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org.codehaus.jackson.map.deser.BeanDeserializer Maven / Gradle / Ivy
Data Mapper package is a high-performance data binding package
built on Jackson JSON processor
package org.codehaus.jackson.map.deser;
import java.io.IOException;
import java.lang.reflect.*;
import java.util.*;
import org.codehaus.jackson.*;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.map.annotate.JsonCachable;
import org.codehaus.jackson.map.introspect.AnnotatedConstructor;
import org.codehaus.jackson.map.introspect.AnnotatedMethod;
import org.codehaus.jackson.map.type.TypeFactory;
import org.codehaus.jackson.map.util.ClassUtil;
import org.codehaus.jackson.type.JavaType;
/**
* Deserializer class that can deserialize instances of
* arbitrary bean objects, usually from Json Object structs,
* but possibly also from simple types like String values.
*/
@JsonCachable
/* Because of costs associated with constructing bean deserializers,
* they usually should be cached unlike other deserializer types.
* But more importantly, it is important to be able to cache
* bean serializers to handle cyclic references.
*/
public class BeanDeserializer
extends StdDeserializer
implements ResolvableDeserializer
{
/*
///////////////////////////////////////////////
// Information regarding type being deserialized
///////////////////////////////////////////////
*/
final protected JavaType _beanType;
/*
///////////////////////////////////////////////
// Construction configuration
///////////////////////////////////////////////
*/
/**
* Default constructor used to instantiate the bean when mapping
* from Json object, and only using setters for initialization
* (not specific constructors)
*/
protected Constructor _defaultConstructor;
/**
* If the "bean" class can be instantiated using just a single
* String (via constructor, static method etc), this object
* knows how to invoke method/constructor in question.
* If so, no setters will be used.
*/
protected StringCreator _stringCreator;
/**
* If the "bean" class can be instantiated using just a single
* numeric (int, long) value (via constructor, static method etc),
* this object
* knows how to invoke method/constructor in question.
* If so, no setters will be used.
*/
protected NumberCreator _numberCreator;
/**
* If the bean class can be instantiated using a creator
* (an annotated single arg constructor or static method),
* this object is used for handling details of how delegate-based
* deserialization and instance construction works
*/
protected DelegatingCreator _delegatingCreator;
/**
* If the beans need to be instantiated using constructor
* or factory method
* that takes one or more named properties as argument(s),
* this creator is used for serialization.
*/
protected PropertyBasedCreator _propertyBasedCreator;
/*
///////////////////////////////////////////////
// Property information, setters
///////////////////////////////////////////////
*/
/**
* Things set via setters (modifiers) are included in this
* Map.
*/
final protected HashMap _props;
/**
* 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;
/**
* In addition to properties that are set, we will also keep
* track of recognized but ignorable properties: these will
* be skipped without errors or warnings.
*/
protected HashSet _ignorableProps;
/*
/////////////////////////////////////////////////////////
// Life-cycle, construction, initialization
/////////////////////////////////////////////////////////
*/
public BeanDeserializer(JavaType type)
{
super(type.getRawClass());
_beanType = type;
_props = new HashMap();
_ignorableProps = null;
}
public void setDefaultConstructor(Constructor ctor) {
_defaultConstructor = ctor;
}
/**
* Method called by factory after it has introspected all available
* Creators (constructors, static factory methods).
*/
public void setCreators(CreatorContainer creators)
{
_stringCreator = creators.stringCreator();
_numberCreator = creators.numberCreator();
/**
* Delegating constructor means that
* the JSON Object is first deserialized into delegated type, and
* then resulting value is passed as the argument to delegating
* constructor.
*
* Note that delegating constructors have precedence over default
* and property-based constructors.
