I have some HTML page and on this page I will provide the possibility for free text.
For example, it is possible to write in textbox either: 10 or 10 apples.
In a case of writing 10 apples I got NumberFormatException which is correct, but for me will be good to extract only number automatically without javascript writing.
Is it possible to map string from HTML page to the number in my java entity? May be with some annotation or somehow else?
Try:
final String stripped = textbox.getText().replaceAll("[^0-9]", "");
This takes the contents of the text field and strips out any characters that aren't digits. If you need to deal with floating point or negative numbers, it can be done, but becomes more complicated.
Related
I have a text filed which allows user to input numbers. This is what I did:
[_textfield setText:[NSString stringWithFormat:#"%d", [_textfield.text intValue]]];
Basically, I convert text in text filed to integer, then convert back to string. This will ensure the text is numbers only.
Now I need to store the text in _textfield into core data. I was wondering wether should use string as the attribute type or integer.
I know integer is a more sensible option. But to this case, every time the view is loaded, I need fetch this data and set to the _textfield. If I use integer as the attribute type, I have to convert to string each time. I know what I need to do is simply:
_textfield.text = [numberFromCoreData stringValue];
I don't need to compare, sort or do any arithmetic computation with that number, so should I just use string as the attribute type?
Integer searching is significantly faster than string searching. That is the single most compelling reason to use numbers in your persistence layer. Numbers also can sort differently than strings.
For performance reasons I would never use a string when I know the value is always going to be an integer. Control the input, force it to only accept numbers and keep your data integrity.
It depends how you need to use that field. In almost every case, integer data should be stored as an integer type, but not always. You definitely want an integer type if you'll ever be using that field in a case where its numeric value counts in some way. That includes sorting (because it's a hell of a lot faster with numeric fields), comparing numeric values, or any kind of mathematical operation.
But there's are exceptions. For example, in some cases fields which initially seem to be inherently numeric turn out not to be so. Like a "size" field which is normally an integer. But on closer inspection it turns out that some sizes are specified as "8 - 10", "12 - 14", etc. This happened in one app I worked on a couple of years ago. In that case I ended up using two fields for the data-- a numeric "sortSize" that could be used for sorting, and a string "displaySize" that included the full string.
It's probably not what you want but why don't you use a keyboard type "number Pad" for your textfield?
With that, you would be sure that you have only numbers into your textfield.
Honestly I can't think of a compelling reason. Strings in general take up more storage space than Integers but in the modern world of computing this isn't much of an issue. If you aren't really pushing you processor too hard I'd go with what is convenient.
From the most basic way of thinking about it an integer is a number but for a string the computer needs to know when the string ends, starts, and what is in it so its a little bigger.
I am doing some localization testing and I have to test for strings in both English and Japaneses. The English string might be 'Waiting time is {0} minutes.' while the Japanese string might be '待ち時間は{0}分です。' where {0} is a number that can change over the course of a test. Both of these strings are coming from there respective property files. How would I be able to check for the presence of the string as well as the number that can change depending on the test that's running.
I should have added the fact that I'm checking these strings on a web page which will display in the relevant language depending on the location of where they are been viewed. And I'm using watir to verify the text.
You can read elsewhere about various theories of the best way to do testing for proper language conversion.
One typical approach is to replace all hard-coded text matches in your code with constants, and then have a file that sets the constants which can be updated based on the language in use. (I've seen that done by wrapping the require of that file in a case statement based on the language being tested. Another approach is an array or hash for each value, enumerated by a variable with a name like 'language', which lets the tests change the language on the fly. So validations would look something like this
b.div(:id => "wait-time-message).text.should == WAIT_TIME_MESSAGE[language]
To match text where part is expected to change but fall within a predictable pattern, use a regular expression. I'd recommend a little reading about regular expressions in ruby, especially using unicode regular expressions in ruby, as well as some experimenting with a tool like Rubular to test regexes
In the case above a regex such as:
/Waiting time is \d+ minutes./ or /待ち時間は\d+分です。/
would match the messages above and expect one or more digits in the middle (note that it would fail if no digits appear, if you want zero or more digits, then you would need a * in place of the +
Don't check for the literal string. Check for some kind of intermediate form that can be used to render the final string.
