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com.fasterxml.jackson.databind.ser.impl.MapEntrySerializer Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.ser.impl;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContainerSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
/**
* @since 2.5
*/
@SuppressWarnings("serial")
@JacksonStdImpl
public class MapEntrySerializer
extends ContainerSerializer>
implements ContextualSerializer
{
/**
* Map-valued property being serialized with this instance
*/
protected final BeanProperty _property;
/**
* Whether static types should be used for serialization of values
* or not (if not, dynamic runtime type is used)
*/
protected final boolean _valueTypeIsStatic;
protected final JavaType _entryType, _keyType, _valueType;
/**
* Key serializer to use, if it can be statically determined
*/
protected JsonSerializer _keySerializer;
/**
* Value serializer to use, if it can be statically determined
*/
protected JsonSerializer _valueSerializer;
/**
* Type identifier serializer used for values, if any.
*/
protected final TypeSerializer _valueTypeSerializer;
/**
* If value type can not be statically determined, mapping from
* runtime value types to serializers are stored in this object.
*/
protected PropertySerializerMap _dynamicValueSerializers;
/*
/**********************************************************
/* Construction, initialization
/**********************************************************
*/
public MapEntrySerializer(JavaType type, JavaType keyType, JavaType valueType,
boolean staticTyping, TypeSerializer vts,
BeanProperty property)
{
super(type);
_entryType = type;
_keyType = keyType;
_valueType = valueType;
_valueTypeIsStatic = staticTyping;
_valueTypeSerializer = vts;
_property = property;
_dynamicValueSerializers = PropertySerializerMap.emptyForProperties();
}
@SuppressWarnings("unchecked")
protected MapEntrySerializer(MapEntrySerializer src, BeanProperty property,
TypeSerializer vts,
JsonSerializer keySer, JsonSerializer valueSer)
{
super(Map.class, false);
_entryType = src._entryType;
_keyType = src._keyType;
_valueType = src._valueType;
_valueTypeIsStatic = src._valueTypeIsStatic;
_valueTypeSerializer = src._valueTypeSerializer;
_keySerializer = (JsonSerializer) keySer;
_valueSerializer = (JsonSerializer) valueSer;
_dynamicValueSerializers = src._dynamicValueSerializers;
_property = src._property;
}
@Override
public ContainerSerializer _withValueTypeSerializer(TypeSerializer vts) {
return new MapEntrySerializer(this, _property, vts, _keySerializer, _valueSerializer);
}
public MapEntrySerializer withResolved(BeanProperty property,
JsonSerializer keySerializer, JsonSerializer valueSerializer) {
return new MapEntrySerializer(this, property, _valueTypeSerializer, keySerializer, valueSerializer);
}
@Override
public JsonSerializer createContextual(SerializerProvider provider,
BeanProperty property) throws JsonMappingException
{
JsonSerializer ser = null;
JsonSerializer keySer = null;
final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
final AnnotatedMember propertyAcc = (property == null) ? null : property.getMember();
// First: if we have a property, may have property-annotation overrides
if (propertyAcc != null && intr != null) {
Object serDef = intr.findKeySerializer(propertyAcc);
if (serDef != null) {
keySer = provider.serializerInstance(propertyAcc, serDef);
}
serDef = intr.findContentSerializer(propertyAcc);
if (serDef != null) {
ser = provider.serializerInstance(propertyAcc, serDef);
}
}
if (ser == null) {
ser = _valueSerializer;
}
// [Issue#124]: 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.
