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com.fasterxml.jackson.databind.deser.AbstractDeserializer Maven / Gradle / Ivy
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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 = -3010349050434697698L;
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 jp, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException, JsonProcessingException
{
// Hmmh. One tricky question; for scalar, is it an Object Id, or "Natural" type?
// for now, prefer Object Id:
if (_objectIdReader != null) {
JsonToken t = jp.getCurrentToken();
// should be good enough check; we only care about Strings, integral numbers:
if (t != null && t.isScalarValue()) {
return _deserializeFromObjectId(jp, ctxt);
}
}
// First: support "natural" values (which are always serialized without type info!)
Object result = _deserializeIfNatural(jp, ctxt);
if (result != null) {
return result;
}
return typeDeserializer.deserializeTypedFromObject(jp, ctxt);
}
@Override
public Object deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// This method should never be called...
throw ctxt.instantiationException(_baseType.getRawClass(),
"abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information");
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
protected Object _deserializeIfNatural(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
/* As per [JACKSON-417], 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.
*/
/* 21-Sep-2013, tatu: It may seem odd that I'm not using a switch here.
* But turns out that a switch on an enum generates an inner class...
* crazy! So this is to avoid that, simply since new class weighs about 1kB
* after compression.
*/
final JsonToken t = jp.getCurrentToken();
if (t.isScalarValue()) {
if (t == JsonToken.VALUE_STRING) {
if (_acceptString) {
return jp.getText();
}
} else if (t == JsonToken.VALUE_NUMBER_INT) {
if (_acceptInt) {
return jp.getIntValue();
}
} else if (t == JsonToken.VALUE_NUMBER_FLOAT) {
if (_acceptDouble) {
return Double.valueOf(jp.getDoubleValue());
}
} else if (t == JsonToken.VALUE_TRUE) {
if (_acceptBoolean) {
return Boolean.TRUE;
}
} else if (t == JsonToken.VALUE_FALSE) {
if (_acceptBoolean) {
return Boolean.FALSE;
}
}
}
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 jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
Object id = _objectIdReader.readObjectReference(jp, ctxt);
ReadableObjectId roid = ctxt.findObjectId(id, _objectIdReader.generator);
// do we have it resolved?
Object pojo = roid.item;
if (pojo == null) { // not yet; should wait...
throw new IllegalStateException("Could not resolve Object Id ["+id+"] -- unresolved forward-reference?");
}
return pojo;
}
}
