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com.fasterxml.jackson.module.afterburner.deser.SuperSonicBeanDeserializer Maven / Gradle / Ivy
Jackson (https://github.com/FasterXML/jackson) extension module
used to enhance performance using bytecode generation to replace use of Reflection for
field access and method calls
package com.fasterxml.jackson.module.afterburner.deser;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.io.SerializedString;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.util.NameTransformer;
public final class SuperSonicBeanDeserializer extends BeanDeserializer
{
private static final long serialVersionUID = 1;
/**
* Names of properties being deserialized, in ordered they are
* expected to have been written (as per serialization settings);
* used for speculative order-based optimizations
*/
protected final SerializedString[] _orderedPropertyNames;
/**
* Properties matching names in {@link #_orderedPropertyNames},
* assigned after resolution when property instances are finalized.
*/
protected SettableBeanProperty[] _orderedProperties;
/*
/**********************************************************
/* Life-cycle, construction, initialization
/**********************************************************
*/
public SuperSonicBeanDeserializer(BeanDeserializer src, List props)
{
super(src);
final int len = props.size();
_orderedPropertyNames = new SerializedString[len];
for (int i = 0; i < len; ++i) {
_orderedPropertyNames[i] = new SerializedString(props.get(i).getName());
}
}
protected SuperSonicBeanDeserializer(SuperSonicBeanDeserializer src, NameTransformer unwrapper)
{
super(src, unwrapper);
_orderedProperties = src._orderedProperties;
_orderedPropertyNames = src._orderedPropertyNames;
}
@Override
public JsonDeserializer unwrappingDeserializer(NameTransformer unwrapper) {
return new SuperSonicBeanDeserializer(this, unwrapper);
}
// // Others, let's just leave as is; will not be optimized?
//public BeanDeserializer withObjectIdReader(ObjectIdReader oir) {
//public BeanDeserializer withIgnorableProperties(HashSet ignorableProps)
//protected BeanDeserializerBase asArrayDeserializer()
/*
/**********************************************************
/* BenaDeserializer overrides
/**********************************************************
*/
/**
* This method is overridden as we need to know expected order of
* properties.
*/
@Override
public void resolve(DeserializationContext ctxt)
throws JsonMappingException
{
super.resolve(ctxt);
/* Ok, now; need to find actual property instances to go with order
* defined based on property names.
*/
/* 20-Sep-2014, tatu: As per [Afterburner#43], use of `JsonTypeInfo.As.EXTERNAL_PROPERTY`
* will "hide" matching property, leading to no match below.
* But since we don't use optimized path if that case, let's just bail out.
*/
if (_externalTypeIdHandler != null || _unwrappedPropertyHandler != null) {
// should we assign empty array or... ?
return;
}
int len = _orderedPropertyNames.length;
ArrayList props = new ArrayList(len);
int i = 0;
for (; i < len; ++i) {
SettableBeanProperty prop = _beanProperties.find(_orderedPropertyNames[i].toString());
if (prop != null) {
props.add(prop);
}
}
// should usually get at least one property; let's for now consider it an error if not
// (may need to revisit in future)
if (i == 0) {
throw new IllegalStateException("Afterburner internal error: BeanDeserializer for "
+_beanType+" has no properties that match expected ordering (should have "+len+") -- can not create optimized deserializer");
}
_orderedProperties = props.toArray(new SettableBeanProperty[props.size()]);
}
@Override
public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
{
if (!_vanillaProcessing || (_objectIdReader != null)) {
// should we ever get here? Just in case
return super.deserialize(p, ctxt);
}
// common case first:
if (!p.isExpectedStartObjectToken()) {
return _deserializeOther(p, ctxt, p.getCurrentToken());
}
if (_nonStandardCreation) {
p.nextToken();
if (_unwrappedPropertyHandler != null) {
return deserializeWithUnwrapped(p, ctxt);
}
if (_externalTypeIdHandler != null) {
return deserializeWithExternalTypeId(p, ctxt);
}
Object bean = deserializeFromObjectUsingNonDefault(p, ctxt);
if (_injectables != null) {
injectValues(ctxt, bean);
}
return bean;
}
final Object bean = _valueInstantiator.createUsingDefault(ctxt);
// [databind#631]: Assign current value, to be accessible by custom serializers
p.setCurrentValue(bean);
if (p.canReadObjectId()) {
Object id = p.getObjectId();
if (id != null) {
_handleTypedObjectId(p, ctxt, bean, id);
}
}
if (_injectables != null) {
injectValues(ctxt, bean);
}
for (int i = 0, len = _orderedProperties.length; i < len; ++i) {
SettableBeanProperty prop = _orderedProperties[i];
if (!p.nextFieldName(_orderedPropertyNames[i])) { // miss...
if (p.getCurrentToken() == JsonToken.END_OBJECT) {
return bean;
}
// we likely point to FIELD_NAME, so can just call parent impl
return super.deserialize(p, ctxt, bean);
}
p.nextToken(); // skip field, returns value token
try {
prop.deserializeAndSet(p, ctxt, bean);
} catch (Exception e) {
wrapAndThrow(e, bean, prop.getName(), ctxt);
}
}
// also, need to ensure we get closing END_OBJECT...
