ObjectWriter.java
package com.fasterxml.jackson.databind;
import java.io.*;
import java.text.*;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.concurrent.atomic.AtomicReference;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.exc.StreamWriteException;
import com.fasterxml.jackson.core.io.CharacterEscapes;
import com.fasterxml.jackson.core.io.SegmentedStringWriter;
import com.fasterxml.jackson.core.io.SerializedString;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.core.util.*;
import com.fasterxml.jackson.databind.cfg.ContextAttributes;
import com.fasterxml.jackson.databind.cfg.DatatypeFeature;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.*;
import com.fasterxml.jackson.databind.ser.impl.TypeWrappedSerializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.databind.util.ClassUtil;
/**
* 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 = 1; // since 2.5
/**
* 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 _generatorFactory;
/*
/**********************************************************
/* Configuration that can be changed via mutant factories
/**********************************************************
*/
/**
* Container for settings that need to be passed to {@link JsonGenerator}
* constructed for serializing values.
*
* @since 2.5
*/
protected final GeneratorSettings _generatorSettings;
/**
* We may pre-fetch serializer if root type
* is known (has been explicitly declared), and if so, reuse it afterwards.
* This allows avoiding further serializer lookups and increases
* performance a bit on cases where readers are reused.
*
* @since 2.5
*/
protected final Prefetch _prefetch;
/*
/**********************************************************
/* 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;
_generatorFactory = mapper._jsonFactory;
_generatorSettings = (pp == null) ? GeneratorSettings.empty
: new GeneratorSettings(pp, null, null, null);
if (rootType == null) {
_prefetch = Prefetch.empty;
} else if (rootType.hasRawClass(Object.class)) {
// 15-Sep-2019, tatu: There is no "untyped serializer", but...
// as per [databind#1093] we do need `TypeSerializer`
_prefetch = Prefetch.empty.forRootType(this, rootType);
} else {
_prefetch = Prefetch.empty.forRootType(this, rootType.withStaticTyping());
}
}
/**
* Alternative constructor for initial instantiation by {@link ObjectMapper}
*/
protected ObjectWriter(ObjectMapper mapper, SerializationConfig config)
{
_config = config;
_serializerProvider = mapper._serializerProvider;
_serializerFactory = mapper._serializerFactory;
_generatorFactory = mapper._jsonFactory;
_generatorSettings = GeneratorSettings.empty;
_prefetch = Prefetch.empty;
}
/**
* Alternative constructor for initial instantiation by {@link ObjectMapper}
*/
protected ObjectWriter(ObjectMapper mapper, SerializationConfig config,
FormatSchema s)
{
_config = config;
_serializerProvider = mapper._serializerProvider;
_serializerFactory = mapper._serializerFactory;
_generatorFactory = mapper._jsonFactory;
_generatorSettings = (s == null) ? GeneratorSettings.empty
: new GeneratorSettings(null, s, null, null);
_prefetch = Prefetch.empty;
}
/**
* Copy constructor used for building variations.
*/
protected ObjectWriter(ObjectWriter base, SerializationConfig config,
GeneratorSettings genSettings, Prefetch prefetch)
{
_config = config;
_serializerProvider = base._serializerProvider;
_serializerFactory = base._serializerFactory;
_generatorFactory = base._generatorFactory;
_generatorSettings = genSettings;
_prefetch = prefetch;
}
/**
* Copy constructor used for building variations.
*/
protected ObjectWriter(ObjectWriter base, SerializationConfig config)
{
_config = config;
_serializerProvider = base._serializerProvider;
_serializerFactory = base._serializerFactory;
_generatorFactory = base._generatorFactory;
_generatorSettings = base._generatorSettings;
_prefetch = base._prefetch;
}
/**
* @since 2.3
*/
protected ObjectWriter(ObjectWriter base, JsonFactory f)
{
// may need to override ordering, based on data format capabilities
_config = base._config
.with(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, f.requiresPropertyOrdering());
_serializerProvider = base._serializerProvider;
_serializerFactory = base._serializerFactory;
_generatorFactory = f;
_generatorSettings = base._generatorSettings;
_prefetch = base._prefetch;
}
/**
* Method that will return version information stored in and read from jar
* that contains this class.
*/
@Override
public Version version() {
return com.fasterxml.jackson.databind.cfg.PackageVersion.VERSION;
}
/*
/**********************************************************************
/* Internal factory methods, for convenience
/**********************************************************************
*/
/**
* Overridable factory method called by various "withXxx()" methods
*
* @since 2.5
*/
protected ObjectWriter _new(ObjectWriter base, JsonFactory f) {
return new ObjectWriter(base, f);
}
/**
* Overridable factory method called by various "withXxx()" methods
*
* @since 2.5
*/
protected ObjectWriter _new(ObjectWriter base, SerializationConfig config) {
if (config == _config) {
return this;
}
return new ObjectWriter(base, config);
}
/**
* Overridable factory method called by various "withXxx()" methods.