Sometimes this is done by specifying a message and any placeholder data, like:
[ :waiting_time_in_minutes, 10 ]
Where that would render out as the appropriate localized text.
An alternative is to treat one of the languages as a template, something that's more limited in flexibility but works most of the time. In that case you could use the English version as the string that's returned and use a helper to render it to the final page.
I know ths is a common question here. I have read the solutions and modified the code then also i am not getting the solution so I have posted my code here.
when I read a value from the text box and parse the value into int from String in servlet, why does it show NumberFormatException?
String ph=request.getParameter("phone");
int phone=Integer.parseInt(ph.trim());// exception is generated here
You can't have any characters or symbols in an int AND the maximum size of an int is 2,147,483,647 which means the phone number 555 555 5555 would be to large to store in an int.
Change the parse to a long and it should fix your problem
A good rule to follow is do not store any number like SSN or Phone numbers's in numerical primitives. You want to leave the numerical primitives for values you plan on doing something math related. Keep them as strings if at all possible.
Because the value you are feeding it is not a valid integer. Make sure it doesn't have strange characters in it.
9835008199 is higher then MAXINT, so that's probaly it.
The docs tell me:
Throws NumberFormatException - if the string does not contain a parsable integer.
On another note: do not store phone numbers as integers. You will get in trouble (you are in fact already). Rule of thumb: if you do not want to do math with a number, it's not an int, but a string.
Use isNumber function to check whether it is a valid number.
I have to generate QRCodes using concatenated object properties. These strings might be long, that's why I'd like to know which compression algorithm to use knowing that my String's length is between 25 an 100+ characters
thanks in advance,
Jerec
I am assuming that since you are going to use compression before you store the strings that these QR codes will not be readable by any client, it would have to be an application that you wrote (b/c you are storing character with an unknown encoding, the client won't be able to decode).
Instead of compressing and storing the long string in the QR code, have your application create a URI (like a GUID or a URL) and when your application decodes that URI it looks up all the values (uncompressed) that you wanted to store in the QR code. Then your app can just look up the format in any way it wants.
For example, assuming your persistant storage is an xml file, but it could be anything:
<URI = "http://mydomain.com/790C9704-8C61-435F-991D-CDBB5767AA3D">
<MyElement>14523</MyElement>
<MyElement>67548</MyElement>
...
<MyElement>46167</MyElement>
</URI>
Encoded on QR code: "http://mydomain.com/790C9704-8C61-435F-991D-CDBB5767AA3D", values can then be looked up.
The algorithm used to encode QR codes is dependent on the type of data you encode. See http://www.swetake.com/qr/qr1_en.html.
If you know, for example, that you always have the same number of digits per id and therefor could just string them together without punctuation, you can encode them as purely numeric and you'll use 10 bits for every three characters.
If you need some kind of separator, if you use something in "0-9A-Z $%*+-./:", you'll stay alphanumeric and get 2 characters in 11 bits.
If you give it arbitrary data (note that this includes any lower case: the list above does not include lower case letters) you're going to be using 8 bits per characters.
So numeric only would end up being 60% smaller.
I need to parse some text from pdfs but the pdf formatting results in extremely unreliable spacing. The result is that I have to ignore the spaces and have a continuous stream of non-space characters.
Any suggestions on how to parse the string and put spaces back into the string by guessing?
I'm using ruby. Or should I say I'musingruby?
