java - Is it possible to combine three Spring Data Specifications into one? - Stack Overflow

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I have three specifications that, I would like to combine into one.

static Specification<Car> hasCarModel(List<String> modelsList) {
  return (car, cq, cb) -> cb.and(car.get("model").in(modelsList));
}

static Specification<Car> hasCreatedDateGreaterThanOrEqualToStartDate(LocalDateTime _startDate) {
  return (car, cq, cb) -> cb.greaterThanOrEqualTo(car.get("carCreatedDate"), _startDate);
}

static Specification<Car> hasCreatedDateLessThanOrEqualToEndDate(LocalDateTime _endDate) {
   return (car, cq, cb) -> cb.lessThanOrEqualTo(car.get("carCreatedDate"), _endDate);
}

Is this doable? If so, how would you do it?

I have three specifications that, I would like to combine into one.

static Specification<Car> hasCarModel(List<String> modelsList) {
  return (car, cq, cb) -> cb.and(car.get("model").in(modelsList));
}

static Specification<Car> hasCreatedDateGreaterThanOrEqualToStartDate(LocalDateTime _startDate) {
  return (car, cq, cb) -> cb.greaterThanOrEqualTo(car.get("carCreatedDate"), _startDate);
}

static Specification<Car> hasCreatedDateLessThanOrEqualToEndDate(LocalDateTime _endDate) {
   return (car, cq, cb) -> cb.lessThanOrEqualTo(car.get("carCreatedDate"), _endDate);
}

Is this doable? If so, how would you do it?

• java
• spring-data-jpa

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1 Answer 1

Sorted by: Reset to default 0

Yes, it is possible to combine the specifications into one. we have to use Specification API in Spring Data to combine. You can combine the specifications using the and() and or() methods.

here's how yu can do it.

Specification<Car> combinedSpecification(List<String> modelsList, LocalDateTime startDate, LocalDateTime endDate) 
{
     return Specification.where(hasCarModel(modelsList))
             .and(hasCreatedDateGreaterThanOrEqualToStartDate(startDate))             
             .and(hasCreatedDateLessThanOrEqualToEndDate(endDate)); 
}

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