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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.InvocationTargetException;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.IdentityHashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.JsonParser.NumberType;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsonFormatVisitors.*;
import com.fasterxml.jackson.databind.jsonschema.SchemaAware;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.PropertyFilter;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.Converter;
/**
* Base class used by all standard serializers, and can also
* be used for custom serializers (in fact, this is the recommended
* base class to use).
* Provides convenience methods for implementing {@link SchemaAware}
*/
public abstract class StdSerializer
extends JsonSerializer
implements JsonFormatVisitable, SchemaAware, java.io.Serializable
{
private static final long serialVersionUID = 1L;
/**
* Key used for storing a lock object to prevent infinite recursion when
* constructing converting serializers.
*
* @since 2.9
*/
private final static Object KEY_CONTENT_CONVERTER_LOCK = new Object();
/**
* Nominal type supported, usually declared type of
* property for which serializer is used.
*/
protected final Class _handledType;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
protected StdSerializer(Class t) {
_handledType = t;
}
@SuppressWarnings("unchecked")
protected StdSerializer(JavaType type) {
_handledType = (Class) type.getRawClass();
}
/**
* Alternate constructor that is (alas!) needed to work
* around kinks of generic type handling
*/
@SuppressWarnings("unchecked")
protected StdSerializer(Class t, boolean dummy) {
_handledType = (Class) t;
}
/**
* @since 2.6
*/
@SuppressWarnings("unchecked")
protected StdSerializer(StdSerializer src) {
_handledType = (Class) src._handledType;
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public Class handledType() { return _handledType; }
/*
/**********************************************************
/* Serialization
/**********************************************************
*/
@Override
public abstract void serialize(T value, JsonGenerator gen, SerializerProvider provider)
throws IOException;
/*
/**********************************************************
/* Type introspection API, partial/default implementation
/**********************************************************
*/
/**
* Default implementation specifies no format. This behavior is usually
* overriden by custom serializers.
*/
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
throws JsonMappingException
{
visitor.expectAnyFormat(typeHint);
}
/**
* Default implementation simply claims type is "string"; usually
* overriden by custom serializers.
*/
@Override
public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException
{
return createSchemaNode("string");
}
/**
* Default implementation simply claims type is "string"; usually
* overriden by custom serializers.
*/
@Override
public JsonNode getSchema(SerializerProvider provider, Type typeHint, boolean isOptional)
throws JsonMappingException
{
ObjectNode schema = (ObjectNode) getSchema(provider, typeHint);
if (!isOptional) {
schema.put("required", !isOptional);
}
return schema;
}
/*
/**********************************************************
/* Helper methods for JSON Schema generation
/**********************************************************
*/
protected ObjectNode createSchemaNode(String type)
{
ObjectNode schema = JsonNodeFactory.instance.objectNode();
schema.put("type", type);
return schema;
}
protected ObjectNode createSchemaNode(String type, boolean isOptional)
{
ObjectNode schema = createSchemaNode(type);
if (!isOptional) {
schema.put("required", !isOptional);
}
return schema;
}
/**
* Helper method that calls necessary visit method(s) to indicate that the
* underlying JSON type is JSON String.
*
* @since 2.7
*/
protected void visitStringFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint)
throws JsonMappingException {
/*JsonStringFormatVisitor v2 =*/ visitor.expectStringFormat(typeHint);
}
/**
* Helper method that calls necessary visit method(s) to indicate that the
* underlying JSON type is JSON String, but that there is a more refined
* logical type
*
* @since 2.7
*/
protected void visitStringFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
JsonValueFormat format)
throws JsonMappingException
{
JsonStringFormatVisitor v2 = visitor.expectStringFormat(typeHint);
if (v2 != null) {
v2.format(format);
}
}
/**
* Helper method that calls necessary visit method(s) to indicate that the
* underlying JSON type is JSON Integer number.
*
* @since 2.7
*/
protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
NumberType numberType)
throws JsonMappingException
{
JsonIntegerFormatVisitor v2 = visitor.expectIntegerFormat(typeHint);
if (_neitherNull(v2, numberType)) {
v2.numberType(numberType);
}
}
/**
* Helper method that calls necessary visit method(s) to indicate that the
* underlying JSON type is JSON Integer number, but that there is also a further
* format restriction involved.
*
* @since 2.7
*/
protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
NumberType numberType, JsonValueFormat format)
throws JsonMappingException
{
JsonIntegerFormatVisitor v2 = visitor.expectIntegerFormat(typeHint);
if (v2 != null) {
if (numberType != null) {
v2.numberType(numberType);
}
if (format != null) {
v2.format(format);
}
}
}
/**
* Helper method that calls necessary visit method(s) to indicate that the
* underlying JSON type is a floating-point JSON number.
