package com.fasterxml.jackson.databind.ser;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.HashMap;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.SerializableString;
import com.fasterxml.jackson.core.io.SerializedString;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonObjectFormatVisitor;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;
import com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.std.BeanSerializerBase;
import com.fasterxml.jackson.databind.util.Annotations;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.NameTransformer;
/**
* Base bean property handler class, which implements common parts of
* reflection-based functionality for accessing a property value and serializing
* it.
*
* Note that current design tries to keep instances immutable (semi-functional
* style); mostly because these instances are exposed to application code and
* this is to reduce likelihood of data corruption and synchronization issues.
*/
@JacksonStdImpl
// since 2.6. NOTE: sub-classes typically are not
public class BeanPropertyWriter extends PropertyWriter // which extends
// `ConcreteBeanPropertyBase`
implements java.io.Serializable // since 2.6
{
// As of 2.7
private static final long serialVersionUID = 1L;
/**
* Marker object used to indicate "do not serialize if empty"
*/
public final static Object MARKER_FOR_EMPTY = JsonInclude.Include.NON_EMPTY;
/*
/***********************************************************
/* Basic property metadata: name, type, other
/***********************************************************
*/
/**
* Logical name of the property; will be used as the field name under which
* value for the property is written.
*
* NOTE: do NOT change name of this field; it is accessed by Afterburner
* module (until 2.4; not directly from 2.5) ALSO NOTE: ... and while it
* really ought to be `SerializableString`, changing that is also
* binary-incompatible change. So nope.
*/
protected final SerializedString _name;
/**
* Wrapper name to use for this element, if any
*
* @since 2.2
*/
protected final PropertyName _wrapperName;
/**
* Type property is declared to have, either in class definition or
* associated annotations.
*/
protected final JavaType _declaredType;
/**
* Type to use for locating serializer; normally same as return type of the
* accessor method, but may be overridden by annotations.
*/
protected final JavaType _cfgSerializationType;
/**
* Base type of the property, if the declared type is "non-trivial"; meaning
* it is either a structured type (collection, map, array), or
* parameterized. Used to retain type information about contained type,
* which is mostly necessary if type meta-data is to be included.
*/
protected JavaType _nonTrivialBaseType;
/**
* Annotations from context (most often, class that declares property, or in
* case of sub-class serializer, from that sub-class)
*
* NOTE: transient just to support JDK serializability; Annotations do not
* serialize. At all.
*/
protected final transient Annotations _contextAnnotations;
/*
/***********************************************************
/* Settings for accessing property value to serialize
/***********************************************************
*/
/**
* Member (field, method) that represents property and allows access to
* associated annotations.
*/
protected final AnnotatedMember _member;
/**
* Accessor method used to get property value, for method-accessible
* properties. Null if and only if {@link #_field} is null.
*
* `transient` (and non-final) only to support JDK serializability.
*/
protected transient Method _accessorMethod;
/**
* Field that contains the property value for field-accessible properties.
* Null if and only if {@link #_accessorMethod} is null.
*
* `transient` (and non-final) only to support JDK serializability.
*/
protected transient Field _field;
/*
/***********************************************************
/* Serializers needed
/***********************************************************
*/
/**
* Serializer to use for writing out the value: null if it cannot be known
* statically; non-null if it can.
*/
protected JsonSerializer _serializer;
/**
* Serializer used for writing out null values, if any: if null, null values
* are to be suppressed.
*/
protected JsonSerializer _nullSerializer;
/**
* If property being serialized needs type information to be included this
* is the type serializer to use. Declared type (possibly augmented with
* annotations) of property is used for determining exact mechanism to use
* (compared to actual runtime type used for serializing actual state).
*/
protected TypeSerializer _typeSerializer;
/**
* In case serializer is not known statically (i.e. _serializer
* is null), we will use a lookup structure for storing dynamically resolved
* mapping from type(s) to serializer(s).
*/
protected transient PropertySerializerMap _dynamicSerializers;
/*
/***********************************************************
/* Filtering
/***********************************************************
*/
/**
* Whether null values are to be suppressed (nothing written out if value is
* null) or not. Note that this is a configuration value during
* construction, and actual handling relies on setting (or not) of
* {@link #_nullSerializer}.
*/
protected final boolean _suppressNulls;
/**
* Value that is considered default value of the property; used for
* default-value-suppression if enabled.
*/
protected final Object _suppressableValue;
/**
* Alternate set of property writers used when view-based filtering is
* available for the Bean.
