package com.facebook.presto.jdbc.internal.jackson.datatype.guava.deser;
import java.io.IOException;
import com.facebook.presto.jdbc.internal.jackson.core.JsonParser;
import com.facebook.presto.jdbc.internal.jackson.core.JsonProcessingException;
import com.facebook.presto.jdbc.internal.jackson.core.JsonToken;
import com.facebook.presto.jdbc.internal.jackson.databind.DeserializationContext;
import com.facebook.presto.jdbc.internal.jackson.databind.JsonDeserializer;
import com.facebook.presto.jdbc.internal.jackson.databind.jsontype.TypeDeserializer;
import com.facebook.presto.jdbc.internal.jackson.databind.type.CollectionType;
import com.facebook.presto.jdbc.internal.guava.collect.ImmutableCollection;
abstract class GuavaImmutableCollectionDeserializer<T extends ImmutableCollection<Object>>
extends GuavaCollectionDeserializer<T> {
GuavaImmutableCollectionDeserializer(CollectionType type,
TypeDeserializer typeDeser, JsonDeserializer<?> deser) {
super(type, typeDeser, deser);
}
protected abstract ImmutableCollection.Builder<Object> createBuilder();
@Override
protected T _deserializeContents(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException {
JsonDeserializer<?> valueDes = _valueDeserializer;
JsonToken t;
final TypeDeserializer typeDeser = _typeDeserializerForValue;
// No way to pass actual type parameter; but does not matter, just
// compiler-time fluff:
ImmutableCollection.Builder<Object> builder = createBuilder();
while ((t = jp.nextToken()) != JsonToken.END_ARRAY) {
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else if (typeDeser == null) {
value = valueDes.deserialize(jp, ctxt);
} else {
value = valueDes.deserializeWithType(jp, ctxt, typeDeser);
}
builder.add(value);
}
// No class outside of the package will be able to subclass us,
// and we provide the proper builder for the subclasses we implement.
@SuppressWarnings("unchecked")
T collection = (T) builder.build();
return collection;
}
}