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com.fasterxml.jackson.databind.ObjectWriter Maven / Gradle / Ivy
General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind;
import java.io.*;
import java.text.DateFormat;
import java.util.Locale;
import java.util.TimeZone;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.io.SegmentedStringWriter;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.core.util.ByteArrayBuilder;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.core.util.Instantiatable;
import com.fasterxml.jackson.core.util.MinimalPrettyPrinter;
import com.fasterxml.jackson.databind.cfg.DatabindVersion;
import com.fasterxml.jackson.databind.ser.DefaultSerializerProvider;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.SerializerFactory;
import com.fasterxml.jackson.databind.type.TypeFactory;
/**
* Builder object that can be used for per-serialization configuration of
* serialization parameters, such as JSON View and root type to use.
* (and thus fully thread-safe with no external synchronization);
* new instances are constructed for different configurations.
* Instances are initially constructed by {@link ObjectMapper} and can be
* reused in completely thread-safe manner with no explicit synchronization
*/
public class ObjectWriter
implements Versioned,
java.io.Serializable // since 2.1
{
private static final long serialVersionUID = -7024829992408267532L;
/**
* We need to keep track of explicit disabling of pretty printing;
* easiest to do by a token value.
*/
protected final static PrettyPrinter NULL_PRETTY_PRINTER = new MinimalPrettyPrinter();
/*
/**********************************************************
/* Immutable configuration from ObjectMapper
/**********************************************************
*/
/**
* General serialization configuration settings
*/
protected final SerializationConfig _config;
protected final DefaultSerializerProvider _serializerProvider;
protected final SerializerFactory _serializerFactory;
/**
* Factory used for constructing {@link JsonGenerator}s
*/
protected final JsonFactory _jsonFactory;
/*
/**********************************************************
/* Configuration that can be changed during building
/**********************************************************
*/
/**
* Specified root serialization type to use; can be same
* as runtime type, but usually one of its super types
*/
protected final JavaType _rootType;
/**
* We may pre-fetch serializer if {@link #_rootType}
* is known, and if so, reuse it afterwards.
* This allows avoiding further serializer lookups and increases
* performance a bit on cases where readers are reused.
*
* @since 2.1
*/
protected final JsonSerializer _rootSerializer;
/**
* To allow for dynamic enabling/disabling of pretty printing,
* pretty printer can be optionally configured for writer
* as well
*/
protected final PrettyPrinter _prettyPrinter;
/**
* When using data format that uses a schema, schema is passed
* to generator.
*/
protected final FormatSchema _schema;
/*
/**********************************************************
/* Life-cycle, constructors
/**********************************************************
*/
/**
* Constructor used by {@link ObjectMapper} for initial instantiation
*/
protected ObjectWriter(ObjectMapper mapper, SerializationConfig config,
JavaType rootType, PrettyPrinter pp)
{
_config = config;
_serializerProvider = mapper._serializerProvider;
_serializerFactory = mapper._serializerFactory;
_jsonFactory = mapper._jsonFactory;
_rootType = rootType;
_prettyPrinter = pp;
_schema = null;
_rootSerializer = _prefetchRootSerializer(config, rootType);
}
/**
* Alternative constructor for initial instantiation by {@link ObjectMapper}
*/
protected ObjectWriter(ObjectMapper mapper, SerializationConfig config)
{
_config = config;
_serializerProvider = mapper._serializerProvider;
_serializerFactory = mapper._serializerFactory;
_jsonFactory = mapper._jsonFactory;
_rootType = null;
_rootSerializer = null;
_prettyPrinter = null;
_schema = null;
}
/**
* Alternative constructor for initial instantiation by {@link ObjectMapper}
*/
protected ObjectWriter(ObjectMapper mapper, SerializationConfig config,
FormatSchema s)
{
_config = config;
_serializerProvider = mapper._serializerProvider;
_serializerFactory = mapper._serializerFactory;
_jsonFactory = mapper._jsonFactory;
_rootType = null;
_rootSerializer = null;
_prettyPrinter = null;
_schema = s;
}
/**
* Copy constructor used for building variations.
*/
protected ObjectWriter(ObjectWriter base, SerializationConfig config,
JavaType rootType, JsonSerializer rootSer,
PrettyPrinter pp, FormatSchema s)
{
_config = config;
_serializerProvider = base._serializerProvider;
_serializerFactory = base._serializerFactory;
_jsonFactory = base._jsonFactory;
_rootType = rootType;
_rootSerializer = rootSer;
_prettyPrinter = pp;
_schema = s;
}
/**
* Copy constructor used for building variations.
