predicates | Predicates for type checking , assertions , filtering etc | Widget library
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Predicates for type checking, assertions, filtering etc
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predicates Examples and Code Snippets
Lines of Code : 10
License : No License
CopyPredicate predicate = (s) -> s.length() > 0;
predicate.test("foo"); // true
predicate.negate().test("foo"); // false
Predicate nonNull = Objects::nonNull;
Predicate isNull = Objects::isNull;
Predicate isEmpty = String::isEmp def _case_create_default_action(predicates, actions):
"""Creates default action for a list of actions and their predicates.
It uses the input actions to select an arbitrary as default and makes sure
that corresponding predicates have valid val @Override
public List findAllUsersByPredicates(Collection> predicates) {
List allUsers = entityManager.createQuery("select u from User u", User.class).getResultList();
Stream allUsersStream = allUsers.stream();
for (jav def get_registrations(self):
return self._registered_predicates Community Discussions
Trending Discussions on predicates
QUESTION
I am calling the below function which returns me Promise
ANSWER
Answered 2022-Mar-24 at 01:09The reason why the return type is Promise is that the generic of Typecript expects the type based on the parameters entered. Therefore, the return type of PromiseFunction in res2 is Promise. The UnwrappedReturnType type expects the PromiseFn type return value. At this time, the ApiFn type is an extends of PromiseFn, and the PromiseFn type's return value is Promise, so the UnwrappedReturnType type is any.
Again, the errorHandler generic ApiFn type used as a parameter is the same as PromiseFn((...args: any[]) => Promise) type because there are no parameters expected.
In other words, if you specify the ApiFn generic type, res2 type inference is possible.
QUESTION
The following code compiles fine:
...ANSWER
Answered 2022-Mar-22 at 17:52Consider if we implement Fn manually (of course this requires nightly)...
QUESTION
I found that for most of my predicates, prolog finds multiple solutions, with one of them being the correct result, the other is 'false.'
To demontrate:
...ANSWER
Answered 2022-Mar-21 at 04:39You're not doing anything wrong, nor this is something to fix. What prolog is telling you by printing false at the end is that there are no other solutions than the ones it has already shown you. (Note that hitting ; tells prolog to show you more answers, you can also hit return to simply terminate the query.)
See Section 2.1.3 of https://www.swi-prolog.org/download/stable/doc/SWI-Prolog-8.2.1.pdf for details.
QUESTION
I got this below error when run the API-GATEWAY, I tried so many ways but I couldn't solve this issue.
Description:
Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway.
Action:
Please set spring.main.web-application-type=reactive or remove spring-boot-starter-web dependency.
Main Class
...ANSWER
Answered 2021-Aug-01 at 06:17Please note that Spring Cloud Gateway is not compatible with Spring MVC (spring-boot-starter-web). This is outlined in section "How to include Spring Cloud Gateway in the official reference documentation":
Spring Cloud Gateway is built on Spring Boot 2.x, Spring WebFlux, and Project Reactor. As a consequence, many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you know may not apply when you use Spring Cloud Gateway.
Additionally, it is stated that:
Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or when built as a WAR.
As already suggested by the error message, you would need to remove the dependency on spring-boot-starter-web. You can list all your direct and transitive dependencies with the following command:
QUESTION
Playing around with DCGs and stubled upon the following problem:
I want to parse as well as produce an exact amount of spaces (" "). My trivial approach of simply doing this:
ANSWER
Answered 2021-Aug-16 at 08:22For your specific example, you can use CLP(fd) to be able to use the DCG in both ways:
QUESTION
I have a Tag table (device_id, customer_id are foreign keys in this table) :
ANSWER
Answered 2022-Feb-15 at 09:53You have to always use sorting with paging, even for the default case.
It is simpler to count distinct(name, value) pairs. Don't forget to sort them.
Better to use inner join here
QUESTION
Edited:
I am trying to get the data by filtering it by dates, But I am getting the following error. I am accepting date in LocalDateTimeFormat. However, the type of created_date is Instant in JPA entity. I cannot change the type in entity because it might break other APis
ANSWER
Answered 2022-Jan-25 at 15:26As you can see in your stacktrace, the error is related to the conversion between the value you provided 2021-12-23T13:00 to Instant, probably when Spring Data executes the JPA Criteria query you created in your Specification.
To solve the problem you could try manually converting from LocalDateTime to Instant in your Specification code - I assume that both transactionSearchCriteria.getFromDate() and transactionSearchCriteria.getToDate() are String. For example:
QUESTION
I have written an external DSL with SWI-Prolog that works by parsing text with a DCG, transforms parsed expressions into facts that get asserted into the Prolog process, then exposes a query language to the user using the same DCG grammar to query against the facts.
I am stuck trying to figure out how to translate a ground term resulting from a DCG-based parser into a non-ground term with variables that can be passed into a functor like findall/3 to return a list of query results for the user.
Here is an example of a dataset that could be queried:
...ANSWER
Answered 2022-Jan-16 at 23:17Singleton variables are one way to go here. Your solution is actually fine and gives no warning if you mark the singleton variable as such with an underscore:
QUESTION
@Entity
public class Users {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "full_name", nullable = false, length = 50)
private String fullName;
@Column(name = "current_location", nullable = false)
private String currentLocation;
@Column(name = "gender", nullable = false, length = 6)
private String gender;
@Column(name = "birth_date", nullable = false)
private Timestamp birthDate;
}
ANSWER
Answered 2021-Dec-31 at 14:24I add age column , we can get age with out any calculation
QUESTION
I have a question regarding the removal of symmetrical values in my predicates. These predicates are in my database and I used assertz to add them there.
So I have:
...ANSWER
Answered 2021-Dec-12 at 03:50There are two distinct semantics for retract/1:
- immediate update view: upon backtracking, retracted clauses can no longer be seen (they became invisible immediately).
- logical update view: upon backtracking, retracted clauses can still be seen (they became invisible only on the next predicate call). This update view is the ISO standard.
In the logical update view, for example, when the predicate remove/1 is called:
- First it sees
foo(a,b)andfoo(b,a)and hence it retractsfoo(b,a). - Afterward, upon backtracking, it sees
foo(b,a)andfoo(a,b)and hence it also retractsfoo(a,b).
To solve the problem, you can use the ISO built-in predicate once/1 (which prevents backtracking).
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