com.groupbyinc.common.jackson.databind.deser.BeanDeserializerBuilder Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser;
import java.util.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.fasterxml.jackson.databind.deser.impl.BeanPropertyMap;
import com.fasterxml.jackson.databind.deser.impl.ObjectIdValueProperty;
import com.fasterxml.jackson.databind.deser.impl.ObjectIdReader;
import com.fasterxml.jackson.databind.deser.impl.ValueInjector;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.util.Annotations;
/**
* Builder class used for aggregating deserialization information about
* a POJO, in order to build a {@link JsonDeserializer} for deserializing
* instances.
*/
public class BeanDeserializerBuilder
{
/*
/**********************************************************
/* Configuration
/**********************************************************
*/
final protected DeserializationConfig _config;
/**
* @since 2.9
*/
final protected DeserializationContext _context;
/*
/**********************************************************
/* General information about POJO
/**********************************************************
*/
/**
* Introspected information about POJO for deserializer to handle
*/
final protected BeanDescription _beanDesc;
/*
/**********************************************************
/* Accumulated information about properties
/**********************************************************
*/
/**
* Properties to deserialize collected so far.
*/
final protected Map _properties
= new LinkedHashMap();
/**
* Value injectors for deserialization
*/
protected List _injectables;
/**
* Back-reference properties this bean contains (if any)
*/
protected HashMap _backRefProperties;
/**
* Set of names of properties that are recognized but are to be ignored for deserialization
* purposes (meaning no exception is thrown, value is just skipped).
*/
protected HashSet _ignorableProps;
/**
* Object that will handle value instantiation for the bean type.
*/
protected ValueInstantiator _valueInstantiator;
/**
* Handler for Object Id values, if Object Ids are enabled for the
* bean type.
*/
protected ObjectIdReader _objectIdReader;
/**
* Fallback setter used for handling any properties that are not
* mapped to regular setters. If setter is not null, it will be
* called once for each such property.
*/
protected SettableAnyProperty _anySetter;
/**
* Flag that can be set to ignore and skip unknown properties.
* If set, will not throw an exception for unknown properties.
*/
protected boolean _ignoreAllUnknown;
/**
* When creating Builder-based deserializers, this indicates
* method to call on builder to finalize value.
*/
protected AnnotatedMethod _buildMethod;
/**
* In addition, Builder may have additional configuration
*/
protected JsonPOJOBuilder.Value _builderConfig;
/*
/**********************************************************
/* Life-cycle: construction
/**********************************************************
*/
public BeanDeserializerBuilder(BeanDescription beanDesc,
DeserializationContext ctxt)
{
_beanDesc = beanDesc;
_context = ctxt;
_config = ctxt.getConfig();
}
/**
* Copy constructor for sub-classes to use, when constructing
* custom builder instances
*/
protected BeanDeserializerBuilder(BeanDeserializerBuilder src)
{
_beanDesc = src._beanDesc;
_context = src._context;
_config = src._config;
// let's make copy of properties
_properties.putAll(src._properties);
_injectables = _copy(src._injectables);
_backRefProperties = _copy(src._backRefProperties);
// Hmmh. Should we create defensive copies here? For now, not yet
_ignorableProps = src._ignorableProps;
_valueInstantiator = src._valueInstantiator;
_objectIdReader = src._objectIdReader;
_anySetter = src._anySetter;
_ignoreAllUnknown = src._ignoreAllUnknown;
_buildMethod = src._buildMethod;
_builderConfig = src._builderConfig;
}
private static HashMap _copy(HashMap src) {
return (src == null) ? null
: new HashMap(src);
}
private static List _copy(List src) {
return (src == null) ? null : new ArrayList(src);
}
/*
/**********************************************************
/* Life-cycle: state modification (adders, setters)
/**********************************************************
*/
/**
* Method for adding a new property or replacing a property.
*/
public void addOrReplaceProperty(SettableBeanProperty prop, boolean allowOverride) {
_properties.put(prop.getName(), prop);
}
/**
* Method to add a property setter. Will ensure that there is no
* unexpected override; if one is found will throw a
* {@link IllegalArgumentException}.
*/
public void addProperty(SettableBeanProperty prop)
{
SettableBeanProperty old = _properties.put(prop.getName(), prop);
if (old != null && old != prop) { // should never occur...
throw new IllegalArgumentException("Duplicate property '"+prop.getName()+"' for "+_beanDesc.getType());
}
}
/**
* Method called to add a property that represents so-called back reference;
* reference that "points back" to object that has forward reference to
* currently built bean.
