com.fasterxml.jackson.core.JsonFactory Maven / Gradle / Ivy
Show all versions of jackson-core Show documentation
/* Jackson JSON-processor.
*
* Copyright (c) 2007- Tatu Saloranta, [email protected]
*/
package com.fasterxml.jackson.core;
import java.io.*;
import java.lang.ref.SoftReference;
import java.net.URL;
import com.fasterxml.jackson.core.format.InputAccessor;
import com.fasterxml.jackson.core.format.MatchStrength;
import com.fasterxml.jackson.core.io.*;
import com.fasterxml.jackson.core.json.*;
import com.fasterxml.jackson.core.json.async.NonBlockingJsonParser;
import com.fasterxml.jackson.core.sym.ByteQuadsCanonicalizer;
import com.fasterxml.jackson.core.sym.CharsToNameCanonicalizer;
import com.fasterxml.jackson.core.util.BufferRecycler;
import com.fasterxml.jackson.core.util.BufferRecyclers;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
/**
* The main factory class of Jackson package, used to configure and
* construct reader (aka parser, {@link JsonParser})
* and writer (aka generator, {@link JsonGenerator})
* instances.
*
* Factory instances are thread-safe and reusable after configuration
* (if any). Typically applications and services use only a single
* globally shared factory instance, unless they need differently
* configured factories. Factory reuse is important if efficiency matters;
* most recycling of expensive construct is done on per-factory basis.
*
* Creation of a factory instance is a light-weight operation,
* and since there is no need for pluggable alternative implementations
* (as there is no "standard" JSON processor API to implement),
* the default constructor is used for constructing factory
* instances.
*
* @author Tatu Saloranta
*/
@SuppressWarnings("resource")
public class JsonFactory
extends TokenStreamFactory
implements Versioned,
java.io.Serializable // since 2.1 (for Android, mostly)
{
private static final long serialVersionUID = 2;
/*
/**********************************************************
/* Helper types
/**********************************************************
*/
/**
* Enumeration that defines all on/off features that can only be
* changed for {@link JsonFactory}.
*/
public enum Feature {
// // // Symbol handling (interning etc)
/**
* Feature that determines whether JSON object field names are
* to be canonicalized using {@link String#intern} or not:
* if enabled, all field names will be intern()ed (and caller
* can count on this being true for all such names); if disabled,
* no intern()ing is done. There may still be basic
* canonicalization (that is, same String will be used to represent
* all identical object property names for a single document).
*
* Note: this setting only has effect if
* {@link #CANONICALIZE_FIELD_NAMES} is true -- otherwise no
* canonicalization of any sort is done.
*
* This setting is enabled by default.
*/
INTERN_FIELD_NAMES(true),
/**
* Feature that determines whether JSON object field names are
* to be canonicalized (details of how canonicalization is done
* then further specified by
* {@link #INTERN_FIELD_NAMES}).
*
* This setting is enabled by default.
*/
CANONICALIZE_FIELD_NAMES(true),
/**
* Feature that determines what happens if we encounter a case in symbol
* handling where number of hash collisions exceeds a safety threshold
* -- which almost certainly means a denial-of-service attack via generated
* duplicate hash codes.
* If feature is enabled, an {@link IllegalStateException} is
* thrown to indicate the suspected denial-of-service attack; if disabled, processing continues but
* canonicalization (and thereby intern()ing) is disabled) as protective
* measure.
*
* This setting is enabled by default.
*
* @since 2.4
*/
FAIL_ON_SYMBOL_HASH_OVERFLOW(true),
/**
* Feature that determines whether we will use {@link BufferRecycler} with
* {@link ThreadLocal} and {@link SoftReference}, for efficient reuse of
* underlying input/output buffers.
* This usually makes sense on normal J2SE/J2EE server-side processing;
* but may not make sense on platforms where {@link SoftReference} handling
* is broken (like Android), or if there are retention issues due to
* {@link ThreadLocal} (see
* Issue #189
* for a possible case)
*
* This setting is enabled by default.
*
* @since 2.6
*/
USE_THREAD_LOCAL_FOR_BUFFER_RECYCLING(true)
;
/**
* Whether feature is enabled or disabled by default.
*/
private final boolean _defaultState;
/**
* Method that calculates bit set (flags) of all features that
* are enabled by default.
*/
public static int collectDefaults() {
int flags = 0;
for (Feature f : values()) {
if (f.enabledByDefault()) { flags |= f.getMask(); }
}
return flags;
}
private Feature(boolean defaultState) { _defaultState = defaultState; }
public boolean enabledByDefault() { return _defaultState; }
public boolean enabledIn(int flags) { return (flags & getMask()) != 0; }
public int getMask() { return (1 << ordinal()); }
}
/*
/**********************************************************
/* Constants
/**********************************************************
*/
/**
* Name used to identify JSON format
* (and returned by {@link #getFormatName()}
*/
public final static String FORMAT_NAME_JSON = "JSON";
/**
* Bitfield (set of flags) of all factory features that are enabled by default.
*/
protected final static int DEFAULT_FACTORY_FEATURE_FLAGS = JsonFactory.Feature.collectDefaults();
/**
* Bitfield (set of flags) of all parser features that are enabled
* by default.
*/
protected final static int DEFAULT_PARSER_FEATURE_FLAGS = JsonParser.Feature.collectDefaults();
/**
* Bitfield (set of flags) of all generator features that are enabled
* by default.
*/
protected final static int DEFAULT_GENERATOR_FEATURE_FLAGS = JsonGenerator.Feature.collectDefaults();
public final static SerializableString DEFAULT_ROOT_VALUE_SEPARATOR = DefaultPrettyPrinter.DEFAULT_ROOT_VALUE_SEPARATOR;
/**
* @since 2.10
*/
public final static char DEFAULT_QUOTE_CHAR = '"';
/*
/**********************************************************
/* Buffer, symbol table management
/**********************************************************
*/
/**
* Each factory comes equipped with a shared root symbol table.
* It should not be linked back to the original blueprint, to
* avoid contents from leaking between factories.
*/
protected final transient CharsToNameCanonicalizer _rootCharSymbols = CharsToNameCanonicalizer.createRoot();
/**
* Alternative to the basic symbol table, some stream-based
* parsers use different name canonicalization method.