*/
_delegatingCreator = creators.delegatingCreator();
_propertyBasedCreator = creators.propertyBasedCreator();
/* important: ensure we do not hold on to default constructor,
* if delegating OR property-based creator is found
*/
if (_delegatingCreator != null || _propertyBasedCreator != null) {
_defaultConstructor = null;
}
}
/**
* 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 = _props.put(prop.getPropertyName(), prop);
if (old != null && old != prop) { // should never occur...
throw new IllegalArgumentException("Duplicate property '"+prop.getPropertyName()+"' for "+_beanType);
}
}
public SettableBeanProperty removeProperty(String name)
{
return _props.remove(name);
}
public void setAnySetter(SettableAnyProperty s)
{
if (_anySetter != null && s != null) {
throw new IllegalStateException("_anySetter already set to non-null");
}
_anySetter = s;
}
/**
* 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);
}
/*
/////////////////////////////////////////////////////////
// Validation, post-processing
/////////////////////////////////////////////////////////
*/
/**
* Method called to ensure that there is at least one constructor
* that could be used to construct an instance.
*/
public void validateCreators()
throws JsonMappingException
{
// sanity check: must have a constructor of one type or another
if ((_defaultConstructor == null)
&& (_numberCreator == null)
&& (_stringCreator == null)
&& (_delegatingCreator == null)
&& (_propertyBasedCreator == null)) {
throw new JsonMappingException("Can not create Bean deserializer for ("+_beanType+"): neither default/delegating constructor nor factory methods found");
}
}
/**
* Method called to finalize setup of this deserializer,
* after deserializer itself has been registered. This
* is needed to handle recursive and transitive dependencies.
*/
public void resolve(DeserializationConfig config, DeserializerProvider provider)
throws JsonMappingException
{
// let's reuse same instances, not all are cached by provider
/* 04-Feb-2009, tatu: This is tricky now that we are to pass referrer
* information, as there is no easy+reliable+efficient way to do
* it. But we can use a quick heuristic: only cache "expensive"
* BeanDeserializers; for them it is unlikely that different
* references should lead to different deserializers, and for other
* types cost is much lower so we can drop caching
*/
HashMap> seen = null;
for (SettableBeanProperty prop : _props.values()) {
// May already have deserializer from annotations, if so, skip:
if (prop.hasValueDeserializer()) {
continue;
}
JavaType type = prop.getType();
JsonDeserializer deser = null;
if (seen != null) {
deser = seen.get(type);
}
if (deser == null) {
deser = findDeserializer(config, provider, type, prop.getPropertyName(), seen);
}
prop.setValueDeserializer(deser);
}
// Finally, "any setter" may also need to be resolved now
if (_anySetter != null && !_anySetter.hasValueDeserializer()) {
JavaType type = _anySetter.getType();
JsonDeserializer deser = null;
if (seen != null) {
deser = seen.get(type);
}
if (deser == null) {
deser = findDeserializer(config, provider, type, "[any]", seen);
}
_anySetter.setValueDeserializer(deser);
}
// as well as delegate-based constructor:
if (_delegatingCreator != null) {
JsonDeserializer deser = findDeserializer(config, provider, _delegatingCreator.getValueType(), "[constructor-arg[0]]", seen);
_delegatingCreator.setDeserializer(deser);
}
// or property-based one
if (_propertyBasedCreator != null) {
for (SettableBeanProperty prop : _propertyBasedCreator.properties()) {
JavaType type = prop.getType();
JsonDeserializer deser = null;
if (seen != null) {
deser = seen.get(type);
}
if (deser == null) {
deser = findDeserializer(config, provider, type, prop.getPropertyName(), seen);
}
prop.setValueDeserializer(deser);
}
}
}
/*
/////////////////////////////////////////////////////////
// JsonDeserializer implementation
/////////////////////////////////////////////////////////
*/
public final Object deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.START_OBJECT) {
