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Are there any good java libraries for parsing & dealing with proprietary messages in UDP size packets? The message is a simple byte array, where each byte(s) represents enums or text/ascii values.
You could also use a ByteBuffer to wrap your byte[]
Use DataInputStream to read the type of data you want if it fits the conversions (i.e. when reading an int check the endianess used by DataNIputStream matches your platform), wrapped around a ByteArrayInputStream directly fed by your byte array.
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I am trying to learn more about emoji and how they are represented in Unicode. Somewhere I read that emojis are constructed with surrogate pairs, while I recently found '\u263A' which represents '☺'. I am just trying to understand if there is a specific rule with which all emojis are constructed or there can be any unicode value(inside or outside BMP) which may represent an emoji?
Also, it will be helpful if someone can point me to a JAVA API which identifies if a character represents an emoji or is part of an emoji representation(in case of surrogate pairs).
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I have a XML file whit 25 000 record. What parser is best for this XML, Stax or DOM?
SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="https://webapi.allegro.pl/service.php">
<SOAP-ENV:Body>
<ns1:doGetCatsDataResponse>
<ns1:catsList>
<ns1:item>
<ns1:catId>26013</ns1:catId>
<ns1:catName>Antyki i Sztuka</ns1:catName>
<ns1:catParent>0</ns1:catParent>
<ns1:catPosition>0</ns1:catPosition>
<ns1:catIsProductCatalogueEnabled>0</ns1:catIsProductCatalogueEnabled>
</ns1:item>
<ns1:item>
<ns1:catId>98553</ns1:catId>
<ns1:catName>Bilety</ns1:catName>
<ns1:catParent>0</ns1:catParent>
<ns1:catPosition>1</ns1:catPosition>
<ns1:catIsProductCatalogueEnabled>0</ns1:catIsProductCatalogueEnabled>
</ns1:item>
<ns1:item>
.......
With regards to memory and speed, when you have a huge XML in hand, its better to go with SAX/StAX instead of a DOM parser. Thats because a DOM parser will load the complete XML into memory and construct a tree which would take up even more memory. SAX/StAX on the other hand does not load the file and only scans the XML one element at a time.
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I need to generate a valid dictionary word of certain length but in a random fashion. Is there an api or code snippet that does this? I tried googling it but couldn't find anything for this.
Thanks
You can download this .csv file which has around 200 thousand English words.
You can then parse the .csv file, add the entries to an ArrayList. Then create a function that randomly generates a number between the available indices of the ArrayList and then use it to get an entry at that random index. Or, you can think of something alike yourself.
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Is there any java third party library which can be used to implement Excel's LINEST function? I want to calculate LINEST value same as LINEST[known_y's;known_x's;cont;stats] function in Excel for an array of 'x' and 'y' values. Please let me know if anyone has an idea in implementing this.
Use ApacheCommons Math Library. There are specific SimpleRegression class.
Maybe help you!
From https://support.office.com/en-us/article/LINEST-function-84d7d0d9-6e50-4101-977a-fa7abf772b6d:
"The LINEST function calculates the statistics for a line by using the 'least squares' method to calculate a straight line that best fits your data" Looks like you just need to find an algorithm for for working out the least squares
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Which Java libraries parse HTTP Accept header?
You should read this article : http://www.xml.com/pub/a/2005/06/08/restful.html
The article uses Python but it's not a problem : at the end, the following link is shared : http://code.google.com/p/mimeparse
As you can see, "mimeparse" is :
Basic functions for handling mime-types in Erlang, JavaScript, Perl, PHP, Python, Ruby, Java
According to the home page :
List<String> mimeTypesSupported = Arrays.asList(StringUtils.split(
"application/xbel+xml,text/xml", ','));
String bestMatch = MIMEParse.bestMatch(mimeTypesSupported, "text/*;q=0.5,*/*;q=0.1");
Have a look at the HttpClient Util.parseHeader method.
Edit: (trying to make this answer worth being accepted post-factum)
The spring framework provides this functionality within its MediaType component.
If you are already using Spring MVC you can simply request for a #RequestHeader-annotated parameter of type HttpHeaders and access the list of accepted media types by simply calling HttpHeaders.getAccept().