PropertyBuilder.java
package com.fasterxml.jackson.databind.ser;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.util.*;
/**
* Helper class for {@link BeanSerializerFactory} that is used to
* construct {@link BeanPropertyWriter} instances. Can be sub-classed
* to change behavior.
*/
public class PropertyBuilder
{
// @since 2.7
private final static Object NO_DEFAULT_MARKER = Boolean.FALSE;
final protected SerializationConfig _config;
final protected BeanDescription _beanDesc;
final protected AnnotationIntrospector _annotationIntrospector;
/**
* If a property has serialization inclusion value of
* {@link com.fasterxml.jackson.annotation.JsonInclude.Include#NON_DEFAULT},
* we may need to know the default value of the bean, to know if property value
* equals default one.
*<p>
* NOTE: only used if enclosing class defines NON_DEFAULT, but NOT if it is the
* global default OR per-property override.
*/
protected Object _defaultBean;
/**
* Default inclusion mode for properties of the POJO for which
* properties are collected; possibly overridden on
* per-property basis. Combines global inclusion defaults and
* per-type (annotation and type-override) inclusion overrides.
*/
final protected JsonInclude.Value _defaultInclusion;
/**
* Marker flag used to indicate that "real" default values are to be used
* for properties, as per per-type value inclusion of type <code>NON_DEFAULT</code>
*
* @since 2.8
*/
final protected boolean _useRealPropertyDefaults;
public PropertyBuilder(SerializationConfig config, BeanDescription beanDesc)
{
_config = config;
_beanDesc = beanDesc;
// 08-Sep-2016, tatu: This gets tricky, with 3 levels of definitions:
// (a) global default inclusion
// (b) per-type default inclusion (from annotation or config overrides;
// config override having precedence)
// (c) per-property override (from annotation on specific property or
// config overrides per type of property;
// annotation having precedence)
//
// and not only requiring merging, but also considering special handling
// for NON_DEFAULT in case of (b) (vs (a) or (c))
JsonInclude.Value inclPerType = JsonInclude.Value.merge(
beanDesc.findPropertyInclusion(JsonInclude.Value.empty()),
config.getDefaultPropertyInclusion(beanDesc.getBeanClass(),
JsonInclude.Value.empty()));
_defaultInclusion = JsonInclude.Value.merge(config.getDefaultPropertyInclusion(),
inclPerType);
_useRealPropertyDefaults = inclPerType.getValueInclusion() == JsonInclude.Include.NON_DEFAULT;
_annotationIntrospector = _config.getAnnotationIntrospector();
}
/*
/**********************************************************
/* Public API
/**********************************************************
*/
public Annotations getClassAnnotations() {
return _beanDesc.getClassAnnotations();
}
/**
* @param contentTypeSer Optional explicit type information serializer
* to use for contained values (only used for properties that are
* of container type)
*/
protected BeanPropertyWriter buildWriter(SerializerProvider prov,
BeanPropertyDefinition propDef, JavaType declaredType, JsonSerializer<?> ser,
TypeSerializer typeSer, TypeSerializer contentTypeSer,
AnnotatedMember am, boolean defaultUseStaticTyping)
throws JsonMappingException
{
// do we have annotation that forces type to use (to declared type or its super type)?
JavaType serializationType;
try {
serializationType = findSerializationType(am, defaultUseStaticTyping, declaredType);
} catch (JsonMappingException e) {
if (propDef == null) {
return prov.reportBadDefinition(declaredType, ClassUtil.exceptionMessage(e));
}
return prov.reportBadPropertyDefinition(_beanDesc, propDef, ClassUtil.exceptionMessage(e));
}
// Container types can have separate type serializers for content (value / element) type
if (contentTypeSer != null) {
// 04-Feb-2010, tatu: Let's force static typing for collection, if there is
// type information for contents. Should work well (for JAXB case); can be
// revisited if this causes problems.
if (serializationType == null) {
// serializationType = TypeFactory.type(am.getGenericType(), _beanDesc.getType());
serializationType = declaredType;
}
JavaType ct = serializationType.getContentType();
// Not exactly sure why, but this used to occur; better check explicitly:
if (ct == null) {
prov.reportBadPropertyDefinition(_beanDesc, propDef,
"serialization type "+serializationType+" has no content");
}
serializationType = serializationType.withContentTypeHandler(contentTypeSer);
ct = serializationType.getContentType();
}
Object valueToSuppress = null;
boolean suppressNulls = false;
// 12-Jul-2016, tatu: [databind#1256] Need to make sure we consider type refinement
JavaType actualType = (serializationType == null) ? declaredType : serializationType;
// 17-Mar-2017: [databind#1522] Allow config override per property type
AnnotatedMember accessor = propDef.getAccessor(); // lgtm [java/dereferenced-value-may-be-null]
if (accessor == null) {
// neither Setter nor ConstructorParameter are expected here
return prov.reportBadPropertyDefinition(_beanDesc, propDef,
"could not determine property type");
}
Class<?> rawPropertyType = accessor.getRawType();
// 17-Aug-2016, tatu: Default inclusion covers global default (for all types), as well
// as type-default for enclosing POJO. What we need, then, is per-type default (if any)
// for declared property type... and finally property annotation overrides
JsonInclude.Value inclV = _config.getDefaultInclusion(actualType.getRawClass(),
rawPropertyType, _defaultInclusion);
// property annotation override
inclV = inclV.withOverrides(propDef.findInclusion());
JsonInclude.Include inclusion = inclV.getValueInclusion();
if (inclusion == JsonInclude.Include.USE_DEFAULTS) { // should not occur but...