return deserializeFromObject(jp, ctxt);
}
if (t == JsonToken.VALUE_STRING) {
return deserializeFromString(jp, ctxt);
}
if (t.isNumeric()) {
return deserializeFromNumber(jp, ctxt);
}
throw ctxt.mappingException(getBeanClass());
}
/*
/////////////////////////////////////////////////////////
// Other public accessors
/////////////////////////////////////////////////////////
*/
public final Class getBeanClass() { return _beanType.getRawClass(); }
/*
/////////////////////////////////////////////////////////
// Concrete deserialization methods
/////////////////////////////////////////////////////////
*/
public Object deserializeFromObject(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_defaultConstructor == null) {
// 25-Jul-2009, tatu: finally, can also use "non-default" constructor (or factory method)
if (_propertyBasedCreator != null) {
return _deserializeUsingPropertyBased(jp, ctxt);
}
// 07-Jul-2009, tatu: let's allow delegate-based approach too
if (_delegatingCreator != null) {
return _delegatingCreator.deserialize(jp, ctxt);
}
throw JsonMappingException.from(jp, "No default constructor found for type "+_beanType+": can not instantiate from Json object");
}
Object bean;
try {
bean = _defaultConstructor.newInstance();
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
return null; // never gets here
}
while (jp.nextToken() != JsonToken.END_OBJECT) { // otherwise field name
String propName = jp.getCurrentName();
SettableBeanProperty prop = _props.get(propName);
if (prop != null) { // normal case
prop.deserializeAndSet(jp, ctxt, bean);
continue;
}
if (_anySetter != null) {
_anySetter.deserializeAndSet(jp, ctxt, bean, propName);
continue;
}
// need to process or skip the following token
/*JsonToken t =*/ jp.nextToken();
// Unknown: let's call handler method
handleUnknownProperty(ctxt, bean, propName);
}
return bean;
}
public Object deserializeFromString(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_stringCreator != null) {
return _stringCreator.construct(jp.getText());
}
if (_delegatingCreator != null) {
return _delegatingCreator.deserialize(jp, ctxt);
}
throw ctxt.mappingException(getBeanClass());
}
public Object deserializeFromNumber(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_numberCreator != null) {
switch (jp.getNumberType()) {
case INT:
return _numberCreator.construct(jp.getIntValue());
case LONG:
return _numberCreator.construct(jp.getLongValue());
}
}
if (_delegatingCreator != null) {
return _delegatingCreator.deserialize(jp, ctxt);
}
throw ctxt.mappingException(getBeanClass());
}
/**
* Method called to deserialize bean using "property-based creator":
* this means that a non-default constructor or factory method is
* called, and then possibly other setters. The trick is that
* values for creator method need to be buffered, first; and
* due to non-guaranteed ordering possibly some other properties
* as well.
*
* @since 1.2
*/
protected final Object _deserializeUsingPropertyBased(final JsonParser jp, final DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
final PropertyBasedCreator creator = _propertyBasedCreator;
PropertyBuffer buffer = creator.startBuilding(jp, ctxt);
while (true) {
// end of JSON object?
if (jp.nextToken() == JsonToken.END_OBJECT) {
// if so, can just construct and leave...
return creator.build(buffer);
}
String propName = jp.getCurrentName();
// creator property?
SettableBeanProperty prop = creator.findCreatorProperty(propName);
if (prop != null) {
// Last property to set?
if (buffer.assignParameter(prop.getCreatorIndex(), prop.deserialize(jp, ctxt))) {
return _deserializeProperties(jp, ctxt, creator.build(buffer));
}
continue;
}
// regular property? needs buffering
prop = _props.get(propName);
if (prop != null) {
buffer.bufferProperty(prop, prop.deserialize(jp, ctxt));
continue;
}
// "any property"?
if (_anySetter != null) {
buffer.bufferAnyProperty(_anySetter, propName, _anySetter.deserialize(jp, ctxt));
continue;
}
// Unknown? This is trickiest to deal with...
