public final class WriterBasedJsonGenerator extends JsonGeneratorImpl
JsonGenerator that outputs JSON content using a Writer
which handles character encoding.JsonGenerator.Feature| Modifier and Type | Field and Description |
|---|---|
protected SerializableString |
_currentEscape
When custom escapes are used, this member variable is used
internally to hold a reference to currently used escape
|
protected char[] |
_entityBuffer
Short (14 char) temporary buffer allocated if needed, for constructing
escape sequences
|
protected char[] |
_outputBuffer
Intermediate buffer in which contents are buffered before
being written using
_writer. |
protected int |
_outputEnd
End marker of the output buffer; one past the last valid position
within the buffer.
|
protected int |
_outputHead
Pointer to the first buffered character to output
|
protected int |
_outputTail
Pointer to the position right beyond the last character to output
(end marker; may point to position right beyond the end of the buffer)
|
protected char |
_quoteChar
Character used for quoting JSON Object property names
and String values.
|
protected Writer |
_writer |
protected static char[] |
HEX_CHARS |
protected static int |
SHORT_WRITE |
_cfgUnqNames, _characterEscapes, _ioContext, _maximumNonEscapedChar, _outputEscapes, _rootValueSeparator, sOutputEscapes_cfgNumbersAsStrings, _closed, _features, _objectCodec, _writeContext, DERIVED_FEATURES_MASK, SURR1_FIRST, SURR1_LAST, SURR2_FIRST, SURR2_LAST, WRITE_BINARY, WRITE_BOOLEAN, WRITE_NULL, WRITE_NUMBER, WRITE_RAW, WRITE_STRING_cfgPrettyPrinter| Constructor and Description |
|---|
WriterBasedJsonGenerator(IOContext ctxt,
int features,
ObjectCodec codec,
Writer w) |
| Modifier and Type | Method and Description |
|---|---|
protected void |
_flushBuffer() |
protected void |
_releaseBuffers()
Method called to release any buffers generator may be holding,
once generator is being closed.
|
protected void |
_verifyPrettyValueWrite(String typeMsg) |
protected 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.
|
protected void |
_writeBinary(Base64Variant b64variant,
byte[] input,
int inputPtr,
int inputEnd) |
protected int |
_writeBinary(Base64Variant b64variant,
InputStream data,
byte[] readBuffer) |
protected int |
_writeBinary(Base64Variant b64variant,
InputStream data,
byte[] readBuffer,
int bytesLeft) |
protected void |
_writeFieldName(SerializableString name,
boolean commaBefore) |
protected void |
_writeFieldName(String name,
boolean commaBefore) |
protected void |
_writePPFieldName(SerializableString name,
boolean commaBefore) |
protected void |
_writePPFieldName(String name,
boolean commaBefore)
Specialized version of
_writeFieldName, off-lined
to keep the "fast path" as simple (and hopefully fast) as possible. |
boolean |
canWriteFormattedNumbers()
Introspection method to call to check whether it is possible
to write numbers using
JsonGenerator.writeNumber(java.lang.String)
using possible custom format, or not. |
void |
close()
Method called to close this generator, so that no more content
can be written.
|
void |
flush()
Method called to flush any buffered content to the underlying
target (output stream, writer), and to flush the target itself
as well.
|
int |
getOutputBuffered()
Method for verifying amount of content that is buffered by generator
but not yet flushed to the underlying target (stream, writer),
in units (byte, char) that the generator implementation uses for buffering;
or -1 if this information is not available.
|
Object |
getOutputTarget()
Method that can be used to get access to object that is used
as target for generated output; this is usually either
OutputStream or Writer, depending on what
generator was constructed with. |
void |
writeBinary(Base64Variant b64variant,
byte[] data,
int offset,
int len)
Method that will output given chunk of binary data as base64
encoded, as a complete String value (surrounded by double quotes).
|
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 |
writeBoolean(boolean state)
Method for outputting literal JSON boolean value (one of
Strings 'true' and 'false').
|
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 |
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 |
writeFieldName(String name)
Method for writing a field name (JSON String surrounded by
double quotes: syntactically identical to a JSON String value),
possibly decorated by white space if pretty-printing is enabled.
|
void |
writeNull()
Method for outputting literal JSON null value.
|
void |
writeNumber(BigDecimal value)
Method for outputting indicate JSON numeric value.
|
void |
writeNumber(BigInteger value)
Method for outputting given value as JSON number.
|
void |
writeNumber(double d)
Method for outputting indicate JSON numeric value.
|
void |
writeNumber(float f)
Method for outputting indicate JSON numeric value.
|
void |
writeNumber(int i)
Method for outputting given value as JSON number.
|
void |
writeNumber(long l)
Method for outputting given value as JSON number.
|
void |
writeNumber(short s)
Method for outputting given value as JSON number.
|
void |
writeNumber(String encodedValue)
Write method that can be used for custom numeric types that can
not be (easily?) converted to "standard" Java number types.