inclusion = JsonInclude.Include.ALWAYS;
}
switch (inclusion) {
case NON_DEFAULT:
// 11-Nov-2015, tatu: This is tricky because semantics differ between cases,
// so that if enclosing class has this, we may need to access values of property,
// whereas for global defaults OR per-property overrides, we have more
// static definition. Sigh.
// First: case of class/type specifying it; try to find POJO property defaults
Object defaultBean;
// 16-Oct-2016, tatu: Note: if we cannot for some reason create "default instance",
// revert logic to the case of general/per-property handling, so both
// type-default AND null are to be excluded.
// (as per [databind#1417]
if (_useRealPropertyDefaults && (defaultBean = getDefaultBean()) != null) {
// 07-Sep-2016, tatu: may also need to front-load access forcing now
if (prov.isEnabled(MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS)) {
am.fixAccess(_config.isEnabled(MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS));
}
try {
valueToSuppress = am.getValue(defaultBean);
} catch (Exception e) {
_throwWrapped(e, propDef.getName(), defaultBean);
}
} else {
valueToSuppress = BeanUtil.getDefaultValue(actualType);
suppressNulls = true;
}
if (valueToSuppress == null) {
suppressNulls = true;
} else {
if (valueToSuppress.getClass().isArray()) {
valueToSuppress = ArrayBuilders.getArrayComparator(valueToSuppress);
}
}
break;
case NON_ABSENT: // new with 2.6, to support Guava/JDK8 Optionals
// always suppress nulls
suppressNulls = true;
// and for referential types, also "empty", which in their case means "absent"
if (actualType.isReferenceType()) {
valueToSuppress = BeanPropertyWriter.MARKER_FOR_EMPTY;
}
break;
case NON_EMPTY:
// always suppress nulls
suppressNulls = true;
// but possibly also 'empty' values:
valueToSuppress = BeanPropertyWriter.MARKER_FOR_EMPTY;
break;
case CUSTOM: // new with 2.9
valueToSuppress = prov.includeFilterInstance(propDef, inclV.getValueFilter());
break;
case NON_NULL:
suppressNulls = true;
// fall through
case ALWAYS: // default
default:
// we may still want to suppress empty collections
@SuppressWarnings("deprecation")
final SerializationFeature emptyJsonArrays = SerializationFeature.WRITE_EMPTY_JSON_ARRAYS;
if (actualType.isContainerType() && !_config.isEnabled(emptyJsonArrays)) {
valueToSuppress = BeanPropertyWriter.MARKER_FOR_EMPTY;
}
break;
}
Class<?>[] views = propDef.findViews();
if (views == null) {
views = _beanDesc.findDefaultViews();
}
BeanPropertyWriter bpw = _constructPropertyWriter(propDef,
am, _beanDesc.getClassAnnotations(), declaredType,
ser, typeSer, serializationType, suppressNulls, valueToSuppress, views);
// How about custom null serializer?
Object serDef = _annotationIntrospector.findNullSerializer(am);
if (serDef != null) {
bpw.assignNullSerializer(prov.serializerInstance(am, serDef));
}
// And then, handling of unwrapping
NameTransformer unwrapper = _annotationIntrospector.findUnwrappingNameTransformer(am);
if (unwrapper != null) {
bpw = bpw.unwrappingWriter(unwrapper);
}
return bpw;
}
/**
* Overridable factory method for actual construction of {@link BeanPropertyWriter};
* often needed if subclassing {@link #buildWriter} method.
*
* @since 2.12
*/
protected BeanPropertyWriter _constructPropertyWriter(BeanPropertyDefinition propDef,
AnnotatedMember member, Annotations contextAnnotations,
JavaType declaredType,
JsonSerializer<?> ser, TypeSerializer typeSer, JavaType serType,
boolean suppressNulls, Object suppressableValue,
Class<?>[] includeInViews)
throws JsonMappingException
{
return new BeanPropertyWriter(propDef,
member, contextAnnotations, declaredType,
ser, typeSer, serType, suppressNulls, suppressableValue, includeInViews);
}
/*
/**********************************************************
/* Helper methods; annotation access
/**********************************************************
*/
/**
* Method that will try to determine statically defined type of property
* being serialized, based on annotations (for overrides), and alternatively
* declared type (if static typing for serialization is enabled).
