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com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase Maven / Gradle / Ivy
General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.ser.std;
import java.io.IOException;
import java.lang.reflect.Type;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonschema.SchemaAware;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.ContainerSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;
/**
* Base class for serializers that will output contents as JSON
* arrays; typically serializers used for {@link java.util.Collection}
* and array types.
*/
@SuppressWarnings("serial")
public abstract class AsArraySerializerBase
extends ContainerSerializer
implements ContextualSerializer
{
protected final JavaType _elementType;
/**
* Collection-valued property being serialized with this instance
*/
protected final BeanProperty _property;
protected final boolean _staticTyping;
/**
* Setting for specific local override for "unwrap single element arrays":
* true for enable unwrapping, false for preventing it, `null` for using
* global configuration.
*
* @since 2.6
*/
protected final Boolean _unwrapSingle;
/**
* Type serializer used for values, if any.
*/
protected final TypeSerializer _valueTypeSerializer;
/**
* Value serializer to use, if it can be statically determined
*/
protected final JsonSerializer _elementSerializer;
/**
* If element type can not be statically determined, mapping from
* runtime type to serializer is handled using this object
*/
protected PropertySerializerMap _dynamicSerializers;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
/**
* Non-contextual, "blueprint" constructor typically called when the first
* instance is created, without knowledge of property it was used via.
*
* @since 2.6
*/
protected AsArraySerializerBase(Class cls, JavaType et, boolean staticTyping,
TypeSerializer vts, JsonSerializer elementSerializer)
{
super(cls, false);
_elementType = et;
// static if explicitly requested, or if element type is final
_staticTyping = staticTyping || (et != null && et.isFinal());
_valueTypeSerializer = vts;
_property = null;
_elementSerializer = elementSerializer;
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
_unwrapSingle = null;
}
/**
* @deprecated Since 2.6 Use variants that either take 'src', or do NOT pass
* BeanProperty
*/
@Deprecated
protected AsArraySerializerBase(Class cls, JavaType et, boolean staticTyping,
TypeSerializer vts, BeanProperty property, JsonSerializer elementSerializer)
{
// typing with generics is messy... have to resort to this:
super(cls, false);
_elementType = et;
// static if explicitly requested, or if element type is final
_staticTyping = staticTyping || (et != null && et.isFinal());
_valueTypeSerializer = vts;
_property = property;
_elementSerializer = elementSerializer;
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
_unwrapSingle = null;
}
@SuppressWarnings("unchecked")
protected AsArraySerializerBase(AsArraySerializerBase src,
BeanProperty property, TypeSerializer vts, JsonSerializer elementSerializer,
Boolean unwrapSingle)
{
super(src);
_elementType = src._elementType;
_staticTyping = src._staticTyping;
_valueTypeSerializer = vts;
_property = property;
_elementSerializer = (JsonSerializer) elementSerializer;
_dynamicSerializers = src._dynamicSerializers;
_unwrapSingle = unwrapSingle;
}
/**
* @deprecated since 2.6: use the overloaded method that takes 'unwrapSingle'
*/
@Deprecated
protected AsArraySerializerBase(AsArraySerializerBase src,
BeanProperty property, TypeSerializer vts, JsonSerializer elementSerializer)
{
this(src, property, vts, elementSerializer, src._unwrapSingle);
}
/**
* @deprecated since 2.6: use the overloaded method that takes 'unwrapSingle'
*/
@Deprecated
public final AsArraySerializerBase withResolved(BeanProperty property,
TypeSerializer vts, JsonSerializer elementSerializer) {
return withResolved(property, vts, elementSerializer, _unwrapSingle);
}
/**
* @since 2.6
*/
public abstract AsArraySerializerBase withResolved(BeanProperty property,
TypeSerializer vts, JsonSerializer elementSerializer,
Boolean unwrapSingle);
/*
/**********************************************************
/* Post-processing
/**********************************************************
*/
/**
* This method is needed to resolve contextual annotations like
* per-property overrides, as well as do recursive call
* to createContextual of content serializer, if
* known statically.