*/
protected final Class[] _includeInViews;
/*
/**********************************************************
/* Opaqueinternal data that bean serializer factory and
/* bean serializers can add.
/**********************************************************
*/
protected transient HashMap _internalSettings;
/*
/***********************************************************
/* Construction, configuration
/***********************************************************
*/
/**
* @since 2.9 (added `includeInViews` since 2.8)
*/
@SuppressWarnings("unchecked")
public BeanPropertyWriter(BeanPropertyDefinition propDef,
AnnotatedMember member, Annotations contextAnnotations,
JavaType declaredType,
JsonSerializer ser, TypeSerializer typeSer, JavaType serType,
boolean suppressNulls, Object suppressableValue,
Class[] includeInViews)
{
super(propDef);
_member = member;
_contextAnnotations = contextAnnotations;
_name = new SerializedString(propDef.getName());
_wrapperName = propDef.getWrapperName();
_declaredType = declaredType;
_serializer = (JsonSerializer) ser;
_dynamicSerializers = (ser == null) ? PropertySerializerMap
.emptyForProperties() : null;
_typeSerializer = typeSer;
_cfgSerializationType = serType;
if (member instanceof AnnotatedField) {
_accessorMethod = null;
_field = (Field) member.getMember();
} else if (member instanceof AnnotatedMethod) {
_accessorMethod = (Method) member.getMember();
_field = null;
} else {
// 01-Dec-2014, tatu: Used to be illegal, but now explicitly allowed
// for virtual props
_accessorMethod = null;
_field = null;
}
_suppressNulls = suppressNulls;
_suppressableValue = suppressableValue;
// this will be resolved later on, unless nulls are to be suppressed
_nullSerializer = null;
_includeInViews = includeInViews;
}
@Deprecated // Since 2.9
public BeanPropertyWriter(BeanPropertyDefinition propDef,
AnnotatedMember member, Annotations contextAnnotations,
JavaType declaredType,
JsonSerializer ser, TypeSerializer typeSer, JavaType serType,
boolean suppressNulls, Object suppressableValue)
{
this(propDef, member, contextAnnotations, declaredType,
ser, typeSer, serType, suppressNulls, suppressableValue,
null);
}
/**
* Constructor that may be of use to virtual properties, when there is need
* for the zero-arg ("default") constructor, and actual initialization is
* done after constructor call.
*
* @since 2.5
*/
protected BeanPropertyWriter() {
super(PropertyMetadata.STD_REQUIRED_OR_OPTIONAL);
_member = null;
_contextAnnotations = null;
_name = null;
_wrapperName = null;
_includeInViews = null;
_declaredType = null;
_serializer = null;
_dynamicSerializers = null;
_typeSerializer = null;
_cfgSerializationType = null;
_accessorMethod = null;
_field = null;
_suppressNulls = false;
_suppressableValue = null;
_nullSerializer = null;
}
/**
* "Copy constructor" to be used by filtering sub-classes
*/
protected BeanPropertyWriter(BeanPropertyWriter base) {
this(base, base._name);
}
/**
* @since 2.5
*/
protected BeanPropertyWriter(BeanPropertyWriter base, PropertyName name) {
super(base);
/*
* 02-Dec-2014, tatu: This is a big mess, alas, what with dependency to
* MapperConfig to encode, and Afterburner having heartburn for
* SerializableString (vs SerializedString). Hope it can be
* resolved/reworked in 2.6 timeframe, if not for 2.5
*/
_name = new SerializedString(name.getSimpleName());
_wrapperName = base._wrapperName;
_contextAnnotations = base._contextAnnotations;
_declaredType = base._declaredType;
_member = base._member;
_accessorMethod = base._accessorMethod;
_field = base._field;
_serializer = base._serializer;
_nullSerializer = base._nullSerializer;
// one more thing: copy internal settings, if any
if (base._internalSettings != null) {
_internalSettings = new HashMap(
base._internalSettings);
}
_cfgSerializationType = base._cfgSerializationType;
_dynamicSerializers = base._dynamicSerializers;
_suppressNulls = base._suppressNulls;
_suppressableValue = base._suppressableValue;
_includeInViews = base._includeInViews;
_typeSerializer = base._typeSerializer;
_nonTrivialBaseType = base._nonTrivialBaseType;
}
protected BeanPropertyWriter(BeanPropertyWriter base, SerializedString name) {
super(base);
_name = name;
_wrapperName = base._wrapperName;
_member = base._member;
_contextAnnotations = base._contextAnnotations;
_declaredType = base._declaredType;
_accessorMethod = base._accessorMethod;
_field = base._field;
_serializer = base._serializer;
_nullSerializer = base._nullSerializer;
if (base._internalSettings != null) {
_internalSettings = new HashMap(
base._internalSettings);
}
_cfgSerializationType = base._cfgSerializationType;
_dynamicSerializers = base._dynamicSerializers;
_suppressNulls = base._suppressNulls;
_suppressableValue = base._suppressableValue;
_includeInViews = base._includeInViews;
_typeSerializer = base._typeSerializer;
_nonTrivialBaseType = base._nonTrivialBaseType;
}
public BeanPropertyWriter rename(NameTransformer transformer) {
String newName = transformer.transform(_name.getValue());
if (newName.equals(_name.toString())) {
return this;
}
return _new(PropertyName.construct(newName));
}
/**
* Overridable factory method used by sub-classes
*
* @since 2.6
*/
protected BeanPropertyWriter _new(PropertyName newName) {
return new BeanPropertyWriter(this, newName);
}
/**
* Method called to set, reset or clear the configured type serializer for
* property.