*/
public void addBackReferenceProperty(String referenceName, SettableBeanProperty prop)
{
if (_backRefProperties == null) {
_backRefProperties = new HashMap(4);
}
// 15-Sep-2016, tatu: For some reason fixing access at point of `build()` does
// NOT work (2 failing unit tests). Not 100% clear why, but for now force
// access set early; unfortunate, but since it works....
prop.fixAccess(_config);
_backRefProperties.put(referenceName, prop);
// 16-Jan-2018, tatu: As per [databind#1878] we may want to leave it as is, to allow
// population for cases of "wrong direction", traversing parent first
// If this causes problems should probably instead include in "ignored properties" list
// Alternatively could also extend annotation to allow/disallow explicit value from input
/*
if (_properties != null) {
_properties.remove(prop.getName());
}
*/
}
public void addInjectable(PropertyName propName, JavaType propType,
Annotations contextAnnotations, AnnotatedMember member,
Object valueId)
{
if (_injectables == null) {
_injectables = new ArrayList();
}
boolean fixAccess = _config.canOverrideAccessModifiers();
boolean forceAccess = fixAccess && _config.isEnabled(MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS);
if (fixAccess) {
member.fixAccess(forceAccess);
}
_injectables.add(new ValueInjector(propName, propType, member, valueId));
}
/**
* Method that will add property name as one of properties that can
* be ignored if not recognized.
*/
public void addIgnorable(String propName)
{
if (_ignorableProps == null) {
_ignorableProps = new HashSet();
}
_ignorableProps.add(propName);
}
/**
* Method called by deserializer factory, when a "creator property"
* (something that is passed via constructor- or factory method argument;
* instead of setter or field).
*
* Default implementation does not do anything; we may need to revisit this
* decision if these properties need to be available through accessors.
* For now, however, we just have to ensure that we don't try to resolve
* types that masked setter/field has (see [JACKSON-700] for details).
*/
public void addCreatorProperty(SettableBeanProperty prop)
{
addProperty(prop);
}
public void setAnySetter(SettableAnyProperty s)
{
if (_anySetter != null && s != null) {
throw new IllegalStateException("_anySetter already set to non-null");
}
_anySetter = s;
}
public void setIgnoreUnknownProperties(boolean ignore) {
_ignoreAllUnknown = ignore;
}
public void setValueInstantiator(ValueInstantiator inst) {
_valueInstantiator = inst;
}
public void setObjectIdReader(ObjectIdReader r) {
_objectIdReader = r;
}
public void setPOJOBuilder(AnnotatedMethod buildMethod, JsonPOJOBuilder.Value config) {
_buildMethod = buildMethod;
_builderConfig = config;
}
/*
/**********************************************************
/* Public accessors
/**********************************************************
*/
/**
* Method that allows accessing all properties that this
* builder currently contains.
*
* Note that properties are returned in order that properties
* are ordered (explictly, or by rule), which is the serialization
* order.
*/
public Iterator getProperties() {
return _properties.values().iterator();
}
public SettableBeanProperty findProperty(PropertyName propertyName) {
return _properties.get(propertyName.getSimpleName());
}
public boolean hasProperty(PropertyName propertyName) {
return findProperty(propertyName) != null;
}
public SettableBeanProperty removeProperty(PropertyName name) {
return _properties.remove(name.getSimpleName());
}
public SettableAnyProperty getAnySetter() {
return _anySetter;
}
public ValueInstantiator getValueInstantiator() {
return _valueInstantiator;
}
public List getInjectables() {
return _injectables;
}
public ObjectIdReader getObjectIdReader() {
return _objectIdReader;
}
public AnnotatedMethod getBuildMethod() {
return _buildMethod;
}
public JsonPOJOBuilder.Value getBuilderConfig() {
return _builderConfig;
}
/**
* @since 2.9.4
*/
public boolean hasIgnorable(String name) {
return (_ignorableProps != null) && _ignorableProps.contains(name);
}
/*
/**********************************************************
/* Build method(s)
/**********************************************************
*/
/**
* Method for constructing a {@link BeanDeserializer}, given all
* information collected.
*/
public JsonDeserializer build()
{
Collection props = _properties.values();
_fixAccess(props);
BeanPropertyMap propertyMap = BeanPropertyMap.construct(props,
_config.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES),
_collectAliases(props));
propertyMap.assignIndexes();
// view processing must be enabled if:
// (a) fields are not included by default (when deserializing with view), OR
// (b) one of properties has view(s) to included in defined
boolean anyViews = !_config.isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION);
if (!anyViews) {
for (SettableBeanProperty prop : props) {
if (prop.hasViews()) {
anyViews = true;
break;
}
}
}
// one more thing: may need to create virtual ObjectId property:
if (_objectIdReader != null) {
/* 18-Nov-2012, tatu: May or may not have annotations for id property;
* but no easy access. But hard to see id property being optional,
* so let's consider required at this point.
