com.fasterxml.jackson.core.base

Class GeneratorBase

java.lang.Object

com.fasterxml.jackson.core.JsonGenerator

com.fasterxml.jackson.core.base.GeneratorBase

All Implemented Interfaces:

Versioned, Closeable, Flushable, AutoCloseable

Direct Known Subclasses:

JsonGeneratorImpl

public abstract class GeneratorBase
extends JsonGenerator

This base class implements part of API that a JSON generator exposes to applications, adds shared internal methods that sub-classes can use and adds some abstract methods sub-classes must implement.

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.core.JsonGenerator

JsonGenerator.Feature

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	_cfgNumbersAsStrings Flag set to indicate that implicit conversion from number to JSON String is needed (as per JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS).
protected boolean	_closed Flag that indicates whether generator is closed or not.
protected int	_features Bit flag composed of bits that indicate which JsonGenerator.Features are enabled.
protected ObjectCodec	_objectCodec
protected JsonWriteContext	_writeContext Object that keeps track of the current contextual state of the generator.
protected static int	DERIVED_FEATURES_MASK Set of feature masks related to features that need updates of other local configuration or state.
static int	SURR1_FIRST
static int	SURR1_LAST
static int	SURR2_FIRST
static int	SURR2_LAST
protected String	WRITE_BINARY
protected String	WRITE_BOOLEAN
protected String	WRITE_NULL
protected String	WRITE_NUMBER
protected String	WRITE_RAW
protected String	WRITE_STRING

Fields inherited from class com.fasterxml.jackson.core.JsonGenerator

_cfgPrettyPrinter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	GeneratorBase(int features, ObjectCodec codec)
protected	GeneratorBase(int features, ObjectCodec codec, JsonWriteContext ctxt)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	_checkStdFeatureChanges(int newFeatureFlags, int changedFeatures) Helper method called to verify changes to standard features.
protected PrettyPrinter	_constructDefaultPrettyPrinter() Overridable factory method called to instantiate an appropriate PrettyPrinter for case of "just use the default one", when useDefaultPrettyPrinter() is called.
protected int	_decodeSurrogate(int surr1, int surr2)
protected abstract void	_releaseBuffers() Method called to release any buffers generator may be holding, once generator is being closed.
protected abstract void	_verifyValueWrite(String typeMsg) Method called before trying to write a value (scalar or structured), to verify that this is legal in current output state, as well as to output separators if and as necessary.
void	close() Method called to close this generator, so that no more content can be written.
JsonGenerator	disable(JsonGenerator.Feature f) Method for disabling specified features (check JsonGenerator.Feature for list of features)
JsonGenerator	enable(JsonGenerator.Feature f) Method for enabling specified parser features: check JsonGenerator.Feature for list of available features.
abstract void	flush() Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.
ObjectCodec	getCodec() Method for accessing the object used for writing Java object as JSON content (using method JsonGenerator.writeObject(java.lang.Object)).
Object	getCurrentValue() Helper method, usually equivalent to: getOutputContext().getCurrentValue();
int	getFeatureMask() Bulk access method for getting state of all standard (non-dataformat-specific) JsonGenerator.Features.
JsonStreamContext	getOutputContext() Note: type was co-variant until Jackson 2.7; reverted back to base type in 2.8 to allow for overriding by subtypes that use custom context type.
boolean	isClosed() Method that can be called to determine whether this generator is closed or not.
boolean	isEnabled(JsonGenerator.Feature f) Method for checking whether given feature is enabled.
JsonGenerator	overrideStdFeatures(int values, int mask) Bulk set method for (re)setting states of features specified by mask.
JsonGenerator	setCodec(ObjectCodec oc) Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using method JsonGenerator.writeObject(java.lang.Object)).
void	setCurrentValue(Object v) Helper method, usually equivalent to: getOutputContext().setCurrentValue(v);
JsonGenerator	setFeatureMask(int newMask) Deprecated.
JsonGenerator	useDefaultPrettyPrinter() Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter).
Version	version() Implemented with standard version number detection algorithm, typically using a simple generated class, with information extracted from Maven project file during build.
int	writeBinary(Base64Variant b64variant, InputStream data, int dataLength) Method similar to JsonGenerator.writeBinary(Base64Variant,byte[],int,int), but where input is provided through a stream, allowing for incremental writes without holding the whole input in memory.
void	writeFieldName(SerializableString name) Method similar to JsonGenerator.writeFieldName(String), main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.
void	writeObject(Object value) Method for writing given Java object (POJO) as Json.
void	writeRawValue(char[] text, int offset, int len)
void	writeRawValue(SerializableString text) Method similar to JsonGenerator.writeRawValue(String), but potentially more efficient as it may be able to use pre-encoded content (similar to JsonGenerator.writeRaw(SerializableString).
void	writeRawValue(String text) Method that will force generator to copy input text verbatim without any modifications, but assuming it must constitute a single legal JSON value (number, string, boolean, null, Array or List).
void	writeRawValue(String text, int offset, int len)
void	writeStartObject(Object forValue) Method for writing starting marker of a JSON Object value (character '{'; plus possible white space decoration if pretty-printing is enabled), to represent Java given as the argument.
void	writeString(SerializableString text) Method similar to JsonGenerator.writeString(String), but that takes SerializableString which can make this potentially more efficient to call as generator may be able to reuse quoted and/or encoded representation.
void	writeTree(TreeNode rootNode) Method for writing given JSON tree (expressed as a tree where given JsonNode is the root) using this generator.