* It assumes `this` as base for settings other than those directly
* passed in.
*
* @since 2.5
*/
protected ObjectWriter _new(GeneratorSettings genSettings, Prefetch prefetch) {
if ((_generatorSettings == genSettings) && (_prefetch == prefetch)) {
return this;
}
return new ObjectWriter(this, _config, genSettings, prefetch);
}
/**
* Overridable factory method called by {@link #writeValues(OutputStream)}
* method (and its various overrides), and initializes it as necessary.
*
* @since 2.5
*/
@SuppressWarnings("resource")
protected SequenceWriter _newSequenceWriter(boolean wrapInArray,
JsonGenerator gen, boolean managedInput)
throws IOException
{
return new SequenceWriter(_serializerProvider(),
_configureGenerator(gen), managedInput, _prefetch)
.init(wrapInArray);
}
/*
/**********************************************************
/* Life-cycle, fluent factories for SerializationFeature
/**********************************************************
*/
/**
* Method for constructing a new instance that is configured
* with specified feature enabled.
*/
public ObjectWriter with(SerializationFeature feature) {
return _new(this, _config.with(feature));
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter with(SerializationFeature first, SerializationFeature... other) {
return _new(this, _config.with(first, other));
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*/
public ObjectWriter withFeatures(SerializationFeature... features) {
return _new(this, _config.withFeatures(features));
}
/**
* Method for constructing a new instance that is configured
* with specified feature disabled.
*/
public ObjectWriter without(SerializationFeature feature) {
return _new(this, _config.without(feature));
}
/**
* Method for constructing a new instance that is configured
* with specified features disabled.
*/
public ObjectWriter without(SerializationFeature first, SerializationFeature... other) {
return _new(this, _config.without(first, other));
}
/**
* Method for constructing a new instance that is configured
* with specified features disabled.
*/
public ObjectWriter withoutFeatures(SerializationFeature... features) {
return _new(this, _config.withoutFeatures(features));
}
/*
/**********************************************************************
/* Life-cycle, fluent factories for DatatypeFeature (2.14+)
/**********************************************************************
*/
/**
* Method for constructing a new instance that is configured
* with specified feature enabled.
*
* @since 2.14
*/
public ObjectWriter with(DatatypeFeature feature) {
return _new(this, _config.with(feature));
}
/**
* Method for constructing a new instance that is configured
* with specified features enabled.
*
* @since 2.14
*/
public ObjectWriter withFeatures(DatatypeFeature... features) {
return _new(this, _config.withFeatures(features));
}
/**
* Method for constructing a new instance that is configured
* with specified feature disabled.
*
* @since 2.14
*/
public ObjectWriter without(DatatypeFeature feature) {
return _new(this, _config.without(feature));
}
/**
* Method for constructing a new instance that is configured
* with specified features disabled.
*
* @since 2.14
*/
public ObjectWriter withoutFeatures(DatatypeFeature... features) {
return _new(this, _config.withoutFeatures(features));
}
/*
/**********************************************************
/* Life-cycle, fluent factories for JsonGenerator.Feature (2.5)
/**********************************************************
*/
/**
* @since 2.5
*/
public ObjectWriter with(JsonGenerator.Feature feature) {
return _new(this, _config.with(feature));
}
/**
* @since 2.5
*/
public ObjectWriter withFeatures(JsonGenerator.Feature... features) {
return _new(this, _config.withFeatures(features));
}
/**
* @since 2.5
*/
public ObjectWriter without(JsonGenerator.Feature feature) {
return _new(this, _config.without(feature));
}
/**
* @since 2.5
*/
public ObjectWriter withoutFeatures(JsonGenerator.Feature... features) {
return _new(this, _config.withoutFeatures(features));
}
/*
/**********************************************************
/* Life-cycle, fluent factories for StreamWriteFeature (2.11)
/**********************************************************
*/
/**
* @since 2.11
*/
public ObjectWriter with(StreamWriteFeature feature) {
return _new(this, _config.with(feature.mappedFeature()));
}
/**
* @since 2.11
*/
public ObjectWriter without(StreamWriteFeature feature) {
return _new(this, _config.without(feature.mappedFeature()));
}
/*
/**********************************************************
/* Life-cycle, fluent factories for FormatFeature (2.7)
/**********************************************************
*/
/**
* @since 2.7
*/
public ObjectWriter with(FormatFeature feature) {
return _new(this, _config.with(feature));
}
/**
* @since 2.7
*/
public ObjectWriter withFeatures(FormatFeature... features) {
return _new(this, _config.withFeatures(features));
}
/**
* @since 2.7
*/
public ObjectWriter without(FormatFeature feature) {
return _new(this, _config.without(feature));
}
/**
* @since 2.7
*/
public ObjectWriter withoutFeatures(FormatFeature... features) {
return _new(this, _config.withoutFeatures(features));
}
/*
/**********************************************************
/* Life-cycle, fluent factories, type-related
/**********************************************************
*/
/**
* 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.