// 20-Aug-2013, tatu: Need to avoid trying to access serializer for java.lang.Object tho
if ((_valueTypeIsStatic && _valueType.getRawClass() != Object.class)
|| hasContentTypeAnnotation(provider, property)) {
ser = provider.findValueSerializer(_valueType, property);
}
} else {
ser = provider.handleSecondaryContextualization(ser, property);
}
if (keySer == null) {
keySer = _keySerializer;
}
if (keySer == null) {
keySer = provider.findKeySerializer(_keyType, property);
} else {
keySer = provider.handleSecondaryContextualization(keySer, property);
}
MapEntrySerializer mser = withResolved(property, keySer, ser);
// but note: no filtering, ignored entries or sorting (unlike Maps)
return mser;
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _valueType;
}
@Override
public JsonSerializer getContentSerializer() {
return _valueSerializer;
}
@Override
public boolean hasSingleElement(Map.Entry value) {
return true;
}
@Override
public boolean isEmpty(SerializerProvider prov, Entry value) {
return (value == null);
}
/*
/**********************************************************
/* Serialization methods
/**********************************************************
*/
@Override
public void serialize(Map.Entry value, JsonGenerator gen, SerializerProvider provider)
throws IOException
{
gen.writeStartObject();
// [databind#631]: Assign current value, to be accessible by custom serializers
gen.setCurrentValue(value);
if (_valueSerializer != null) {
serializeUsing(value, gen, provider, _valueSerializer);
} else {
serializeDynamic(value, gen, provider);
}
gen.writeEndObject();
}
@Override
public void serializeWithType(Map.Entry value, JsonGenerator gen, SerializerProvider provider,
TypeSerializer typeSer) throws IOException
{
typeSer.writeTypePrefixForObject(value, gen);
// [databind#631]: Assign current value, to be accessible by custom serializers
gen.setCurrentValue(value);
if (_valueSerializer != null) {
serializeUsing(value, gen, provider, _valueSerializer);
} else {
serializeDynamic(value, gen, provider);
}
typeSer.writeTypeSuffixForObject(value, gen);
}
protected void serializeDynamic(Map.Entry value, JsonGenerator jgen, SerializerProvider provider)
throws IOException
{
final JsonSerializer keySerializer = _keySerializer;
final boolean skipNulls = !provider.isEnabled(SerializationFeature.WRITE_NULL_MAP_VALUES);
final TypeSerializer vts = _valueTypeSerializer;
PropertySerializerMap serializers = _dynamicValueSerializers;
Object valueElem = value.getValue();
Object keyElem = value.getKey();
if (keyElem == null) {
provider.findNullKeySerializer(_keyType, _property).serialize(null, jgen, provider);
} else {
// [JACKSON-314] skip entries with null values?
if (skipNulls && valueElem == null) return;
keySerializer.serialize(keyElem, jgen, provider);
}
// And then value
if (valueElem == null) {
provider.defaultSerializeNull(jgen);
} else {
Class cc = valueElem.getClass();
JsonSerializer ser = serializers.serializerFor(cc);
if (ser == null) {
if (_valueType.hasGenericTypes()) {
ser = _findAndAddDynamic(serializers,
provider.constructSpecializedType(_valueType, cc), provider);
} else {
ser = _findAndAddDynamic(serializers, cc, provider);
}
serializers = _dynamicValueSerializers;
}
try {
if (vts == null) {
ser.serialize(valueElem, jgen, provider);
} else {
ser.serializeWithType(valueElem, jgen, provider, vts);
}
} catch (Exception e) {
// [JACKSON-55] Need to add reference information
String keyDesc = ""+keyElem;
wrapAndThrow(provider, e, value, keyDesc);
}
}
}
/**
* Method called to serialize fields, when the value type is statically known,
* so that value serializer is passed and does not need to be fetched from
* provider.
*/
protected void serializeUsing(Map.Entry value, JsonGenerator jgen, SerializerProvider provider,
JsonSerializer ser)
throws IOException, JsonGenerationException
{
final JsonSerializer keySerializer = _keySerializer;
final TypeSerializer vts = _valueTypeSerializer;
final boolean skipNulls = !provider.isEnabled(SerializationFeature.WRITE_NULL_MAP_VALUES);
Object valueElem = value.getValue();
Object keyElem = value.getKey();
if (keyElem == null) {
provider.findNullKeySerializer(_keyType, _property).serialize(null, jgen, provider);
} else {
// [JACKSON-314] also may need to skip entries with null values
if (skipNulls && valueElem == null) return;
keySerializer.serialize(keyElem, jgen, provider);
}
if (valueElem == null) {
provider.defaultSerializeNull(jgen);
} else {
try {
if (vts == null) {
ser.serialize(valueElem, jgen, provider);
} else {
ser.serializeWithType(valueElem, jgen, provider, vts);
}
} catch (Exception e) {
// [JACKSON-55] Need to add reference information
String keyDesc = ""+keyElem;
wrapAndThrow(provider, e, value, keyDesc);
}
}
}
/*
/**********************************************************
/* Internal helper methods
/**********************************************************
*/
protected final JsonSerializer _findAndAddDynamic(PropertySerializerMap map,
Class type, SerializerProvider provider) throws JsonMappingException
{
PropertySerializerMap.SerializerAndMapResult result = map.findAndAddSecondarySerializer(type, provider, _property);
if (map != result.map) {
_dynamicValueSerializers = 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) {
_dynamicValueSerializers = result.map;
}
return result.serializer;
}
}