*
* @since 2.7
*/
protected void visitFloatFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
NumberType numberType)
throws JsonMappingException
{
JsonNumberFormatVisitor v2 = visitor.expectNumberFormat(typeHint);
if (v2 != null) {
v2.numberType(numberType);
}
}
/**
* @since 2.7
*/
protected void visitArrayFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
JsonSerializer itemSerializer, JavaType itemType)
throws JsonMappingException
{
JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
if (_neitherNull(v2, itemSerializer)) {
v2.itemsFormat(itemSerializer, itemType);
}
}
/**
* @since 2.7
*/
protected void visitArrayFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
JsonFormatTypes itemType)
throws JsonMappingException
{
JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
if (v2 != null) {
v2.itemsFormat(itemType);
}
}
/*
/**********************************************************
/* Helper methods for exception handling
/**********************************************************
*/
/**
* Method that will modify caught exception (passed in as argument)
* as necessary to include reference information, and to ensure it
* is a subtype of {@link IOException}, or an unchecked exception.
*
* Rules for wrapping and unwrapping are bit complicated; essentially:
*
* - Errors are to be passed as is (if uncovered via unwrapping)
*
- "Plain" IOExceptions (ones that are not of type
* {@link JsonMappingException} are to be passed as is
*
*/
public void wrapAndThrow(SerializerProvider provider,
Throwable t, Object bean, String fieldName)
throws IOException
{
/* 05-Mar-2009, tatu: But one nasty edge is when we get
* StackOverflow: usually due to infinite loop. But that
* usually gets hidden within an InvocationTargetException...
*/
while (t instanceof InvocationTargetException && t.getCause() != null) {
t = t.getCause();
}
// Errors and "plain" to be passed as is
ClassUtil.throwIfError(t);
// Ditto for IOExceptions... except for mapping exceptions!
boolean wrap = (provider == null) || provider.isEnabled(SerializationFeature.WRAP_EXCEPTIONS);
if (t instanceof IOException) {
if (!wrap || !(t instanceof JsonMappingException)) {
throw (IOException) t;
}
} else if (!wrap) {
ClassUtil.throwIfRTE(t);
}
// Need to add reference information
throw JsonMappingException.wrapWithPath(t, bean, fieldName);
}
public void wrapAndThrow(SerializerProvider provider,
Throwable t, Object bean, int index)
throws IOException
{
while (t instanceof InvocationTargetException && t.getCause() != null) {
t = t.getCause();
}
// Errors are to be passed as is
ClassUtil.throwIfError(t);
// Ditto for IOExceptions... except for mapping exceptions!
boolean wrap = (provider == null) || provider.isEnabled(SerializationFeature.WRAP_EXCEPTIONS);
if (t instanceof IOException) {
if (!wrap || !(t instanceof JsonMappingException)) {
throw (IOException) t;
}
} else if (!wrap) {
ClassUtil.throwIfRTE(t);
}
// Need to add reference information
throw JsonMappingException.wrapWithPath(t, bean, index);
}
/*
/**********************************************************
/* Helper methods, accessing annotation-based configuration
/**********************************************************
*/
/**
* Helper method that can be used to see if specified property has annotation
* indicating that a converter is to be used for contained values (contents
* of structured types; array/List/Map values)
*
* @param existingSerializer (optional) configured content
* serializer if one already exists.
*
* @since 2.9
*/
protected JsonSerializer findContextualConvertingSerializer(SerializerProvider provider,
BeanProperty property, JsonSerializer existingSerializer)
throws JsonMappingException
{
// 08-Dec-2016, tatu: to fix [databind#357], need to prevent recursive calls for
// same property
@SuppressWarnings("unchecked")
Map conversions = (Map) provider.getAttribute(KEY_CONTENT_CONVERTER_LOCK);
if (conversions != null) {
Object lock = conversions.get(property);
if (lock != null) {
return existingSerializer;
}
} else {
conversions = new IdentityHashMap<>();
provider.setAttribute(KEY_CONTENT_CONVERTER_LOCK, conversions);
}
conversions.put(property, Boolean.TRUE);
try {
JsonSerializer ser = findConvertingContentSerializer(provider, property, existingSerializer);
if (ser != null) {
return provider.handleSecondaryContextualization(ser, property);
}
} finally {
conversions.remove(property);
}
return existingSerializer;
}
/**
* @deprecated Since 2.9 use {link {@link #findContextualConvertingSerializer} instead
*/
@Deprecated
protected JsonSerializer findConvertingContentSerializer(SerializerProvider provider,
BeanProperty prop, JsonSerializer existingSerializer)
throws JsonMappingException
{
final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
if (_neitherNull(intr, prop)) {
AnnotatedMember m = prop.getMember();
if (m != null) {
Object convDef = intr.findSerializationContentConverter(m);
if (convDef != null) {
Converter conv = provider.converterInstance(prop.getMember(), convDef);
JavaType delegateType = conv.getOutputType(provider.getTypeFactory());
// [databind#731]: Should skip if nominally java.lang.Object
if ((existingSerializer == null) && !delegateType.isJavaLangObject()) {
existingSerializer = provider.findValueSerializer(delegateType);
}
return new StdDelegatingSerializer(conv, delegateType, existingSerializer);
}
}
}
return existingSerializer;
}
/**
* Helper method used to locate filter that is needed, based on filter id
* this serializer was constructed with.
