java]]
Note, that there are two name properties and in theory you won't be able to predict which name makes it into your merged result; however that doesn't seem to be an issue in your graph.
Get the properties for both vertices:
gremlin> g.V(1).union(identity(), out("created")).valueMap()
==>[name:[marko],age:[29]]
==>[name:[lop],lang:[java]]
Merge them:
gremlin> g.V(1).union(identity(), out("created")).valueMap().
unfold().group().by(select(keys)).by(select(values))
==>[name:[lop],lang:[java],age:[29]]
UPDATE
Thank you for the added sample output. That makes it a lot easier to come up with a solution (although I think your output contains errors; vadas didn't create anything).
gremlin> g.V().hasLabel("person").
filter(outE("created")).map(
union(valueMap(),
outE("created").limit(1).inV().valueMap("lang")).
unfold().group().by {it.getKey()}.by {it.getValue()})
==>[name:[marko], lang:[java], age:[29]]
==>[name:[josh], lang:[java], age:[32]]
==>[name:[peter], lang:[java], age:[35]]
Merging edge and vertex properties using gremlin java DSL:
g.V().has('User', 'id', userDbId).outE(Edges.TWEETS)
.union(__.identity().valueMap(), __.inV().valueMap())
.unfold().group().by(__.select(Column.keys)).by(__.select(Column.values))
.map(v -> converter.toTweet((Map) v.get())).toList();
Thanks for the answer by Daniel Kuppitz and youhans it has given me a basic idea on the solution of the issue. But later I found out that the solution is not working for multiple rows. It is required to have local step for handling multiple rows. The modified gremlin query will look like:
g.V()
.local(
__.union(__.valueMap(), __.outE().inV().valueMap())
.unfold().group().by(__.select(Column.keys)).by(__.select(Column.values))
)
This will limit the scope of union and group by to a single row.
If you can work with custom DSL ,create custom DSL with java like this one.
public default GraphTraversal<S, LinkedHashMap> unpackMaps(){
GraphTraversal<S, LinkedHashMap> it = map(x -> {
LinkedHashMap mapSource = (LinkedHashMap) x.get();
LinkedHashMap mapDest = new LinkedHashMap();
mapSource.keySet().stream().forEach(key->{
Object obj = mapSource.get(key);
if (obj instanceof LinkedHashMap) {
LinkedHashMap childMap = (LinkedHashMap) obj;
childMap.keySet().iterator().forEachRemaining( key_child ->
mapDest.put(key_child,childMap.get(key_child)
));
} else
mapDest.put(key,obj);
});
return mapDest;
});
return it;
}
and use it freely like
g.V().as("s")
.valueMap().as("value_map_0")
.select("s").outE("INFO1").inV().valueMap().as("value_map_1")
.select("s").outE("INFO2").inV().valueMap().as("value_map_2")
.select("s").outE("INFO3").inV().valueMap().as("value_map_3")
.select("s").local(__.outE("INFO1").count()).as("value_1")
.select("s").outE("INFO1").inV().value("name").as("value_2")
.project("val_map1","val_map2","val_map3","val1","val2")
.by(__.select("value_map_1"))
.by(__.select("value_map_2"))
.by(__.select("value_1"))
.by(__.select("value_2"))
.unpackMaps()
results to rows with
map1_val1, map1_val2,.... ,map2_va1, map2_val2....,value1, value2
This can handle mix of values and valueMaps in a natural gremlin way.
MATLAB's methodsview tool is handy when exploring the API provided by external classes (Java, COM, etc.). Below is an example of how this function works:
myApp = actxserver('Excel.Application');
methodsview(myApp)
I want to keep the information in this window for future reference, by exporting it to a table, a cell array of strings, a .csv or another similar format, preferably without using external tools.
Some things I tried:
This window allows selecting one line at a time and doing "Ctrl+c Ctrl+v" on it, which results in a tab-separated text that looks like this:
Variant GetCustomListContents (handle, int32)
Such a strategy can work when there are only several methods, but not viable for (the usually-encountered) long lists.
I could not find a way to access the table data via the figure handle (w/o using external tools like findjobj or uiinspect), as findall(0,'Type','Figure') "do not see" the methodsview window/figure at all.
My MATLAB version is R2015a.
