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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.util.ClassUtil;
import org.codehaus.jackson.map.util.LinkedNode;
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.
* Additionally it is important to be able to cache bean serializers
* to handle cyclic references.
*/
public class BeanDeserializer
extends JsonDeserializer
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.
*/
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 StringConstructor _stringConstructor;
/**
* 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 NumberConstructor _numberConstructor;
/*
///////////////////////////////////////////////
// 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)
{
_beanType = type;
_props = new HashMap();
_ignorableProps = null;
}
public void setDefaultConstructor(Constructor ctor) {
_defaultConstructor = ctor;
}
public void setConstructor(StringConstructor ctor) {
_stringConstructor = ctor;
}
public void setConstructor(NumberConstructor ctor) {
_numberConstructor = ctor;
}
/**
* 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 validateConstructors()
{
// sanity check: must have a constructor of one type or another
if ((_defaultConstructor == null) && (_numberConstructor == null)
&& (_stringConstructor == null)) {
throw new IllegalArgumentException("Can not create Bean deserializer for ("+_beanType+"): neither default 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 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 = provider.findValueDeserializer(config, type, _beanType, prop.getPropertyName());
if (deser instanceof BeanDeserializer) {
if (seen == null) {
seen = new HashMap>();
}
seen.put(type, deser);
}
}
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 = provider.findValueDeserializer(config, type, _beanType, null);
}
_anySetter.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) {
Object value = _stringConstructor.construct(jp.getText());
if (value != null) {
return value;
}
}
if (t.isNumeric()) {
Object value = null;
switch (jp.getNumberType()) {
case INT:
value = _numberConstructor.construct(jp.getIntValue());
break;
case LONG:
value = _numberConstructor.construct(jp.getLongValue());
break;
}
if (value != null) {
return value;
}
}
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
{
// !!! TODO: alternative constructors (with annotated params)
// But for now, must have the default constructor:
if (_defaultConstructor == null) {
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;
}
/*
/////////////////////////////////////////////////////////
// Overridable helper methods
/////////////////////////////////////////////////////////
*/
/**
* Method called to deal with a property that did not map to a known
* Bean property. Method can deal with the problem as it sees fit (ignore,
* throw exception); but if it does return, it has to skip the matching
* Json content parser has.
*
* @param ctxt Context for deserialization; allows access to the parser,
* error reporting functionality
* @param resultBean Bean that is being populated by this deserializer
* @param propName Name of the property that can not be mapped
*/
protected void handleUnknownProperty(DeserializationContext ctxt, Object resultBean, String propName)
throws IOException, JsonProcessingException
{
// otherwise, what to do with it? Ignore?
if (_ignorableProps != null && _ignorableProps.contains(propName)) {
; // fine, ignore as is
} else {
LinkedNode h = ctxt.getConfig().getProblemHandlers();
while (h != null) {
// Can bail out if it's handled
if (h.value().handleUnknownProperty(ctxt, this, resultBean, propName)) {
return;
}
}
// Nope, not handled. Still a problem:
reportUnknownField(ctxt, resultBean, propName);
}
/* either way, need to skip now; we point to first token of value
* (START_xxx for structured, or the value token for others)
*/
ctxt.getParser().skipChildren();
}
protected void reportUnknownField(DeserializationContext ctxt,
Object resultBean, String fieldName)
throws IOException, JsonProcessingException
{
throw ctxt.unknownFieldException(resultBean, fieldName);
}
/*
/////////////////////////////////////////////////////////
// Helper classes
/////////////////////////////////////////////////////////
*/
static class ConstructorBase
{
protected final Class _valueClass;
public ConstructorBase(Class valueClass)
{
_valueClass = valueClass;
}
}
/**
* Helper class that can handle simple deserialization from
* Json String values.
*/
final static class StringConstructor
extends ConstructorBase
{
protected final Method _factoryMethod;
protected final Constructor _ctor;
public StringConstructor(Class valueClass, Constructor ctor,
Method factoryMethod)
{
super(valueClass);
_ctor = ctor;
_factoryMethod = factoryMethod;
}
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 NumberConstructor
extends ConstructorBase
{
protected final Constructor _intCtor;
protected final Constructor _longCtor;
protected final Method _intFactoryMethod;
protected final Method _longFactoryMethod;
public NumberConstructor(Class valueClass,
Constructor intCtor,
Constructor longCtor,
Method ifm, Method lfm)
{
super(valueClass);
_intCtor = intCtor;
_longCtor = longCtor;
_intFactoryMethod = ifm;
_longFactoryMethod = lfm;
}
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;
}
}
}
