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PropertiesFieldStrategy.java
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PropertiesFieldStrategy.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.oom;
import cz.cvut.kbss.jopa.CommonVocabulary;
import cz.cvut.kbss.jopa.exceptions.InvalidAssertionIdentifierException;
import cz.cvut.kbss.jopa.model.IRI;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.Attribute;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.PropertiesSpecification;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.ontodriver.model.Assertion;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import cz.cvut.kbss.ontodriver.model.Value;
import java.net.URI;
import java.util.*;
import java.util.Map.Entry;
import java.util.stream.Collectors;
public class PropertiesFieldStrategy<X> extends FieldStrategy<PropertiesSpecification<? super X, ?, ?, ?>, X> {
private final PropertiesValueHolder value = new PropertiesValueHolder();
PropertiesFieldStrategy(EntityType<X> et, PropertiesSpecification<? super X, ?, ?, ?> att,
Descriptor descriptor, EntityMappingHelper mapper) {
super(et, att, descriptor, mapper);
}
@Override
void addValueFromAxiom(Axiom<?> ax) {
if (shouldSkipAxiom(ax)) {
return;
}
value.addValue(ax);
}
private boolean shouldSkipAxiom(Axiom<?> ax) {
final String property = ax.getAssertion().getIdentifier().toString();
// This is class assertion for entities without types
return property.equals(CommonVocabulary.RDF_TYPE) || isMappedAttribute(ax);
}
private boolean isMappedAttribute(Axiom<?> ax) {
// TODO This is too simple, in case the assertion corresponds to a mapped attribute,
// we also have to check whether the map is suitable for the attribute. If not, it belongs to properties
final IRI propertyAsIri = IRI.create(ax.getAssertion().getIdentifier().toString());
for (Attribute<?, ?> att : et.getAttributes()) {
if (att.getIRI().equals(propertyAsIri)) {
return true;
}
}
return false;
}
@Override
void buildInstanceFieldValue(Object instance) throws IllegalAccessException {
if (value.getValue().isEmpty()) {
return;
}
setValueOnInstance(instance, value.getValue());
}
@Override
void buildAxiomValuesFromInstance(X instance, AxiomValueGatherer valueBuilder) throws IllegalAccessException {
final Object val = extractFieldValueFromInstance(instance);
final X original = mapper.getOriginalInstance(instance);
if (val == null) {
if (original == null) {
return;
}
final Map<?, Set<?>> origProps = (Map<?, Set<?>>) extractFieldValueFromInstance(original);
if (origProps == null || origProps.isEmpty()) {
return;
}
valueBuilder.removeProperties(prepareProperties(origProps), getAttributeContext());
return;
}
assert val instanceof Map;
final Map<?, Set<?>> props = (Map<?, Set<?>>) val;
if (original == null) {
valueBuilder.addProperties(prepareProperties(props), getAttributeContext());
} else {
final Map<?, Set<?>> origProps = (Map<?, Set<?>>) extractFieldValueFromInstance(original);
final Map<Assertion, Set<Value<?>>> toRemove = resolvePropertiesToRemove(props, origProps);
if (!toRemove.isEmpty()) {
valueBuilder.removeProperties(toRemove, getAttributeContext());
}
final Map<Assertion, Set<Value<?>>> toAdd = resolvePropertiesToAdd(props, origProps);
if (!toAdd.isEmpty()) {
valueBuilder.addProperties(toAdd, getAttributeContext());
}
}
}
private Map<Assertion, Set<Value<?>>> prepareProperties(Map<?, Set<?>> props) {
final Map<Assertion, Set<Value<?>>> result = new HashMap<>(props.size());
props.entrySet().stream().filter(e -> e.getKey() != null && e.getValue() != null)
.forEach(e -> result.put(propertyToAssertion(e.getKey()), objectsToValues(e.getValue())));
return result;
}
private Assertion propertyToAssertion(Object property) {
try {
return Assertion
.createPropertyAssertion(EntityPropertiesUtils.getValueAsURI(property), attribute.isInferred());
} catch (IllegalArgumentException e) {
throw new InvalidAssertionIdentifierException(property + " is not a valid identifier.", e);
}
}
private Set<Value<?>> objectsToValues(Collection<?> strValues) {
final Set<Value<?>> ontoValues = new HashSet<>(strValues.size());
ontoValues.addAll(strValues.stream().filter(v -> v != null).map(Value::new).collect(Collectors.toList()));
return ontoValues;
}
private Map<Assertion, Set<Value<?>>> resolvePropertiesToRemove(Map<?, Set<?>> current, Map<?, Set<?>> original) {
return propertyDiff(original, current);
}
/**
* The difference is counted as the properties and values which were in base but are not in the updated version.
