package com.fasterxml.jackson.datatype.guava.deser;
import java.io.IOException;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.CollectionType;
public abstract class GuavaCollectionDeserializer<T>
extends StdDeserializer<T>
implements ContextualDeserializer
{
private static final long serialVersionUID = 1L;
protected final CollectionType _containerType;
Deserializer used for values contained in collection being deserialized;
either assigned on constructor, or during resolve().
/**
* 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
/**
* 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.
/**
* 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.
/**
* Method called to finalize setup of this deserializer,
* after deserializer itself has been registered. This
* is needed to handle recursive and transitive dependencies.
*/
@Override
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.
/**
* 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 p, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException
{
return typeDeserializer.deserializeTypedFromArray(p, ctxt);
}
@SuppressWarnings("unchecked")
@Override
public T deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException
{
// Should usually point to START_ARRAY
if (p.isExpectedStartArrayToken()) {
return _deserializeContents(p, ctxt);
}
// But may support implicit arrays from single values?
if (ctxt.isEnabled(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)) {
return _deserializeFromSingleValue(p, ctxt);
}
return (T) ctxt.handleUnexpectedToken(_valueClass, p);
}
/*
/**********************************************************************
/* Abstract methods for impl classes
/**********************************************************************
*/
protected abstract T _deserializeContents(JsonParser p, DeserializationContext ctxt)
throws IOException;
Method used to support implicit coercion from a single non-array value
into single-element collection.
Since: 2.3
/**
* Method used to support implicit coercion from a single non-array value
* into single-element collection.
*
* @since 2.3
*/
protected abstract T _deserializeFromSingleValue(JsonParser p, DeserializationContext ctxt)
throws IOException;
}