Methods inherited from class com.fasterxml.jackson.core.JsonGenerator

_reportError, _reportUnsupportedOperation, _throwInternal, _verifyOffsets, _writeSimpleObject, canOmitFields, canUseSchema, canWriteBinaryNatively, canWriteFormattedNumbers, canWriteObjectId, canWriteTypeId, configure, copyCurrentEvent, copyCurrentStructure, getCharacterEscapes, getFormatFeatures, getHighestEscapedChar, getOutputBuffered, getOutputTarget, getPrettyPrinter, getSchema, overrideFormatFeatures, setCharacterEscapes, setHighestNonEscapedChar, setPrettyPrinter, setRootValueSeparator, setSchema, writeArray, writeArray, writeArray, writeArrayFieldStart, writeBinary, writeBinary, writeBinary, writeBinary, writeBinaryField, writeBoolean, writeBooleanField, writeEmbeddedObject, writeEndArray, writeEndObject, writeFieldId, writeFieldName, writeNull, writeNullField, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeObjectField, writeObjectFieldStart, writeObjectId, writeObjectRef, writeOmittedField, writeRaw, writeRaw, writeRaw, writeRaw, writeRaw, writeRawUTF8String, writeStartArray, writeStartArray, writeStartObject, writeString, writeString, writeStringField, writeTypeId, writeUTF8String

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SURR1_FIRST

public static final int SURR1_FIRST

See Also:

Constant Field Values

SURR1_LAST

public static final int SURR1_LAST

See Also:

Constant Field Values

SURR2_FIRST

public static final int SURR2_FIRST

See Also:

Constant Field Values

SURR2_LAST

public static final int SURR2_LAST

See Also:

Constant Field Values

DERIVED_FEATURES_MASK

protected static final int DERIVED_FEATURES_MASK

Set of feature masks related to features that need updates of other local configuration or state.

Since:

2.5

WRITE_BINARY

protected final String WRITE_BINARY

See Also:

Constant Field Values

WRITE_BOOLEAN

protected final String WRITE_BOOLEAN

See Also:

Constant Field Values

WRITE_NULL

protected final String WRITE_NULL

See Also:

Constant Field Values

WRITE_NUMBER

protected final String WRITE_NUMBER

See Also:

Constant Field Values

WRITE_RAW

protected final String WRITE_RAW

See Also:

Constant Field Values

WRITE_STRING

protected final String WRITE_STRING

See Also:

Constant Field Values

_objectCodec

protected ObjectCodec _objectCodec

_features

protected int _features

Bit flag composed of bits that indicate which JsonGenerator.Features are enabled.

_cfgNumbersAsStrings

protected boolean _cfgNumbersAsStrings

Flag set to indicate that implicit conversion from number to JSON String is needed (as per JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS).

_writeContext

protected JsonWriteContext _writeContext

Object that keeps track of the current contextual state of the generator.

_closed

protected boolean _closed

Flag that indicates whether generator is closed or not. Gets set when it is closed by an explicit call (close()).

Constructor Detail

GeneratorBase

protected GeneratorBase(int features,
             ObjectCodec codec)

GeneratorBase

protected GeneratorBase(int features,
             ObjectCodec codec,
             JsonWriteContext ctxt)

Since:

2.5

Method Detail

version

public Version version()

Implemented with standard version number detection algorithm, typically using a simple generated class, with information extracted from Maven project file during build.

Specified by:

version in interface Versioned

Specified by:

version in class JsonGenerator

getCurrentValue

public Object getCurrentValue()

Description copied from class: JsonGenerator

Helper method, usually equivalent to: getOutputContext().getCurrentValue();

Note that "current value" is NOT populated (or used) by Streaming parser; it is only used by higher-level data-binding functionality. The reason it is included here is that it can be stored and accessed hierarchically, and gets passed through data-binding.

Overrides:

getCurrentValue in class JsonGenerator

setCurrentValue

public void setCurrentValue(Object v)

Description copied from class: JsonGenerator

Helper method, usually equivalent to: getOutputContext().setCurrentValue(v);

Overrides:

setCurrentValue in class JsonGenerator

isEnabled

public final boolean isEnabled(JsonGenerator.Feature f)

Description copied from class: JsonGenerator

Method for checking whether given feature is enabled. Check JsonGenerator.Feature for list of available features.

