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Ckan2RdfModule.java
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Ckan2RdfModule.java
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package cz.cvut.spipes.modules;
import cz.cvut.kbss.jopa.model.EntityManager;
import cz.cvut.kbss.jopa.model.JOPAPersistenceProperties;
import cz.cvut.kbss.jopa.model.descriptors.EntityDescriptor;
import cz.cvut.spipes.constants.KBSS_MODULE;
import cz.cvut.spipes.engine.ExecutionContext;
import cz.cvut.spipes.modules.annotations.SPipesModule;
import eu.trentorise.opendata.jackan.CkanClient;
import eu.trentorise.opendata.jackan.exceptions.CkanException;
import eu.trentorise.opendata.jackan.model.CkanCatalog;
import eu.trentorise.opendata.jackan.model.CkanDataset;
import eu.trentorise.opendata.jackan.model.CkanUser;
import java.net.URI;
import java.time.Instant;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.ResourceFactory;
import org.apache.jena.vocabulary.DC;
import org.apache.jena.vocabulary.RDF;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@SPipesModule(label = "ckan2rdf-v1", comment = "Convert ckan to rdf.")
public class Ckan2RdfModule extends AnnotatedAbstractModule {
public static final String TYPE_URI = KBSS_MODULE.uri + "ckan2rdf-v1";
public static final String NS_DDO = "http://onto.fel.cvut.cz/ontologies/dataset-descriptor/";
private static final Logger LOG = LoggerFactory.getLogger(Ckan2RdfModule.class);
@Parameter(urlPrefix = TYPE_URI + "/", name = "p-ckan-url", comment = "URL of the CKAN server.")
private String propCkanApiUrl;
@Parameter(urlPrefix = TYPE_URI + "/", name = "p-rdf4j-repository-url", comment = "URL of the RDF4J repository.")
private String propRdf4jRepositoryUrl;
// TODO - revise comment
@Parameter(urlPrefix = TYPE_URI + "/", name = "p-max-datasets", comment = "Limits the number of processed datasets.")
private Integer maxDatasets = Integer.MAX_VALUE;
private Resource createInstance(final String classIri, final Model m) {
final Resource instance = ResourceFactory.createResource(
classIri + "-" + Instant.now().toString());
final Resource clazz = ResourceFactory.createResource(classIri);
m.add(instance, RDF.type, clazz);
return instance;
}
private CkanDataset processDataset(EntityManager em, final String dataset, CkanClient client,
Resource indDescription, Resource indDatasetSnapshot) {
final Resource indDatasetSnapshotSub = createInstance(
NS_DDO + "dataset-snapshot",
executionContext.getDefaultModel());
executionContext.getDefaultModel().add(indDatasetSnapshot, ResourceFactory.createProperty(
NS_DDO + "has-sub-dataset-snapshot"), indDatasetSnapshotSub);
final Resource iDescriptionSub = createInstance(
NS_DDO + "description",
executionContext.getDefaultModel());
executionContext.getDefaultModel().add(indDescription, ResourceFactory.createProperty(
NS_DDO + "has-partial-description"), iDescriptionSub);
executionContext.getDefaultModel().add(iDescriptionSub, ResourceFactory.createProperty(
NS_DDO + "is-description-of"), indDatasetSnapshotSub);
CkanDataset ckanDataset = null;
try {
ckanDataset = client.getDataset(dataset);
executionContext.getDefaultModel().add(indDatasetSnapshotSub, DC.source,
ResourceFactory.createResource(ckanDataset.getIri()));
em.getTransaction().begin();
em.merge(ckanDataset,
new EntityDescriptor(URI.create(client.getCatalogUrl()))
);
em.getTransaction().commit();
return ckanDataset;
} catch (CkanException e) {
executionContext.getDefaultModel().add(iDescriptionSub, ResourceFactory.createProperty(
NS_DDO + "has-error-result"), e.getMessage());
LOG.warn("{}: Problem during dataset fetch {}", dataset, e.getMessage(), e);
}
return null;
}
private void processUser(EntityManager em, final CkanUser user, CkanClient client,
Resource indDescription, Resource indDatasetSnapshot) {