*
* @since 2.6
*/
public void assignTypeSerializer(TypeSerializer typeSer) {
_typeSerializer = typeSer;
}
/**
* Method called to assign value serializer for property
*/
public void assignSerializer(JsonSerializer ser) {
// may need to disable check in future?
if ((_serializer != null) && (_serializer != ser)) {
throw new IllegalStateException(String.format(
"Cannot override _serializer: had a %s, trying to set to %s",
ClassUtil.classNameOf(_serializer), ClassUtil.classNameOf(ser)));
}
_serializer = ser;
}
/**
* Method called to assign null value serializer for property
*/
public void assignNullSerializer(JsonSerializer nullSer) {
// may need to disable check in future?
if ((_nullSerializer != null) && (_nullSerializer != nullSer)) {
throw new IllegalStateException(String.format(
"Cannot override _nullSerializer: had a %s, trying to set to %s",
ClassUtil.classNameOf(_nullSerializer), ClassUtil.classNameOf(nullSer)));
}
_nullSerializer = nullSer;
}
/**
* Method called create an instance that handles details of unwrapping
* contained value.
*/
public BeanPropertyWriter unwrappingWriter(NameTransformer unwrapper) {
return new UnwrappingBeanPropertyWriter(this, unwrapper);
}
/**
* Method called to define type to consider as "non-trivial" basetype,
* needed for dynamic serialization resolution for complex (usually
* container) types
*/
public void setNonTrivialBaseType(JavaType t) {
_nonTrivialBaseType = t;
}
/**
* Method called to ensure that the mutator has proper access rights to
* be called, as per configuration. Overridden by implementations that
* have mutators that require access, fields and setters.
*
* @since 2.8.3
*/
public void fixAccess(SerializationConfig config) {
_member.fixAccess(config.isEnabled(MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS));
}
/*
/***********************************************************
/* JDK Serializability
/***********************************************************
*/
/*
* Ideally would not require mutable state, and instead would re-create with
* final settings. However, as things are, with sub-types and all, simplest
* to just change Field/Method value directly.
*/
Object readResolve() {
if (_member instanceof AnnotatedField) {
_accessorMethod = null;
_field = (Field) _member.getMember();
} else if (_member instanceof AnnotatedMethod) {
_accessorMethod = (Method) _member.getMember();
_field = null;
}
if (_serializer == null) {
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
}
return this;
}
/*
/************************************************************
/* BeanProperty impl
/***********************************************************
*/
// Note: also part of 'PropertyWriter'
@Override
public String getName() {
return _name.getValue();
}
// Note: also part of 'PropertyWriter'
@Override
public PropertyName getFullName() { // !!! TODO: impl properly
return new PropertyName(_name.getValue());
}
@Override
public JavaType getType() {
return _declaredType;
}
@Override
public PropertyName getWrapperName() {
return _wrapperName;
}
// Note: also part of 'PropertyWriter'
@Override
public A getAnnotation(Class acls) {
return (_member == null) ? null : _member.getAnnotation(acls);
}
// Note: also part of 'PropertyWriter'
@Override
public A getContextAnnotation(Class acls) {
return (_contextAnnotations == null) ? null : _contextAnnotations
.get(acls);
}
@Override
public AnnotatedMember getMember() {
return _member;
}
// @since 2.3 -- needed so it can be overridden by unwrapping writer
protected void _depositSchemaProperty(ObjectNode propertiesNode,
JsonNode schemaNode) {
propertiesNode.set(getName(), schemaNode);
}
/*
/***********************************************************
/* Managing and accessing of opaque internal settings
/* (used by extensions)
/***********************************************************
*/
/**
* Method for accessing value of specified internal setting.
