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PropertiesTraverser.java
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PropertiesTraverser.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* 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.
*
* 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.jsonld.serialization.traversal;
import cz.cvut.kbss.jsonld.common.BeanAnnotationProcessor;
import cz.cvut.kbss.jsonld.common.BeanClassProcessor;
import cz.cvut.kbss.jsonld.serialization.context.JsonLdContext;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
/**
* Serializes a {@link cz.cvut.kbss.jopa.model.annotations.Properties} field.
* <p>
* Note that at the moment, when the map also contains a property which is already mapped by another field, a conflict in
* the resulting JSON-LD will arise.
*/
class PropertiesTraverser {
private final ObjectGraphTraverser parent;
PropertiesTraverser(ObjectGraphTraverser parent) {
this.parent = parent;
}
public void traverseProperties(SerializationContext<Map<?, ?>> ctx) {
for (Map.Entry<?, ?> e : ctx.getValue().entrySet()) {
final String property = e.getKey().toString();
if (e.getValue() == null) {
continue;
}
if (e.getValue() instanceof Collection) {
final Collection<?> propertyValues = (Collection<?>) e.getValue();
serializePropertyValues(property, propertyValues, ctx.getJsonLdContext());
} else {
visitSingleValue(property, e.getValue(), ctx.getJsonLdContext());
}
}
}
private void visitSingleValue(String property, Object value, JsonLdContext jsonLdContext) {
assert value != null;
if (isTraversable(value)) {
parent.traverseSingular(new SerializationContext<>(property, value, jsonLdContext));
} else {
parent.visitAttribute(new SerializationContext<>(property, value, jsonLdContext));
}
}
private static boolean isTraversable(Object value) {
final Class<?> cls = value.getClass();
return (BeanClassProcessor.isIdentifierType(value.getClass()) && !String.class.equals(cls)) ||
BeanAnnotationProcessor.isOwlClassEntity(value.getClass()) ||
BeanAnnotationProcessor.hasTypesField(cls);
}
private void serializePropertyValues(String property, Collection<?> values, JsonLdContext jsonLdContext) {
if (values.isEmpty()) {
return;
}
if (values.size() == 1) {
final Object val = values.iterator().next();
if (val != null) {
visitSingleValue(property, val, jsonLdContext);
}
} else {
final SerializationContext<Collection<?>> colContext = new SerializationContext<>(property, values, jsonLdContext);
parent.openCollection(colContext);
values.stream().filter(Objects::nonNull).forEach(v -> visitSingleValue(null, v, jsonLdContext));
parent.closeCollection(colContext);
}
}
}