final Resource iDatasetSnapshotSub = createInstance(
NS_DDO + "dataset-snapshot", executionContext.getDefaultModel());
executionContext.getDefaultModel().add(indDatasetSnapshot, ResourceFactory.createProperty(
NS_DDO + "has-sub-dataset-snapshot"), iDatasetSnapshotSub);
executionContext.getDefaultModel().add(iDatasetSnapshotSub, DC.source,
ResourceFactory.createResource(user.getIri()));
final Resource iDescriptionSub = createInstance(
NS_DDO + "description", executionContext.getDefaultModel());
executionContext.getDefaultModel().add(indDescription, ResourceFactory.createProperty(
NS_DDO + "has-partial-description"), iDescriptionSub);
executionContext.getDefaultModel().add(iDescriptionSub, ResourceFactory.createProperty(
NS_DDO + "is-description-of"), iDatasetSnapshotSub);
em.getTransaction().begin();
em.merge(user,
new EntityDescriptor(URI.create(client.getCatalogUrl()))
);
em.getTransaction().commit();
}
@Override
ExecutionContext executeSelf() {
final Map<String, String> props = new HashMap<>();
props.put(JOPAPersistenceProperties.SCAN_PACKAGE, "eu.trentorise.opendata.jackan.model");
props.put(JOPAPersistenceProperties.ONTOLOGY_PHYSICAL_URI_KEY, propRdf4jRepositoryUrl);
PersistenceFactory.init(props);
final Resource iDescription = createInstance(
NS_DDO + "description", executionContext.getDefaultModel());
final Resource iDatasetSnapshot = createInstance(
NS_DDO + "dataset-snapshot", executionContext.getDefaultModel());
executionContext.getDefaultModel().add(iDescription, ResourceFactory.createProperty(
NS_DDO + "is-description-of"), iDatasetSnapshot);
executionContext.getDefaultModel().add(iDescription, DC.source,
ResourceFactory.createResource(propCkanApiUrl));
executionContext.getDefaultModel().add(ResourceFactory.createResource(propCkanApiUrl),
RDF.type, ResourceFactory.createResource(
"http://onto.fel.cvut.cz/ontologies/org/ckan/catalog"));
final EntityManager em = PersistenceFactory.createEntityManager();
try {
final CkanClient cc = new CkanClient(propCkanApiUrl);
final AtomicInteger i = new AtomicInteger();
i.set(0);
CkanCatalog catalog = new CkanCatalog();
catalog.setIri(cc.getCatalogUrl());
catalog.setDatasets(new HashSet<>());
List<String> datasets = new ArrayList<>();
try {
datasets = cc.getDatasetList();
} catch (CkanException e) {
LOG.warn("Problem during datasets fetch {}", e.getMessage(), e);
executionContext.getDefaultModel().add(iDescription, ResourceFactory.createProperty(
NS_DDO + "has-error-result"), e.getMessage());
}
int max = datasets.size();
for (final String dataset : datasets) {
LOG.info("Processing Dataset {} / {} - {}", i.incrementAndGet(), max, dataset);
CkanDataset ckanDataset = processDataset(em, dataset,
cc, iDescription, iDatasetSnapshot);
if (ckanDataset != null) {
catalog.getDatasets().add(ckanDataset);
if (i.get() > maxDatasets) {
LOG.info("Breaking execution {} / {} ", i.get(), maxDatasets);
break;
}
}
}
i.set(0);
List<CkanUser> userList = new ArrayList<>();
max = 0;
try {
userList = cc.getUserList();
} catch (CkanException e) {
executionContext.getDefaultModel().add(iDescription, ResourceFactory.createProperty(
NS_DDO + "has-error-result"), e.getMessage());
LOG.warn("Problem during userlist fetch {}", e.getMessage(), e);
}
max = userList.size();
for (final CkanUser user : userList) {
LOG.info("Processing User {} / {} - {}", i.incrementAndGet(), max, user.getId());
processUser(em, user, cc, iDescription, iDatasetSnapshot);
}
em.getTransaction().begin();
em.merge(catalog,
new EntityDescriptor(URI.create(cc.getCatalogUrl()))
);
em.getTransaction().commit();
} catch (final Exception e) {
executionContext.getDefaultModel().add(iDescription, ResourceFactory.createProperty(
NS_DDO + "has-error-result"), e.getMessage());
} finally {
em.close();
}
return executionContext;
}
@Override
public String getTypeURI() {
return TYPE_URI;
}
}