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1   package de.dlr.shepard.context.references.dataobject.daos;
2   
3   import de.dlr.shepard.common.util.Constants;
4   import de.dlr.shepard.common.util.CypherQueryHelper;
5   import de.dlr.shepard.context.references.dataobject.entities.DataObjectReference;
6   import de.dlr.shepard.context.version.daos.VersionableEntityDAO;
7   import jakarta.enterprise.context.RequestScoped;
8   import java.util.Collections;
9   import java.util.List;
10  import java.util.UUID;
11  import java.util.stream.StreamSupport;
12  
13  @RequestScoped
14  public class DataObjectReferenceDAO extends VersionableEntityDAO<DataObjectReference> {
15  
16    /**
17     * Searches the database for references.
18     *
19     * @param dataObjectId identifies the dataObject
20     * @return a List of references
21     */
22    public List<DataObjectReference> findByDataObjectNeo4jId(long dataObjectId) {
23      String query =
24        "MATCH (d:DataObject)-[hr:has_reference]->%s WHERE ID(d)=%d ".formatted(
25            CypherQueryHelper.getObjectPart("r", "DataObjectReference", false),
26            dataObjectId
27          ) +
28        CypherQueryHelper.getReturnPart("r");
29  
30      var queryResult = findByQuery(query, Collections.emptyMap());
31  
32      List<DataObjectReference> result = StreamSupport.stream(queryResult.spliterator(), false)
33        .filter(r -> r.getDataObject() != null)
34        .filter(r -> r.getDataObject().getId().equals(dataObjectId))
35        .toList();
36  
37      return result;
38    }
39  
40    @SuppressWarnings({ "PMD.ConsecutiveAppendsShouldReuse", "PMD.InefficientStringBuffering" })
41    public List<DataObjectReference> findByDataObjectShepardId(long dataObjectShepardId, UUID versionUID) {
42      StringBuilder queryStringBuilder = new StringBuilder(90)
43        .append("MATCH (v:Version)<-[:has_version]-(d:DataObject)-[hr:has_reference]->")
44        .append(CypherQueryHelper.getObjectPart("r", "DataObjectReference", false))
45        .append(" WHERE d." + Constants.SHEPARD_ID + "=")
46        .append(dataObjectShepardId)
47        .append(" AND ");
48      if (versionUID == null) queryStringBuilder.append(CypherQueryHelper.getVersionHeadPart("v"));
49      else queryStringBuilder.append(CypherQueryHelper.getVersionPart("v", versionUID));
50      queryStringBuilder.append(' ').append(CypherQueryHelper.getReturnPart("r"));
51      var query = queryStringBuilder.toString();
52      var queryResult = findByQuery(query, Collections.emptyMap());
53      List<DataObjectReference> result = StreamSupport.stream(queryResult.spliterator(), false)
54        .filter(r -> r.getDataObject() != null)
55        .filter(r -> r.getDataObject().getShepardId().equals(dataObjectShepardId))
56        .toList();
57      return result;
58    }
59  
60    @Override
61    public Class<DataObjectReference> getEntityType() {
62      return DataObjectReference.class;
63    }
64  }