|
void |
writeRaw(char c)
Method that will force generator to copy
input text verbatim with no modifications (including
that no escaping is done and no separators are added even
if context [array, object] would otherwise require such).
|
void |
writeRaw(char[] text,
int offset,
int len)
Method that will force generator to copy
input text verbatim with no modifications (including
that no escaping is done and no separators are added even
if context [array, object] would otherwise require such).
|
void |
writeRaw(SerializableString text)
Method that will force generator to copy
input text verbatim with no modifications (including
that no escaping is done and no separators are added even
if context [array, object] would otherwise require such).
|
void |
writeRaw(String text)
Method that will force generator to copy
input text verbatim with no modifications (including
that no escaping is done and no separators are added even
if context [array, object] would otherwise require such).
|
void |
writeRaw(String text,
int start,
int len)
Method that will force generator to copy
input text verbatim with no modifications (including
that no escaping is done and no separators are added even
if context [array, object] would otherwise require such).
|
void |
writeRawUTF8String(byte[] text,
int offset,
int length)
Method similar to
JsonGenerator.writeString(String) but that takes as
its input a UTF-8 encoded String that is to be output as-is, without additional
escaping (type of which depends on data format; backslashes for JSON). |
void |
writeStartArray()
Method for writing starting marker of a Array value
(for JSON this is 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 |
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(char[] text,
int offset,
int len)
Method for outputting a String value.
|
void |
writeString(SerializableString sstr)
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 |
writeString(String text)
Method for outputting a String value.
|
void |
writeUTF8String(byte[] text,
int offset,
int length)
Method similar to
JsonGenerator.writeString(String) but that takes as its input
a UTF-8 encoded String which has not been escaped using whatever
escaping scheme data format requires (for JSON that is backslash-escaping
for control characters and double-quotes; for other formats something else). |
_checkStdFeatureChanges, disable, enable, getCharacterEscapes, getHighestEscapedChar, setCharacterEscapes, setHighestNonEscapedChar, setRootValueSeparator, version, writeStringField_constructDefaultPrettyPrinter, _decodeSurrogate, getCodec, getCurrentValue, getFeatureMask, getOutputContext, isClosed, isEnabled, overrideStdFeatures, setCodec, setCurrentValue, setFeatureMask, useDefaultPrettyPrinter, writeObject, writeRawValue, writeRawValue, writeRawValue, writeRawValue, writeTree_reportError, _reportUnsupportedOperation, _throwInternal, _verifyOffsets, _writeSimpleObject, canOmitFields, canUseSchema, canWriteBinaryNatively, canWriteObjectId, canWriteTypeId, configure, copyCurrentEvent, copyCurrentStructure, getFormatFeatures, getPrettyPrinter, getSchema, overrideFormatFeatures, setPrettyPrinter, setSchema, writeArray, writeArray, writeArray, writeArrayFieldStart, writeBinary, writeBinary, writeBinary, writeBinaryField, writeBooleanField, writeEmbeddedObject, writeFieldId, writeNullField, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeObjectField, writeObjectFieldStart, writeObjectId, writeObjectRef, writeOmittedField, writeStartArray, writeTypeIdprotected static final int SHORT_WRITE
protected static final char[] HEX_CHARS
protected final Writer _writer
protected char _quoteChar
protected char[] _outputBuffer
_writer.protected int _outputHead
protected int _outputTail
protected int _outputEnd
protected char[] _entityBuffer
protected SerializableString _currentEscape
public WriterBasedJsonGenerator(IOContext ctxt, int features, ObjectCodec codec, Writer w)
public Object getOutputTarget()
JsonGeneratorOutputStream or Writer, depending on what
generator was constructed with.
Note that returned value may be null in some cases; including
case where implementation does not want to exposed raw
source to caller.
In cases where output has been decorated, object returned here
is the decorated version; this allows some level of interaction
between users of generator and decorator object.
In general use of this accessor should be considered as "last effort", i.e. only used if no other mechanism is applicable.
getOutputTarget in class JsonGeneratorpublic int getOutputBuffered()
JsonGeneratorOutputStream, `char` for Writer),
but may differ if buffering is done before encoding.
Default JSON-backed implementations do use matching units.
Note: non-JSON implementations will be retrofitted for 2.6 and beyond; please report if you see -1 (missing override)
getOutputBuffered in class JsonGeneratorpublic boolean canWriteFormattedNumbers()
JsonGeneratorJsonGenerator.writeNumber(java.lang.String)
using possible custom format, or not. Typically textual formats
allow this (and JSON specifically does), whereas binary formats
do not allow this (except by writing them as Strings).