/* !!! 25-Jul-2009, tatu: This should be improved, once we
* have a better way dealing with unknown properties
*/
// need to process or skip the following token
/*JsonToken t =*/ jp.nextToken();
// Unknown: let's call handler method
handleUnknownProperty(ctxt, getBeanClass(), propName);
}
}
/**
* Method that will process "extra" properties that follow
* Creator-bound properties (if any).
*/
protected Object _deserializeProperties(final JsonParser jp, final DeserializationContext ctxt,
Object bean)
throws IOException, JsonProcessingException
{
while (jp.nextToken() != JsonToken.END_OBJECT) { // otherwise field name
String propName = jp.getCurrentName();
SettableBeanProperty prop = _props.get(propName);
if (prop != null) { // normal case
prop.deserializeAndSet(jp, ctxt, bean);
continue;
}
if (_anySetter != null) {
_anySetter.deserializeAndSet(jp, ctxt, bean, propName);
continue;
}
// need to process or skip the following token
/*JsonToken t =*/ jp.nextToken();
// Unknown: let's call handler method
handleUnknownProperty(ctxt, bean, propName);
}
return bean;
}
/*
/////////////////////////////////////////////////////////
// Overridable helper methods
/////////////////////////////////////////////////////////
*/
@Override
protected void handleUnknownProperty(DeserializationContext ctxt, Object beanOrClass, String propName)
throws IOException, JsonProcessingException
{
// If registered as ignorable, skip
if (_ignorableProps != null && _ignorableProps.contains(propName)) {
ctxt.getParser().skipChildren();
return;
}
/* Otherwise use default handling (call handler(s); if not
* handled, throw exception or skip depending on settings)
*/
super.handleUnknownProperty(ctxt, beanOrClass, propName);
}
/**
* Helper method used to locate deserializers for properties the
* bean itself contains.
*/
protected JsonDeserializer findDeserializer(DeserializationConfig config, DeserializerProvider provider,
JavaType type, String propertyName,
HashMap> seen)
throws JsonMappingException
{
JsonDeserializer deser = provider.findValueDeserializer(config, type, _beanType, propertyName);
if (deser instanceof BeanDeserializer) {
if (seen == null) {
seen = new HashMap>();
}
seen.put(type, deser);
}
return deser;
}
/*
/////////////////////////////////////////////////////////
// Helper classes: containers
/////////////////////////////////////////////////////////
*/
/**
* Container for set of Creators (constructors, factory methods)
*/
public final static class CreatorContainer
{
/// Type of bean being created
final Class _beanClass;
final boolean _canFixAccess;
AnnotatedMethod _strFactory, _intFactory, _longFactory;
AnnotatedMethod _delegatingFactory;
AnnotatedMethod _propertyBasedFactory;
SettableBeanProperty[] _propertyBasedFactoryProperties = null;
AnnotatedConstructor _strConstructor, _intConstructor, _longConstructor;
AnnotatedConstructor _delegatingConstructor;
AnnotatedConstructor _propertyBasedConstructor;
SettableBeanProperty[] _propertyBasedConstructorProperties = null;
public CreatorContainer(Class beanClass, boolean canFixAccess) {
_canFixAccess = canFixAccess;
_beanClass = beanClass;
}
/*
/////////////////////////////////////////////////////////
// Setters
/////////////////////////////////////////////////////////
*/
public void addStringConstructor(AnnotatedConstructor ctor) {
_strConstructor = verifyNonDup(ctor, _strConstructor, "String");
}
public void addIntConstructor(AnnotatedConstructor ctor) {