*/
@Override
public JsonSerializer createContextual(SerializerProvider provider,
BeanProperty property)
throws JsonMappingException
{
TypeSerializer typeSer = _valueTypeSerializer;
if (typeSer != null) {
typeSer = typeSer.forProperty(property);
}
/* 29-Sep-2012, tatu: Actually, we need to do much more contextual
* checking here since we finally know for sure the property,
* and it may have overrides
*/
JsonSerializer ser = null;
Boolean unwrapSingle = null;
// First: if we have a property, may have property-annotation overrides
if (property != null) {
final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
AnnotatedMember m = property.getMember();
if (m != null) {
Object serDef = intr.findContentSerializer(m);
if (serDef != null) {
ser = provider.serializerInstance(m, serDef);
}
}
JsonFormat.Value format = property.findPropertyFormat(provider.getConfig(), _handledType);
if (format != null) {
unwrapSingle = format.getFeature(JsonFormat.Feature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED);
}
}
if (ser == null) {
ser = _elementSerializer;
}
// 18-Feb-2013, tatu: May have a content converter:
ser = findConvertingContentSerializer(provider, property, ser);
if (ser == null) {
// 30-Sep-2012, tatu: One more thing -- if explicit content type is annotated,
// we can consider it a static case as well.
if (_elementType != null) {
if (_staticTyping && !_elementType.isJavaLangObject()) {
ser = provider.findValueSerializer(_elementType, property);
}
}
} else {
ser = provider.handleSecondaryContextualization(ser, property);
}
if ((ser != _elementSerializer)
|| (property != _property)
|| (_valueTypeSerializer != typeSer)
|| (_unwrapSingle != unwrapSingle)) {
return withResolved(property, typeSer, ser, unwrapSingle);
}
return this;
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _elementType;
}
@Override
public JsonSerializer getContentSerializer() {
return _elementSerializer;
}
/*
/**********************************************************
/* Serialization
/**********************************************************
*/
// NOTE: as of 2.5, sub-classes SHOULD override (in 2.4 and before, was final),
// at least if they can provide access to actual size of value and use `writeStartArray()`
// variant that passes size of array to output, which is helpful with some data formats
@Override
public void serialize(T value, JsonGenerator gen, SerializerProvider provider) throws IOException
{
if (provider.isEnabled(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED)
&& hasSingleElement(value)) {
serializeContents(value, gen, provider);
return;
}
gen.writeStartArray();
// [databind#631]: Assign current value, to be accessible by custom serializers
gen.setCurrentValue(value);
serializeContents(value, gen, provider);
gen.writeEndArray();
}
@Override
public void serializeWithType(T value, JsonGenerator gen, SerializerProvider provider,
TypeSerializer typeSer) throws IOException
{
// note: let's NOT consider [JACKSON-805] here; gets too complicated, and probably just won't work
typeSer.writeTypePrefixForArray(value, gen);
// [databind#631]: Assign current value, to be accessible by custom serializers
gen.setCurrentValue(value);
serializeContents(value, gen, provider);
typeSer.writeTypeSuffixForArray(value, gen);
}
protected abstract void serializeContents(T value, JsonGenerator gen, SerializerProvider provider)
throws IOException;
@SuppressWarnings("deprecation")
@Override
public JsonNode getSchema(SerializerProvider provider, Type typeHint)
throws JsonMappingException
{
ObjectNode o = createSchemaNode("array", true);
JavaType contentType = _elementType;
if (contentType != null) {
JsonNode schemaNode = null;
// 15-Oct-2010, tatu: We can't serialize plain Object.class; but what should it produce here? Untyped?
if (contentType.getRawClass() != Object.class) {
JsonSerializer ser = provider.findValueSerializer(contentType, _property);
if (ser instanceof SchemaAware) {
schemaNode = ((SchemaAware) ser).getSchema(provider, null);
}
}
if (schemaNode == null) {
schemaNode = com.fasterxml.jackson.databind.jsonschema.JsonSchema.getDefaultSchemaNode();
}
o.set("items", schemaNode);
}
return o;
}
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
throws JsonMappingException
{
JsonSerializer valueSer = _elementSerializer;
if (valueSer == null) {
valueSer = visitor.getProvider().findValueSerializer(_elementType, _property);
}
visitArrayFormat(visitor, typeHint, valueSer, _elementType);
}
protected final JsonSerializer _findAndAddDynamic(PropertySerializerMap map,
Class type, SerializerProvider provider) throws JsonMappingException
{
PropertySerializerMap.SerializerAndMapResult result = map.findAndAddSecondarySerializer(type, provider, _property);
// did we get a new map of serializers? If so, start using it
if (map != result.map) {
_dynamicSerializers = result.map;
}
return result.serializer;
}
protected final JsonSerializer _findAndAddDynamic(PropertySerializerMap map,
JavaType type, SerializerProvider provider) throws JsonMappingException
{
PropertySerializerMap.SerializerAndMapResult result = map.findAndAddSecondarySerializer(type, provider, _property);
if (map != result.map) {
_dynamicSerializers = result.map;
}
return result.serializer;
}
}