*/
protected ObjectWriter(ObjectWriter base, SerializationConfig config)
{
_config = config;
_serializerProvider = base._serializerProvider;
_serializerFactory = base._serializerFactory;
_jsonFactory = base._jsonFactory;
_schema = base._schema;
_rootType = base._rootType;
_rootSerializer = base._rootSerializer;
_prettyPrinter = base._prettyPrinter;
}
/**
* Method that will return version information stored in and read from jar
* that contains this class.
*/
// @Override
public Version version() {
return DatabindVersion.instance.version();
}
/*
/**********************************************************
/* Life-cycle, fluent factories
/**********************************************************
*/
/**
* Method for constructing a new instance that is configured
* with specified feature enabled.
*/
public ObjectWriter with(SerializationFeature feature)
{
SerializationConfig newConfig = _config.with(feature);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter with(SerializationFeature first,
SerializationFeature... other)
{
SerializationConfig newConfig = _config.with(first, other);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter withFeatures(SerializationFeature... features)
{
SerializationConfig newConfig = _config.withFeatures(features);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method for constructing a new instance that is configured
* with specified feature enabled.
*/
public ObjectWriter without(SerializationFeature feature)
{
SerializationConfig newConfig = _config.without(feature);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter without(SerializationFeature first,
SerializationFeature... other)
{
SerializationConfig newConfig = _config.without(first, other);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter withoutFeatures(SerializationFeature... features)
{
SerializationConfig newConfig = _config.withoutFeatures(features);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Fluent factory method that will construct a new writer instance that will
* use specified date format for serializing dates; or if null passed, one
* that will serialize dates as numeric timestamps.
*
* Note that the method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter with(DateFormat df)
{
SerializationConfig newConfig = _config.with(df);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method that will construct a new instance that will use the default
* pretty printer for serialization.
*/
public ObjectWriter withDefaultPrettyPrinter()
{
return with(new DefaultPrettyPrinter());
}
/**
* Method that will construct a new instance that uses specified
* provider for resolving filter instances by id.
*/
public ObjectWriter with(FilterProvider filterProvider)
{
if (filterProvider == _config.getFilterProvider()) { // no change?
return this;
}
return new ObjectWriter(this, _config.withFilters(filterProvider));
}
/**
* Method that will construct a new instance that will use specified pretty
* printer (or, if null, will not do any pretty-printing)
*/
public ObjectWriter with(PrettyPrinter pp)
{
if (pp == _prettyPrinter) {
return this;
}
// since null would mean "don't care", need to use placeholder to indicate "disable"
if (pp == null) {
pp = NULL_PRETTY_PRINTER;
}
return new ObjectWriter(this, _config, _rootType, _rootSerializer, pp, _schema);
}
/**
* Method for constructing a new instance with configuration that
* specifies what root name to use for "root element wrapping".
* See {@link SerializationConfig#withRootName(String)} for details.
*
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter withRootName(String rootName)
{
SerializationConfig newConfig = _config.withRootName(rootName);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method that will construct a new instance that uses specific format schema
* for serialization.
*
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter withSchema(FormatSchema schema)
{
return (_schema == schema) ? this :
new ObjectWriter(this, _config, _rootType, _rootSerializer, _prettyPrinter, schema);
}
/**
* Method that will construct a new instance that uses specific type
* as the root type for serialization, instead of runtime dynamic
* type of the root object itself.
*
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter withType(JavaType rootType)
{
JsonSerializer rootSer = _prefetchRootSerializer(_config, rootType);
return (rootType == _rootType) ? this
// type is stored here, no need to make a copy of config
: new ObjectWriter(this, _config, rootType, rootSer, _prettyPrinter, _schema);
}
/**
* Method that will construct a new instance that uses specific type
* as the root type for serialization, instead of runtime dynamic
* type of the root object itself.
*/
public ObjectWriter withType(Class rootType) {
return withType(_config.constructType(rootType));
}
public ObjectWriter withType(TypeReference rootType) {
return withType(_config.getTypeFactory().constructType(rootType.getType()));
}
/**
* Method that will construct a new instance that uses specified
* serialization view for serialization (with null basically disables
* view processing)
*
* Note that the method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter withView(Class view) {
SerializationConfig newConfig = _config.withView(view);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
public ObjectWriter with(Locale l) {
SerializationConfig newConfig = _config.with(l);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
public ObjectWriter with(TimeZone tz) {
SerializationConfig newConfig = _config.with(tz);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/**
* Method that will construct a new instance that uses specified default
* {@link Base64Variant} for base64 encoding
*
* @since 2.1
*/
public ObjectWriter with(Base64Variant b64variant) {
SerializationConfig newConfig = _config.with(b64variant);
return (newConfig == _config) ? this : new ObjectWriter(this, newConfig);
}
/*
/**********************************************************
/* Simple accessors
/**********************************************************
*/
public boolean isEnabled(SerializationFeature f) {
return _config.isEnabled(f);
}
public boolean isEnabled(MapperFeature f) {
return _config.isEnabled(f);
}
public boolean isEnabled(JsonParser.Feature f) {
return _jsonFactory.isEnabled(f);
}
public JsonFactory getJsonFactory() {
return _jsonFactory;
}
public TypeFactory getTypeFactory() {
return _config.getTypeFactory();
}
/*
/**********************************************************
/* Serialization methods; ones from ObjectCodec first
/**********************************************************
*/
/**
* Method that can be used to serialize any Java value as
* JSON output, using provided {@link JsonGenerator}.