_intConstructor = verifyNonDup(ctor, _intConstructor, "int");
}
public void addLongConstructor(AnnotatedConstructor ctor) {
_longConstructor = verifyNonDup(ctor, _longConstructor, "long");
}
public void addDelegatingConstructor(AnnotatedConstructor ctor) {
_delegatingConstructor = verifyNonDup(ctor, _delegatingConstructor, "long");
}
public void addPropertyConstructor(AnnotatedConstructor ctor, SettableBeanProperty[] properties)
{
_propertyBasedConstructor = verifyNonDup(ctor, _propertyBasedConstructor, "property-based");
_propertyBasedConstructorProperties = properties;
}
public void addStringFactory(AnnotatedMethod factory) {
_strFactory = verifyNonDup(factory, _strFactory, "String");
}
public void addIntFactory(AnnotatedMethod factory) {
_intFactory = verifyNonDup(factory, _intFactory, "int");
}
public void addLongFactory(AnnotatedMethod factory) {
_longFactory = verifyNonDup(factory, _longFactory, "long");
}
public void addDelegatingFactory(AnnotatedMethod factory) {
_delegatingFactory = verifyNonDup(factory, _delegatingFactory, "long");
}
public void addPropertyFactory(AnnotatedMethod factory, SettableBeanProperty[] properties)
{
_propertyBasedFactory = verifyNonDup(factory, _propertyBasedFactory, "property-based");
_propertyBasedFactoryProperties = properties;
}
/*
/////////////////////////////////////////////////////////
// Accessors
/////////////////////////////////////////////////////////
*/
public StringCreator stringCreator()
{
if (_strConstructor == null && _strFactory == null) {
return null;
}
return new StringCreator(_beanClass, _strConstructor, _strFactory);
}
public NumberCreator numberCreator()
{
if (_intConstructor == null && _intFactory == null
|| _longConstructor == null && _longFactory == null) {
return null;
}
return new NumberCreator(_beanClass, _intConstructor, _intFactory,
_longConstructor, _longFactory);
}
public DelegatingCreator delegatingCreator()
{
if (_delegatingConstructor == null && _delegatingFactory == null) {
return null;
}
return new DelegatingCreator(_delegatingConstructor, _delegatingFactory);
}
public PropertyBasedCreator propertyBasedCreator()
{
if (_propertyBasedConstructor == null && _propertyBasedFactory == null) {
return null;
}
return new PropertyBasedCreator(_propertyBasedConstructor, _propertyBasedConstructorProperties,
_propertyBasedFactory, _propertyBasedFactoryProperties);
}
/*
/////////////////////////////////////////////////////////
// Helper methods
/////////////////////////////////////////////////////////
*/
protected AnnotatedConstructor verifyNonDup(AnnotatedConstructor newOne, AnnotatedConstructor oldOne,
String type)
{
if (oldOne != null) {
throw new IllegalArgumentException("Conflicting "+type+" constructors: already had "+oldOne+", encountered "+newOne);
}
if (_canFixAccess) {
ClassUtil.checkAndFixAccess(newOne.getAnnotated());
}
return newOne;
}
protected AnnotatedMethod verifyNonDup(AnnotatedMethod newOne, AnnotatedMethod oldOne,
String type)
{
if (oldOne != null) {
throw new IllegalArgumentException("Conflicting "+type+" factory methods: already had "+oldOne+", encountered "+newOne);
}
if (_canFixAccess) {
ClassUtil.checkAndFixAccess(newOne.getAnnotated());
}
return newOne;
}
}
/*
/////////////////////////////////////////////////////////
// Helper classes: concreate Creators
/////////////////////////////////////////////////////////
*/
/**
* Helper class that can handle simple deserialization from
* Json String values.