*
* TODO: should clean up this; looks messy having 2 alternatives
* with not very clear differences.
*
* @since 2.6
*/
protected final transient ByteQuadsCanonicalizer _byteSymbolCanonicalizer = ByteQuadsCanonicalizer.createRoot();
/*
/**********************************************************
/* Configuration, simple feature flags
/**********************************************************
*/
/**
* Currently enabled factory features.
*/
protected int _factoryFeatures = DEFAULT_FACTORY_FEATURE_FLAGS;
/**
* Currently enabled parser features.
*/
protected int _parserFeatures = DEFAULT_PARSER_FEATURE_FLAGS;
/**
* Currently enabled generator features.
*/
protected int _generatorFeatures = DEFAULT_GENERATOR_FEATURE_FLAGS;
/*
/**********************************************************
/* Configuration, helper objects
/**********************************************************
*/
/**
* Object that implements conversion functionality between
* Java objects and JSON content. For base JsonFactory implementation
* usually not set by default, but can be explicitly set.
* Sub-classes (like @link org.codehaus.jackson.map.MappingJsonFactory}
* usually provide an implementation.
*/
protected ObjectCodec _objectCodec;
/**
* Definition of custom character escapes to use for generators created
* by this factory, if any. If null, standard data format specific
* escapes are used.
*/
protected CharacterEscapes _characterEscapes;
/**
* Optional helper object that may decorate input sources, to do
* additional processing on input during parsing.
*/
protected InputDecorator _inputDecorator;
/**
* Optional helper object that may decorate output object, to do
* additional processing on output during content generation.
*/
protected OutputDecorator _outputDecorator;
/**
* Separator used between root-level values, if any; null indicates
* "do not add separator".
* Default separator is a single space character.
*
* @since 2.1
*/
protected SerializableString _rootValueSeparator = DEFAULT_ROOT_VALUE_SEPARATOR;
/**
* Optional threshold used for automatically escaping character above certain character
* code value: either {@code 0} to indicate that no threshold is specified, or value
* at or above 127 to indicate last character code that is NOT automatically escaped
* (but depends on other configuration rules for checking).
*
* @since 2.10
*/
protected int _maximumNonEscapedChar;
/**
* Character used for quoting field names (if field name quoting has not
* been disabled with {@link JsonWriteFeature#QUOTE_FIELD_NAMES})
* and JSON String values.
*/
protected final char _quoteChar;
/*
/**********************************************************
/* Construction
/**********************************************************
*/
/**
* Default constructor used to create factory instances.
* Creation of a factory instance is a light-weight operation,
* but it is still a good idea to reuse limited number of
* factory instances (and quite often just a single instance):
* factories are used as context for storing some reused
* processing objects (such as symbol tables parsers use)
* and this reuse only works within context of a single
* factory instance.
*/
public JsonFactory() { this((ObjectCodec) null); }
public JsonFactory(ObjectCodec oc) {
_objectCodec = oc;
_quoteChar = DEFAULT_QUOTE_CHAR;
}
/**
* Constructor used when copy()ing a factory instance.
*
* @since 2.2.1
*/
protected JsonFactory(JsonFactory src, ObjectCodec codec)
{
_objectCodec = codec;
// General
_factoryFeatures = src._factoryFeatures;
_parserFeatures = src._parserFeatures;
_generatorFeatures = src._generatorFeatures;
_inputDecorator = src._inputDecorator;
_outputDecorator = src._outputDecorator;
// JSON-specific
_characterEscapes = src._characterEscapes;
_rootValueSeparator = src._rootValueSeparator;
_maximumNonEscapedChar = src._maximumNonEscapedChar;
_quoteChar = src._quoteChar;
}
/**
* Constructor used by {@link JsonFactoryBuilder} for instantiation.
*
* @since 2.10
*/
public JsonFactory(JsonFactoryBuilder b) {
_objectCodec = null;
// General
_factoryFeatures = b._factoryFeatures;
_parserFeatures = b._streamReadFeatures;
_generatorFeatures = b._streamWriteFeatures;
_inputDecorator = b._inputDecorator;
_outputDecorator = b._outputDecorator;
// JSON-specific
_characterEscapes = b._characterEscapes;
_rootValueSeparator = b._rootValueSeparator;
_maximumNonEscapedChar = b._maximumNonEscapedChar;
_quoteChar = b._quoteChar;
}
/**
* Constructor for subtypes; needed to work around the fact that before 3.0,
* this factory has cumbersome dual role as generic type as well as actual
* implementation for json.
*
* @param b Builder that contains information
* @param bogus Argument only needed to separate constructor signature; ignored
*/
protected JsonFactory(TSFBuilder b, boolean bogus) {
_objectCodec = null;
_factoryFeatures = b._factoryFeatures;
_parserFeatures = b._streamReadFeatures;
_generatorFeatures = b._streamWriteFeatures;
_inputDecorator = b._inputDecorator;
_outputDecorator = b._outputDecorator;
// JSON-specific: need to assign even if not really used
_characterEscapes = null;
_rootValueSeparator = null;
_maximumNonEscapedChar = 0;
_quoteChar = DEFAULT_QUOTE_CHAR;
}
/**
* Method that allows construction of differently configured factory, starting
* with settings of this factory.
*
* @since 2.10
*/
public TSFBuilder rebuild() {
// 13-Jun-2018, tatu: Verify sub-classing to prevent strange bugs in format impls
_requireJSONFactory("Factory implementation for format (%s) MUST override `rebuild()` method");
return new JsonFactoryBuilder(this);
}
/**
* Main factory method to use for constructing {@link JsonFactory} instances with
* different configuration: creates and returns a builder for collecting configuration
* settings; instance created by calling {@code build()} after all configuration
* set.
*
* NOTE: signature unfortunately does not expose true implementation type; this
* will be fixed in 3.0.
*/
public static TSFBuilder builder() {
return new JsonFactoryBuilder();
}
/**
* Method for constructing a new {@link JsonFactory} that has
* the same settings as this instance, but is otherwise
* independent (i.e. nothing is actually shared, symbol tables
* are separate).