Fortunately, methodsview.m file is accessible and allows to get some insight on how the function works. Inside is the following comment:
%// Internal use only: option is optional and if present and equal to
%// 'noUI' this function returns methods information without displaying
%// the table. `
After some trial and error, I saw that the following works:
[titles,data] = methodsview(myApp,'noui');
... and returns two arrays of type java.lang.String[][].
From there I found a couple of ways to present the data in a meaningful way:
Table:
dataTable = cell2table(cell(data));
dataTable.Properties.VariableNames = matlab.lang.makeValidName(cell(titles));
Cell array:
dataCell = [cell(titles).'; cell(data)];
Important note: In the table case, the "Return Type" column title gets renamed to ReturnType, since table titles have to be valid MATLAB identifiers, as mentioned in the docs.
I’m trying to retrieve an array of structures through a COM interface. It works when the number of structures is 1. When the number of structures is greater than 1, only the first structure is marshaled correctly. The remaining structures in the array have garbage data.
My interface looks like this:
typedef struct tagINTOBJINTERFACE
{
long lObjectId;
IMyObject* pObj;
} INTOBJINTERFACE;
[
object,
uuid(<removed>),
dual,
nonextensible,
helpstring("Interface"),
pointer_default(unique)
]
interface IMyInterface : IUnknown {
HRESULT CreateObjects(
[in] VARIANT* pvDataStream,
[out]long* Count,
[out,size_is(,*Count)] INTOBJINTERFACE** ppStruct
);
};
I allocate the structure memory like this:
long lCountInterfaces = listInterfaces.GetCount();
long lMemSize = lCountInterfaces * sizeof(INTOBJINTERFACE);
INTOBJINTERFACE* pstruct = (INTOBJINTERFACE*) CoTaskMemAlloc( lMemSize );
And then fill in the members of each structure in the array. I can see in the debugger that all members of all array elements are properly assigned.
After filling in the structures, I assign “*ppStruct = pstruct” to pass the array out.
I can also see that the out parameter “*Count” is properly set to the correct number of elements.
Why doesn’t this work?
Reason:
Your application uses the universal marshaller from windows for mashalling.
The universal marshaller reads the meta data from your typelib (*.tlb).
The generated typelib doesn't support size_is.
Todo:
You should use the Proxy/Stub dll generated by Visual Studio (...PS project).
- Build the Proxy/Stub dll
- call "regsvr32 "
- remove the "TypeLib = s '{?????-...-????}'" entry from your servers "*.rgs"
file
In addition to Joerg's answer that using size_is is not possible, here is what's possible: SAFEARRAY.
Keywords: Safearray of UDT
Explanation and examples are here
Short summary:
Define structure with a GUID.
Create object of type IRecordInfo that describes your structure using the type library.
Use SafeArrayCreateEx to create SAFEARRAY of type VT_RECORD.
Fill it with data.
Retrieve on the other side.
I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example.
I'm trying to build something like this:
SELECT * FROM _orderItemObject WHERE _qtyOrdered - _qtySent > 0
If I try this statement in the Object Inspector I get a synthax error near the '-'.
Anyone has an example of a working VQL with that kind of statement?
Thanks
I am not sure that the Object Inspector will know the syntax for the arithmtic expression. However, in your code you should be referring to the fully qualified class. Then the syntax you are using should be perfectly fine.
Query query = new Query( session,
"select * from com.yourCompany.yourClass where _qtyOrdered - _qtySent > 0 ");
QueryResult result = query.execute();
I just tried this out on one of my classes and it worked fine.
Cheers,
-Robert
With C# and OQL you have to make sure you select the proper class extent. This is done by adding the "Extent" suffix to the class name. For example, in my Pet class I would identify all the pets with "PetExtent" in the OQL string.
Class members are accessed in the predicate by defining a local moniker, p in the code below. Any arithmetic expressions will be evaluated by the query engine.
string query="SELECT * FROM PetExtent AS p WHERE p.Name = \"Ferris\" AND (p.age + 5) > 4";
IQueryResult result = scope.GetOqlQuery(query).Execute();
foreach (object o in result)
Out(o.ToString());
The best way to test OQL with Versant's C# binding is to use the OQL Query Browser integrated into Visual Studio. Look under the Versant Menu drop down in Visual Studio.
Best Regards,
Derek