*<p>
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*
* @since 2.5
*/
public ObjectWriter forType(JavaType rootType) {
return _new(_generatorSettings, _prefetch.forRootType(this, rootType));
}
/**
* 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.
*
* @since 2.5
*/
public ObjectWriter forType(Class<?> rootType) {
return forType(_config.constructType(rootType));
}
/**
* 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.
*
* @since 2.5
*/
public ObjectWriter forType(TypeReference<?> rootType) {
return forType(_config.getTypeFactory().constructType(rootType.getType()));
}
/**
* @deprecated since 2.5 Use {@link #forType(JavaType)} instead
*/
@Deprecated // since 2.5
public ObjectWriter withType(JavaType rootType) {
return forType(rootType);
}
/**
* @deprecated since 2.5 Use {@link #forType(Class)} instead
*/
@Deprecated // since 2.5
public ObjectWriter withType(Class<?> rootType) {
return forType(rootType);
}
/**
* @deprecated since 2.5 Use {@link #forType(TypeReference)} instead
*/
@Deprecated // since 2.5
public ObjectWriter withType(TypeReference<?> rootType) {
return forType(rootType);
}
/*
/**********************************************************
/* Life-cycle, fluent factories, other
/**********************************************************
*/
/**
* 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.
*<p>
* 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) {
return _new(this, _config.with(df));
}
/**
* Method that will construct a new instance that will use the default
* pretty printer for serialization.
*/
public ObjectWriter withDefaultPrettyPrinter() {
return with(_config.getDefaultPrettyPrinter());
}
/**
* 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()) {
return this;
}
return _new(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) {
return _new(_generatorSettings.with(pp), _prefetch);
}
/**
* 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.
*<p>
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*
* @param rootName Root name to use, if non-empty; `null` for "use defaults",
* and empty String ("") for "do NOT add root wrapper"
*/
public ObjectWriter withRootName(String rootName) {
return _new(this, _config.withRootName(rootName));
}
/**
* @since 2.6
*/
public ObjectWriter withRootName(PropertyName rootName) {
return _new(this, _config.withRootName(rootName));
}
/**
* Convenience method that is same as calling:
*<code>
* withRootName("")
*</code>
* which will forcibly prevent use of root name wrapping when writing
* values with this {@link ObjectWriter}.
*
* @since 2.6
*/
public ObjectWriter withoutRootName() {
return _new(this, _config.withRootName(PropertyName.NO_NAME));
}
/**
* Method that will construct a new instance that uses specific format schema
* for serialization.
*<p>
* Note that method does NOT change state of this reader, but
* rather construct and returns a newly configured instance.
*/
public ObjectWriter with(FormatSchema schema) {
_verifySchemaType(schema);
return _new(_generatorSettings.with(schema), _prefetch);
}
/**
* @deprecated Since 2.5 use {@link #with(FormatSchema)} instead
*/
@Deprecated
public ObjectWriter withSchema(FormatSchema schema) {
return with(schema);
}
/**
* Method that will construct a new instance that uses specified
* serialization view for serialization (with null basically disables
* view processing)
*<p>
* 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) {
return _new(this, _config.withView(view));
}
public ObjectWriter with(Locale l) {
return _new(this, _config.with(l));
}
public ObjectWriter with(TimeZone tz) {
return _new(this, _config.with(tz));
}
/**
* Method that will construct a new instance that uses specified default
* {@link Base64Variant} for base64 encoding
*
* @since 2.1
*/
public ObjectWriter with(Base64Variant b64variant) {
return _new(this, _config.with(b64variant));
}
/**
* @since 2.3
*/
public ObjectWriter with(CharacterEscapes escapes) {
return _new(_generatorSettings.with(escapes), _prefetch);
}
/**
* @since 2.3
*/
public ObjectWriter with(JsonFactory f) {
return (f == _generatorFactory) ? this : _new(this, f);
}
/**
* @since 2.3
*/
public ObjectWriter with(ContextAttributes attrs) {
return _new(this, _config.with(attrs));
}
/**
* Mutant factory method that allows construction of a new writer instance
* that uses specified set of default attribute values.
