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CollectionDeserializer.java
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CollectionDeserializer.java
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/**
* Copyright (C) 2017 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.jsonld.deserialization.expanded;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.deserialization.InstanceBuilder;
import cz.cvut.kbss.jsonld.deserialization.util.XSDTypeCoercer;
import cz.cvut.kbss.jsonld.exception.MissingIdentifierException;
import java.net.URI;
import java.util.List;
import java.util.Map;
class CollectionDeserializer extends Deserializer<List<?>> {
private final String property;
CollectionDeserializer(InstanceBuilder instanceBuilder, DeserializerConfig config, String property) {
super(instanceBuilder, config);
this.property = property;
}
@Override
void processValue(List<?> value) {
if (value.size() == 1 && value.get(0) instanceof Map) {
final Map<?, ?> map = (Map<?, ?>) value.get(0);
if (!instanceBuilder.isPlural(property)) {
resolvePropertyValue(map);
return;
}
if (map.size() == 1 && map.containsKey(JsonLd.LIST)) {
assert map.get(JsonLd.LIST) instanceof List;
processValue((List<?>) map.get(JsonLd.LIST));
return;
}
}
instanceBuilder.openCollection(property);
for (Object item : value) {
if (item instanceof Map) {
resolveValue((Map<?, ?>) item);
} else {
instanceBuilder.addValue(item);
}
}
instanceBuilder.closeCollection();
}
private void resolveValue(Map<?, ?> value) {
if (value.size() == 1 && value.containsKey(JsonLd.VALUE)) {
instanceBuilder.addValue(value.get(JsonLd.VALUE));
} else if (value.size() == 1 && value.containsKey(JsonLd.ID)) {
instanceBuilder.addNodeReference(value.get(JsonLd.ID).toString());
} else if (instanceBuilder.isCurrentCollectionProperties()) {
// If we are deserializing an object into @Properties, just extract the identifier and put it into the map
if (!value.containsKey(JsonLd.ID)) {
throw new MissingIdentifierException(
"Cannot put an object without an identifier into @Properties. Object: " + value);
}
instanceBuilder.addValue(URI.create(value.get(JsonLd.ID).toString()));
} else {
final Class<?> elementType = instanceBuilder.getCurrentCollectionElementType();
new ObjectDeserializer(instanceBuilder, config, elementType).processValue(value);
}
}
private void resolvePropertyValue(Map<?, ?> value) {
if (value.containsKey(JsonLd.VALUE)) {
extractLiteralValue(value);
} else if (value.size() == 1 && value.containsKey(JsonLd.ID)) {
instanceBuilder.addNodeReference(property, value.get(JsonLd.ID).toString());
} else {
new ObjectDeserializer(instanceBuilder, config, property).processValue(value);
}
}
private void extractLiteralValue(Map<?, ?> value) {
final Object val = value.get(JsonLd.VALUE);
if (val instanceof String && value.containsKey(JsonLd.TYPE)) {
instanceBuilder.addValue(property, XSDTypeCoercer.coerceType(val.toString(), value.get(JsonLd.TYPE).toString()));
} else {
instanceBuilder.addValue(property, val);
}
}
}