Java QueryBuilder类代码示例

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
private List<Change> getChangesByType(Class type, UUID id, String author,
                                      String changedPropertyName, Pageable page) {
  QueryBuilder queryBuilder;

  if (id != null) {
    queryBuilder = QueryBuilder.byInstanceId(id, type);
  } else {
    queryBuilder = QueryBuilder.byClass(type);
  }

  int skip = Pagination.getPageNumber(page);
  int limit = Pagination.getPageSize(page);

  queryBuilder = queryBuilder.withNewObjectChanges(true).skip(skip).limit(limit);

  if ( StringUtils.isNotBlank(author) ) {
    queryBuilder = queryBuilder.byAuthor(author);
  }
  if ( StringUtils.isNotBlank(changedPropertyName) ) {
    queryBuilder = queryBuilder.andProperty(changedPropertyName);
  }

  /* Depending on the business' preference, we can either use findSnapshots() or findChanges().
     Whereas the former returns the entire state of the object as it was at each commit, the later
     returns only the property and values which changed. */
  //List<Change> changes = javers.findSnapshots(queryBuilder.build());
  List<Change> changes = javers.findChanges(queryBuilder.build());

  changes.sort((o1, o2) -> -1 * o1.getCommitMetadata().get().getCommitDate()
                                .compareTo(o2.getCommitMetadata().get().getCommitDate()));
  return changes;
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
/**
 * Init Javers with all current studies if there are no study commits in Javers yet.
 */
@PostConstruct
public void initJaversForStudies() {
  if (!metadataManagementProperties.getServer().getInstanceIndex().equals(0)) {
    log.debug("This is server instance {} therefore skipping javers init for studies.", 
        metadataManagementProperties.getServer().getInstanceIndex());
    return;
  }
  List<CdoSnapshot> snapshots =
      javers.findSnapshots(QueryBuilder.byClass(Study.class).limit(1).build());
  // only init if there are no studies yet
  if (snapshots.isEmpty()) {
    log.debug("Going to init javers with all current studies");
    studyRepository.streamAllBy().forEach(study -> {
      javers.commit(study.getLastModifiedBy(), study);
    });
  }
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
/**
 * Get the previous 10 versions of the study.
 * 
 * @param studyId The id of the study
 * @param limit like page size
 * @param skip for skipping n versions
 * 
 * @return A list of previous study versions or null if no study found
 
 */
public List<Study> findPreviousStudyVersions(String studyId, int limit, int skip) {
  Study study = studyRepository.findOne(studyId);
  
  if (study == null) {
    return null;
  }
  
  QueryBuilder jqlQuery = QueryBuilder.byInstance(study)
      .withScopeDeepPlus(100)
      .limit(limit).skip(skip);

  List<Shadow<Study>> previousVersions = javers.findShadows(jqlQuery.build());

  return previousVersions.stream().map(shadow -> {
    Study studyVersion = shadow.get();
    if (studyVersion.getId() == null) {
      // deleted shadow        
      studyVersion.setLastModifiedBy(shadow.getCommitMetadata().getAuthor());
      studyVersion.setLastModifiedDate(shadow.getCommitMetadata().getCommitDate());
    }
    return studyVersion;
  }).collect(Collectors.toList());
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
@Override
public void handle(RepositoryMetadata repositoryMetadata, Object domainObjectOrId) {
    Map<String, String> props = commitPropertiesProvider.provide();
    String author = authorProvider.provide();

    if (isIdClass(repositoryMetadata, domainObjectOrId)) {
        if (javers.findSnapshots(QueryBuilder.byInstanceId(domainObjectOrId, repositoryMetadata.getDomainType()).build()).size() == 0) {
            return;
        }

        javers.commitShallowDeleteById(author, instanceId(domainObjectOrId, repositoryMetadata.getDomainType()), props);
    } else if (isDomainClass(repositoryMetadata, domainObjectOrId)) {
        if (javers.findSnapshots(QueryBuilder.byInstance(domainObjectOrId).build()).size() == 0) {
            return;
        }

        javers.commitShallowDelete(author, domainObjectOrId, props);
    } else {
        throw new IllegalArgumentException("Domain object or object id expected");
    }
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
@Test
public void shouldCommitToJaversRepository() {
    //given:

    // prepare JaVers instance. By default, JaVers uses InMemoryRepository,
    // it's useful for testing
    Javers javers = JaversBuilder.javers().build();

    // init your data
    Person robert = new Person("bob", "Robert Martin");
    // and persist initial commit
    javers.commit("user", robert);

    // do some changes
    robert.setName("Robert C.");
    // and persist another commit
    javers.commit("user", robert);

    // when:
    List<CdoSnapshot> snapshots = javers.findSnapshots(
        QueryBuilder.byInstanceId("bob", Person.class).build());

    // then:
    // there should be two Snapshots with Bob's state
    assertThat(snapshots).hasSize(2);
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
@Test
public void shouldListStateHistory() {
    // given:
    // commit some changes
    Javers javers = JaversBuilder.javers().build();
    Person robert = new Person("bob", "Robert Martin");
    javers.commit("user", robert);

    robert.setName("Robert C.");
    javers.commit("user", robert);

    // when:
    // list state history - last 10 snapshots
    List<CdoSnapshot> snapshots = javers.findSnapshots(
        QueryBuilder.byInstanceId("bob", Person.class).limit(10).build());