*
* @since 2.3
*/
public ObjectWriter withAttributes(Map<?,?> attrs) {
return _new(this, _config.withAttributes(attrs));
}
/**
* @since 2.3
*/
public ObjectWriter withAttribute(Object key, Object value) {
return _new(this, _config.withAttribute(key, value));
}
/**
* @since 2.3
*/
public ObjectWriter withoutAttribute(Object key) {
return _new(this, _config.withoutAttribute(key));
}
/**
* @since 2.5
*/
public ObjectWriter withRootValueSeparator(String sep) {
return _new(_generatorSettings.withRootValueSeparator(sep), _prefetch);
}
/**
* @since 2.5
*/
public ObjectWriter withRootValueSeparator(SerializableString sep) {
return _new(_generatorSettings.withRootValueSeparator(sep), _prefetch);
}
/*
/**********************************************************
/* Factory methods for creating JsonGenerators (added in 2.11)
/**********************************************************
*/
/**
* Factory method for constructing properly initialized {@link JsonGenerator}
* to write content using specified {@link OutputStream}.
* Generator is not managed (or "owned") by ObjectWriter: caller is responsible
* for properly closing it once content generation is complete.
*
* @since 2.11
*/
public JsonGenerator createGenerator(OutputStream out) throws IOException {
_assertNotNull("out", out);
return _configureGenerator(_generatorFactory.createGenerator(out, JsonEncoding.UTF8));
}
/**
* Factory method for constructing properly initialized {@link JsonGenerator}
* to write content using specified {@link OutputStream} and encoding.
* Generator is not managed (or "owned") by ObjectWriter: caller is responsible
* for properly closing it once content generation is complete.
*
* @since 2.11
*/
public JsonGenerator createGenerator(OutputStream out, JsonEncoding enc) throws IOException {
_assertNotNull("out", out);
return _configureGenerator(_generatorFactory.createGenerator(out, enc));
}
/**
* Factory method for constructing properly initialized {@link JsonGenerator}
* to write content using specified {@link Writer}.
* Generator is not managed (or "owned") by ObjectWriter: caller is responsible
* for properly closing it once content generation is complete.
*
* @since 2.11
*/
public JsonGenerator createGenerator(Writer w) throws IOException {
_assertNotNull("w", w);
return _configureGenerator(_generatorFactory.createGenerator(w));
}
/**
* Factory method for constructing properly initialized {@link JsonGenerator}
* to write content to specified {@link File}, using specified encoding.
* Generator is not managed (or "owned") by ObjectWriter: caller is responsible
* for properly closing it once content generation is complete.
*
* @since 2.11
*/
public JsonGenerator createGenerator(File outputFile, JsonEncoding enc) throws IOException {
_assertNotNull("outputFile", outputFile);
return _configureGenerator(_generatorFactory.createGenerator(outputFile, enc));
}
/**
* Factory method for constructing properly initialized {@link JsonGenerator}
* to write content using specified {@link DataOutput}.
* Generator is not managed (or "owned") by ObjectWriter: caller is responsible
* for properly closing it once content generation is complete.
*
* @since 2.11
*/
public JsonGenerator createGenerator(DataOutput out) throws IOException {
_assertNotNull("out", out);
return _configureGenerator(_generatorFactory.createGenerator(out));
}
/*
/**********************************************************
/* Factory methods for sequence writers (2.5)
/**********************************************************
*/
/**
* Method for creating a {@link SequenceWriter} to write a sequence of root
* values using configuration of this {@link ObjectWriter}.
* Sequence is not surrounded by JSON array; some backend types may not
* support writing of such sequences as root level.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*
* @param out Target file to write value sequence to.
*
* @since 2.5
*/
public SequenceWriter writeValues(File out) throws IOException {
return _newSequenceWriter(false, createGenerator(out, JsonEncoding.UTF8), true);
}
/**
* Method for creating a {@link SequenceWriter} to write a sequence of root
* values using configuration of this {@link ObjectWriter}.
* Sequence is not surrounded by JSON array; some backend types may not
* support writing of such sequences as root level.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure that all content gets flushed by
* the generator. However, since a {@link JsonGenerator} is explicitly passed,
* it will NOT be closed when {@link SequenceWriter#close()} is called.
*
* @param g Low-level generator caller has already constructed that will
* be used for actual writing of token stream.
*
* @since 2.5
*/
public SequenceWriter writeValues(JsonGenerator g) throws IOException {
_assertNotNull("g", g);
return _newSequenceWriter(false, _configureGenerator(g), false);
}
/**
* Method for creating a {@link SequenceWriter} to write a sequence of root
* values using configuration of this {@link ObjectWriter}.
