org.codehaus.jackson.impl

Class JsonGeneratorBase

java.lang.Object

org.codehaus.jackson.JsonGenerator

org.codehaus.jackson.impl.JsonGeneratorBase

All Implemented Interfaces:

Closeable, AutoCloseable, Versioned

Direct Known Subclasses:

SmileGenerator, Utf8Generator, WriterBasedGenerator

public abstract class JsonGeneratorBase
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 org.codehaus.jackson.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.

Fields inherited from class org.codehaus.jackson.JsonGenerator

_cfgPrettyPrinter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JsonGeneratorBase(int features, ObjectCodec codec)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	_cantHappen()
protected abstract void	_releaseBuffers()
protected void	_reportError(String msg)
protected void	_reportUnsupportedOperation()
protected void	_throwInternal()
protected abstract void	_verifyValueWrite(String typeMsg)
protected void	_writeEndArray() Deprecated. since 1.7, should just override writeEndArray() instead of defining this method
protected void	_writeEndObject() Deprecated. since 1.7, should just override writeEndObject() instead of defining this method
protected void	_writeSimpleObject(Object value) Helper method to try to call appropriate write method for given untyped Object.
protected void	_writeStartArray() Deprecated. since 1.7, should just override writeStartArray() instead of defining this method
protected void	_writeStartObject() Deprecated. since 1.7, should just override writeStartObject() instead of defining this method
void	close() Method called to close this generator, so that no more content can be written.
void	copyCurrentEvent(JsonParser jp) Method for copying contents of the current event that the given parser instance points to.
void	copyCurrentStructure(JsonParser jp) Method for copying contents of the current event and following events that it encloses the given parser instance points to.
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)).
JsonWriteContext	getOutputContext() Note: co-variant return 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	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)).
JsonGenerator	useDefaultPrettyPrinter() Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter).
Version	version() Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (see Version for details).
void	writeEndArray() Method for writing closing marker of a JSON Array value (character ']'; plus possible white space decoration if pretty-printing is enabled).
void	writeEndObject() Method for writing closing marker of a JSON Object value (character '}'; plus possible white space decoration if pretty-printing is enabled).
void	writeObject(Object value) Method for writing given Java object (POJO) as Json.
void	writeRawValue(char[] text, int offset, int len)
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	writeStartArray() Method for writing starting marker of a JSON Array value (character '['; plus possible white space decoration if pretty-printing is enabled).
void	writeStartObject() Method for writing starting marker of a JSON Object value (character '{'; plus possible white space decoration if pretty-printing is enabled).
void	writeTree(JsonNode rootNode) Method for writing given JSON tree (expressed as a tree where given JsonNode is the root) using this generator.

Methods inherited from class org.codehaus.jackson.JsonGenerator

canUseSchema, configure, disableFeature, enableFeature, getCharacterEscapes, getHighestEscapedChar, getOutputTarget, isFeatureEnabled, setCharacterEscapes, setFeature, setHighestNonEscapedChar, setPrettyPrinter, setSchema, writeArrayFieldStart, writeBinary, writeBinary, writeBinary, writeBinaryField, writeBoolean, writeBooleanField, writeFieldName, writeFieldName, writeFieldName, writeNull, writeNullField, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumber, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeObjectField, writeObjectFieldStart, writeRaw, writeRaw, writeRaw, writeRaw, writeRawUTF8String, writeString, writeString, writeString, writeStringField, writeUTF8String

Methods inherited from class java.lang.Object

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

Field Detail

_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

JsonGeneratorBase

protected JsonGeneratorBase(int features,
                 ObjectCodec codec)

Method Detail

version

public Version version()

Description copied from interface: Versioned

Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (see Version for details).

Specified by:

version in interface Versioned

Overrides:

version in class JsonGenerator

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

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

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 final 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 final JsonWriteContext getOutputContext()

Note: co-variant return type.

Specified by:

getOutputContext in class JsonGenerator

Returns:

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

writeStartArray

public void writeStartArray()
                     throws IOException,
                            JsonGenerationException

Description copied from class: JsonGenerator

Method for writing starting marker of a JSON Array value (character '['; plus possible white space decoration if pretty-printing is enabled).

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

Specified by:

writeStartArray in class JsonGenerator

Throws:

IOException

JsonGenerationException

_writeStartArray

@Deprecated
protected void _writeStartArray()
                         throws IOException,
                                JsonGenerationException

Deprecated. since 1.7, should just override writeStartArray() instead of defining this method

Throws:

IOException

JsonGenerationException

writeEndArray

public void writeEndArray()
                   throws IOException,
                          JsonGenerationException

Description copied from class: JsonGenerator

Method for writing closing marker of a JSON Array value (character ']'; plus possible white space decoration if pretty-printing is enabled).