* Note that {@link ObjectCodec} reference is not copied but is
* set to null; caller typically needs to set it after calling
* this method. Reason for this is that the codec is used for
* callbacks, and assumption is that there is strict 1-to-1
* mapping between codec, factory. Caller has to, then, explicitly
* set codec after making the copy.
*
* @since 2.1
*/
public JsonFactory copy()
{
_checkInvalidCopy(JsonFactory.class);
// as per above, do clear ObjectCodec
return new JsonFactory(this, null);
}
/**
* @since 2.1
*/
protected void _checkInvalidCopy(Class exp)
{
if (getClass() != exp) {
throw new IllegalStateException("Failed copy(): "+getClass().getName()
+" (version: "+version()+") does not override copy(); it has to");
}
}
/*
/**********************************************************
/* Serializable overrides
/**********************************************************
*/
/**
* Method that we need to override to actually make restoration go
* through constructors etc.
* Also: must be overridden by sub-classes as well.
*/
protected Object readResolve() {
return new JsonFactory(this, _objectCodec);
}
/*
/**********************************************************
/* Capability introspection
/**********************************************************
*/
/**
* Introspection method that higher-level functionality may call
* to see whether underlying data format requires a stable ordering
* of object properties or not.
* This is usually used for determining
* whether to force a stable ordering (like alphabetic ordering by name)
* if no ordering if explicitly specified.
*
* Default implementation returns false as JSON does NOT
* require stable ordering. Formats that require ordering include positional
* textual formats like CSV, and schema-based binary formats
* like Avro.
*
* @since 2.3
*/
@Override
public boolean requiresPropertyOrdering() { return false; }
/**
* Introspection method that higher-level functionality may call
* to see whether underlying data format can read and write binary
* data natively; that is, embeded it as-is without using encodings
* such as Base64.
*
* Default implementation returns false as JSON does not
* support native access: all binary content must use Base64 encoding.
* Most binary formats (like Smile and Avro) support native binary content.
*
* @since 2.3
*/
@Override
public boolean canHandleBinaryNatively() { return false; }
/**
* Introspection method that can be used by base factory to check
* whether access using char[] is something that actual
* parser implementations can take advantage of, over having to
* use {@link java.io.Reader}. Sub-types are expected to override
* definition; default implementation (suitable for JSON) alleges
* that optimization are possible; and thereby is likely to try
* to access {@link java.lang.String} content by first copying it into
* recyclable intermediate buffer.
*
* @since 2.4
*/
public boolean canUseCharArrays() { return true; }
/**
* Introspection method that can be used to check whether this
* factory can create non-blocking parsers: parsers that do not
* use blocking I/O abstractions but instead use a
* {@link com.fasterxml.jackson.core.async.NonBlockingInputFeeder}.
*
* @since 2.9
*/
@Override
public boolean canParseAsync() {
// 31-May-2017, tatu: Jackson 2.9 does support async parsing for JSON,
// but not all other formats, so need to do this:
return _isJSONFactory();
}
@Override
public Class getFormatReadFeatureType() {
return null;
}
@Override
public Class getFormatWriteFeatureType() {
return null;
}
/*
/**********************************************************
/* Format detection functionality
/**********************************************************
*/
/**
* Method that can be used to quickly check whether given schema
* is something that parsers and/or generators constructed by this
* factory could use. Note that this means possible use, at the level
* of data format (i.e. schema is for same data format as parsers and
* generators this factory constructs); individual schema instances
* may have further usage restrictions.
*
* @since 2.1
*/
@Override
public boolean canUseSchema(FormatSchema schema) {
if (schema == null){
return false;
}
String ourFormat = getFormatName();
return (ourFormat != null) && ourFormat.equals(schema.getSchemaType());
}
/**
* Method that returns short textual id identifying format
* this factory supports.
*
* Note: sub-classes should override this method; default
* implementation will return null for all sub-classes
*/
@Override
public String getFormatName()
{
/* Somewhat nasty check: since we can't make this abstract
* (due to backwards compatibility concerns), need to prevent
* format name "leakage"
*/
if (getClass() == JsonFactory.class) {
return FORMAT_NAME_JSON;
}
return null;
}
/**
* Convenience method for trying to determine whether input via given accessor
* is of format type supported by this factory.
*/
public MatchStrength hasFormat(InputAccessor acc) throws IOException
{
// since we can't keep this abstract, only implement for "vanilla" instance
if (getClass() == JsonFactory.class) {
return hasJSONFormat(acc);
}
return null;
}
/**
* Method that can be called to determine if a custom
* {@link ObjectCodec} is needed for binding data parsed
* using {@link JsonParser} constructed by this factory
* (which typically also implies the same for serialization
* with {@link JsonGenerator}).
*
* @return True if custom codec is needed with parsers and
* generators created by this factory; false if a general
* {@link ObjectCodec} is enough
*
* @since 2.1
*/
public boolean requiresCustomCodec() {
return false;
}
/**
* Helper method that can be called to determine if content accessed
* using given accessor seems to be JSON content.
*/
protected MatchStrength hasJSONFormat(InputAccessor acc) throws IOException
{
return ByteSourceJsonBootstrapper.hasJSONFormat(acc);
}
/*
/**********************************************************
/* Versioned
/**********************************************************
*/
@Override
public Version version() {
return PackageVersion.VERSION;
}
/*
/**********************************************************
/* Configuration, factory features
/**********************************************************
*/
/**
* Method for enabling or disabling specified parser feature
* (check {@link JsonParser.Feature} for list of features)
*
* @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
*/
@Deprecated
public final JsonFactory configure(JsonFactory.Feature f, boolean state) {
return state ? enable(f) : disable(f);
}
/**
* Method for enabling specified parser feature
* (check {@link JsonFactory.Feature} for list of features)
*
* @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
*/
@Deprecated
public JsonFactory enable(JsonFactory.Feature f) {
_factoryFeatures |= f.getMask();
return this;
}
/**
* Method for disabling specified parser features
* (check {@link JsonFactory.Feature} for list of features)
*
* @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
*/
@Deprecated
public JsonFactory disable(JsonFactory.Feature f) {
_factoryFeatures &= ~f.getMask();
return this;
}
/**
* Checked whether specified parser feature is enabled.
