package com.facebook.presto.jdbc.internal.jackson.datatype.guava.deser;
import java.io.IOException;
import com.facebook.presto.jdbc.internal.jackson.core.*;
import com.facebook.presto.jdbc.internal.jackson.databind.*;
import com.facebook.presto.jdbc.internal.jackson.databind.deser.ContextualDeserializer;
import com.facebook.presto.jdbc.internal.jackson.databind.deser.std.StdDeserializer;
import com.facebook.presto.jdbc.internal.jackson.databind.jsontype.TypeDeserializer;
import com.facebook.presto.jdbc.internal.jackson.databind.type.CollectionType;
public abstract class GuavaCollectionDeserializer<T>
extends StdDeserializer<T>
implements ContextualDeserializer
{
protected final CollectionType _containerType;
/**
* Deserializer used for values contained in collection being deserialized;
* either assigned on constructor, or during resolve().
*/
protected final JsonDeserializer<?> _valueDeserializer;
/**
* If value instances have polymorphic type information, this
* is the type deserializer that can deserialize required type
* information
*/
protected final TypeDeserializer _typeDeserializerForValue;
protected GuavaCollectionDeserializer(CollectionType type,
TypeDeserializer typeDeser, JsonDeserializer<?> deser)
{
super(type);
_containerType = type;
_typeDeserializerForValue = typeDeser;
_valueDeserializer = deser;
}
/**
* Overridable fluent factory method used for creating contextual
* instances.
*/
public abstract GuavaCollectionDeserializer<T> withResolved(
TypeDeserializer typeDeser, JsonDeserializer<?> valueDeser);
/*
/**********************************************************
/* Validation, post-processing
/**********************************************************
*/
/**
* Method called to finalize setup of this deserializer,
* after deserializer itself has been registered. This
* is needed to handle recursive and transitive dependencies.
*/
public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
JsonDeserializer<?> deser = _valueDeserializer;
TypeDeserializer typeDeser = _typeDeserializerForValue;
if (deser == null) {
deser = ctxt.findContextualValueDeserializer(_containerType.getContentType(), property);
}
if (typeDeser != null) {
typeDeser = typeDeser.forProperty(property);
}
if (deser == _valueDeserializer && typeDeser == _typeDeserializerForValue) {
return this;
}
return withResolved(typeDeser, deser);
}
/*
/**********************************************************
/* Deserialization interface
/**********************************************************
*/
/**
* Base implementation that does not assume specific type
* inclusion mechanism. Sub-classes are expected to override
* this method if they are to handle type information.
*/
@Override
public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException, JsonProcessingException
{
return typeDeserializer.deserializeTypedFromArray(jp, ctxt);
}
@Override
public T deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// Ok: must point to START_ARRAY
if (jp.getCurrentToken() != JsonToken.START_ARRAY) {
throw ctxt.mappingException(_containerType.getRawClass());
}
return _deserializeContents(jp, ctxt);
}
/*
/**********************************************************************
/* Abstract methods for impl classes
/**********************************************************************
*/
protected abstract T _deserializeContents(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException;
}