    // then:
    // there should be two Snapshots with Bob's state
    assertThat(snapshots).hasSize(2);
    CdoSnapshot newState = snapshots.get(0);
    CdoSnapshot oldState = snapshots.get(1);
    assertThat(oldState.getPropertyValue("name")).isEqualTo("Robert Martin");
    assertThat(newState.getPropertyValue("name")).isEqualTo("Robert C.");
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
@Test
public void shouldListChangeHistory() {
    // given:
    // commit some changes
    Javers javers = JaversBuilder.javers().build();
    Person robert = new Person("bob", "Robert Martin");
    javers.commit("user", robert);

    robert.setName("Robert C.");
    javers.commit("user", robert);

    // when:
    // list change history
    List<Change> changes = javers.findChanges(
        QueryBuilder.byInstanceId("bob", Person.class).build());

    // then:
    // there should be one ValueChange with Bob's firstName
    assertThat(changes).hasSize(1);
    ValueChange change = (ValueChange) changes.get(0);
    assertThat(change.getPropertyName()).isEqualTo("name");
    assertThat(change.getLeft()).isEqualTo("Robert Martin");
    assertThat(change.getRight()).isEqualTo("Robert C.");
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
private void createSnapshot(Object object) {
  //...check whether there exists a snapshot for it in the audit log.
  // Note that we don't care about checking for logged changes, per se,
  // and thus use findSnapshots() rather than findChanges()
  BaseEntity baseEntity = (BaseEntity) object;

  QueryBuilder jqlQuery = QueryBuilder.byInstanceId(baseEntity.getId(), object.getClass());
  List<CdoSnapshot> snapshots = javers.findSnapshots(jqlQuery.build());

  //If there are no snapshots of the domain object, then take one
  if (snapshots.size() == 0) {
    javers.commit("System: AuditLogInitializer", baseEntity);
  }
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
@Test
public void shouldAlwaysCommitWithUtcTimeZone() throws IOException {

  //given
  Widget widget = new Widget();
  widget.setId(UUID.randomUUID());
  widget.setName("name_1");

  //when
  DateTimeZone.setDefault(DateTimeZone.forID("UTC"));
  javers.commit(COMMIT_AUTHOR, widget);

  DateTimeZone.setDefault(DateTimeZone.forID("Africa/Johannesburg"));
  widget.setName("name_2");
  javers.commit(COMMIT_AUTHOR, widget);

  //then
  List<CdoSnapshot> snapshots = javers.findSnapshots(
                                          QueryBuilder.byClass(Widget.class).build());
  assertEquals(2, snapshots.size());

  LocalDateTime commitTime1 = snapshots.get(0).getCommitMetadata().getCommitDate();
  LocalDateTime commitTime2 = snapshots.get(1).getCommitMetadata().getCommitDate();

  int delta = Math.abs(Seconds.secondsBetween(commitTime1, commitTime2).getSeconds());
  assertTrue(delta < 1);
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
/**
 * Init Javers with all current study attachments if there are no 
 * study attachment commits in Javers yet.
 */
@PostConstruct
public void initJaversForStudyAttachments() {
  if (!metadataManagementProperties.getServer().getInstanceIndex().equals(0)) {
    log.debug("This is server instance {} therefore skipping javers init for study attachments.", 
        metadataManagementProperties.getServer().getInstanceIndex());
    return;
  }
  List<CdoSnapshot> snapshots =
      javers.findSnapshots(QueryBuilder.byClass(StudyAttachmentMetadata.class).limit(1).build());
  // only init if there are no studies yet
  if (snapshots.isEmpty()) {
    log.debug("Going to init javers with all current study attachment");
    List<GridFSDBFile> files = operations.find(
        new Query(GridFsCriteria.whereFilename().regex(
            StudyAttachmentFilenameBuilder.ALL_STUDY_ATTACHMENTS)));
    files.stream().forEach(file -> {
      StudyAttachmentMetadata studyAttachmentMetadata = mongoTemplate.getConverter().read(
          StudyAttachmentMetadata.class, file.getMetaData());
      studyAttachmentMetadata.generateId();
      DBObject dbObject = new BasicDBObject();
      mongoTemplate.getConverter().write(studyAttachmentMetadata, dbObject);
      file.setMetaData(dbObject);
      file.save();
      javers.commit(studyAttachmentMetadata.getLastModifiedBy(), studyAttachmentMetadata);
    });
  }
}
 

import org.javers.repository.jql.QueryBuilder; //导入依赖的package包/类
/**
 * Get the previous 10 versions of the study attachment.
 * 
 * @param studyId The id of the study
 * @param filename The filename of the attachment
 * @param limit like page size
 * @param skip for skipping n versions
 * 
 * @return A list of previous study versions or null if no study found
 */
public List<StudyAttachmentMetadata> findPreviousStudyAttachmentVersions(String studyId,
    String filename, int limit, int skip) {
  GridFSDBFile file = operations.findOne(
      new Query(GridFsCriteria.whereFilename().is(
          StudyAttachmentFilenameBuilder.buildFileName(studyId, filename))));
  
  if (file == null) {
    return null;
  }
  
  StudyAttachmentMetadata studyAttachmentMetadata = mongoTemplate.getConverter().read(
      StudyAttachmentMetadata.class, file.getMetaData());
  
  QueryBuilder jqlQuery = QueryBuilder.byInstance(studyAttachmentMetadata)
      .withScopeDeepPlus(100)
      .limit(limit).skip(skip);

  List<Shadow<StudyAttachmentMetadata>> previousVersions = javers.findShadows(jqlQuery.build());

  return previousVersions.stream().map(shadow -> {
    StudyAttachmentMetadata metadata = shadow.get();
    if (metadata.getId() == null) {
      // deleted shadow        
      metadata.setLastModifiedBy(shadow.getCommitMetadata().getAuthor());
      metadata.setLastModifiedDate(shadow.getCommitMetadata().getCommitDate());
    }
    return metadata;
  }).collect(Collectors.toList());
}