* Sequence is not surrounded by JSON array; some backend types may not
* support writing of such sequences as root level.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*
* @param out Target writer to use for writing the token stream
*
* @since 2.5
*/
public SequenceWriter writeValues(Writer out) throws IOException {
return _newSequenceWriter(false, createGenerator(out), true);
}
/**
* Method for creating a {@link SequenceWriter} to write a sequence of root
* values using configuration of this {@link ObjectWriter}.
* Sequence is not surrounded by JSON array; some backend types may not
* support writing of such sequences as root level.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*
* @param out Physical output stream to use for writing the token stream
*
* @since 2.5
*/
public SequenceWriter writeValues(OutputStream out) throws IOException {
return _newSequenceWriter(false, createGenerator(out, JsonEncoding.UTF8), true);
}
/**
* @since 2.8
*/
public SequenceWriter writeValues(DataOutput out) throws IOException {
return _newSequenceWriter(false, createGenerator(out), true);
}
/**
* Method for creating a {@link SequenceWriter} to write an array of
* root-level values, using configuration of this {@link ObjectWriter}.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*<p>
* Note that the type to use with {@link ObjectWriter#forType(Class)} needs to
* be type of individual values (elements) to write and NOT matching array
* or {@link java.util.Collection} type.
*
* @param out File to write token stream to
*
* @since 2.5
*/
public SequenceWriter writeValuesAsArray(File out) throws IOException {
return _newSequenceWriter(true, createGenerator(out, JsonEncoding.UTF8), true);
}
/**
* Method for creating a {@link SequenceWriter} to write an array of
* root-level values, using configuration of this {@link ObjectWriter}.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure that all content gets flushed by
* the generator. However, since a {@link JsonGenerator} is explicitly passed,
* it will NOT be closed when {@link SequenceWriter#close()} is called.
*<p>
* Note that the type to use with {@link ObjectWriter#forType(Class)} needs to
* be type of individual values (elements) to write and NOT matching array
* or {@link java.util.Collection} type.
*
* @param gen Underlying generator to use for writing the token stream
*
* @since 2.5
*/
public SequenceWriter writeValuesAsArray(JsonGenerator gen) throws IOException {
_assertNotNull("gen", gen);
return _newSequenceWriter(true, gen, false);
}
/**
* Method for creating a {@link SequenceWriter} to write an array of
* root-level values, using configuration of this {@link ObjectWriter}.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*<p>
* Note that the type to use with {@link ObjectWriter#forType(Class)} needs to
* be type of individual values (elements) to write and NOT matching array
* or {@link java.util.Collection} type.
*
* @param out Writer to use for writing the token stream
*
* @since 2.5
*/
public SequenceWriter writeValuesAsArray(Writer out) throws IOException {
return _newSequenceWriter(true, createGenerator(out), true);
}
/**
* Method for creating a {@link SequenceWriter} to write an array of
* root-level values, using configuration of this {@link ObjectWriter}.
* Resulting writer needs to be {@link SequenceWriter#close()}d after all
* values have been written to ensure closing of underlying generator and
* output stream.
*<p>
* Note that the type to use with {@link ObjectWriter#forType(Class)} needs to
* be type of individual values (elements) to write and NOT matching array
* or {@link java.util.Collection} type.
*
* @param out Physical output stream to use for writing the token stream
*
* @since 2.5
*/
public SequenceWriter writeValuesAsArray(OutputStream out) throws IOException {
return _newSequenceWriter(true, createGenerator(out, JsonEncoding.UTF8), true);
}
/**
* @since 2.8
*/
public SequenceWriter writeValuesAsArray(DataOutput out) throws IOException {
return _newSequenceWriter(true, createGenerator(out), true);
}
/*
/**********************************************************
/* Simple accessors
/**********************************************************
*/
public boolean isEnabled(SerializationFeature f) {
return _config.isEnabled(f);
}
public boolean isEnabled(MapperFeature f) {
return _config.isEnabled(f);
}
/**
* @since 2.14
*/
public boolean isEnabled(DatatypeFeature f) {
return _config.isEnabled(f);
}
/**
* @since 2.9
*/
@Deprecated
public boolean isEnabled(JsonParser.Feature f) {
return _generatorFactory.isEnabled(f);
}
/**
* @since 2.9
*/
public boolean isEnabled(JsonGenerator.Feature f) {
return _generatorFactory.isEnabled(f);
}
/**
* @since 2.11
*/
public boolean isEnabled(StreamWriteFeature f) {
return _generatorFactory.isEnabled(f);
}
/**
* @since 2.2
*/
public SerializationConfig getConfig() {
return _config;
}
/**
* @since 2.2
*/
public JsonFactory getFactory() {
return _generatorFactory;
}
public TypeFactory getTypeFactory() {
return _config.getTypeFactory();
}
/**
* Diagnostics method that can be called to check whether this writer
* has pre-fetched serializer to use: pre-fetching improves performance
* when writer instances are reused as it avoids a per-call serializer
* lookup.
