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package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.util.Collection;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.deser.impl.ObjectIdReader;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.util.AccessPattern;
/**
* Base class that simplifies implementations of {@link JsonDeserializer}s
* that mostly delegate functionality to another deserializer implementation
* (possibly forming a chaing of deserializers delegating functionality
* in some cases)
*
* @since 2.1
*/
public abstract class DelegatingDeserializer
extends StdDeserializer<Object>
implements ContextualDeserializer, ResolvableDeserializer
{
private static final long serialVersionUID = 1L;
protected final JsonDeserializer<?> _delegatee;
/*
/**********************************************************************
/* Construction
/**********************************************************************
*/
public DelegatingDeserializer(JsonDeserializer<?> d)
{
super(d.handledType());
_delegatee = d;
}
/*
/**********************************************************************
/* Abstract methods to implement
/**********************************************************************
*/
protected abstract JsonDeserializer<?> newDelegatingInstance(JsonDeserializer<?> newDelegatee);
/*
/**********************************************************************
/* Overridden methods for contextualization, resolving
/**********************************************************************
*/
@Override
public void resolve(DeserializationContext ctxt) throws JsonMappingException {
if (_delegatee instanceof ResolvableDeserializer) {
((ResolvableDeserializer) _delegatee).resolve(ctxt);
}
}
@Override
public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
BeanProperty property)
throws JsonMappingException
{
JavaType vt = ctxt.constructType(_delegatee.handledType());
JsonDeserializer<?> del = ctxt.handleSecondaryContextualization(_delegatee,
property, vt);
if (del == _delegatee) {
return this;
}
return newDelegatingInstance(del);
}
@Override
public JsonDeserializer<?> replaceDelegatee(JsonDeserializer<?> delegatee)
{
if (delegatee == _delegatee) {
return this;
}
return newDelegatingInstance(delegatee);
}
/*
/**********************************************************************
/* Overridden deserialization methods
/**********************************************************************
*/
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException
{
return _delegatee.deserialize(p, ctxt);
}
@SuppressWarnings("unchecked")
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt,
Object intoValue)
throws IOException
{
return ((JsonDeserializer<Object>)_delegatee).deserialize(p, ctxt, intoValue);
}
@Override
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException
{
return _delegatee.deserializeWithType(p, ctxt, typeDeserializer);
}
/*
/**********************************************************************
/* Overridden other methods
/**********************************************************************
*/
@Override
public boolean isCachable() { return _delegatee.isCachable(); }
@Override // since 2.9
public Boolean supportsUpdate(DeserializationConfig config) {
return _delegatee.supportsUpdate(config);
}
@Override
public JsonDeserializer<?> getDelegatee() {
return _delegatee;
}
@Override
public SettableBeanProperty findBackReference(String logicalName) {
// [databind#253]: Hope this works....
return _delegatee.findBackReference(logicalName);
}
@Override
public AccessPattern getNullAccessPattern() {
return _delegatee.getNullAccessPattern();
}
@Override
public Object getNullValue(DeserializationContext ctxt) throws JsonMappingException {
return _delegatee.getNullValue(ctxt);
}
@Override
public Object getEmptyValue(DeserializationContext ctxt) throws JsonMappingException {
return _delegatee.getEmptyValue(ctxt);
}
@Override
public Collection<Object> getKnownPropertyNames() { return _delegatee.getKnownPropertyNames(); }
@Override
public ObjectIdReader getObjectIdReader() { return _delegatee.getObjectIdReader(); }
}
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