anymatch | Matches strings against configurable strings | Regex library
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QUESTION
Lets say I have multiple variables that measure substance abuse i.e a1 is on alcohal usage, a2 is on bhang and a3 is on cocaine. I would like to generate variable afin that indicates engaged in substance abuse if any of the the three is yes.
Is there a way to shorten the code so I don't specify use multiple ifelse
statements as below? Trying to find the best way to do it because I have more than 10 variables to collapse into one and writing ifelse
may not be ideal.
ANSWER
Answered 2021-Jun-09 at 13:11You can use rowSums
-
QUESTION
I have custom ConstraintValidator which checks @RequestParam for valid values. I also have hibernate entities with some attributes annotated with @NotNull.
Default behavior is that ConstraintViolationException is translated to HttpStatus=500. This is desired for error raising from hibernate (that is persisting entities and so). But I would like to raise HttpStatus=400 for ConstraintViolations raised from @RestController.
@ExceptionHandler works but it cannot distinguish between violations raised from hibernate and spring layer. I guess both layers uses hibernate validator dependency but we should be able to distinguish among those.
...ANSWER
Answered 2021-Jun-03 at 08:08As your code is spread across different layers you should be able to catch ConstraintViolationException
in each of them.
So in your facade you can catch it and rethrow them as RuntimeException
(or whatever the exception you want). Then your controller layer will map this exception to 500 internal error.
And in your controller layer keep your logic and translate ConstraintViolationException
to a 400 bad request response.
Updated : you're not forced to add try-catch boilerplate code everywhere.
Example : (don't copy paste this code. It is just to demonstrate how you can get rid of try-catch block at multiple places)
QUESTION
I am writing below code but it seems to be awkward. Could it be written better? Finally the code has to create a predicate consisted of list of predicates with OR condition.
First predicate, it shoould be appended to list of predicates
...ANSWER
Answered 2021-May-14 at 08:43You can reduce your stream by composing your predicates:
QUESTION
I am getting Mono
from response, User has a list of subscription, I have to check(through another api) if at least one of them matches the condition and then based on that I have to send further event.
ANSWER
Answered 2021-May-08 at 12:06Mono> hasSub(User user) {
return Flux.fromIterable(user.getSubscriptions())
.filterWhen(sub -> SubFacade.isPrioSub(sub.getId()))
.next() // takes the first element passing the filter
.map(x -> Pair.of(user, true))
.defaultIfEmpty(Pair.of(user, false));
}
QUESTION
I have collection of company and each company has list of department and department which are filtered based on complex multilevel condition. I would like to get the department info from some other source when there is no department found in a company and then proceed with filter condition as next step. Is the below implementation best way to achieve ?
...ANSWER
Answered 2021-May-07 at 01:57You can do the if/else
statement in you code as suggested already. If you want your colleagues to look weird at you (who does not like that?), you could write it as:
QUESTION
I'm building an ATM with spring boot and I'm trying to include some tests with a mock repository. But when I try to use one of my test methods I get the "java.lang.UnsupportedOperationException: remove" error. I'm new to this so I really don't understand why this is happening.
It is the withdrawOneThousand() test method that isn't working. The getAllBills() test method works fine.
Before I made a mock repository in the test class I tried the test method directly on the database and It worked fine.
My controller:
...ANSWER
Answered 2021-May-06 at 12:59List.of(b1)
that you return in mock returns unmodifiable list.
Btw Arrays.asList
doesn't support remove too.
You should change return of your mock to something like if you need removal from collection
QUESTION
I have a simple application which has 2 sets . I have to remove from Set1 based on the values from Set2.
Here is the code I have written :
ANSWER
Answered 2021-May-04 at 13:55- Let your IDE generate Users.hashCode() and Users.equals() based on the User-ID only
- Write
cList.removeAll(cList1);
(maybe rename "Users" to "User", as this class/object represents only one user per instance)
QUESTION
I'm trying to have this code repeat as long as the user does not type the correct information with the message "incorrect username or password" as you would see on any typical site. When I put the if statement in the loop and run the program, the 'if' statement works fine, however the 'else' statement is spammed. I tried putting the getUsername(); and getPassword(); under 'while(true)' and it seemed to fix that issue, however the 'Enter Username: ' and 'Enter Password: ' is repeated twice. What am I doing wrong?
...ANSWER
Answered 2021-May-02 at 03:08You are looping the results of your display method. You are not looping over the input i.e. get username and password. The idea is that You get username -> check -> display (These 3 steps happen in 1 big loop). You are looping only over the last step i.e. display.
QUESTION
I have several methods that are basically all the same except for one method that is called in these methods.
Example:
...ANSWER
Answered 2021-Apr-30 at 07:21The filter
Method takes a Predicate
as a parameter. So you can split the predicate from the rest.
QUESTION
How to I combine this looping in a single stream?
...ANSWER
Answered 2021-Apr-26 at 10:45Write a method e.g. isBad
:
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