if (p.nextToken() != JsonToken.END_OBJECT) {
return super.deserialize(p, ctxt, bean);
}
return bean;
}
// much of below is cut'n pasted from BeanSerializer
@Override
public final Object deserialize(JsonParser p, DeserializationContext ctxt, Object bean)
throws IOException
{
// [databind#631]: Assign current value, to be accessible by custom serializers
p.setCurrentValue(bean);
if (_injectables != null) {
injectValues(ctxt, bean);
}
if (_unwrappedPropertyHandler != null) {
return deserializeWithUnwrapped(p, ctxt, bean);
}
if (_externalTypeIdHandler != null) {
return deserializeWithExternalTypeId(p, ctxt, bean);
}
SettableBeanProperty prop = _orderedProperties[0];
// First: verify that first name is expected
if (p.isExpectedStartObjectToken()) {
if (!p.nextFieldName(_orderedPropertyNames[0])) {
return super.deserialize(p, ctxt, bean);
}
} else if (!p.hasToken(JsonToken.FIELD_NAME)
|| !prop.getName().equals(p.getCurrentName())) {
// no, something funky, use base impl for special cases
return super.deserialize(p, ctxt, bean);
}
p.nextToken();
try {
prop.deserializeAndSet(p, ctxt, bean);
} catch (Exception e) {
wrapAndThrow(e, bean, prop.getName(), ctxt);
}
// then rest of properties
for (int i = 1, len = _orderedProperties.length; i < len; ++i) {
if (!p.nextFieldName(_orderedPropertyNames[i])) { // miss...
if (p.hasToken(JsonToken.END_OBJECT)) {
return bean;
}
// we likely point to FIELD_NAME, so can just call parent impl
return super.deserialize(p, ctxt, bean);
}
prop = _orderedProperties[i];
p.nextToken(); // skip field, returns value token
try {
prop.deserializeAndSet(p, ctxt, bean);
} catch (Exception e) {
wrapAndThrow(e, bean, prop.getName(), ctxt);
}
}
// also, need to ensure we get closing END_OBJECT...
if (p.nextToken() != JsonToken.END_OBJECT) {
return super.deserialize(p, ctxt, bean);
}
return bean;
}
// much of below is cut'n pasted from BeanSerializer
@Override
public final Object deserializeFromObject(JsonParser p, DeserializationContext ctxt) throws IOException
{
// See BeanDeserializer.deserializeFromObject [databind#622]
// Allow Object Id references to come in as JSON Objects as well...
if ((_objectIdReader != null) && _objectIdReader.maySerializeAsObject()) {
if (p.hasTokenId(JsonTokenId.ID_FIELD_NAME)
&& _objectIdReader.isValidReferencePropertyName(p.getCurrentName(), p)) {
return deserializeFromObjectId(p, ctxt);
}
}
if (_nonStandardCreation) {
if (_unwrappedPropertyHandler != null) {
return deserializeWithUnwrapped(p, ctxt);
}
if (_externalTypeIdHandler != null) {
return deserializeWithExternalTypeId(p, ctxt);
}
Object bean = deserializeFromObjectUsingNonDefault(p, ctxt);
if (_injectables != null) {
injectValues(ctxt, bean);
}
return bean;
}
final Object bean = _valueInstantiator.createUsingDefault(ctxt);
// [databind#631]: Assign current value, to be accessible by custom serializers
p.setCurrentValue(bean);
if (p.canReadObjectId()) {
Object id = p.getObjectId();
if (id != null) {
_handleTypedObjectId(p, ctxt, bean, id);
}
}
if (_injectables != null) {
injectValues(ctxt, bean);
}
SettableBeanProperty prop = _orderedProperties[0];
// First: verify that first name is expected
if (p.isExpectedStartObjectToken()) {
if (!p.nextFieldName(_orderedPropertyNames[0])) {
return super.deserialize(p, ctxt, bean);
}
} else if (!p.hasToken(JsonToken.FIELD_NAME)
|| !prop.getName().equals(p.getCurrentName())) {
return super.deserialize(p, ctxt, bean);
}
// and deserialize
p.nextToken();
try {
prop.deserializeAndSet(p, ctxt, bean);
} catch (Exception e) {
wrapAndThrow(e, bean, prop.getName(), ctxt);
}
// then rest of properties
for (int i = 1, len = _orderedProperties.length; i < len; ++i) {
prop = _orderedProperties[i];
if (!p.nextFieldName(_orderedPropertyNames[i])) { // miss...
if (p.hasToken(JsonToken.END_OBJECT)) {
return bean;
}
// we likely point to FIELD_NAME, so can just call parent impl
return super.deserialize(p, ctxt, bean);
}
p.nextToken(); // skip field, returns value token
try {
prop.deserializeAndSet(p, ctxt, bean);
} catch (Exception e) {
wrapAndThrow(e, bean, prop.getName(), ctxt);
}
}
// also, need to ensure we get closing END_OBJECT...
if (p.nextToken() != JsonToken.END_OBJECT) {
return super.deserialize(p, ctxt, bean);
}
return bean;
}
}