*
* @return Value of the setting, if any; null if none.
*/
public Object getInternalSetting(Object key) {
return (_internalSettings == null) ? null : _internalSettings.get(key);
}
/**
* Method for setting specific internal setting to given value
*
* @return Old value of the setting, if any (null if none)
*/
public Object setInternalSetting(Object key, Object value) {
if (_internalSettings == null) {
_internalSettings = new HashMap();
}
return _internalSettings.put(key, value);
}
/**
* Method for removing entry for specified internal setting.
*
* @return Existing value of the setting, if any (null if none)
*/
public Object removeInternalSetting(Object key) {
Object removed = null;
if (_internalSettings != null) {
removed = _internalSettings.remove(key);
// to reduce memory usage, let's also drop the Map itself, if empty
if (_internalSettings.size() == 0) {
_internalSettings = null;
}
}
return removed;
}
/*
/***********************************************************
/* Accessors
/***********************************************************
*/
public SerializableString getSerializedName() {
return _name;
}
public boolean hasSerializer() {
return _serializer != null;
}
public boolean hasNullSerializer() {
return _nullSerializer != null;
}
/**
* @since 2.6
*/
public TypeSerializer getTypeSerializer() {
return _typeSerializer;
}
/**
* Accessor that will return true if this bean property has to support
* "unwrapping"; ability to replace POJO structural wrapping with optional
* name prefix and/or suffix (or in some cases, just removal of wrapper
* name).
*
* Default implementation simply returns false.
*
* @since 2.3
*/
public boolean isUnwrapping() {
return false;
}
public boolean willSuppressNulls() {
return _suppressNulls;
}
/**
* Method called to check to see if this property has a name that would
* conflict with a given name.
*
* @since 2.6
*/
public boolean wouldConflictWithName(PropertyName name) {
if (_wrapperName != null) {
return _wrapperName.equals(name);
}
// Bit convoluted since our support for namespaces is spotty but:
return name.hasSimpleName(_name.getValue()) && !name.hasNamespace();
}
// Needed by BeanSerializer#getSchema
public JsonSerializer getSerializer() {
return _serializer;
}
public JavaType getSerializationType() {
return _cfgSerializationType;
}
@Deprecated // since 2.9
public Class getRawSerializationType() {
return (_cfgSerializationType == null) ? null : _cfgSerializationType
.getRawClass();
}
/**
* @deprecated Since 2.7, to be removed from 2.9, use {@link #getType()} instead.
*/
@Deprecated
public Class getPropertyType() {
if (_accessorMethod != null) {
return _accessorMethod.getReturnType();
}
if (_field != null) {
return _field.getType();
}
return null;
}
/**
* Get the generic property type of this property writer.
*
* @return The property type, or null if not found.
*
* @deprecated Since 2.7, to be removed from 2.9, use {@link #getType()} instead.
*/
@Deprecated
public Type getGenericPropertyType() {
if (_accessorMethod != null) {
return _accessorMethod.getGenericReturnType();
}
if (_field != null) {
return _field.getGenericType();
}
return null;
}
public Class[] getViews() {
return _includeInViews;
}
/*
/***********************************************************
/* PropertyWriter methods (serialization)
/***********************************************************
*/
/**
* Method called to access property that this bean stands for, from within
* given bean, and to serialize it as a JSON Object field using appropriate
* serializer.