*/
private Map<Assertion, Set<Value<?>>> propertyDiff(Map<?, Set<?>> base, Map<?, Set<?>> updated) {
if (base == null || base.isEmpty()) {
return Collections.emptyMap();
}
final Map<Assertion, Set<Value<?>>> diff = new HashMap<>();
if (updated == null || updated.isEmpty()) {
diff.putAll(createAssertionsForAll(base));
} else {
for (Entry<?, Set<?>> entry : base.entrySet()) {
final Object key = entry.getKey();
if (!updated.containsKey(key) || updated.get(key) == null || updated.get(key).isEmpty()) {
// All values of the property are missing
diff.put(propertyToAssertion(key), objectsToValues(entry.getValue()));
} else {
final Set<?> currentValues = updated.get(key);
// Check which property values are missing
final List<?> removed =
entry.getValue().stream().filter(origVal -> !currentValues.contains(origVal))
.collect(Collectors.toList());
if (!removed.isEmpty()) {
diff.put(propertyToAssertion(key), objectsToValues(removed));
}
}
}
}
return diff;
}
private Map<Assertion, Set<Value<?>>> createAssertionsForAll(Map<?, Set<?>> map) {
final Map<Assertion, Set<Value<?>>> diff = new HashMap<>(map.size());
map.forEach((key, value) -> diff.put(propertyToAssertion(key), objectsToValues(value)));
return diff;
}
private Map<Assertion, Set<Value<?>>> resolvePropertiesToAdd(Map<?, Set<?>> current, Map<?, Set<?>> original) {
return propertyDiff(current, original);
}
@Override
Assertion createAssertion() {
return Assertion.createUnspecifiedPropertyAssertion(attribute.isInferred());
}
private class PropertiesValueHolder {
// TODO Make this class more generic, the if/else conditions for property id and value are not a good solution
private final Map<Object, Set<Object>> map = new HashMap<>();
void addValue(Axiom<?> ax) {
final Object property = mapPropertyIdentifier(ax.getAssertion());
final Object value = mapPropertyValue(ax.getValue());
if (!map.containsKey(property)) {
map.put(property, new HashSet<>());
}
map.get(property).add(value);
}
private Object mapPropertyIdentifier(Assertion a) {
final URI id = a.getIdentifier();
final Class<?> propertyIdType = PropertiesFieldStrategy.this.attribute.getPropertyIdentifierType();
if (propertyIdType.isAssignableFrom(id.getClass())) {
return id;
} else {
if (propertyIdType.equals(String.class)) {
return id.toString();
} else {
throw new InvalidAssertionIdentifierException("URI cannot be mapped to type " + propertyIdType);
}
}
}
private Object mapPropertyValue(Value<?> value) {
final Class<?> propertyValueType = PropertiesFieldStrategy.this.attribute.getPropertyValueType();
Object val = value.getValue();
if (val.getClass().equals(NamedResource.class)) {
val = ((NamedResource) val).getIdentifier();
}
if (propertyValueType.isAssignableFrom(val.getClass())) {
return val;
} else {
if (propertyValueType.equals(String.class)) {
return val.toString();
} else {
throw new IllegalArgumentException("Invalid property value type " + propertyValueType);
}
}
}
Map<Object, Set<Object>> getValue() {
return map;
}
}
}