*/
public final boolean isEnabled(JsonFactory.Feature f) {
return (_factoryFeatures & f.getMask()) != 0;
}
@Override
public final int getParserFeatures() {
return _parserFeatures;
}
@Override
public final int getGeneratorFeatures() {
return _generatorFeatures;
}
// MUST be overridden by sub-classes that support format-specific parser features
@Override
public int getFormatParserFeatures() {
return 0;
}
// MUST be overridden by sub-classes that support format-specific generator features
@Override
public int getFormatGeneratorFeatures() {
return 0;
}
/*
/**********************************************************
/* Configuration, parser configuration
/**********************************************************
*/
/**
* Method for enabling or disabling specified parser feature
* (check {@link JsonParser.Feature} for list of features)
*/
public final JsonFactory configure(JsonParser.Feature f, boolean state) {
return state ? enable(f) : disable(f);
}
/**
* Method for enabling specified parser feature
* (check {@link JsonParser.Feature} for list of features)
*/
public JsonFactory enable(JsonParser.Feature f) {
_parserFeatures |= f.getMask();
return this;
}
/**
* Method for disabling specified parser features
* (check {@link JsonParser.Feature} for list of features)
*/
public JsonFactory disable(JsonParser.Feature f) {
_parserFeatures &= ~f.getMask();
return this;
}
/**
* Checked whether specified parser feature is enabled.
*/
@Override
public final boolean isEnabled(JsonParser.Feature f) {
return (_parserFeatures & f.getMask()) != 0;
}
/**
* @since 2.10
*/
public final boolean isEnabled(StreamReadFeature f) {
return (_parserFeatures & f.mappedFeature().getMask()) != 0;
}
/**
* Method for getting currently configured input decorator (if any;
* there is no default decorator).
*/
public InputDecorator getInputDecorator() {
return _inputDecorator;
}
/**
* Method for overriding currently configured input decorator
*
* @deprecated Since 2.10 use {@link JsonFactoryBuilder#inputDecorator(InputDecorator)} instead
*/
@Deprecated
public JsonFactory setInputDecorator(InputDecorator d) {
_inputDecorator = d;
return this;
}
/*
/**********************************************************
/* Configuration, generator settings
/**********************************************************
*/
/**
* Method for enabling or disabling specified generator feature
* (check {@link JsonGenerator.Feature} for list of features)
*/
public final JsonFactory configure(JsonGenerator.Feature f, boolean state) {
return state ? enable(f) : disable(f);
}
/**
* Method for enabling specified generator features
* (check {@link JsonGenerator.Feature} for list of features)
*/
public JsonFactory enable(JsonGenerator.Feature f) {
_generatorFeatures |= f.getMask();
return this;
}
/**
* Method for disabling specified generator feature
* (check {@link JsonGenerator.Feature} for list of features)
*/
public JsonFactory disable(JsonGenerator.Feature f) {
_generatorFeatures &= ~f.getMask();
return this;
}
/**
* Check whether specified generator feature is enabled.
*/
@Override
public final boolean isEnabled(JsonGenerator.Feature f) {
return (_generatorFeatures & f.getMask()) != 0;
}
/**
* @since 2.10
*/
public final boolean isEnabled(StreamWriteFeature f) {
return (_generatorFeatures & f.mappedFeature().getMask()) != 0;
}
/**
* Method for accessing custom escapes factory uses for {@link JsonGenerator}s
* it creates.
*/
public CharacterEscapes getCharacterEscapes() { return _characterEscapes; }
/**
* Method for defining custom escapes factory uses for {@link JsonGenerator}s
* it creates.
*/
public JsonFactory setCharacterEscapes(CharacterEscapes esc) {
_characterEscapes = esc;
return this;
}
/**
* Method for getting currently configured output decorator (if any;
* there is no default decorator).
*/
public OutputDecorator getOutputDecorator() {
return _outputDecorator;
}
/**
* Method for overriding currently configured output decorator
*
* @deprecated Since 2.10 use {@link JsonFactoryBuilder#inputDecorator(InputDecorator)} instead
*/
@Deprecated
public JsonFactory setOutputDecorator(OutputDecorator d) {
_outputDecorator = d;
return this;
}
/**
* Method that allows overriding String used for separating root-level
* JSON values (default is single space character)
*
* @param sep Separator to use, if any; null means that no separator is
* automatically added
*
* @since 2.1
*/
public JsonFactory setRootValueSeparator(String sep) {
_rootValueSeparator = (sep == null) ? null : new SerializedString(sep);
return this;
}
/**
* @since 2.1
*/
public String getRootValueSeparator() {
return (_rootValueSeparator == null) ? null : _rootValueSeparator.getValue();
}
/*
/**********************************************************
/* Configuration, other
/**********************************************************
*/
/**
* Method for associating a {@link ObjectCodec} (typically
* a com.fasterxml.jackson.databind.ObjectMapper)
* with this factory (and more importantly, parsers and generators
* it constructs). This is needed to use data-binding methods
* of {@link JsonParser} and {@link JsonGenerator} instances.
*/
public JsonFactory setCodec(ObjectCodec oc) {
_objectCodec = oc;
return this;
}
public ObjectCodec getCodec() { return _objectCodec; }
/*
/**********************************************************
/* Parser factories, traditional (blocking) I/O sources
/**********************************************************
*/
/**
* Method for constructing JSON parser instance to parse
* contents of specified file.
*
*
* Encoding is auto-detected from contents according to JSON
* specification recommended mechanism. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
*
* Underlying input stream (needed for reading contents)
* will be owned (and managed, i.e. closed as need be) by
* the parser, since caller has no access to it.
*
* @param f File that contains JSON content to parse
*
* @since 2.1
*/
@Override
public JsonParser createParser(File f) throws IOException, JsonParseException {
// true, since we create InputStream from File
IOContext ctxt = _createContext(f, true);
InputStream in = new FileInputStream(f);
return _createParser(_decorate(in, ctxt), ctxt);
}
/**
* Method for constructing JSON parser instance to parse
* contents of resource reference by given URL.
*
*
* Encoding is auto-detected from contents according to JSON
* specification recommended mechanism. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
*
* Underlying input stream (needed for reading contents)
* will be owned (and managed, i.e. closed as need be) by
* the parser, since caller has no access to it.