*
* @since 2.3
*/
protected PropertyFilter findPropertyFilter(SerializerProvider provider,
Object filterId, Object valueToFilter)
throws JsonMappingException
{
FilterProvider filters = provider.getFilterProvider();
// Not ok to miss the provider, if a filter is declared to be needed.
if (filters == null) {
provider.reportBadDefinition(handledType(),
"Cannot resolve PropertyFilter with id '"+filterId+"'; no FilterProvider configured");
}
// But whether unknown ids are ok just depends on filter provider; if we get null that's fine
return filters.findPropertyFilter(filterId, valueToFilter);
}
/**
* Helper method that may be used to find if this deserializer has specific
* {@link JsonFormat} settings, either via property, or through type-specific
* defaulting.
*
* @param typeForDefaults Type (erased) used for finding default format settings, if any
*
* @since 2.7
*/
protected JsonFormat.Value findFormatOverrides(SerializerProvider provider,
BeanProperty prop, Class typeForDefaults)
{
if (prop != null) {
return prop.findPropertyFormat(provider.getConfig(), typeForDefaults);
}
// even without property or AnnotationIntrospector, may have type-specific defaults
return provider.getDefaultPropertyFormat(typeForDefaults);
}
/**
* Convenience method that uses {@link #findFormatOverrides} to find possible
* defaults and/of overrides, and then calls JsonFormat.Value.getFeature(...)
* to find whether that feature has been specifically marked as enabled or disabled.
*
* @param typeForDefaults Type (erased) used for finding default format settings, if any
*
* @since 2.7
*/
protected Boolean findFormatFeature(SerializerProvider provider,
BeanProperty prop, Class typeForDefaults, JsonFormat.Feature feat)
{
JsonFormat.Value format = findFormatOverrides(provider, prop, typeForDefaults);
if (format != null) {
return format.getFeature(feat);
}
return null;
}
/**
* @since 2.8
*/
protected JsonInclude.Value findIncludeOverrides(SerializerProvider provider,
BeanProperty prop, Class typeForDefaults)
{
if (prop != null) {
return prop.findPropertyInclusion(provider.getConfig(), typeForDefaults);
}
// even without property or AnnotationIntrospector, may have type-specific defaults
return provider.getDefaultPropertyInclusion(typeForDefaults);
}
/**
* Convenience method for finding out possibly configured content value serializer.
*
* @since 2.7.4
*/
protected JsonSerializer findAnnotatedContentSerializer(SerializerProvider serializers,
BeanProperty property)
throws JsonMappingException
{
if (property != null) {
// First: if we have a property, may have property-annotation overrides
AnnotatedMember m = property.getMember();
final AnnotationIntrospector intr = serializers.getAnnotationIntrospector();
if (m != null) {
Object serDef = intr.findContentSerializer(m);
if (serDef != null) {
return serializers.serializerInstance(m, serDef);
}
}
}
return null;
}
/*
/**********************************************************
/* Helper methods, other
/**********************************************************
*/
/**
* Method that can be called to determine if given serializer is the default
* serializer Jackson uses; as opposed to a custom serializer installed by
* a module or calling application. Determination is done using
* {@link JacksonStdImpl} annotation on serializer class.
*/
protected boolean isDefaultSerializer(JsonSerializer serializer) {
return ClassUtil.isJacksonStdImpl(serializer);
}
/**
* @since 2.9
*/
protected final static boolean _neitherNull(Object a, Object b) {
return (a != null) && (b != null);
}
/**
* @since 2.9
*/
protected final static boolean _nonEmpty(Collection c) {
return (c != null) && !c.isEmpty();
}
}