Edit: I've pulled the text out using pdf-reader. Some of the pdf files are nicely formatted and some are not. An example of text mixed with positioning:
.7aspe-5.5cts-715.1o0.6f-708.5f-0.4aces-721.4that-716.3are-720.0i-1.8mportant-716.3in-713.9soc-5.5i-1.8alcommunica6.6tion6.3.-711.6Althoug6.3h-708.1m-1.9od6.3els-709.3o6.4f-702.8f5.4ace-707.9proc6.6essing-708.2haveproposed-611.2ways-615.5to-614.7deal-613.2with-613.0these-613.9diff10.4erent-613.7tasks,-611.9it-617.1remainsunclear-448.0how-450.7these-443.2mechanisms-451.7might-446.7be-447.7implemented-447.2in-450.3visualOne-418.9model-418.8of-417.3human-416.4face-421.9processing-417.5proposes-422.7that-419.8informa-tion-584.5is-578.0processed-586.1in-583.1specialised-584.7modules-577.0(Breen-584.4et-582.9al.,-582.32002;Bruce-382.1and-384.0Y92.0oung,-380.21986;-379.2Haxby-379.9et-380.5al.,-
and if I print just string data (I added returns at the end of each line to keep it from
messing up the layout here:
'Distinctrepresentationsforfacialidentityandchangeableaspectsoffacesinthehumantemporal
lobeTimothyJ.Andrews*andMichaelP.EwbankDepartmentofPsychology,WolfsonResearchInstitute,
UniversityofDurham,UKReceived23December2003;revised26March2004;accepted27July2004Availab
leonline14October2004Theneuralsystemunderlyingfaceperceptionmustrepresenttheunchanging
featuresofafacethatspecifyidentity,aswellasthechangeableaspectsofafacethatfacilitates
ocialcommunication.However,thewayinformationaboutfacesisrepresentedinthebrainremainsc
ontroversial.Inthisstudy,weusedfMRadaptation(thereductioninfMRIactivitythatfollowsthe
repeatedpresentationofidenticalimages)toaskhowdifferentface-andobject-selectiveregionsofvisualcortexcontributetospecificaspectsoffaceperception'
The data is spit out by callbacks so if I print each string as it is returned it looks like this:
'The
-571.3
neural
-573.7
system
-577.4
underly
13.9
ing
-577.2
face
-573.0
perc
13.7
eption
-574.9
must
-572.1
repr
20.8
esent
-577.0
the
unchangin
14.4
g
-538.5
featur
16.5
es
-529.5
of
-536.6
a
-531.4
face
'
On examination it looks like the true spaces are large negative numbers < -300 and the false spaces are much smaller positive numbers. Thanks guys. Just getting to the point where i am asking the question clearly helped me answer it!
Hmmmm... I'd have to say that guessing is never a good idea. Looking at the problem root cause and solving that is the answer, anything else is a kludge.
If the spacing is unreliable from the PDF, how is it unreliable? The PDF viewer needs to be able to reliably space the text so the data is there somewhere, you just need to find it.
EDIT following comment:
The idea of parsing the file using a dictionary (your only other option really, apart from randomly inserting spaces and hoping for the best) and inserting spaces at identified word boundaries (a real problem when dealing with punctuation, plurals that don't alter the base word i.e. plural, etc) would, I believe, be a much greater programming challenge than correctly parsing the PDF in the first place. After all, PDF is clearly defined whereas English is somewhat wooly.
Why not look down the route of existing solutions like ps2ascii in linux, call the function from your Ruby and pick up the result.
PDF doesn't only store spaces as space characters, but also uses layout commands for spacing (so it doesn't print a space, but moves the "pen" to the right). Perhaps you should have a look at the PDF reference (the big PDF on the bottom of the site), Chapter 9 "Text" should be what you're looking for.
EDIT: After reading your comment to Lazarus' answer, this doesn't seem to be what you're looking for. I think you should try to get a word list from somewhere and try to split your text using it. A good strategy would be to do that using recursion, because for example:
"meandyou"
The first word could be "me" or "mean", but if you try "mean", "dyou" doesn't make sense, so it will be "me", same for the next word that could be "a" or "an" or "and", only "and" makes sense.
If it were me I'd go back to the source PDFs and try a different method of extracting the text, such as iText (for Java) or maybe some kind of PDF-to-HTML to text conversion software method.