*/
final static class StringCreator
{
protected final Class _valueClass;
protected final Method _factoryMethod;
protected final Constructor _ctor;
public StringCreator(Class valueClass, AnnotatedConstructor ctor,
AnnotatedMethod factoryMethod)
{
_valueClass = valueClass;
_ctor = (ctor == null) ? null : ctor.getAnnotated();
_factoryMethod = (factoryMethod == null) ? null : factoryMethod.getAnnotated();
}
public Object construct(String value)
{
try {
if (_ctor != null) {
return _ctor.newInstance(value);
}
if (_factoryMethod != null) {
return _factoryMethod.invoke(_valueClass, value);
}
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
}
return null;
}
}
final static class NumberCreator
{
protected final Class _valueClass;
protected final Constructor _intCtor;
protected final Constructor _longCtor;
protected final Method _intFactoryMethod;
protected final Method _longFactoryMethod;
public NumberCreator(Class valueClass,
AnnotatedConstructor intCtor, AnnotatedMethod ifm,
AnnotatedConstructor longCtor, AnnotatedMethod lfm)
{
_valueClass = valueClass;
_intCtor = (intCtor == null) ? null : intCtor.getAnnotated();
_longCtor = (longCtor == null) ? null : longCtor.getAnnotated();
_intFactoryMethod = (ifm == null) ? null : ifm.getAnnotated();
_longFactoryMethod = (lfm == null) ? null : lfm.getAnnotated();
}
public Object construct(int value)
{
// First: "native" int methods work best:
try {
if (_intCtor != null) {
return _intCtor.newInstance(value);
}
if (_intFactoryMethod != null) {
return _intFactoryMethod.invoke(_valueClass, Integer.valueOf(value));
}
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
}
// but if not, can do widening conversion
return construct((long) value);
}
public Object construct(long value)
{
/* For longs we don't even try casting down to ints;
* theoretically could try if value fits... but let's
* leave that as a future improvement
*/
try {
if (_longCtor != null) {
return _longCtor.newInstance(value);
}
if (_longFactoryMethod != null) {
return _longFactoryMethod.invoke(_valueClass, Long.valueOf(value));
}
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
}
return null;
}
}
/**
* Helper class used to delegate parts of deserialization into
* another serializer, and then construct instance with deserialized
* results (either via constructor or factory method)
*/
final static class DelegatingCreator
{
/**
* Type to deserialize JSON to, as well as the type to pass to
* creator (constructor, factory method)
*/
protected final JavaType _valueType;
protected final Constructor _ctor;
protected final Method _factoryMethod;
/**
* Delegate deserializer to use for actual deserialization, before
* instantiating value
*/
protected JsonDeserializer _deserializer;
public DelegatingCreator(AnnotatedConstructor ctor,
AnnotatedMethod factory)
{
if (ctor != null) {
_ctor = ctor.getAnnotated();
_factoryMethod = null;
_valueType = TypeFactory.fromType(ctor.getParameterType(0));
} else if (factory != null) {
_ctor = null;
_factoryMethod = factory.getAnnotated();
_valueType = TypeFactory.fromType(factory.getParameterType(0));
} else {
throw new IllegalArgumentException("Internal error: neither delegating constructor nor factory method passed");
}
}
public JavaType getValueType() { return _valueType; }
public void setDeserializer(JsonDeserializer deser)
{
_deserializer = deser;
}
public Object deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
Object value = _deserializer.deserialize(jp, ctxt);
try {
if (_ctor != null) {
return _ctor.newInstance(value);
}
// static method, 'obj' can be null
return _factoryMethod.invoke(null, value);
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
return null;
}
}
}
/**
* Helper class used to handle details of using a "non-default"
* creator (constructor or factory that takes one or more arguments
* that represent logical bean properties)
*/
final static class PropertyBasedCreator
{
protected final Constructor _ctor;
protected final Method _factoryMethod;
/**
* Map that contains property objects for either constructor or factory
* method (whichever one is null: one property for each
* parameter for that one), keyed by logical property name
*/
protected final HashMap _properties;
public PropertyBasedCreator(AnnotatedConstructor ctor, SettableBeanProperty[] ctorProps,
AnnotatedMethod factory, SettableBeanProperty[] factoryProps)
{
// We will only use one: and constructor has precedence over factory
SettableBeanProperty[] props;
if (ctor != null) {
_ctor = ctor.getAnnotated();
_factoryMethod = null;
props = ctorProps;
} else if (factory != null) {
_ctor = null;
_factoryMethod = factory.getAnnotated();
props = factoryProps;
} else {
throw new IllegalArgumentException("Internal error: neither delegating constructor nor factory method passed");
}
_properties = new HashMap();
for (SettableBeanProperty prop : props) {
_properties.put(prop.getPropertyName(), prop);
}
}
public Collection properties() {
return _properties.values();
}
public SettableBeanProperty findCreatorProperty(String name) {
return _properties.get(name);
}
/**
* Method called when starting to build a bean instance.
