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JpaSpecificationExecutor extension to find All Slice by Specification
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| package dev.joserg.jpa; | |
| import static org.springframework.data.domain.ScrollPosition.offset; | |
| import java.util.function.Function; | |
| import org.springframework.data.domain.Pageable; | |
| import org.springframework.data.domain.ScrollPosition; | |
| import org.springframework.data.domain.Slice; | |
| import org.springframework.data.domain.SliceImpl; | |
| import org.springframework.data.domain.Sort; | |
| import org.springframework.data.domain.Window; | |
| import org.springframework.data.jpa.domain.Specification; | |
| import org.springframework.data.jpa.repository.JpaSpecificationExecutor; | |
| import org.springframework.data.repository.query.FluentQuery.FetchableFluentQuery; | |
| public interface SliceSpecificationExecutor<T> extends JpaSpecificationExecutor<T> { | |
| default Window<T> findAllWindowed(Specification<T> spec, Sort sort, int limit, ScrollPosition scrollPosition) { | |
| return this.findBy(spec, toWindow(sort, limit, scrollPosition)); | |
| } | |
| default Window<T> findAllWindowed(Specification<T> spec, Sort sort, ScrollPosition scrollPosition) { | |
| return this.findBy(spec, toWindow(sort, scrollPosition)); | |
| } | |
| default Window<T> findAllWindowed(Specification<T> spec, ScrollPosition scrollPosition) { | |
| return this.findAllWindowed(spec, Sort.unsorted(), scrollPosition); | |
| } | |
| default Slice<T> findAllSliced(Specification<T> spec, Pageable pageable) { | |
| final var window = pageable.isUnpaged() | |
| ? this.findAllWindowed(spec, pageable.getSort(), offset()) | |
| : this.findAllWindowed(spec, pageable.getSort(), pageable.getPageSize(), offset(pageable.getOffset())); | |
| return new SliceImpl<>(window.getContent(), pageable, window.hasNext()); | |
| } | |
| private static <T> Function<FetchableFluentQuery<T>, Window<T>> toWindow(Sort sort, int limit, ScrollPosition scrollPosition) { | |
| return fetchableFluentQuery -> fetchableFluentQuery.sortBy(sort).limit(limit).scroll(scrollPosition); | |
| } | |
| private static <T> Function<FetchableFluentQuery<T>, Window<T>> toWindow(Sort sort, ScrollPosition scrollPosition) { | |
| return fetchableFluentQuery -> fetchableFluentQuery.sortBy(sort).scroll(scrollPosition); | |
| } | |
| } |
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