*/
public void writeValue(JsonGenerator jgen, Object value)
throws IOException, JsonGenerationException, JsonMappingException
{
// 10-Aug-2012, tatu: As per [Issue#12], may need to force PrettyPrinter settings, so:
_configureJsonGenerator(jgen);
if (_config.isEnabled(SerializationFeature.CLOSE_CLOSEABLE)
&& (value instanceof Closeable)) {
_writeCloseableValue(jgen, value, _config);
} else {
if (_rootType == null) {
_serializerProvider(_config).serializeValue(jgen, value);
} else {
_serializerProvider(_config).serializeValue(jgen, value, _rootType, _rootSerializer);
}
if (_config.isEnabled(SerializationFeature.FLUSH_AFTER_WRITE_VALUE)) {
jgen.flush();
}
}
}
/*
/**********************************************************
/* Serialization methods, others
/**********************************************************
*/
/**
* Method that can be used to serialize any Java value as
* JSON output, written to File provided.
*/
public void writeValue(File resultFile, Object value)
throws IOException, JsonGenerationException, JsonMappingException
{
_configAndWriteValue(_jsonFactory.createJsonGenerator(resultFile, JsonEncoding.UTF8), value);
}
/**
* Method that can be used to serialize any Java value as
* JSON output, using output stream provided (using encoding
* {@link JsonEncoding#UTF8}).
*
* Note: method does not close the underlying stream explicitly
* here; however, {@link JsonFactory} this mapper uses may choose
* to close the stream depending on its settings (by default,
* it will try to close it when {@link JsonGenerator} we construct
* is closed).
*/
public void writeValue(OutputStream out, Object value)
throws IOException, JsonGenerationException, JsonMappingException
{
_configAndWriteValue(_jsonFactory.createJsonGenerator(out, JsonEncoding.UTF8), value);
}
/**
* Method that can be used to serialize any Java value as
* JSON output, using Writer provided.
*
* Note: method does not close the underlying stream explicitly
* here; however, {@link JsonFactory} this mapper uses may choose
* to close the stream depending on its settings (by default,
* it will try to close it when {@link JsonGenerator} we construct
* is closed).
*/
public void writeValue(Writer w, Object value)
throws IOException, JsonGenerationException, JsonMappingException
{
_configAndWriteValue(_jsonFactory.createJsonGenerator(w), value);
}
/**
* Method that can be used to serialize any Java value as
* a String. Functionally equivalent to calling
* {@link #writeValue(Writer,Object)} with {@link java.io.StringWriter}
* and constructing String, but more efficient.
*
* Note: prior to version 2.1, throws clause included {@link IOException}; 2.1 removed it.
*/
public String writeValueAsString(Object value)
throws JsonProcessingException
{
// alas, we have to pull the recycler directly here...
SegmentedStringWriter sw = new SegmentedStringWriter(_jsonFactory._getBufferRecycler());
try {
_configAndWriteValue(_jsonFactory.createJsonGenerator(sw), value);
} catch (JsonProcessingException e) { // to support [JACKSON-758]
throw e;
} catch (IOException e) { // shouldn't really happen, but is declared as possibility so:
throw JsonMappingException.fromUnexpectedIOE(e);
}
return sw.getAndClear();
}
/**
* Method that can be used to serialize any Java value as
* a byte array. Functionally equivalent to calling
* {@link #writeValue(Writer,Object)} with {@link java.io.ByteArrayOutputStream}
* and getting bytes, but more efficient.
* Encoding used will be UTF-8.
*
* Note: prior to version 2.1, throws clause included {@link IOException}; 2.1 removed it.
*/
public byte[] writeValueAsBytes(Object value)
throws JsonProcessingException
{
ByteArrayBuilder bb = new ByteArrayBuilder(_jsonFactory._getBufferRecycler());
try {
_configAndWriteValue(_jsonFactory.createJsonGenerator(bb, JsonEncoding.UTF8), value);
} catch (JsonProcessingException e) { // to support [JACKSON-758]
throw e;
} catch (IOException e) { // shouldn't really happen, but is declared as possibility so:
throw JsonMappingException.fromUnexpectedIOE(e);
}
byte[] result = bb.toByteArray();
bb.release();
return result;
}
/*
/**********************************************************
/* Other public methods
/**********************************************************
*/
public boolean canSerialize(Class type) {
return _serializerProvider(_config).hasSerializerFor(type);
}
/*
/**********************************************************
/* Overridable helper methods
/**********************************************************
*/
/**
* Overridable helper method used for constructing
* {@link SerializerProvider} to use for serialization.