*
* @since 2.2
*/
public boolean hasPrefetchedSerializer() {
return _prefetch.hasSerializer();
}
/**
* @since 2.3
*/
public ContextAttributes getAttributes() {
return _config.getAttributes();
}
/*
/**********************************************************
/* Serialization methods; ones from ObjectCodec first
/**********************************************************
*/
/**
* Method that can be used to serialize any Java value as
* JSON output, using provided {@link JsonGenerator}.
*<p>
* Note that the given {@link JsonGenerator} is not closed; caller
* is expected to handle that as necessary.
*/
public void writeValue(JsonGenerator g, Object value) throws IOException
{
_assertNotNull("g", g);
_configureGenerator(g);
if (_config.isEnabled(SerializationFeature.CLOSE_CLOSEABLE)
&& (value instanceof Closeable)) {
Closeable toClose = (Closeable) value;
try {
_prefetch.serialize(g, value, _serializerProvider());
if (_config.isEnabled(SerializationFeature.FLUSH_AFTER_WRITE_VALUE)) {
g.flush();
}
} catch (Exception e) {
ClassUtil.closeOnFailAndThrowAsIOE(null, toClose, e);
return;
}
toClose.close();
} else {
_prefetch.serialize(g, value, _serializerProvider());
if (_config.isEnabled(SerializationFeature.FLUSH_AFTER_WRITE_VALUE)) {
g.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, StreamWriteException, DatabindException
{
_writeValueAndClose(createGenerator(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}).
*<p>
* 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, StreamWriteException, DatabindException
{
_writeValueAndClose(createGenerator(out, JsonEncoding.UTF8), value);
}
/**
* Method that can be used to serialize any Java value as
* JSON output, using Writer provided.
*<p>
* 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, StreamWriteException, DatabindException
{
_writeValueAndClose(createGenerator(w), value);
}
/**
* @since 2.8
*/
public void writeValue(DataOutput out, Object value)
throws IOException, StreamWriteException, DatabindException
{
_writeValueAndClose(createGenerator(out), 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.
*<p>
* 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(_generatorFactory._getBufferRecycler());
try {
_writeValueAndClose(createGenerator(sw), value);
return sw.getAndClear();
} catch (JsonProcessingException e) {
throw e;
} catch (IOException e) { // shouldn't really happen, but is declared as possibility so:
throw JsonMappingException.fromUnexpectedIOE(e);
}
}
/**
* 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.
*<p>
* Note: prior to version 2.1, throws clause included {@link IOException}; 2.1 removed it.
*/
public byte[] writeValueAsBytes(Object value)
throws JsonProcessingException
{
// Although 'close()' is NOP, use auto-close to avoid lgtm complaints
try (ByteArrayBuilder bb = new ByteArrayBuilder(_generatorFactory._getBufferRecycler())) {
_writeValueAndClose(createGenerator(bb, JsonEncoding.UTF8), value);
final byte[] result = bb.toByteArray();
bb.release();
return result;
} 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);
}
}
/*
/**********************************************************
/* Other public methods
/**********************************************************
*/
/**
* Method for visiting type hierarchy for given type, using specified visitor.
* Visitation uses <code>Serializer</code> hierarchy and related properties
*<p>
* This method can be used for things like
* generating <a href="http://json-schema.org/">Json Schema</a>
* instance for specified type.
*
* @param type Type to generate schema for (possibly with generic signature)
*
* @since 2.2
*/
public void acceptJsonFormatVisitor(JavaType type, JsonFormatVisitorWrapper visitor)
throws JsonMappingException
{
_assertNotNull("type", type);
_assertNotNull("visitor", visitor);
_serializerProvider().acceptJsonFormatVisitor(type, visitor);
}
/**
* Since 2.6
*/
public void acceptJsonFormatVisitor(Class<?> type, JsonFormatVisitorWrapper visitor)
throws JsonMappingException
{
_assertNotNull("type", type);
_assertNotNull("visitor", visitor);
acceptJsonFormatVisitor(_config.constructType(type), visitor);
}
public boolean canSerialize(Class<?> type) {
_assertNotNull("type", type);
return _serializerProvider().hasSerializerFor(type, null);
}
/**
* Method for checking whether instances of given type can be serialized,
* and optionally why (as per {@link Throwable} returned).