*/
public PropertyBuffer startBuilding(JsonParser jp, DeserializationContext ctxt)
{
return new PropertyBuffer(jp, ctxt, _properties.size());
}
public Object build(PropertyBuffer buffer)
throws IOException, JsonProcessingException
{
Object bean;
try {
if (_ctor != null) {
bean = _ctor.newInstance(buffer.getParameters());
} else {
bean = _factoryMethod.invoke(null, buffer.getParameters());
}
} catch (Exception e) {
ClassUtil.unwrapAndThrowAsIAE(e);
return null; // never gets here
}
// Anything buffered?
for (PropValue pv = buffer.buffered(); pv != null; pv = pv.next) {
pv.assign(bean);
}
return bean;
}
}
/*
/////////////////////////////////////////////////////////
// Helper classes: builder used with property-based Creator
/////////////////////////////////////////////////////////
*/
/**
* Stateful object used to store state during construction
* of beans that use Creators, and hence need buffering
* before instance is constructed.
*/
final static class PropertyBuffer
{
final JsonParser _parser;
final DeserializationContext _context;
/**
* Buffer for storing creator parameters before constructing
* instance
*/
final Object[] _creatorParameters;
/**
* Number of creator parameters we are still missing.
*
* NOTE: assumes there are no duplicates, for now.
*/
private int _paramsNeeded;
/**
* If we get non-creator parameters before or between
* creator parameters, those need to be buffered. Buffer
* is just a simple linked list
*/
private PropValue _buffered;
public PropertyBuffer(JsonParser jp, DeserializationContext ctxt,
int paramCount)
{
_parser = jp;
_context = ctxt;
_paramsNeeded = paramCount;
_creatorParameters = new Object[paramCount];
}
protected final Object[] getParameters() { return _creatorParameters; }
protected PropValue buffered() { return _buffered; }
/**
* @return True if we have received all creator parameters
*/
public boolean assignParameter(int index, Object value) {
_creatorParameters[index] = value;
return --_paramsNeeded <= 0;
}
public void bufferProperty(SettableBeanProperty prop, Object value) {
_buffered = new RegularPropValue(_buffered, value, prop);
}
public void bufferAnyProperty(SettableAnyProperty prop, String propName, Object value) {
_buffered = new AnyPropValue(_buffered, value, prop, propName);
}
}
/*
/////////////////////////////////////////////////////
// Helper classes for buffering property values
/////////////////////////////////////////////////////
*/
abstract static class PropValue
{
public final PropValue next;
public final Object value;
protected PropValue(PropValue next, Object value)
{
this.next = next;
this.value = value;
}
public abstract void assign(Object bean)
throws IOException, JsonProcessingException;
}
final static class RegularPropValue
extends PropValue
{
final SettableBeanProperty _property;
public RegularPropValue(PropValue next, Object value,
SettableBeanProperty prop)
{
super(next, value);
_property = prop;
}
public void assign(Object bean)
throws IOException, JsonProcessingException
{
_property.set(bean, value);
}
}
final static class AnyPropValue
extends PropValue
{
final SettableAnyProperty _property;
final String _propertyName;
public AnyPropValue(PropValue next, Object value,
SettableAnyProperty prop,
String propName)
{
super(next, value);
_property = prop;
_propertyName = propName;
}
public void assign(Object bean)
throws IOException, JsonProcessingException
{
_property.set(bean, _propertyName, value);
}
}
}