* If neither can be used (no annotations, dynamic typing), returns null.
*/
protected JavaType findSerializationType(Annotated a, boolean useStaticTyping, JavaType declaredType)
throws JsonMappingException
{
JavaType secondary = _annotationIntrospector.refineSerializationType(_config, a, declaredType);
// 11-Oct-2015, tatu: As of 2.7, not 100% sure following checks are needed. But keeping
// for now, just in case
if (secondary != declaredType) {
Class<?> serClass = secondary.getRawClass();
// Must be a super type to be usable
Class<?> rawDeclared = declaredType.getRawClass();
if (serClass.isAssignableFrom(rawDeclared)) {
; // fine as is
} else {
/* 18-Nov-2010, tatu: Related to fixing [JACKSON-416], an issue with such
* check is that for deserialization more specific type makes sense;
* and for serialization more generic. But alas JAXB uses but a single
* annotation to do both... Hence, we must just discard type, as long as
* types are related
*/
if (!rawDeclared.isAssignableFrom(serClass)) {
throw new IllegalArgumentException("Illegal concrete-type annotation for method '"+a.getName()+"': class "+serClass.getName()+" not a super-type of (declared) class "+rawDeclared.getName());
}
/* 03-Dec-2010, tatu: Actually, ugh, we may need to further relax this
* and actually accept subtypes too for serialization. Bit dangerous in theory
* but need to trust user here...
*/
}
useStaticTyping = true;
declaredType = secondary;
}
// If using static typing, declared type is known to be the type...
JsonSerialize.Typing typing = _annotationIntrospector.findSerializationTyping(a);
if ((typing != null) && (typing != JsonSerialize.Typing.DEFAULT_TYPING)) {
useStaticTyping = (typing == JsonSerialize.Typing.STATIC);
}
if (useStaticTyping) {
// 11-Oct-2015, tatu: Make sure JavaType also "knows" static-ness...
return declaredType.withStaticTyping();
}
return null;
}
/*
/**********************************************************
/* Helper methods for default value handling
/**********************************************************
*/
protected Object getDefaultBean()
{
Object def = _defaultBean;
if (def == null) {
/* If we can fix access rights, we should; otherwise non-public
* classes or default constructor will prevent instantiation
*/
def = _beanDesc.instantiateBean(_config.canOverrideAccessModifiers());
if (def == null) {
// 06-Nov-2015, tatu: As per [databind#998], do not fail.
/*
Class<?> cls = _beanDesc.getClassInfo().getAnnotated();
throw new IllegalArgumentException("Class "+cls.getName()+" has no default constructor; cannot instantiate default bean value to support 'properties=JsonSerialize.Inclusion.NON_DEFAULT' annotation");
*/
// And use a marker
def = NO_DEFAULT_MARKER;
}
_defaultBean = def;
}
return (def == NO_DEFAULT_MARKER) ? null : _defaultBean;
}
/**
* Accessor used to find out "default value" for given property, to use for
* comparing values to serialize, to determine whether to exclude value from serialization with
* inclusion type of {@link com.fasterxml.jackson.annotation.JsonInclude.Include#NON_DEFAULT}.
* This method is called when we specifically want to know default value within context
* of a POJO, when annotation is within containing class, and not for property or
* defined as global baseline.
*<p>
* Note that returning of pseudo-type
* {@link com.fasterxml.jackson.annotation.JsonInclude.Include#NON_EMPTY} requires special handling.
*
* @since 2.7
* @deprecated Since 2.9 since this will not allow determining difference between "no default instance"
* case and default being `null`.
*/
@Deprecated // since 2.9
protected Object getPropertyDefaultValue(String name, AnnotatedMember member,
JavaType type)
{
Object defaultBean = getDefaultBean();
if (defaultBean == null) {
return getDefaultValue(type);
}
try {
return member.getValue(defaultBean);
} catch (Exception e) {
return _throwWrapped(e, name, defaultBean);
}
}
/**
* @deprecated Since 2.9
*/
@Deprecated // since 2.9
protected Object getDefaultValue(JavaType type) {
return BeanUtil.getDefaultValue(type);
}
/*
/**********************************************************
/* Helper methods for exception handling
/**********************************************************
*/
protected Object _throwWrapped(Exception e, String propName, Object defaultBean)
{
Throwable t = e;
while (t.getCause() != null) {
t = t.getCause();
}
ClassUtil.throwIfError(t);
ClassUtil.throwIfRTE(t);
throw new IllegalArgumentException("Failed to get property '"+propName+"' of default "+defaultBean.getClass().getName()+" instance");
}
}