*
* @since 2.3
*/
public boolean canSerialize(Class<?> type, AtomicReference<Throwable> cause) {
_assertNotNull("type", type);
return _serializerProvider().hasSerializerFor(type, cause);
}
/*
/**********************************************************
/* Overridable helper methods
/**********************************************************
*/
/**
* Overridable helper method used for constructing
* {@link SerializerProvider} to use for serialization.
*/
protected DefaultSerializerProvider _serializerProvider() {
return _serializerProvider.createInstance(_config, _serializerFactory);
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
/**
* @since 2.2
*/
protected void _verifySchemaType(FormatSchema schema)
{
if (schema != null) {
if (!_generatorFactory.canUseSchema(schema)) {
throw new IllegalArgumentException("Cannot use FormatSchema of type "+schema.getClass().getName()
+" for format "+_generatorFactory.getFormatName());
}
}
}
/**
* Method called to configure the generator as necessary and then
* call write functionality
*
* @since 2.11.2
*/
protected final void _writeValueAndClose(JsonGenerator gen, Object value) throws IOException
{
if (_config.isEnabled(SerializationFeature.CLOSE_CLOSEABLE) && (value instanceof Closeable)) {
_writeCloseable(gen, value);
return;
}
try {
_prefetch.serialize(gen, value, _serializerProvider());
} catch (Exception e) {
ClassUtil.closeOnFailAndThrowAsIOE(gen, e);
return;
}
gen.close();
}
/**
* Helper method used when value to serialize is {@link Closeable} and its <code>close()</code>
* method is to be called right after serialization has been called
*/
private final void _writeCloseable(JsonGenerator gen, Object value)
throws IOException
{
Closeable toClose = (Closeable) value;
try {
_prefetch.serialize(gen, value, _serializerProvider());
Closeable tmpToClose = toClose;
toClose = null;
tmpToClose.close();
} catch (Exception e) {
ClassUtil.closeOnFailAndThrowAsIOE(gen, toClose, e);
return;
}
gen.close();
}
/**
* Helper method called to set or override settings of passed-in
* {@link JsonGenerator}
*
* @since 2.5
*/
protected final JsonGenerator _configureGenerator(JsonGenerator gen)
{
// order is slightly significant: both may change PrettyPrinter
// settings.
_config.initialize(gen); // since 2.5
_generatorSettings.initialize(gen);
return gen;
}
protected final void _assertNotNull(String paramName, Object src) {
if (src == null) {
throw new IllegalArgumentException(String.format("argument \"%s\" is null", paramName));
}
}
/*
/**********************************************************
/* Helper classes for configuration
/**********************************************************
*/
/**
* Helper class used for containing settings specifically related
* to (re)configuring {@link JsonGenerator} constructed for
* writing output.
*
* @since 2.5
*/
public final static class GeneratorSettings
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
public final static GeneratorSettings empty = new GeneratorSettings(null, null, null, null);
/**
* To allow for dynamic enabling/disabling of pretty printing,
* pretty printer can be optionally configured for writer
* as well
*/
public final PrettyPrinter prettyPrinter;
/**
* When using data format that uses a schema, schema is passed
* to generator.
*/
public final FormatSchema schema;
/**
* Caller may want to specify character escaping details, either as
* defaults, or on call-by-call basis.
*/
public final CharacterEscapes characterEscapes;
/**
* Caller may want to override so-called "root value separator",
* String added (verbatim, with no quoting or escaping) between
* values in root context. Default value is a single space character,
* but this is often changed to linefeed.