*
* @param url URL pointing to resource that contains JSON content to parse
*
* @since 2.1
*/
@Override
public JsonParser createParser(URL url) throws IOException, JsonParseException {
// true, since we create InputStream from URL
IOContext ctxt = _createContext(url, true);
InputStream in = _optimizedStreamFromURL(url);
return _createParser(_decorate(in, ctxt), ctxt);
}
/**
* Method for constructing JSON parser instance to parse
* the contents accessed via specified input stream.
*
* The input stream will not be owned by
* the parser, it will still be managed (i.e. closed if
* end-of-stream is reacher, or parser close method called)
* if (and only if) {@link com.fasterxml.jackson.core.StreamReadFeature#AUTO_CLOSE_SOURCE}
* is enabled.
*
*
* Note: no encoding argument is taken since it can always be
* auto-detected as suggested by JSON RFC. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
* @param in InputStream to use for reading JSON content to parse
*
* @since 2.1
*/
@Override
public JsonParser createParser(InputStream in) throws IOException, JsonParseException {
IOContext ctxt = _createContext(in, false);
return _createParser(_decorate(in, ctxt), ctxt);
}
/**
* Method for constructing parser for parsing
* the contents accessed via specified Reader.
* The read stream will not be owned by
* the parser, it will still be managed (i.e. closed if
* end-of-stream is reacher, or parser close method called)
* if (and only if) {@link com.fasterxml.jackson.core.StreamReadFeature#AUTO_CLOSE_SOURCE}
* is enabled.
*
* @param r Reader to use for reading JSON content to parse
*
* @since 2.1
*/
@Override
public JsonParser createParser(Reader r) throws IOException, JsonParseException {
// false -> we do NOT own Reader (did not create it)
IOContext ctxt = _createContext(r, false);
return _createParser(_decorate(r, ctxt), ctxt);
}
/**
* Method for constructing parser for parsing
* the contents of given byte array.
*
* @since 2.1
*/
@Override
public JsonParser createParser(byte[] data) throws IOException, JsonParseException {
IOContext ctxt = _createContext(data, true);
if (_inputDecorator != null) {
InputStream in = _inputDecorator.decorate(ctxt, data, 0, data.length);
if (in != null) {
return _createParser(in, ctxt);
}
}
return _createParser(data, 0, data.length, ctxt);
}
/**
* Method for constructing parser for parsing
* the contents of given byte array.
*
* @param data Buffer that contains data to parse
* @param offset Offset of the first data byte within buffer
* @param len Length of contents to parse within buffer
*
* @since 2.1
*/
@Override
public JsonParser createParser(byte[] data, int offset, int len) throws IOException, JsonParseException {
IOContext ctxt = _createContext(data, true);
// [JACKSON-512]: allow wrapping with InputDecorator
if (_inputDecorator != null) {
InputStream in = _inputDecorator.decorate(ctxt, data, offset, len);
if (in != null) {
return _createParser(in, ctxt);
}
}
return _createParser(data, offset, len, ctxt);
}
/**
* Method for constructing parser for parsing
* contents of given String.
*
* @since 2.1
*/
@Override
public JsonParser createParser(String content) throws IOException, JsonParseException {
final int strLen = content.length();
// Actually, let's use this for medium-sized content, up to 64kB chunk (32kb char)
if ((_inputDecorator != null) || (strLen > 0x8000) || !canUseCharArrays()) {
// easier to just wrap in a Reader than extend InputDecorator; or, if content
// is too long for us to copy it over
return createParser(new StringReader(content));
}
IOContext ctxt = _createContext(content, true);
char[] buf = ctxt.allocTokenBuffer(strLen);
content.getChars(0, strLen, buf, 0);
return _createParser(buf, 0, strLen, ctxt, true);
}
/**
* Method for constructing parser for parsing
* contents of given char array.
*
* @since 2.4
*/
@Override
public JsonParser createParser(char[] content) throws IOException {
return createParser(content, 0, content.length);
}
/**
* Method for constructing parser for parsing contents of given char array.
*
* @since 2.4
*/
@Override
public JsonParser createParser(char[] content, int offset, int len) throws IOException {
if (_inputDecorator != null) { // easier to just wrap in a Reader than extend InputDecorator
return createParser(new CharArrayReader(content, offset, len));
}
return _createParser(content, offset, len, _createContext(content, true),
// important: buffer is NOT recyclable, as it's from caller
false);
}
/**
* Optional method for constructing parser for reading contents from specified {@link DataInput}
* instance.
*
* If this factory does not support {@link DataInput} as source,
* will throw {@link UnsupportedOperationException}
*
* @since 2.8
*/
@Override
public JsonParser createParser(DataInput in) throws IOException {
IOContext ctxt = _createContext(in, false);
return _createParser(_decorate(in, ctxt), ctxt);
}
/*
/**********************************************************
/* Parser factories, non-blocking (async) sources
/**********************************************************
*/
/**
* Optional method for constructing parser for non-blocking parsing
* via {@link com.fasterxml.jackson.core.async.ByteArrayFeeder}
* interface (accessed using {@link JsonParser#getNonBlockingInputFeeder()}
* from constructed instance).
*
* If this factory does not support non-blocking parsing (either at all,
* or from byte array),
* will throw {@link UnsupportedOperationException}
*
* @since 2.9
*/
@Override
public JsonParser createNonBlockingByteArrayParser() throws IOException
{
// 17-May-2017, tatu: Need to take care not to accidentally create JSON parser
// for non-JSON input:
_requireJSONFactory("Non-blocking source not (yet?) supported for this format (%s)");
IOContext ctxt = _createNonBlockingContext(null);
ByteQuadsCanonicalizer can = _byteSymbolCanonicalizer.makeChild(_factoryFeatures);
return new NonBlockingJsonParser(ctxt, _parserFeatures, can);
}
/*
/**********************************************************
/* Generator factories
/**********************************************************
*/
/**
* Method for constructing JSON generator for writing JSON content
* using specified output stream.
* Encoding to use must be specified, and needs to be one of available
* types (as per JSON specification).
*
* Underlying stream is NOT owned by the generator constructed,
* so that generator will NOT close the output stream when
* {@link JsonGenerator#close} is called (unless auto-closing
* feature,
* {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET}
* is enabled).
* Using application needs to close it explicitly if this is the case.
