com.fasterxml.jackson.databind.deser.CreatorProperty Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser;
import java.io.IOException;
import java.lang.annotation.Annotation;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.util.Annotations;
/**
* This concrete sub-class implements property that is passed
* via Creator (constructor or static factory method).
* It is not a full-featured implementation in that its set method
* should never be called -- instead, value must separately passed.
*
* Note on injectable values: unlike with other mutators, where
* deserializer and injecting are separate, here we treat the two as related
* things. This is necessary to add proper priority, as well as to simplify
* coordination.
*/
public class CreatorProperty
extends SettableBeanProperty
{
private static final long serialVersionUID = 1L;
/**
* Placeholder that represents constructor parameter, when it is created
* from actual constructor.
* May be null when a synthetic instance is created.
*/
protected final AnnotatedParameter _annotated;
/**
* Id of value to inject, if value injection should be used for this parameter
* (in addition to, or instead of, regular deserialization).
*/
protected final Object _injectableValueId;
/**
* @since 2.1
*/
protected final int _creatorIndex;
/**
* In special cases, when implementing "updateValue", we can not use
* constructors or factory methods, but have to fall back on using a
* setter (or mutable field property). If so, this refers to that fallback
* accessor.
*
* Mutable only to allow setting after construction, but must be strictly
* set before any use.
*
* @since 2.3
*/
protected SettableBeanProperty _fallbackSetter;
/**
* @param name Name of the logical property
* @param type Type of the property, used to find deserializer
* @param typeDeser Type deserializer to use for handling polymorphic type
* information, if one is needed
* @param contextAnnotations Contextual annotations (usually by class that
* declares creator [constructor, factory method] that includes
* this property)
* @param param Representation of property, constructor or factory
* method parameter; used for accessing annotations of the property
* @param index Index of this property within creator invocation
*
* @since 2.3
*/
public CreatorProperty(PropertyName name, JavaType type, PropertyName wrapperName,
TypeDeserializer typeDeser,
Annotations contextAnnotations, AnnotatedParameter param,
int index, Object injectableValueId,
PropertyMetadata metadata)
{
super(name, type, wrapperName, typeDeser, contextAnnotations, metadata);
_annotated = param;
_creatorIndex = index;
_injectableValueId = injectableValueId;
_fallbackSetter = null;
}
/**
* @since 2.3
*/
protected CreatorProperty(CreatorProperty src, PropertyName newName) {
super(src, newName);
_annotated = src._annotated;
_creatorIndex = src._creatorIndex;
_injectableValueId = src._injectableValueId;
_fallbackSetter = src._fallbackSetter;
}
protected CreatorProperty(CreatorProperty src, JsonDeserializer deser) {
super(src, deser);
_annotated = src._annotated;
_creatorIndex = src._creatorIndex;
_injectableValueId = src._injectableValueId;
_fallbackSetter = src._fallbackSetter;
}
@Override
public CreatorProperty withName(PropertyName newName) {
return new CreatorProperty(this, newName);
}
@Override
public CreatorProperty withValueDeserializer(JsonDeserializer deser) {
return new CreatorProperty(this, deser);
}
/**
* NOTE: one exception to immutability, due to problems with CreatorProperty instances
* being shared between Bean, separate PropertyBasedCreator
*
* @since 2.6.0
*/
public void setFallbackSetter(SettableBeanProperty fallbackSetter) {
_fallbackSetter = fallbackSetter;
}
/**
* Method that can be called to locate value to be injected for this
* property, if it is configured for this.
*/
public Object findInjectableValue(DeserializationContext context, Object beanInstance)
{
if (_injectableValueId == null) {
throw new IllegalStateException("Property '"+getName()
+"' (type "+getClass().getName()+") has no injectable value id configured");
}
return context.findInjectableValue(_injectableValueId, this, beanInstance);
}
/**
* Method to find value to inject, and inject it to this property.
*/
public void inject(DeserializationContext context, Object beanInstance)
throws IOException
{
set(beanInstance, findInjectableValue(context, beanInstance));
}
/*
/**********************************************************
/* BeanProperty impl
/**********************************************************
*/
@Override
public A getAnnotation(Class acls) {
if (_annotated == null) {
return null;
}
return _annotated.getAnnotation(acls);
}
@Override public AnnotatedMember getMember() { return _annotated; }
@Override public int getCreatorIndex() {
return _creatorIndex;
}
/*
/**********************************************************
/* Overridden methods
/**********************************************************
*/
@Override
public void deserializeAndSet(JsonParser jp, DeserializationContext ctxt,
Object instance)
throws IOException, JsonProcessingException
{
set(instance, deserialize(jp, ctxt));
}
@Override
public Object deserializeSetAndReturn(JsonParser jp,
DeserializationContext ctxt, Object instance)
throws IOException, JsonProcessingException
{
return setAndReturn(instance, deserialize(jp, ctxt));
}
@Override
public void set(Object instance, Object value) throws IOException
{
/* Hmmmh. Should we return quietly (NOP), or error?
* Perhaps better to throw an exception, since it's generally an error.
*/
if (_fallbackSetter == null) {
throw new IllegalStateException("No fallback setter/field defined: can not use creator property for "
+getClass().getName());
}
_fallbackSetter.set(instance, value);
}
@Override
public Object setAndReturn(Object instance, Object value) throws IOException
{
if (_fallbackSetter == null) {
throw new IllegalStateException("No fallback setter/field defined: can not use creator property for "
+getClass().getName());
}
return _fallbackSetter.setAndReturn(instance, value);
}
@Override
public Object getInjectableValueId() {
return _injectableValueId;
}
@Override
public String toString() { return "[creator property, name '"+getName()+"'; inject id '"+_injectableValueId+"']"; }
}