com.fasterxml.jackson.databind.ser.BeanSerializerBuilder Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.ser;
import java.util.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.introspect.AnnotatedClass;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.ser.impl.ObjectIdWriter;
/**
* Builder class used for aggregating deserialization information about
* a POJO, in order to build a {@link JsonSerializer} for serializing
* instances.
* Main reason for using separate builder class is that this makes it easier
* to make actual serializer class fully immutable.
*/
public class BeanSerializerBuilder
{
private final static BeanPropertyWriter[] NO_PROPERTIES = new BeanPropertyWriter[0];
/*
/**********************************************************
/* Basic configuration we start with
/**********************************************************
*/
final protected BeanDescription _beanDesc;
protected SerializationConfig _config;
/*
/**********************************************************
/* Accumulated information about properties
/**********************************************************
*/
/**
* Bean properties, in order of serialization
*/
protected List _properties = Collections.emptyList();
/**
* Optional array of filtered property writers; if null, no
* view-based filtering is performed.
*/
protected BeanPropertyWriter[] _filteredProperties;
/**
* Writer used for "any getter" properties, if any.
*/
protected AnyGetterWriter _anyGetter;
/**
* Id of the property filter to use for POJO, if any.
*/
protected Object _filterId;
/**
* Property that is used for type id (and not serialized as regular
* property)
*/
protected AnnotatedMember _typeId;
/**
* Object responsible for serializing Object Ids for the handled
* type, if any.
*/
protected ObjectIdWriter _objectIdWriter;
/*
/**********************************************************
/* Construction and setter methods
/**********************************************************
*/
public BeanSerializerBuilder(BeanDescription beanDesc) {
_beanDesc = beanDesc;
}
/**
* Copy-constructor that may be used for sub-classing
*/
protected BeanSerializerBuilder(BeanSerializerBuilder src) {
_beanDesc = src._beanDesc;
_config = src._config;
_properties = src._properties;
_filteredProperties = src._filteredProperties;
_anyGetter = src._anyGetter;
_filterId = src._filterId;
_typeId = src._typeId;
_objectIdWriter = src._objectIdWriter;
}
/**
* Initialization method called right after construction, to specify
* configuration to use.
*
* Note: ideally should be passed in constructor, but for backwards
* compatibility, needed to add a setter instead
*
* @since 2.1
*/
protected void setConfig(SerializationConfig config) {
_config = config;
}
public void setProperties(List properties) {
_properties = properties;
}
/**
* @param properties Number and order of properties here MUST match that
* of "regular" properties set earlier using {@link #setProperties(List)}; if not,
* an {@link IllegalArgumentException} will be thrown
*/
public void setFilteredProperties(BeanPropertyWriter[] properties) {
if (properties != null) {
if (properties.length != _properties.size()) { // as per [databind#1612]
throw new IllegalArgumentException(String.format(
"Trying to set %d filtered properties; must match length of non-filtered `properties` (%d)",
properties.length, _properties.size()));
}
}
_filteredProperties = properties;
}
public void setAnyGetter(AnyGetterWriter anyGetter) {
_anyGetter = anyGetter;
}
public void setFilterId(Object filterId) {
_filterId = filterId;
}
public void setTypeId(AnnotatedMember idProp) {
// Not legal to use multiple ones...
if (_typeId != null) {
throw new IllegalArgumentException("Multiple type ids specified with "+_typeId+" and "+idProp);
}
_typeId = idProp;
}
public void setObjectIdWriter(ObjectIdWriter w) {
_objectIdWriter = w;
}
/*
/**********************************************************
/* Accessors for things BeanSerializer cares about:
/* note -- likely to change between minor revisions
/* by new methods getting added.
/**********************************************************
*/
public AnnotatedClass getClassInfo() { return _beanDesc.getClassInfo(); }
public BeanDescription getBeanDescription() { return _beanDesc; }
public List getProperties() { return _properties; }
public boolean hasProperties() {
return (_properties != null) && (_properties.size() > 0);
}
public BeanPropertyWriter[] getFilteredProperties() { return _filteredProperties; }
public AnyGetterWriter getAnyGetter() { return _anyGetter; }
public Object getFilterId() { return _filterId; }
public AnnotatedMember getTypeId() { return _typeId; }
public ObjectIdWriter getObjectIdWriter() { return _objectIdWriter; }
/*
/**********************************************************
/* Build methods for actually creating serializer instance
/**********************************************************
*/
/**
* Method called to create {@link BeanSerializer} instance with
* all accumulated information. Will construct a serializer if we
* have enough information, or return null if not.
*/
public JsonSerializer build()
{
// [databind#2789]: There can be a case wherein `_typeId` is used, but
// nothing else. Rare but has happened; so force access.
if (_typeId != null) {
if (_config.isEnabled(MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS)) {
_typeId.fixAccess(_config.isEnabled(MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS));
}
}
if (_anyGetter != null) {
_anyGetter.fixAccess(_config);
}
BeanPropertyWriter[] properties;
// No properties, any getter or object id writer?
// No real serializer; caller gets to handle
if (_properties == null || _properties.isEmpty()) {
if (_anyGetter == null && _objectIdWriter == null) {
// NOTE! Caller may still call `createDummy()` later on
return null;
}
properties = NO_PROPERTIES;
} else {
properties = _properties.toArray(new BeanPropertyWriter[_properties.size()]);
if (_config.isEnabled(MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS)) {
for (int i = 0, end = properties.length; i < end; ++i) {
properties[i].fixAccess(_config);
}
}
}
// 27-Apr-2017, tatu: Verify that filtered-properties settings are compatible
if (_filteredProperties != null) {
if (_filteredProperties.length != _properties.size()) { // lgtm [java/dereferenced-value-may-be-null]
throw new IllegalStateException(String.format(
"Mismatch between `properties` size (%d), `filteredProperties` (%s): should have as many (or `null` for latter)",
_properties.size(), _filteredProperties.length));
}
}
return new BeanSerializer(_beanDesc.getType(), this,
properties, _filteredProperties);
}
/**
* Factory method for constructing an "empty" serializer; one that
* outputs no properties (but handles JSON objects properly, including
* type information)
*/
public BeanSerializer createDummy() {
// 20-Sep-2019, tatu: Can not skimp on passing builder (see [databind#2077])
return BeanSerializer.createDummy(_beanDesc.getType(), this);
}
}