*/
@Override
public void serializeAsField(Object bean, JsonGenerator gen,
SerializerProvider prov) throws Exception {
// inlined 'get()'
final Object value = (_accessorMethod == null) ? _field.get(bean)
: _accessorMethod.invoke(bean, (Object[]) null);
// Null handling is bit different, check that first
if (value == null) {
// 20-Jun-2022, tatu: Defer checking of null, see [databind#3481]
if((_suppressableValue != null)
&& prov.includeFilterSuppressNulls(_suppressableValue)) {
return;
}
if (_nullSerializer != null) {
gen.writeFieldName(_name);
_nullSerializer.serialize(null, gen, prov);
}
return;
}
// then find serializer to use
JsonSerializer ser = _serializer;
if (ser == null) {
Class cls = value.getClass();
PropertySerializerMap m = _dynamicSerializers;
ser = m.serializerFor(cls);
if (ser == null) {
ser = _findAndAddDynamic(m, cls, prov);
}
}
// and then see if we must suppress certain values (default, empty)
if (_suppressableValue != null) {
if (MARKER_FOR_EMPTY == _suppressableValue) {
if (ser.isEmpty(prov, value)) {
return;
}
} else if (_suppressableValue.equals(value)) {
return;
}
}
// For non-nulls: simple check for direct cycles
if (value == bean) {
// four choices: exception; handled by call; pass-through or write null
if (_handleSelfReference(bean, gen, prov, ser)) {
return;
}
}
gen.writeFieldName(_name);
if (_typeSerializer == null) {
ser.serialize(value, gen, prov);
} else {
ser.serializeWithType(value, gen, prov, _typeSerializer);
}
}
/**
* Method called to indicate that serialization of a field was omitted due
* to filtering, in cases where backend data format does not allow basic
* omission.
*
* @since 2.3
*/
@Override
public void serializeAsOmittedField(Object bean, JsonGenerator gen,
SerializerProvider prov) throws Exception {
if (!gen.canOmitFields()) {
gen.writeOmittedField(_name.getValue());
}
}
/**
* Alternative to {@link #serializeAsField} that is used when a POJO is
* serialized as JSON Array; the difference is that no field names are
* written.
*
* @since 2.3
*/
@Override
public void serializeAsElement(Object bean, JsonGenerator gen,
SerializerProvider prov) throws Exception {
// inlined 'get()'
final Object value = (_accessorMethod == null) ? _field.get(bean)
: _accessorMethod.invoke(bean, (Object[]) null);
if (value == null) { // nulls need specialized handling
if (_nullSerializer != null) {
_nullSerializer.serialize(null, gen, prov);
} else { // can NOT suppress entries in tabular output
gen.writeNull();
}
return;
}
// otherwise find serializer to use
JsonSerializer ser = _serializer;
if (ser == null) {
Class cls = value.getClass();
PropertySerializerMap map = _dynamicSerializers;
ser = map.serializerFor(cls);
if (ser == null) {
ser = _findAndAddDynamic(map, cls, prov);
}
}
// and then see if we must suppress certain values (default, empty)
if (_suppressableValue != null) {
if (MARKER_FOR_EMPTY == _suppressableValue) {
if (ser.isEmpty(prov, value)) { // can NOT suppress entries in
// tabular output
serializeAsPlaceholder(bean, gen, prov);
return;
}
} else if (_suppressableValue.equals(value)) {
// can NOT suppress entries in tabular output
serializeAsPlaceholder(bean, gen, prov);
return;
}
}
// For non-nulls: simple check for direct cycles
if (value == bean) {
if (_handleSelfReference(bean, gen, prov, ser)) {
return;
}
}
if (_typeSerializer == null) {
ser.serialize(value, gen, prov);
} else {
ser.serializeWithType(value, gen, prov, _typeSerializer);
}
}
/**
* Method called to serialize a placeholder used in tabular output when real
* value is not to be included (is filtered out), but when we need an entry
* so that field indexes will not be off. Typically this should output null
* or empty String, depending on datatype.
*
* @since 2.1
*/
@Override
public void serializeAsPlaceholder(Object bean, JsonGenerator gen,
SerializerProvider prov) throws Exception {
if (_nullSerializer != null) {
_nullSerializer.serialize(null, gen, prov);
} else {
gen.writeNull();
}
}
/*
/***********************************************************
/* PropertyWriter methods (schema generation)
/***********************************************************
*/
// Also part of BeanProperty implementation
@Override
public void depositSchemaProperty(JsonObjectFormatVisitor v,
SerializerProvider provider) throws JsonMappingException {
if (v != null) {
if (isRequired()) {
v.property(this);
} else {
v.optionalProperty(this);
}
}
}
// // // Legacy support for JsonFormatVisitable
/**
* Attempt to add the output of the given {@link BeanPropertyWriter} in the
* given {@link ObjectNode}. Otherwise, add the default schema
* {@link JsonNode} in place of the writer's output
*
* @param propertiesNode
* Node which the given property would exist within
* @param provider
* Provider that can be used for accessing dynamic aspects of
* serialization processing
*/
@Override
@Deprecated
public void depositSchemaProperty(ObjectNode propertiesNode,
SerializerProvider provider) throws JsonMappingException {
JavaType propType = getSerializationType();
// 03-Dec-2010, tatu: SchemaAware REALLY should use JavaType, but alas
// it doesn't...