Marker can be written if the innermost structured type is Array.

Specified by:

writeEndArray in class JsonGenerator

Throws:

IOException

JsonGenerationException

_writeEndArray

@Deprecated
protected void _writeEndArray()
                       throws IOException,
                              JsonGenerationException

Deprecated. since 1.7, should just override writeEndArray() instead of defining this method

Throws:

IOException

JsonGenerationException

writeStartObject

public void writeStartObject()
                      throws IOException,
                             JsonGenerationException

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).

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

Specified by:

writeStartObject in class JsonGenerator

Throws:

IOException

JsonGenerationException

_writeStartObject

@Deprecated
protected void _writeStartObject()
                          throws IOException,
                                 JsonGenerationException

Deprecated. since 1.7, should just override writeStartObject() instead of defining this method

Throws:

IOException

JsonGenerationException

writeEndObject

public void writeEndObject()
                    throws IOException,
                           JsonGenerationException

Description copied from class: JsonGenerator

Method for writing closing marker of a JSON Object value (character '}'; plus possible white space decoration if pretty-printing is enabled).

Marker can be written if the innermost structured type is Object, and the last written event was either a complete value, or START-OBJECT marker (see JSON specification for more details).

Specified by:

writeEndObject in class JsonGenerator

Throws:

IOException

JsonGenerationException

_writeEndObject

@Deprecated
protected void _writeEndObject()
                        throws IOException,
                               JsonGenerationException

Deprecated. since 1.7, should just override writeEndObject() instead of defining this method

Throws:

IOException

JsonGenerationException

writeRawValue

public void writeRawValue(String text)
                   throws IOException,
                          JsonGenerationException

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

JsonGenerationException

writeRawValue

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

Specified by:

writeRawValue in class JsonGenerator

Throws:

IOException

JsonGenerationException

writeRawValue

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

Specified by:

writeRawValue in class JsonGenerator

Throws:

IOException

JsonGenerationException

writeObject

public void writeObject(Object value)
                 throws IOException,
                        JsonProcessingException

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

JsonProcessingException

writeTree

public void writeTree(JsonNode rootNode)
               throws IOException,
                      JsonProcessingException

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

JsonProcessingException

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 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

copyCurrentEvent

public final void copyCurrentEvent(JsonParser jp)
                            throws IOException,
                                   JsonProcessingException

Description copied from class: JsonGenerator

Method for copying contents of the current event that the given parser instance points to. Note that the method will not copy any other events, such as events contained within Json Array or Object structures.

Calling this method will not advance the given parser, although it may cause parser to internally process more data (if it lazy loads contents of value events, for example)

Specified by:

copyCurrentEvent in class JsonGenerator

Throws:

IOException

JsonProcessingException

copyCurrentStructure

public final void copyCurrentStructure(JsonParser jp)
                                throws IOException,
                                       JsonProcessingException

Description copied from class: JsonGenerator

Method for copying contents of the current event and following events that it encloses the given parser instance points to.

So what constitutes enclosing? Here is the list of events that have associated enclosed events that will get copied:

• JsonToken.START_OBJECT: all events up to and including matching (closing) JsonToken.END_OBJECT will be copied
• JsonToken.START_ARRAY all events up to and including matching (closing) JsonToken.END_ARRAY will be copied
• JsonToken.FIELD_NAME the logical value (which can consist of a single scalar value; or a sequence of related events for structured types (Json Arrays, Objects)) will be copied along with the name itself. So essentially the whole field entry (name and value) will be copied.

After calling this method, parser will point to the last event that was copied. This will either be the event parser already pointed to (if there were no enclosed events), or the last enclosed event copied.

Specified by:

copyCurrentStructure in class JsonGenerator

Throws:

IOException

JsonProcessingException

_releaseBuffers

protected abstract void _releaseBuffers()

_verifyValueWrite

protected abstract void _verifyValueWrite(String typeMsg)
                                   throws IOException,
                                          JsonGenerationException

Throws:

IOException

JsonGenerationException

_reportError

protected void _reportError(String msg)
                     throws JsonGenerationException

Throws:

JsonGenerationException

_cantHappen

protected void _cantHappen()

_writeSimpleObject

protected void _writeSimpleObject(Object value)
                           throws IOException,
                                  JsonGenerationException

Helper method to try to call appropriate write method for given untyped Object. At this point, no structural conversions should be done, only simple basic types are to be coerced as necessary.

Parameters:

value - Non-null value to write

Throws:

IOException

JsonGenerationException

_throwInternal

protected final void _throwInternal()

_reportUnsupportedOperation

protected void _reportUnsupportedOperation()

Since:

1.7