package com.fasterxml.jackson.databind.ser.std;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitable;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
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<T>
extends JsonSerializer<T>
implements JsonFormatVisitable, SchemaAware
{
/**
* Nominal type supported, usually declared type of
* property for which serializer is used.
*/
protected final Class<T> _handledType;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
protected StdSerializer(Class<T> t) {
_handledType = t;
}
@SuppressWarnings("unchecked")
protected StdSerializer(JavaType type) {
_handledType = (Class<T>) 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>) t;
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public Class<T> handledType() { return _handledType; }
/*
/**********************************************************
/* Serialization
/**********************************************************
*/
@Override
public abstract void serialize(T value, JsonGenerator jgen, SerializerProvider provider)
throws IOException, JsonGenerationException;
/*
/**********************************************************
/* Helper methods for JSON Schema generation
/**********************************************************
*/
/**
* 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;
}
protected ObjectNode createObjectNode() {
return JsonNodeFactory.instance.objectNode();
}
protected ObjectNode createSchemaNode(String type)
{
ObjectNode schema = createObjectNode();
schema.put("type", type);
return schema;
}
protected ObjectNode createSchemaNode(String type, boolean isOptional)
{
ObjectNode schema = createSchemaNode(type);
// as per [JACKSON-563]. Note that 'required' defaults to false
if (!isOptional) {
schema.put("required", !isOptional);
}
return schema;
}
/**
* 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);
}
/*
/**********************************************************
/* 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.
*<p>
* Rules for wrapping and unwrapping are bit complicated; essentially:
*<ul>
* <li>Errors are to be passed as is (if uncovered via unwrapping)
* <li>"Plain" IOExceptions (ones that are not of type
* {@link JsonMappingException} are to be passed as is
*</ul>
*/
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" IOExceptions to be passed as is
if (t instanceof Error) {
throw (Error) 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) { // [JACKSON-407] -- allow disabling wrapping for unchecked exceptions
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
}
// [JACKSON-55] 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
if (t instanceof Error) {
throw (Error) 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) { // [JACKSON-407] -- allow disabling wrapping for unchecked exceptions
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
}
// [JACKSON-55] Need to add reference information
throw JsonMappingException.wrapWithPath(t, bean, index);
}
/*
/**********************************************************
/* 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);
}
/**
* 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 2.2
*/
protected JsonSerializer<?> findConvertingContentSerializer(SerializerProvider provider,
BeanProperty prop, JsonSerializer<?> existingSerializer)
throws JsonMappingException
{
/* 19-Oct-2014, tatu: As per [databind#357], need to avoid infinite loop
* when applying contextual content converter; this is not ideal way,
* but should work for most cases.
*/
final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
if (intr != null && prop != null) {
Object convDef = intr.findSerializationContentConverter(prop.getMember());
if (convDef != null) {
Converter<Object,Object> conv = provider.converterInstance(prop.getMember(), convDef);
JavaType delegateType = conv.getOutputType(provider.getTypeFactory());
if (existingSerializer == null) {
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) {
throw new JsonMappingException("Can not resolve PropertyFilter with id '"+filterId+"'; no FilterProvider configured");
}
PropertyFilter filter = filters.findPropertyFilter(filterId, valueToFilter);
// But whether unknown ids are ok just depends on filter provider; if we get null that's fine
return filter;
}
}