Type hint = (propType == null) ? getType() : propType.getRawClass();
JsonNode schemaNode;
// Maybe it already has annotated/statically configured serializer?
JsonSerializer ser = getSerializer();
if (ser == null) { // nope
ser = provider.findValueSerializer(getType(), this);
}
boolean isOptional = !isRequired();
if (ser instanceof com.fasterxml.jackson.databind.jsonschema.SchemaAware) {
schemaNode = ((com.fasterxml.jackson.databind.jsonschema.SchemaAware) ser).getSchema(provider, hint,
isOptional);
} else {
schemaNode = com.fasterxml.jackson.databind.jsonschema.JsonSchema
.getDefaultSchemaNode();
}
_depositSchemaProperty(propertiesNode, schemaNode);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
protected JsonSerializer _findAndAddDynamic(
PropertySerializerMap map, Class type,
SerializerProvider provider) throws JsonMappingException {
PropertySerializerMap.SerializerAndMapResult result;
if (_nonTrivialBaseType != null) {
JavaType t = provider.constructSpecializedType(_nonTrivialBaseType,
type);
result = map.findAndAddPrimarySerializer(t, provider, this);
} else {
result = map.findAndAddPrimarySerializer(type, provider, this);
}
// did we get a new map of serializers? If so, start using it
if (map != result.map) {
_dynamicSerializers = result.map;
}
return result.serializer;
}
/**
* Method that can be used to access value of the property this Object
* describes, from given bean instance.
*
* Note: method is final as it should not need to be overridden -- rather,
* calling method(s) ({@link #serializeAsField}) should be overridden to
* change the behavior
*/
public final Object get(Object bean) throws Exception {
return (_accessorMethod == null) ? _field.get(bean) : _accessorMethod
.invoke(bean, (Object[]) null);
}
/**
* Method called to handle a direct self-reference through this property.
* Method can choose to indicate an error by throwing
* {@link JsonMappingException}; fully handle serialization (and return
* true); or indicate that it should be serialized normally (return false).
*
* Default implementation will throw {@link JsonMappingException} if
* {@link SerializationFeature#FAIL_ON_SELF_REFERENCES} is enabled; or
* return false if it is disabled.
*
* @return True if method fully handled self-referential value; false if not
* (caller is to handle it) or {@link JsonMappingException} if there
* is no way handle it
*/
protected boolean _handleSelfReference(Object bean, JsonGenerator gen,
SerializerProvider prov, JsonSerializer ser)
throws IOException
{
if (!ser.usesObjectId()) {
if (prov.isEnabled(SerializationFeature.FAIL_ON_SELF_REFERENCES)) {
// 05-Feb-2013, tatu: Usually a problem, but NOT if we are handling
// object id; this may be the case for BeanSerializers at least.
// 13-Feb-2014, tatu: another possible ok case: custom serializer
// (something OTHER than {@link BeanSerializerBase}
if (ser instanceof BeanSerializerBase) {
prov.reportBadDefinition(getType(), "Direct self-reference leading to cycle");
}
} else if (prov.isEnabled(SerializationFeature.WRITE_SELF_REFERENCES_AS_NULL)) {
if (_nullSerializer != null) {
// 23-Oct-2019, tatu: Tricky part -- caller does not specify if it's
// "as property" (in JSON Object) or "as element" (JSON array, via
// 'POJO-as-array'). And since Afterburner calls method can not easily
// start passing info either. So check generator to see...
// (note: not considering ROOT context as possibility, does not seem legal)
if (!gen.getOutputContext().inArray()) {
gen.writeFieldName(_name);
}
_nullSerializer.serialize(null, gen, prov);
}
return true;
}
}
return false;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(40);
sb.append("property '").append(getName()).append("' (");
if (_accessorMethod != null) {
sb.append("via method ")
.append(_accessorMethod.getDeclaringClass().getName())
.append("#").append(_accessorMethod.getName());
} else if (_field != null) {
sb.append("field \"").append(_field.getDeclaringClass().getName())
.append("#").append(_field.getName());
} else {
sb.append("virtual");
}
if (_serializer == null) {
sb.append(", no static serializer");
} else {
sb.append(", static serializer of type "
+ _serializer.getClass().getName());
}
sb.append(')');
return sb.toString();
}
}
