com.fasterxml.jackson.module.afterburner.deser.DeserializerModifier Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jackson-module-afterburner Show documentation
Show all versions of jackson-module-afterburner Show documentation
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.lang.reflect.Member;
import java.lang.reflect.Modifier;
import java.util.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.deser.impl.FieldProperty;
import com.fasterxml.jackson.databind.deser.impl.MethodProperty;
import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.module.afterburner.util.MyClassLoader;
public class DeserializerModifier extends BeanDeserializerModifier
implements java.io.Serializable // since 2.11.1
{
private static final long serialVersionUID = 1L; // since 2.11.1
/**
* Class loader to use for generated classes; if null, will try to
* use class loader of the target class.
*/
protected final MyClassLoader _classLoader;
protected final boolean _useCustomDeserializer;
public DeserializerModifier(ClassLoader cl, boolean useCustomDeserializer)
{
// If we were given parent class loader explicitly, use that:
_classLoader = (cl == null) ? null : new MyClassLoader(cl, false);
_useCustomDeserializer = useCustomDeserializer;
}
/*
/**********************************************************************
/* BeanDeserializerModifier methods
/**********************************************************************
*/
@Override
public BeanDeserializerBuilder updateBuilder(DeserializationConfig config,
BeanDescription beanDesc, BeanDeserializerBuilder builder)
{
final Class beanClass = beanDesc.getBeanClass();
// [module-afterburner#21]: Can't force access to sealed packages, or anything within "java."
if (!MyClassLoader.canAddClassInPackageOf(beanClass)) {
return builder;
}
/* Hmmh. Can we access stuff from private classes?
* Possibly, if we can use parent class loader.
* (should probably skip all non-public?)
*/
if (_classLoader != null) {
if (Modifier.isPrivate(beanClass.getModifiers())) {
return builder;
}
}
PropertyMutatorCollector collector = new PropertyMutatorCollector(beanClass);
List> newProps = findOptimizableProperties(
config, collector, builder.getProperties());
// and if we found any, create mutator proxy, replace property objects
if (!newProps.isEmpty()) {
BeanPropertyMutator baseMutator = collector.buildMutator(_classLoader);
for (OptimizedSettableBeanProperty prop : newProps) {
builder.addOrReplaceProperty(prop.withMutator(baseMutator), true);
}
}
// Second thing: see if we could (re)generate Creator(s):
ValueInstantiator inst = builder.getValueInstantiator();
/* Hmmh. Probably better to require exact default implementation
* and not sub-class; chances are sub-class uses its own
* construction anyway.
*/
if (inst.getClass() == StdValueInstantiator.class) {
// also, only override if using default creator (no-arg ctor, no-arg static factory)
if (inst.canCreateUsingDefault()) {
inst = new CreatorOptimizer(beanClass, _classLoader, (StdValueInstantiator) inst).createOptimized();
if (inst != null) {
builder.setValueInstantiator(inst);
}
}
}
// also: may want to replace actual BeanDeserializer as well? For this, need to replace builder
// (but only if builder is the original standard one; don't want to break other impls)
if (_useCustomDeserializer && builder.getClass() == BeanDeserializerBuilder.class) {
return new SuperSonicDeserializerBuilder(builder);
}
return builder;
}
/*
/**********************************************************************
/* Internal methods
/**********************************************************************
*/
protected List> findOptimizableProperties(
DeserializationConfig config, PropertyMutatorCollector collector,
Iterator propIterator)
{
ArrayList> newProps = new ArrayList>();
// Ok, then, find any properties for which we could generate accessors
while (propIterator.hasNext()) {
SettableBeanProperty prop = propIterator.next();
AnnotatedMember member = prop.getMember();
Member jdkMember = member.getMember();
// if we ever support virtual properties, this would be null, so check, skip
if (jdkMember == null) {
continue;
}
// First: we can't access private fields or methods....
if (Modifier.isPrivate(jdkMember.getModifiers())) {
continue;
}
// (although, interestingly enough, can seem to access private classes...)
// 30-Jul-2012, tatu: [module-afterburner#6]: Needs to skip custom deserializers, if any.
if (prop.hasValueDeserializer()) {
if (!isDefaultDeserializer(prop.getValueDeserializer())) {
continue;
}
}
if (prop instanceof MethodProperty) { // simple setter methods
Class type = ((AnnotatedMethod) member).getRawParameterType(0);
if (type.isPrimitive()) {
if (type == Integer.TYPE) {
newProps.add(collector.addIntSetter(prop));
} else if (type == Long.TYPE) {
newProps.add(collector.addLongSetter(prop));
} else if (type == Boolean.TYPE) {
newProps.add(collector.addBooleanSetter(prop));
}
} else {
if (type == String.class) {
newProps.add(collector.addStringSetter(prop));
} else { // any other Object types; we can at least call accessor
newProps.add(collector.addObjectSetter(prop));
}
}
} else if (prop instanceof FieldProperty) { // regular fields
// And as to fields, can not overwrite final fields (which may
// be overwritable via Reflection)
if (Modifier.isFinal(prop.getMember().getMember().getModifiers())) {
continue;
}
Class type = member.getRawType();
if (type.isPrimitive()) {
if (type == Integer.TYPE) {
newProps.add(collector.addIntField(prop));
} else if (type == Long.TYPE) {
newProps.add(collector.addLongField(prop));
} else if (type == Boolean.TYPE) {
newProps.add(collector.addBooleanField(prop));
}
} else {
if (type == String.class) {
newProps.add(collector.addStringField(prop));
} else { // any other Object types; we can at least call accessor
newProps.add(collector.addObjectField(prop));
}
}
}
}
return newProps;
}
/**
* Helper method used to check whether given deserializer is the default
* deserializer implementation: this is necessary to avoid overriding other
* kinds of deserializers.
*/
protected boolean isDefaultDeserializer(JsonDeserializer deser) {
return ClassUtil.isJacksonStdImpl(deser)
// 07-May-2018, tatu: Probably can't happen but just in case
|| (deser instanceof SuperSonicBeanDeserializer);
}
}