*/
public final SerializableString rootValueSeparator;
public GeneratorSettings(PrettyPrinter pp, FormatSchema sch,
CharacterEscapes esc, SerializableString rootSep) {
prettyPrinter = pp;
schema = sch;
characterEscapes = esc;
rootValueSeparator = rootSep;
}
public GeneratorSettings with(PrettyPrinter pp) {
// since null would mean "don't care", need to use placeholder to indicate "disable"
if (pp == null) {
pp = NULL_PRETTY_PRINTER;
}
return (pp == prettyPrinter) ? this
: new GeneratorSettings(pp, schema, characterEscapes, rootValueSeparator);
}
public GeneratorSettings with(FormatSchema sch) {
return (schema == sch) ? this
: new GeneratorSettings(prettyPrinter, sch, characterEscapes, rootValueSeparator);
}
public GeneratorSettings with(CharacterEscapes esc) {
return (characterEscapes == esc) ? this
: new GeneratorSettings(prettyPrinter, schema, esc, rootValueSeparator);
}
public GeneratorSettings withRootValueSeparator(String sep) {
if (sep == null) {
if (rootValueSeparator == null) {
return this;
}
return new GeneratorSettings(prettyPrinter, schema, characterEscapes, null);
}
if (sep.equals(_rootValueSeparatorAsString())) {
return this;
}
return new GeneratorSettings(prettyPrinter, schema, characterEscapes,
new SerializedString(sep));
}
public GeneratorSettings withRootValueSeparator(SerializableString sep) {
if (sep == null) {
if (rootValueSeparator == null) {
return this;
}
return new GeneratorSettings(prettyPrinter, schema, characterEscapes, null);
}
if (sep.equals(rootValueSeparator)) {
return this;
}
return new GeneratorSettings(prettyPrinter, schema, characterEscapes, sep);
}
private final String _rootValueSeparatorAsString() {
return (rootValueSeparator == null) ? null : rootValueSeparator.getValue();
}
/**
* @since 2.6
*/
public void initialize(JsonGenerator gen)
{
PrettyPrinter pp = prettyPrinter;
if (prettyPrinter != null) {
if (pp == NULL_PRETTY_PRINTER) {
gen.setPrettyPrinter(null);
} else {
if (pp instanceof Instantiatable<?>) {
pp = (PrettyPrinter) ((Instantiatable<?>) pp).createInstance();
}
gen.setPrettyPrinter(pp);
}
}
if (characterEscapes != null) {
gen.setCharacterEscapes(characterEscapes);
}
if (schema != null) {
gen.setSchema(schema);
}
if (rootValueSeparator != null) {
gen.setRootValueSeparator(rootValueSeparator);
}
}
}
/**
* As a minor optimization, we will make an effort to pre-fetch a serializer,
* or at least relevant <code>TypeSerializer</code>, if given enough
* information.
*
* @since 2.5
*/
public final static class Prefetch
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
public final static Prefetch empty = new Prefetch(null, null, null);
/**
* Specified root serialization type to use; can be same
* as runtime type, but usually one of its super types
* (parent class or interface it implements).
*/
private 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.
*/
private final JsonSerializer<Object> valueSerializer;
/**
* When dealing with polymorphic types, we cannot pre-fetch
* serializer, but can pre-fetch {@link TypeSerializer}.
*/
private final TypeSerializer typeSerializer;
private Prefetch(JavaType rootT,
JsonSerializer<Object> ser, TypeSerializer typeSer)
{
rootType = rootT;
valueSerializer = ser;
typeSerializer = typeSer;
}
public Prefetch forRootType(ObjectWriter parent, JavaType newType) {
// First: if nominal type not defined not thing much to do
if (newType == null) {
if ((rootType == null) || (valueSerializer == null)) {
return this;
}
return new Prefetch(null, null, null);
}
// Second: if no change, nothing to do either
if (newType.equals(rootType)) {
return this;
}
// But one more trick: `java.lang.Object` has no serialized, but may
// have `TypeSerializer` to use
if (newType.isJavaLangObject()) {
DefaultSerializerProvider prov = parent._serializerProvider();
TypeSerializer typeSer;
try {
typeSer = prov.findTypeSerializer(newType);
} catch (JsonMappingException e) {
// Unlike with value serializer pre-fetch, let's not allow exception
// for TypeSerializer be swallowed
throw new RuntimeJsonMappingException(e);
}
return new Prefetch(null, null, typeSer);
}
if (parent.isEnabled(SerializationFeature.EAGER_SERIALIZER_FETCH)) {
DefaultSerializerProvider prov = parent._serializerProvider();
// 17-Dec-2014, tatu: Need to be bit careful here; TypeSerializers are NOT cached,
// so although it'd seem like a good idea to look for those first, and avoid
// serializer for polymorphic types, it is actually more efficient to do the
// reverse here.
try {
JsonSerializer<Object> ser = prov.findTypedValueSerializer(newType, true, null);
// Important: for polymorphic types, "unwrap"...
if (ser instanceof TypeWrappedSerializer) {
return new Prefetch(newType, null,
((TypeWrappedSerializer) ser).typeSerializer());
}
return new Prefetch(newType, ser, null);
} catch (DatabindException e) {
// need to swallow?
;
}
}
return new Prefetch(newType, null, typeSerializer);
}
public final JsonSerializer<Object> getValueSerializer() {
return valueSerializer;
}
public final TypeSerializer getTypeSerializer() {
return typeSerializer;
}
public boolean hasSerializer() {
return (valueSerializer != null) || (typeSerializer != null);
}
public void serialize(JsonGenerator gen, Object value, DefaultSerializerProvider prov)
throws IOException
{
if (typeSerializer != null) {
prov.serializePolymorphic(gen, value, rootType, valueSerializer, typeSerializer);
} else if (valueSerializer != null) {
prov.serializeValue(gen, value, rootType, valueSerializer);
} else if (rootType != null) {
prov.serializeValue(gen, value, rootType);
} else {
prov.serializeValue(gen, value);
}
}
}
}