*/
protected DefaultSerializerProvider _serializerProvider(SerializationConfig config) {
return _serializerProvider.createInstance(config, _serializerFactory);
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
/**
* Method called to configure the generator as necessary and then
* call write functionality
*/
protected final void _configAndWriteValue(JsonGenerator jgen, Object value)
throws IOException, JsonGenerationException, JsonMappingException
{
_configureJsonGenerator(jgen);
// [JACKSON-282]: consider Closeable
if (_config.isEnabled(SerializationFeature.CLOSE_CLOSEABLE) && (value instanceof Closeable)) {
_writeCloseable(jgen, value, _config);
return;
}
boolean closed = false;
try {
if (_rootType == null) {
_serializerProvider(_config).serializeValue(jgen, value);
} else {
_serializerProvider(_config).serializeValue(jgen, value, _rootType, _rootSerializer);
}
closed = true;
jgen.close();
} finally {
/* won't try to close twice; also, must catch exception (so it
* will not mask exception that is pending)
*/
if (!closed) {
try {
jgen.close();
} catch (IOException ioe) { }
}
}
}
/**
* Helper method used when value to serialize is {@link Closeable} and its close()
* method is to be called right after serialization has been called
*/
private final void _writeCloseable(JsonGenerator jgen, Object value, SerializationConfig cfg)
throws IOException, JsonGenerationException, JsonMappingException
{
Closeable toClose = (Closeable) value;
try {
if (_rootType == null) {
_serializerProvider(cfg).serializeValue(jgen, value);
} else {
_serializerProvider(cfg).serializeValue(jgen, value, _rootType, _rootSerializer);
}
JsonGenerator tmpJgen = jgen;
jgen = null;
tmpJgen.close();
Closeable tmpToClose = toClose;
toClose = null;
tmpToClose.close();
} finally {
/* Need to close both generator and value, as long as they haven't yet
* been closed
*/
if (jgen != null) {
try {
jgen.close();
} catch (IOException ioe) { }
}
if (toClose != null) {
try {
toClose.close();
} catch (IOException ioe) { }
}
}
}
/**
* Helper method used when value to serialize is {@link Closeable} and its close()
* method is to be called right after serialization has been called
*/
private final void _writeCloseableValue(JsonGenerator jgen, Object value, SerializationConfig cfg)
throws IOException, JsonGenerationException, JsonMappingException
{
Closeable toClose = (Closeable) value;
try {
if (_rootType == null) {
_serializerProvider(cfg).serializeValue(jgen, value);
} else {
_serializerProvider(cfg).serializeValue(jgen, value, _rootType, _rootSerializer);
}
if (_config.isEnabled(SerializationFeature.FLUSH_AFTER_WRITE_VALUE)) {
jgen.flush();
}
Closeable tmpToClose = toClose;
toClose = null;
tmpToClose.close();
} finally {
if (toClose != null) {
try {
toClose.close();
} catch (IOException ioe) { }
}
}
}
/**
* Method called to locate (root) serializer ahead of time, if permitted
* by configuration. Method also is NOT to throw an exception if
* access fails.
*/
protected final JsonSerializer _prefetchRootSerializer(
SerializationConfig config, JavaType valueType)
{
if (valueType == null || !_config.isEnabled(SerializationFeature.EAGER_SERIALIZER_FETCH)) {
return null;
}
try {
return _serializerProvider(config).findTypedValueSerializer(valueType, true, null);
} catch (JsonProcessingException e) {
// need to swallow?
return null;
}
}
/**
* Helper method called to set or override settings of passed-in
* {@link JsonGenerator}
*
* @since 2.1
*/
private final void _configureJsonGenerator(JsonGenerator jgen)
{
if (_prettyPrinter != null) {
PrettyPrinter pp = _prettyPrinter;
if (pp == NULL_PRETTY_PRINTER) {
jgen.setPrettyPrinter(null);
} else {
/* [JACKSON-851]: Better take care of stateful PrettyPrinters...
* like the DefaultPrettyPrinter.
*/
if (pp instanceof Instantiatable) {
pp = (PrettyPrinter) ((Instantiatable) pp).createInstance();
}
jgen.setPrettyPrinter(pp);
}
} else if (_config.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
jgen.useDefaultPrettyPrinter();
}
// [JACKSON-520]: add support for pass-through schema:
if (_schema != null) {
jgen.setSchema(_schema);
}
}
}
