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feat: use name spaces in knowledge graph (#32)
* feat: small improvements * feat: use name spaces in knowledge graph * fix: broken test * feat: blue bike popup improved * feat: small improvements and fixes
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2 changes: 1 addition & 1 deletion
2
.../be/informatievlaanderen/vsds/demonstrator/triple/application/services/TripleService.java
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22 changes: 0 additions & 22 deletions
22
...a/be/informatievlaanderen/vsds/demonstrator/triple/domain/entities/MemberDescription.java
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6 changes: 4 additions & 2 deletions
6
...e/informatievlaanderen/vsds/demonstrator/triple/domain/repositories/TripleRepository.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,9 @@ | ||
| package be.informatievlaanderen.vsds.demonstrator.triple.domain.repositories; | ||
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| import be.informatievlaanderen.vsds.demonstrator.triple.domain.entities.MemberDescription; | ||
| import be.informatievlaanderen.vsds.demonstrator.triple.domain.valueobjects.Triple; | ||
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| import java.util.List; | ||
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| public interface TripleRepository { | ||
| MemberDescription getById(String id); | ||
| List<Triple> getById(String id); | ||
| } |
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...java/be/informatievlaanderen/vsds/demonstrator/triple/domain/services/TriplesFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package be.informatievlaanderen.vsds.demonstrator.triple.domain.services; | ||
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| import be.informatievlaanderen.vsds.demonstrator.triple.domain.valueobjects.Node; | ||
| import be.informatievlaanderen.vsds.demonstrator.triple.domain.valueobjects.Triple; | ||
| import org.eclipse.rdf4j.model.IRI; | ||
| import org.eclipse.rdf4j.model.Model; | ||
| import org.eclipse.rdf4j.model.Statement; | ||
| import org.eclipse.rdf4j.model.Value; | ||
| import org.jetbrains.annotations.NotNull; | ||
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| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.stream.Stream; | ||
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| public class TriplesFactory { | ||
| private static final Map<String, String> COMMON_NAMESPACES = Map.ofEntries( | ||
| Map.entry("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#"), | ||
| Map.entry("rdfs", "http://www.w3.org/2000/01/rdf-schema#"), | ||
| Map.entry("owl", "http://www.w3.org/2002/07/owl#"), | ||
| Map.entry("xsd", "http://www.w3.org/2001/XMLSchema#"), | ||
| Map.entry("dct", "http://purl.org/dc/terms/"), | ||
| Map.entry("adms", "http://www.w3.org/ns/adms#"), | ||
| Map.entry("prov", "http://www.w3.org/ns/prov#"), | ||
| Map.entry("purl", "http://purl.org/dc/elements/1.1/"), | ||
| Map.entry("foaf", "http://xmlns.com/foaf/0.1/"), | ||
| Map.entry("org", "http://www.w3.org/ns/org#"), | ||
| Map.entry("legal", "http://www.w3.org/ns/legal#"), | ||
| Map.entry("m8g", "http://data.europa.eu/m8g/"), | ||
| Map.entry("locn", "http://www.w3.org/ns/locn#"), | ||
| Map.entry("ldes", "http://w3id.org/ldes#"), | ||
| Map.entry("tree", "https://w3id.org/tree#"), | ||
| Map.entry("sh", "http://www.w3.org/ns/shacl#"), | ||
| Map.entry("skos", "http://www.w3.org/2004/02/skos/core#"), | ||
| Map.entry("schema", "http://schema.org/") | ||
| ); | ||
| private static final String VALID_PREFIX_REGEX = "^[a-zA-Z_][\\w.-]*$"; // NCName regex | ||
| private final Stream<Statement> statementStream; | ||
| private final Map<String, String> namespaces; | ||
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| private TriplesFactory(@NotNull Model model) { | ||
| this.statementStream = model.stream(); | ||
| namespaces = new HashMap<>(COMMON_NAMESPACES); | ||
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| } | ||
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| /** | ||
| * Assigns the namespaces to this factory | ||
| * | ||
| * @param namespaces Map with namespace prefix as key and the according name as value | ||
| * @return the factory whereon this method is called | ||
| */ | ||
| public TriplesFactory withNamespaces(@NotNull Map<String, String> namespaces) { | ||
| this.namespaces.putAll(namespaces); | ||
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| return this; | ||
| } | ||
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| /** | ||