Specified by:

isEnabled in class JsonGenerator

getFeatureMask

public int getFeatureMask()

Description copied from class: JsonGenerator

Bulk access method for getting state of all standard (non-dataformat-specific) JsonGenerator.Features.

Specified by:

getFeatureMask in class JsonGenerator

Returns:

Bit mask that defines current states of all standard JsonGenerator.Features.

enable

public JsonGenerator enable(JsonGenerator.Feature f)

Description copied from class: JsonGenerator

Method for enabling specified parser features: check JsonGenerator.Feature for list of available features.

Specified by:

enable in class JsonGenerator

Returns:

Generator itself (this), to allow chaining

disable

public JsonGenerator disable(JsonGenerator.Feature f)

Description copied from class: JsonGenerator

Method for disabling specified features (check JsonGenerator.Feature for list of features)

Specified by:

disable in class JsonGenerator

Returns:

Generator itself (this), to allow chaining

setFeatureMask

@Deprecated
public JsonGenerator setFeatureMask(int newMask)

Deprecated.

Description copied from class: JsonGenerator

Bulk set method for (re)setting states of all standard JsonGenerator.Features

Specified by:

setFeatureMask in class JsonGenerator

Parameters:

newMask - Bitmask that defines which JsonGenerator.Features are enabled and which disabled

Returns:

This parser object, to allow chaining of calls

overrideStdFeatures

public JsonGenerator overrideStdFeatures(int values,
                                int mask)

Description copied from class: JsonGenerator

Bulk set method for (re)setting states of features specified by mask. Functionally equivalent to int oldState = getFeatureMask(); int newState = (oldState & ~mask) | (values & mask); setFeatureMask(newState); but preferred as this lets caller more efficiently specify actual changes made.

Overrides:

overrideStdFeatures in class JsonGenerator

Parameters:

values - Bit mask of set/clear state for features to change

mask - Bit mask of features to change

_checkStdFeatureChanges

protected void _checkStdFeatureChanges(int newFeatureFlags,
                           int changedFeatures)

Helper method called to verify changes to standard features.

Parameters:

newFeatureFlags - Bitflag of standard features after they were changed

changedFeatures - Bitflag of standard features for which setting did change

Since:

2.7

useDefaultPrettyPrinter

public JsonGenerator useDefaultPrettyPrinter()

Description copied from class: JsonGenerator

Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter).

Specified by:

useDefaultPrettyPrinter in class JsonGenerator

Returns:

Generator itself (this), to allow chaining

setCodec

public JsonGenerator setCodec(ObjectCodec oc)

Description copied from class: JsonGenerator

Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using method JsonGenerator.writeObject(java.lang.Object)).

Specified by:

setCodec in class JsonGenerator

Returns:

Generator itself (this), to allow chaining

getCodec

public ObjectCodec getCodec()

Description copied from class: JsonGenerator

Method for accessing the object used for writing Java object as JSON content (using method JsonGenerator.writeObject(java.lang.Object)).

Specified by:

getCodec in class JsonGenerator

getOutputContext

public JsonStreamContext getOutputContext()

Note: type was co-variant until Jackson 2.7; reverted back to base type in 2.8 to allow for overriding by subtypes that use custom context type.

Specified by:

getOutputContext in class JsonGenerator

Returns:

Context object that can give information about logical position within generated json content.

writeStartObject

public void writeStartObject(Object forValue)
                      throws IOException

Description copied from class: JsonGenerator

Method for writing starting marker of a JSON Object value (character '{'; plus possible white space decoration if pretty-printing is enabled), to represent Java given as the argument. Argument is offered as metadata, but more importantly it should be assigned as the "current value" for the Object content that gets constructed and initialized.

Object values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.

Overrides:

writeStartObject in class JsonGenerator

Throws:

IOException

writeFieldName

public void writeFieldName(SerializableString name)
                    throws IOException

Description copied from class: JsonGenerator

Method similar to JsonGenerator.writeFieldName(String), main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.

Default implementation simple uses unprocessed name container in serialized String; implementations are strongly encouraged to make use of more efficient methods argument object has.

Specified by:

writeFieldName in class JsonGenerator

Throws:

IOException

writeString

public void writeString(SerializableString text)
                 throws IOException

Description copied from class: JsonGenerator

Method similar to JsonGenerator.writeString(String), but that takes SerializableString which can make this potentially more efficient to call as generator may be able to reuse quoted and/or encoded representation.

Default implementation just calls JsonGenerator.writeString(String); sub-classes should override it with more efficient implementation if possible.

