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JaVers - object auditing and diff framework for Java
package org.javers.guava;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.Multiset;
import com.google.gson.*;
import org.javers.common.reflection.ReflectionUtil;
import org.javers.common.validation.Validate;
import org.javers.core.json.JsonAdvancedTypeAdapter;
import java.lang.reflect.Type;
import java.util.List;
/**
* @author bartosz.walacik
*/
class MultisetTypeAdapter implements JsonAdvancedTypeAdapter {
@Override
public Multiset fromJson(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
JsonArray jsonArray = (JsonArray) json;
List mapTypeArguments = ReflectionUtil.getAllTypeArguments(typeOfT);
Validate.conditionFulfilled(mapTypeArguments.size() == 1,
"expected exactly one type parameters in Multiset "+ typeOfT);
Multiset multiset = HashMultiset.create();
jsonArray.forEach(e -> {
Object entry = context.deserialize(e, mapTypeArguments.get(0));
multiset.add(entry);
});
return multiset;
}
@Override
public JsonElement toJson(Multiset sourceValue, Type typeOfT, JsonSerializationContext context) {
JsonArray jsonArray = new JsonArray();
sourceValue.forEach(e -> {
jsonArray.add(context.serialize(e));
});
return jsonArray;
}
@Override
public Class getTypeSuperclass() {
return Multiset.class;
}
}