*/
ObjectIdValueProperty prop = new ObjectIdValueProperty(_objectIdReader, PropertyMetadata.STD_REQUIRED);
propertyMap = propertyMap.withProperty(prop);
}
return new BeanDeserializer(this,
_beanDesc, propertyMap, _backRefProperties, _ignorableProps, _ignoreAllUnknown,
anyViews);
}
/**
* Alternate build method used when we must be using some form of
* abstract resolution, usually by using addition Type Id
* ("polymorphic deserialization")
*
* @since 2.0
*/
public AbstractDeserializer buildAbstract() {
return new AbstractDeserializer(this, _beanDesc, _backRefProperties, _properties);
}
/**
* Method for constructing a specialized deserializer that uses
* additional external Builder object during data binding.
*/
public JsonDeserializer buildBuilderBased(JavaType valueType, String expBuildMethodName)
throws JsonMappingException
{
// First: validation; must have build method that returns compatible type
if (_buildMethod == null) {
// as per [databind#777], allow empty name
if (!expBuildMethodName.isEmpty()) {
_context.reportBadDefinition(_beanDesc.getType(),
String.format("Builder class %s does not have build method (name: '%s')",
_beanDesc.getBeanClass().getName(),
expBuildMethodName));
}
} else {
// also: type of the method must be compatible
Class rawBuildType = _buildMethod.getRawReturnType();
Class rawValueType = valueType.getRawClass();
if ((rawBuildType != rawValueType)
&& !rawBuildType.isAssignableFrom(rawValueType)
&& !rawValueType.isAssignableFrom(rawBuildType)) {
_context.reportBadDefinition(_beanDesc.getType(),
String.format("Build method '%s' has wrong return type (%s), not compatible with POJO type (%s)",
_buildMethod.getFullName(),
rawBuildType.getName(),
valueType.getRawClass().getName()));
}
}
// And if so, we can try building the deserializer
Collection props = _properties.values();
_fixAccess(props);
BeanPropertyMap propertyMap = BeanPropertyMap.construct(props,
_config.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES),
_collectAliases(props));
propertyMap.assignIndexes();
boolean anyViews = !_config.isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION);
if (!anyViews) {
for (SettableBeanProperty prop : props) {
if (prop.hasViews()) {
anyViews = true;
break;
}
}
}
if (_objectIdReader != null) {
// May or may not have annotations for id property; but no easy access.
// But hard to see id property being optional, so let's consider required at this point.
ObjectIdValueProperty prop = new ObjectIdValueProperty(_objectIdReader,
PropertyMetadata.STD_REQUIRED);
propertyMap = propertyMap.withProperty(prop);
}
return new BuilderBasedDeserializer(this,
_beanDesc, valueType, propertyMap, _backRefProperties, _ignorableProps, _ignoreAllUnknown,
anyViews);
}
/*
/**********************************************************
/* Internal helper method(s)
/**********************************************************
*/
protected void _fixAccess(Collection mainProps)
{
/* 07-Sep-2016, tatu: Ideally we should be able to avoid forcing
* access to properties that are likely ignored, but due to
* renaming it seems this is not a safe thing to do (there was
* at least one failing test). May need to dig deeper in future;
* for now let's just play it safe.
*/
/*
Set ignorable = _ignorableProps;
if (ignorable == null) {
ignorable = Collections.emptySet();
}
*/
for (SettableBeanProperty prop : mainProps) {
/*
// first: no point forcing access on to-be-ignored properties
if (ignorable.contains(prop.getName())) {
continue;
}
*/
prop.fixAccess(_config);
}
// 15-Sep-2016, tatu: Access via back-ref properties has been done earlier
// as it has to, for some reason, so not repeated here.
/*
if (_backRefProperties != null) {
for (SettableBeanProperty prop : _backRefProperties.values()) {
prop.fixAccess(_config);
}
}
*/
if (_anySetter != null) {
_anySetter.fixAccess(_config);
}
if (_buildMethod != null) {
_buildMethod.fixAccess(_config.isEnabled(MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS));
}
}
protected Map> _collectAliases(Collection props)
{
Map> mapping = null;
AnnotationIntrospector intr = _config.getAnnotationIntrospector();
if (intr != null) {
for (SettableBeanProperty prop : props) {
List aliases = intr.findPropertyAliases(prop.getMember());
if ((aliases == null) || aliases.isEmpty()) {
continue;
}
if (mapping == null) {
mapping = new HashMap<>();
}
mapping.put(prop.getName(), aliases);
}
}
if (mapping == null) {
return Collections.emptyMap();
}
return mapping;
}
}