*
* Note: there are formats that use fixed encoding (like most binary data formats)
* and that ignore passed in encoding.
*
* @param out OutputStream to use for writing JSON content
* @param enc Character encoding to use
*
* @since 2.1
*/
@Override
public JsonGenerator createGenerator(OutputStream out, JsonEncoding enc)
throws IOException
{
// false -> we won't manage the stream unless explicitly directed to
IOContext ctxt = _createContext(out, false);
ctxt.setEncoding(enc);
if (enc == JsonEncoding.UTF8) {
return _createUTF8Generator(_decorate(out, ctxt), ctxt);
}
Writer w = _createWriter(out, enc, ctxt);
return _createGenerator(_decorate(w, ctxt), ctxt);
}
/**
* Convenience method for constructing generator that uses default
* encoding of the format (UTF-8 for JSON and most other data formats).
*
* Note: there are formats that use fixed encoding (like most binary data formats).
*
* @since 2.1
*/
@Override
public JsonGenerator createGenerator(OutputStream out) throws IOException {
return createGenerator(out, JsonEncoding.UTF8);
}
/**
* Method for constructing JSON generator for writing JSON content
* using specified Writer.
*
* Underlying stream is NOT owned by the generator constructed,
* so that generator will NOT close the Reader when
* {@link JsonGenerator#close} is called (unless auto-closing
* feature,
* {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET} is enabled).
* Using application needs to close it explicitly.
*
* @since 2.1
*
* @param w Writer to use for writing JSON content
*/
@Override
public JsonGenerator createGenerator(Writer w) throws IOException {
IOContext ctxt = _createContext(w, false);
return _createGenerator(_decorate(w, ctxt), ctxt);
}
/**
* Method for constructing JSON generator for writing JSON content
* to specified file, overwriting contents it might have (or creating
* it if such file does not yet exist).
* Encoding to use must be specified, and needs to be one of available
* types (as per JSON specification).
*
* Underlying stream is owned by the generator constructed,
* i.e. generator will handle closing of file when
* {@link JsonGenerator#close} is called.
*
* @param f File to write contents to
* @param enc Character encoding to use
*
* @since 2.1
*/
@Override
public JsonGenerator createGenerator(File f, JsonEncoding enc) throws IOException
{
OutputStream out = new FileOutputStream(f);
// true -> yes, we have to manage the stream since we created it
IOContext ctxt = _createContext(out, true);
ctxt.setEncoding(enc);
if (enc == JsonEncoding.UTF8) {
return _createUTF8Generator(_decorate(out, ctxt), ctxt);
}
Writer w = _createWriter(out, enc, ctxt);
return _createGenerator(_decorate(w, ctxt), ctxt);
}
/**
* Method for constructing generator for writing content using specified
* {@link DataOutput} instance.
*
* @since 2.8
*/
@Override
public JsonGenerator createGenerator(DataOutput out, JsonEncoding enc) throws IOException {
return createGenerator(_createDataOutputWrapper(out), enc);
}
/**
* Convenience method for constructing generator that uses default
* encoding of the format (UTF-8 for JSON and most other data formats).
*
* Note: there are formats that use fixed encoding (like most binary data formats).
*
* @since 2.8
*/
@Override
public JsonGenerator createGenerator(DataOutput out) throws IOException {
return createGenerator(_createDataOutputWrapper(out), JsonEncoding.UTF8);
}
/*
/**********************************************************
/* Deprecated parser factory methods: to be removed from 3.x
/**********************************************************
*/
/**
* Method for constructing JSON parser instance to parse
* contents of specified file.
*
* Encoding is auto-detected from contents according to JSON
* specification recommended mechanism. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
*
* Underlying input stream (needed for reading contents)
* will be owned (and managed, i.e. closed as need be) by
* the parser, since caller has no access to it.
*
* @param f File that contains JSON content to parse
*
* @deprecated Since 2.2, use {@link #createParser(File)} instead.
*/
@Deprecated
public JsonParser createJsonParser(File f) throws IOException, JsonParseException {
return createParser(f);
}
/**
* Method for constructing JSON parser instance to parse
* contents of resource reference by given URL.
*
*
* Encoding is auto-detected from contents according to JSON
* specification recommended mechanism. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
*
* Underlying input stream (needed for reading contents)
* will be owned (and managed, i.e. closed as need be) by
* the parser, since caller has no access to it.
*
* @param url URL pointing to resource that contains JSON content to parse
*
* @deprecated Since 2.2, use {@link #createParser(URL)} instead.
*/
@Deprecated
public JsonParser createJsonParser(URL url) throws IOException, JsonParseException {
return createParser(url);
}
/**
* Method for constructing JSON parser instance to parse
* the contents accessed via specified input stream.
*
* The input stream will not be owned by
* the parser, it will still be managed (i.e. closed if
* end-of-stream is reacher, or parser close method called)
* if (and only if) {@link com.fasterxml.jackson.core.JsonParser.Feature#AUTO_CLOSE_SOURCE}
* is enabled.
*
*
* Note: no encoding argument is taken since it can always be
* auto-detected as suggested by JSON RFC. Json specification
* supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
* so auto-detection implemented only for this charsets.
* For other charsets use {@link #createParser(java.io.Reader)}.
*
* @param in InputStream to use for reading JSON content to parse
*
* @deprecated Since 2.2, use {@link #createParser(InputStream)} instead.
*/
@Deprecated
public JsonParser createJsonParser(InputStream in) throws IOException, JsonParseException {
return createParser(in);
}
/**
* Method for constructing parser for parsing
* the contents accessed via specified Reader.
* The read stream will not be owned by
* the parser, it will still be managed (i.e. closed if
* end-of-stream is reacher, or parser close method called)
* if (and only if) {@link com.fasterxml.jackson.core.JsonParser.Feature#AUTO_CLOSE_SOURCE}
* is enabled.
*
* @param r Reader to use for reading JSON content to parse
*
* @deprecated Since 2.2, use {@link #createParser(Reader)} instead.
*/
@Deprecated
public JsonParser createJsonParser(Reader r) throws IOException, JsonParseException {
return createParser(r);
}
/**
* Method for constructing parser for parsing the contents of given byte array.
*
* @deprecated Since 2.2, use {@link #createParser(byte[])} instead.