| * Initialize an instance of TriplesFactory with the specified Model | ||
| * | ||
| * @param model Model with which the initialization needs to be done | ||
| * @return new instance of TriplesFactory | ||
| */ | ||
| public static TriplesFactory fromModel(@NotNull Model model) { | ||
| return new TriplesFactory(model); | ||
| } | ||
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| /** | ||
| * Converts all the statements of the model in this factory to a list of triples | ||
| * | ||
| * @return the list of triples | ||
| */ | ||
| public List<Triple> getTriples() { | ||
| return statementStream | ||
| .map(statement -> new Triple(valueToNode(statement.getSubject()), valueToNode(statement.getPredicate()), valueToNode(statement.getObject()))) | ||
| .toList(); | ||
| } | ||
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| private Node valueToNode(@NotNull Value value) { | ||
| if (value.isIRI()) { | ||
| String name = ((IRI) value).getNamespace(); | ||
| return getNamespace(name).or(() -> createNamespace(name)) | ||
| .map(namespace -> new Node(value.stringValue(), namespace)) | ||
| .orElseGet(() -> new Node(value.stringValue())); | ||
| } | ||
| return new Node(value.stringValue()); | ||
| } | ||
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| private Optional<Map.Entry<String, String>> getNamespace(@NotNull String name) { | ||
| return namespaces.entrySet().stream().filter(entry -> entry.getValue().equals(name)).findFirst(); | ||
| } | ||
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| private Optional<Map.Entry<String, String>> createNamespace(@NotNull String name) { | ||
| Optional<String> prefixOptional = name.contains("#") | ||
| ? createNamespacePrefix(name) | ||
| : createNonNamespacePrefix(name); | ||
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| return prefixOptional | ||
| .filter(prefix -> prefix.matches(VALID_PREFIX_REGEX)) | ||
| .map(prefix -> Map.entry(prefix, name)); | ||
| } | ||
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| private Optional<String> createNamespacePrefix(@NotNull String name) { | ||
| int lastIndexOfHashtag = name.lastIndexOf('#'); | ||
| int lastIndexOfSlash = name.lastIndexOf('/'); | ||
| return Optional.of(name.substring(lastIndexOfSlash + 1, lastIndexOfHashtag)); | ||
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| } | ||
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| private Optional<String> createNonNamespacePrefix(@NotNull String name) { | ||
| String[] nameSplit = name.split("/"); | ||
| int index = nameSplit.length - 1; | ||
| return Optional.ofNullable(nameSplit[index]); | ||
| } | ||
| } |
50 changes: 50 additions & 0 deletions
50
.../main/java/be/informatievlaanderen/vsds/demonstrator/triple/domain/valueobjects/Node.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| package be.informatievlaanderen.vsds.demonstrator.triple.domain.valueobjects; | ||
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| import org.jetbrains.annotations.NotNull; | ||
| import org.jetbrains.annotations.Nullable; | ||
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| import java.util.Map; | ||
| import java.util.Objects; | ||
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| public class Node { | ||
| private final String value; | ||
| private Map.Entry<String, String> namespace; | ||
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| public Node(@NotNull String value) { | ||
| this.value = value; | ||
| } | ||
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| public Node(@NotNull String value, @Nullable Map.Entry<String, String> namespace) { | ||
| this.value = value; | ||
| this.namespace = namespace; | ||
| } | ||
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| public String getValue() { | ||
| return value; | ||
| } | ||
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| public String getPrefixedValue() { | ||
| if (namespace != null) { | ||
| return value.replace(namespace.getValue(), "%s:".formatted(namespace.getKey())); | ||
| } | ||
| return value; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
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| Node node = (Node) o; | ||
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| if (!value.equals(node.value)) return false; | ||
| return Objects.equals(namespace, node.namespace); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| int result = value.hashCode(); | ||
| result = 31 * result + (namespace != null ? namespace.hashCode() : 0); | ||
| return result; | ||
| } | ||
| } |
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