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nl.open.jwtdependency.com.fasterxml.jackson.databind.deser.AbstractDeserializer Maven / Gradle / Ivy
This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).
package com.fasterxml.jackson.databind.deser;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.impl.ObjectIdReader;
import com.fasterxml.jackson.databind.deser.impl.ReadableObjectId;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
/**
* Deserializer only used for abstract types used as placeholders during polymorphic
* type handling deserialization. If so, there is no real deserializer associated
* with nominal type, just {@link TypeDeserializer}; and any calls that do not
* pass such resolver will result in an error.
*/
public class AbstractDeserializer
extends JsonDeserializer
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
protected final JavaType _baseType;
protected final ObjectIdReader _objectIdReader;
protected final Map _backRefProperties;
// support for "native" types, which require special care:
protected final boolean _acceptString;
protected final boolean _acceptBoolean;
protected final boolean _acceptInt;
protected final boolean _acceptDouble;
public AbstractDeserializer(BeanDeserializerBuilder builder,
BeanDescription beanDesc, Map backRefProps)
{
_baseType = beanDesc.getType();
_objectIdReader = builder.getObjectIdReader();
_backRefProperties = backRefProps;
Class cls = _baseType.getRawClass();
_acceptString = cls.isAssignableFrom(String.class);
_acceptBoolean = (cls == Boolean.TYPE) || cls.isAssignableFrom(Boolean.class);
_acceptInt = (cls == Integer.TYPE) || cls.isAssignableFrom(Integer.class);
_acceptDouble = (cls == Double.TYPE) || cls.isAssignableFrom(Double.class);
}
protected AbstractDeserializer(BeanDescription beanDesc)
{
_baseType = beanDesc.getType();
_objectIdReader = null;
_backRefProperties = null;
Class cls = _baseType.getRawClass();
_acceptString = cls.isAssignableFrom(String.class);
_acceptBoolean = (cls == Boolean.TYPE) || cls.isAssignableFrom(Boolean.class);
_acceptInt = (cls == Integer.TYPE) || cls.isAssignableFrom(Integer.class);
_acceptDouble = (cls == Double.TYPE) || cls.isAssignableFrom(Double.class);
}
/**
* Factory method used when constructing instances for non-POJO types, like
* {@link java.util.Map}s.
*
* @since 2.3
*/
public static AbstractDeserializer constructForNonPOJO(BeanDescription beanDesc) {
return new AbstractDeserializer(beanDesc);
}
/*
/**********************************************************
/* Public accessors
/**********************************************************
*/
@Override
public Class handledType() {
return _baseType.getRawClass();
}
@Override
public boolean isCachable() { return true; }
/**
* Overridden to return true for those instances that are
* handling value for which Object Identity handling is enabled
* (either via value type or referring property).
*/
@Override
public ObjectIdReader getObjectIdReader() {
return _objectIdReader;
}
/**
* Method called by BeanDeserializer to resolve back reference
* part of managed references.
*/
@Override
public SettableBeanProperty findBackReference(String logicalName) {
return (_backRefProperties == null) ? null : _backRefProperties.get(logicalName);
}
/*
/**********************************************************
/* Deserializer implementation
/**********************************************************
*/
@Override
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException
{
// Hmmh. One tricky question; for scalar, is it an Object Id, or "Natural" type?
// for now, prefer Object Id:
if (_objectIdReader != null) {
JsonToken t = p.getCurrentToken();
if (t != null) {
// Most commonly, a scalar (int id, uuid String, ...)
if (t.isScalarValue()) {
return _deserializeFromObjectId(p, ctxt);
}
// but, with 2.5+, a simple Object-wrapped value also legal:
if (t == JsonToken.START_OBJECT) {
t = p.nextToken();
}
if ((t == JsonToken.FIELD_NAME) && _objectIdReader.maySerializeAsObject()
&& _objectIdReader.isValidReferencePropertyName(p.getCurrentName(), p)) {
return _deserializeFromObjectId(p, ctxt);
}
}
}
// First: support "natural" values (which are always serialized without type info!)
Object result = _deserializeIfNatural(p, ctxt);
if (result != null) {
return result;
}
return typeDeserializer.deserializeTypedFromObject(p, ctxt);
}
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException
{
return ctxt.handleMissingInstantiator(_baseType.getRawClass(), p,
"abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information");
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
protected Object _deserializeIfNatural(JsonParser p, DeserializationContext ctxt) throws IOException
{
/* There is a chance we might be "natural" types
* (String, Boolean, Integer, Double), which do not include any type information...
* Care must be taken to only return this if return type matches, however.
* Finally, we may have to consider possibility of custom handlers for
* these values: but for now this should work ok.
*/
switch (p.getCurrentTokenId()) {
case JsonTokenId.ID_STRING:
if (_acceptString) {
return p.getText();
}
break;
case JsonTokenId.ID_NUMBER_INT:
if (_acceptInt) {
return p.getIntValue();
}
break;
case JsonTokenId.ID_NUMBER_FLOAT:
if (_acceptDouble) {
return Double.valueOf(p.getDoubleValue());
}
break;
case JsonTokenId.ID_TRUE:
if (_acceptBoolean) {
return Boolean.TRUE;
}
break;
case JsonTokenId.ID_FALSE:
if (_acceptBoolean) {
return Boolean.FALSE;
}
break;
}
return null;
}
/**
* Method called in cases where it looks like we got an Object Id
* to parse and use as a reference.
*/
protected Object _deserializeFromObjectId(JsonParser p, DeserializationContext ctxt) throws IOException
{
Object id = _objectIdReader.readObjectReference(p, ctxt);
ReadableObjectId roid = ctxt.findObjectId(id, _objectIdReader.generator, _objectIdReader.resolver);
// do we have it resolved?
Object pojo = roid.resolve();
if (pojo == null) { // not yet; should wait...
throw new UnresolvedForwardReference(p,
"Could not resolve Object Id ["+id+"] -- unresolved forward-reference?", p.getCurrentLocation(), roid);
}
return pojo;
}
}