*/
@Deprecated
public JsonParser createJsonParser(byte[] data) throws IOException, JsonParseException {
return createParser(data);
}
/**
* Method for constructing parser for parsing
* the contents of given byte array.
*
* @param data Buffer that contains data to parse
* @param offset Offset of the first data byte within buffer
* @param len Length of contents to parse within buffer
*
* @deprecated Since 2.2, use {@link #createParser(byte[],int,int)} instead.
*/
@Deprecated
public JsonParser createJsonParser(byte[] data, int offset, int len) throws IOException, JsonParseException {
return createParser(data, offset, len);
}
/**
* Method for constructing parser for parsing
* contents of given String.
*
* @deprecated Since 2.2, use {@link #createParser(String)} instead.
*/
@Deprecated
public JsonParser createJsonParser(String content) throws IOException, JsonParseException {
return createParser(content);
}
/*
/**********************************************************
/* Deprecated generator factory methods: to be removed from 3.x
/**********************************************************
*/
/**
* Method for constructing JSON generator for writing JSON content
* using specified output stream.
* Encoding to use must be specified, and needs to be one of available
* types (as per JSON specification).
*
* Underlying stream is NOT owned by the generator constructed,
* so that generator will NOT close the output stream when
* {@link JsonGenerator#close} is called (unless auto-closing
* feature,
* {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET}
* is enabled).
* Using application needs to close it explicitly if this is the case.
*
* Note: there are formats that use fixed encoding (like most binary data formats)
* and that ignore passed in encoding.
*
* @param out OutputStream to use for writing JSON content
* @param enc Character encoding to use
*
* @deprecated Since 2.2, use {@link #createGenerator(OutputStream, JsonEncoding)} instead.
*/
@Deprecated
public JsonGenerator createJsonGenerator(OutputStream out, JsonEncoding enc) throws IOException {
return createGenerator(out, enc);
}
/**
* Method for constructing JSON generator for writing JSON content
* using specified Writer.
*
* Underlying stream is NOT owned by the generator constructed,
* so that generator will NOT close the Reader when
* {@link JsonGenerator#close} is called (unless auto-closing
* feature,
* {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET} is enabled).
* Using application needs to close it explicitly.
*
* @param out Writer to use for writing JSON content
*
* @deprecated Since 2.2, use {@link #createGenerator(Writer)} instead.
*/
@Deprecated
public JsonGenerator createJsonGenerator(Writer out) throws IOException {
return createGenerator(out);
}
/**
* Convenience method for constructing generator that uses default
* encoding of the format (UTF-8 for JSON and most other data formats).
*
* Note: there are formats that use fixed encoding (like most binary data formats).
*
* @deprecated Since 2.2, use {@link #createGenerator(OutputStream)} instead.
*/
@Deprecated
public JsonGenerator createJsonGenerator(OutputStream out) throws IOException {
return createGenerator(out, JsonEncoding.UTF8);
}
/*
/**********************************************************
/* Factory methods used by factory for creating parser instances,
/* overridable by sub-classes
/**********************************************************
*/
/**
* Overridable factory method that actually instantiates desired parser
* given {@link InputStream} and context object.
*
* This method is specifically designed to remain
* compatible between minor versions so that sub-classes can count
* on it being called as expected. That is, it is part of official
* interface from sub-class perspective, although not a public
* method available to users of factory implementations.
*
* @since 2.1
*/
protected JsonParser _createParser(InputStream in, IOContext ctxt) throws IOException {
// As per [JACKSON-259], may want to fully disable canonicalization:
return new ByteSourceJsonBootstrapper(ctxt, in).constructParser(_parserFeatures,
_objectCodec, _byteSymbolCanonicalizer, _rootCharSymbols, _factoryFeatures);
}
/**
* Overridable factory method that actually instantiates parser
* using given {@link Reader} object for reading content.
*
* This method is specifically designed to remain
* compatible between minor versions so that sub-classes can count
* on it being called as expected. That is, it is part of official
* interface from sub-class perspective, although not a public
* method available to users of factory implementations.
*
* @since 2.1
*/
protected JsonParser _createParser(Reader r, IOContext ctxt) throws IOException {
return new ReaderBasedJsonParser(ctxt, _parserFeatures, r, _objectCodec,
_rootCharSymbols.makeChild(_factoryFeatures));
}
/**
* Overridable factory method that actually instantiates parser
* using given char[] object for accessing content.
*
* @since 2.4
*/
protected JsonParser _createParser(char[] data, int offset, int len, IOContext ctxt,
boolean recyclable) throws IOException {
return new ReaderBasedJsonParser(ctxt, _parserFeatures, null, _objectCodec,
_rootCharSymbols.makeChild(_factoryFeatures),
data, offset, offset+len, recyclable);
}
/**
* Overridable factory method that actually instantiates parser
* using given {@link Reader} object for reading content
* passed as raw byte array.
*
* This method is specifically designed to remain
* compatible between minor versions so that sub-classes can count
* on it being called as expected. That is, it is part of official
* interface from sub-class perspective, although not a public
* method available to users of factory implementations.
*/
protected JsonParser _createParser(byte[] data, int offset, int len, IOContext ctxt) throws IOException
{
return new ByteSourceJsonBootstrapper(ctxt, data, offset, len).constructParser(_parserFeatures,
_objectCodec, _byteSymbolCanonicalizer, _rootCharSymbols, _factoryFeatures);
}
/**
* Optional factory method, expected to be overridden
*
* @since 2.8
*/
protected JsonParser _createParser(DataInput input, IOContext ctxt) throws IOException
{
// 13-May-2016, tatu: Need to take care not to accidentally create JSON parser for
// non-JSON input.
_requireJSONFactory("InputData source not (yet?) supported for this format (%s)");
// Also: while we can't do full bootstrapping (due to read-ahead limitations), should
// at least handle possible UTF-8 BOM
int firstByte = ByteSourceJsonBootstrapper.skipUTF8BOM(input);
ByteQuadsCanonicalizer can = _byteSymbolCanonicalizer.makeChild(_factoryFeatures);
return new UTF8DataInputJsonParser(ctxt, _parserFeatures, input,
_objectCodec, can, firstByte);
}
/*
/**********************************************************
/* Factory methods used by factory for creating generator instances,
/* overridable by sub-classes
/**********************************************************
*/
/**
* Overridable factory method that actually instantiates generator for
* given {@link Writer} and context object.