Specified by:

writeString in class JsonGenerator

Throws:

IOException

writeRawValue

public void writeRawValue(String text)
                   throws IOException

Description copied from class: JsonGenerator

Method that will force generator to copy input text verbatim without any modifications, but assuming it must constitute a single legal JSON value (number, string, boolean, null, Array or List). Assuming this, proper separators are added if and as needed (comma or colon), and generator state updated to reflect this.

Specified by:

writeRawValue in class JsonGenerator

Throws:

IOException

writeRawValue

public void writeRawValue(String text,
                 int offset,
                 int len)
                   throws IOException

Specified by:

writeRawValue in class JsonGenerator

Throws:

IOException

writeRawValue

public void writeRawValue(char[] text,
                 int offset,
                 int len)
                   throws IOException

Specified by:

writeRawValue in class JsonGenerator

Throws:

IOException

writeRawValue

public void writeRawValue(SerializableString text)
                   throws IOException

Description copied from class: JsonGenerator

Method similar to JsonGenerator.writeRawValue(String), but potentially more efficient as it may be able to use pre-encoded content (similar to JsonGenerator.writeRaw(SerializableString).

Overrides:

writeRawValue in class JsonGenerator

Throws:

IOException

writeBinary

public int writeBinary(Base64Variant b64variant,
              InputStream data,
              int dataLength)
                throws IOException

Description copied from class: JsonGenerator

Method similar to JsonGenerator.writeBinary(Base64Variant,byte[],int,int), but where input is provided through a stream, allowing for incremental writes without holding the whole input in memory.

Specified by:

writeBinary in class JsonGenerator

Parameters:

b64variant - Base64 variant to use

data - InputStream to use for reading binary data to write. Will not be closed after successful write operation

dataLength - (optional) number of bytes that will be available; or -1 to be indicate it is not known. If a positive length is given, data MUST provide at least that many bytes: if not, an exception will be thrown. Note that implementations need not support cases where length is not known in advance; this depends on underlying data format: JSON output does NOT require length, other formats may.

Returns:

Number of bytes read from data and written as binary payload

Throws:

IOException

writeObject

public void writeObject(Object value)
                 throws IOException

Description copied from class: JsonGenerator

Method for writing given Java object (POJO) as Json. Exactly how the object gets written depends on object in question (ad on codec, its configuration); for most beans it will result in JSON Object, but for others JSON Array, or String or numeric value (and for nulls, JSON null literal. NOTE: generator must have its object codec set to non-null value; for generators created by a mapping factory this is the case, for others not.

Specified by:

writeObject in class JsonGenerator

Throws:

IOException

writeTree

public void writeTree(TreeNode rootNode)
               throws IOException

Description copied from class: JsonGenerator

Method for writing given JSON tree (expressed as a tree where given JsonNode is the root) using this generator. This will generally just call JsonGenerator.writeObject(java.lang.Object) with given node, but is added for convenience and to make code more explicit in cases where it deals specifically with trees.

Specified by:

writeTree in class JsonGenerator

Throws:

IOException

flush

public abstract void flush()
                    throws IOException

Description copied from class: JsonGenerator

Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.

Specified by:

flush in interface Flushable

Specified by:

flush in class JsonGenerator

Throws:

IOException

close

public void close()
           throws IOException

Description copied from class: JsonGenerator

Method called to close this generator, so that no more content can be written.

Whether the underlying target (stream, writer) gets closed depends on whether this generator either manages the target (i.e. is the only one with access to the target -- case if caller passes a reference to the resource such as File, but not stream); or has feature JsonGenerator.Feature.AUTO_CLOSE_TARGET enabled. If either of above is true, the target is also closed. Otherwise (not managing, feature not enabled), target is not closed.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class JsonGenerator

Throws:

IOException

isClosed

public boolean isClosed()

Description copied from class: JsonGenerator

Method that can be called to determine whether this generator is closed or not. If it is closed, no more output can be done.

Specified by:

isClosed in class JsonGenerator

_releaseBuffers

protected abstract void _releaseBuffers()

Method called to release any buffers generator may be holding, once generator is being closed.

_verifyValueWrite

protected abstract void _verifyValueWrite(String typeMsg)
                                   throws IOException

Method called before trying to write a value (scalar or structured), to verify that this is legal in current output state, as well as to output separators if and as necessary.

Parameters:

typeMsg - Additional message used for generating exception message if value output is NOT legal in current generator output state.

Throws:

IOException

_constructDefaultPrettyPrinter

protected PrettyPrinter _constructDefaultPrettyPrinter()

Overridable factory method called to instantiate an appropriate PrettyPrinter for case of "just use the default one", when useDefaultPrettyPrinter() is called.

Since:

2.6

_decodeSurrogate

protected final int _decodeSurrogate(int surr1,
                   int surr2)
                              throws IOException

Throws:

IOException

Since:

2.5