*
* This method is specifically designed to remain
* compatible between minor versions so that sub-classes can count
* on it being called as expected. That is, it is part of official
* interface from sub-class perspective, although not a public
* method available to users of factory implementations.
*/
protected JsonGenerator _createGenerator(Writer out, IOContext ctxt) throws IOException
{
WriterBasedJsonGenerator gen = new WriterBasedJsonGenerator(ctxt,
_generatorFeatures, _objectCodec, out, _quoteChar);
if (_maximumNonEscapedChar > 0) {
gen.setHighestNonEscapedChar(_maximumNonEscapedChar);
}
if (_characterEscapes != null) {
gen.setCharacterEscapes(_characterEscapes);
}
SerializableString rootSep = _rootValueSeparator;
if (rootSep != DEFAULT_ROOT_VALUE_SEPARATOR) {
gen.setRootValueSeparator(rootSep);
}
return gen;
}
/**
* Overridable factory method that actually instantiates generator for
* given {@link OutputStream} and context object, using UTF-8 encoding.
*
* This method is specifically designed to remain
* compatible between minor versions so that sub-classes can count
* on it being called as expected. That is, it is part of official
* interface from sub-class perspective, although not a public
* method available to users of factory implementations.
*/
protected JsonGenerator _createUTF8Generator(OutputStream out, IOContext ctxt) throws IOException {
UTF8JsonGenerator gen = new UTF8JsonGenerator(ctxt,
_generatorFeatures, _objectCodec, out, _quoteChar);
if (_maximumNonEscapedChar > 0) {
gen.setHighestNonEscapedChar(_maximumNonEscapedChar);
}
if (_characterEscapes != null) {
gen.setCharacterEscapes(_characterEscapes);
}
SerializableString rootSep = _rootValueSeparator;
if (rootSep != DEFAULT_ROOT_VALUE_SEPARATOR) {
gen.setRootValueSeparator(rootSep);
}
return gen;
}
protected Writer _createWriter(OutputStream out, JsonEncoding enc, IOContext ctxt) throws IOException
{
// note: this should not get called any more (caller checks, dispatches)
if (enc == JsonEncoding.UTF8) { // We have optimized writer for UTF-8
return new UTF8Writer(ctxt, out);
}
// not optimal, but should do unless we really care about UTF-16/32 encoding speed
return new OutputStreamWriter(out, enc.getJavaName());
}
/*
/**********************************************************
/* Internal factory methods, decorator handling
/**********************************************************
*/
/**
* @since 2.4
*/
protected final InputStream _decorate(InputStream in, IOContext ctxt) throws IOException {
if (_inputDecorator != null) {
InputStream in2 = _inputDecorator.decorate(ctxt, in);
if (in2 != null) {
return in2;
}
}
return in;
}
/**
* @since 2.4
*/
protected final Reader _decorate(Reader in, IOContext ctxt) throws IOException {
if (_inputDecorator != null) {
Reader in2 = _inputDecorator.decorate(ctxt, in);
if (in2 != null) {
return in2;
}
}
return in;
}
/**
* @since 2.8
*/
protected final DataInput _decorate(DataInput in, IOContext ctxt) throws IOException {
if (_inputDecorator != null) {
DataInput in2 = _inputDecorator.decorate(ctxt, in);
if (in2 != null) {
return in2;
}
}
return in;
}
/**
* @since 2.4
*/
protected final OutputStream _decorate(OutputStream out, IOContext ctxt) throws IOException {
if (_outputDecorator != null) {
OutputStream out2 = _outputDecorator.decorate(ctxt, out);
if (out2 != null) {
return out2;
}
}
return out;
}
/**
* @since 2.4
*/
protected final Writer _decorate(Writer out, IOContext ctxt) throws IOException {
if (_outputDecorator != null) {
Writer out2 = _outputDecorator.decorate(ctxt, out);
if (out2 != null) {
return out2;
}
}
return out;
}
/*
/**********************************************************
/* Internal factory methods, other
/**********************************************************
*/
/**
* Method used by factory to create buffer recycler instances
* for parsers and generators.
*
* Note: only public to give access for ObjectMapper
*/
public BufferRecycler _getBufferRecycler()
{
/* 23-Apr-2015, tatu: Let's allow disabling of buffer recycling
* scheme, for cases where it is considered harmful (possibly
* on Android, for example)
*/
if (Feature.USE_THREAD_LOCAL_FOR_BUFFER_RECYCLING.enabledIn(_factoryFeatures)) {
return BufferRecyclers.getBufferRecycler();
}
return new BufferRecycler();
}
/**
* Overridable factory method that actually instantiates desired
* context object.
*/
protected IOContext _createContext(Object srcRef, boolean resourceManaged) {
return new IOContext(_getBufferRecycler(), srcRef, resourceManaged);
}
/**
* Overridable factory method that actually instantiates desired
* context object for async (non-blocking) parsing
*
* @since 2.9.7
*/
protected IOContext _createNonBlockingContext(Object srcRef) {
// [jackson-core#479]: allow recycling for non-blocking parser again
// now that access is thread-safe
return new IOContext(_getBufferRecycler(), srcRef, false);
}
/*
/**********************************************************
/* Internal helper methods
/**********************************************************
*/
/**
* Helper method called to work around the problem of this class both defining
* general API for constructing parsers+generators AND implementing the API
* for JSON handling. Problem here is that when adding new functionality
* via factory methods, it is not possible to leave these methods abstract
* (because we are implementing them for JSON); but there is risk that
* sub-classes do not override them all (plus older version can not implement).
* So a work-around is to add a check to ensure that factory is still one
* used for JSON; and if not, make base implementation of a factory method fail.
*
* @since 2.9
*/
private final void _requireJSONFactory(String msg) {
if (!_isJSONFactory()) {
throw new UnsupportedOperationException(String.format(msg, getFormatName()));
}
}
private final boolean _isJSONFactory() {
// NOTE: since we only really care about whether this is standard JSON-backed factory,
// or its sub-class / delegated to one, no need to check for equality, identity is enough
return getFormatName() == FORMAT_NAME_JSON;
}
}