Usual reason for calling this method is to check whether custom
formatting of numbers may be applied by higher-level code (databinding)
or not.canWriteFormattedNumbers in class JsonGeneratorpublic void writeFieldName(String name) throws IOException
JsonGeneratorField names can only be written in Object context (check out JSON specification for details), when field name is expected (field names alternate with values).
writeFieldName in class JsonGeneratorIOExceptionpublic void writeFieldName(SerializableString name) throws IOException
JsonGeneratorJsonGenerator.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.
writeFieldName in class GeneratorBaseIOExceptionprotected void _writeFieldName(String name, boolean commaBefore) throws IOException
IOExceptionprotected void _writeFieldName(SerializableString name, boolean commaBefore) throws IOException
IOExceptionpublic void writeStartArray()
throws IOException
JsonGeneratorArray values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.
writeStartArray in class JsonGeneratorIOExceptionpublic void writeEndArray()
throws IOException
JsonGeneratorMarker can be written if the innermost structured type is Array.
writeEndArray in class JsonGeneratorIOExceptionpublic void writeStartObject(Object forValue) throws IOException
JsonGeneratorObject values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.
writeStartObject in class GeneratorBaseIOExceptionpublic void writeStartObject()
throws IOException
JsonGeneratorObject values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.
writeStartObject in class JsonGeneratorIOExceptionpublic void writeEndObject()
throws IOException
JsonGeneratorMarker 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).
writeEndObject in class JsonGeneratorIOExceptionprotected void _writePPFieldName(String name, boolean commaBefore) throws IOException
_writeFieldName, off-lined
to keep the "fast path" as simple (and hopefully fast) as possible.IOExceptionprotected void _writePPFieldName(SerializableString name, boolean commaBefore) throws IOException
IOExceptionpublic void writeString(String text) throws IOException
JsonGeneratorwriteString in class JsonGeneratorIOExceptionpublic void writeString(char[] text,
int offset,
int len)
throws IOException
JsonGeneratorwriteString in class JsonGeneratorIOExceptionpublic void writeString(SerializableString sstr) throws IOException
JsonGeneratorJsonGenerator.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.
writeString in class GeneratorBaseIOExceptionpublic void writeRawUTF8String(byte[] text,
int offset,
int length)
throws IOException
JsonGeneratorJsonGenerator.writeString(String) but that takes as
its input a UTF-8 encoded String that is to be output as-is, without additional
escaping (type of which depends on data format; backslashes for JSON).
However, quoting that data format requires (like double-quotes for JSON) will be added
around the value if and as necessary.
Note that some backends may choose not to support this method: for
example, if underlying destination is a Writer
using this method would require UTF-8 decoding.
If so, implementation may instead choose to throw a
UnsupportedOperationException due to ineffectiveness
of having to decode input.
writeRawUTF8String in class JsonGeneratorIOExceptionpublic void writeUTF8String(byte[] text,
int offset,
int length)
throws IOException
JsonGeneratorJsonGenerator.writeString(String) but that takes as its input
a UTF-8 encoded String which has not been escaped using whatever
escaping scheme data format requires (for JSON that is backslash-escaping
for control characters and double-quotes; for other formats something else).
This means that textual JSON backends need to check if value needs
JSON escaping, but otherwise can just be copied as is to output.
Also, quoting that data format requires (like double-quotes for JSON) will be added
around the value if and as necessary.
Note that some backends may choose not to support this method: for
example, if underlying destination is a Writer
using this method would require UTF-8 decoding.
In this case
generator implementation may instead choose to throw a
UnsupportedOperationException due to ineffectiveness
of having to decode input.
writeUTF8String in class JsonGeneratorIOExceptionpublic void writeRaw(String text) throws IOException
JsonGeneratorJsonGenerator.writeRawValue(String) instead.
Note that not all generator implementations necessarily support
such by-pass methods: those that do not will throw
UnsupportedOperationException.
writeRaw in class JsonGeneratorIOExceptionpublic void writeRaw(String text, int start, int len) throws IOException
JsonGeneratorJsonGenerator.writeRawValue(String) instead.
Note that not all generator implementations necessarily support
such by-pass methods: those that do not will throw
UnsupportedOperationException.
writeRaw in class JsonGeneratorIOExceptionpublic void writeRaw(SerializableString text) throws IOException
JsonGeneratorJsonGenerator.writeRawValue(String) instead.
Note that not all generator implementations necessarily support
such by-pass methods: those that do not will throw
UnsupportedOperationException.
The default implementation delegates to JsonGenerator.writeRaw(String);
other backends that support raw inclusion of text are encouraged
to implement it in more efficient manner (especially if they
use UTF-8 encoding).
writeRaw in class JsonGeneratorIOExceptionpublic void writeRaw(char[] text,
int offset,
int len)
throws IOException
JsonGeneratorJsonGenerator.writeRawValue(String) instead.
Note that not all generator implementations necessarily support
such by-pass methods: those that do not will throw
UnsupportedOperationException.
writeRaw in class JsonGeneratorIOExceptionpublic void writeRaw(char c)
throws IOException
JsonGeneratorJsonGenerator.writeRawValue(String) instead.
Note that not all generator implementations necessarily support
such by-pass methods: those that do not will throw
UnsupportedOperationException.
writeRaw in class JsonGeneratorIOExceptionpublic void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len) throws IOException, JsonGenerationException
JsonGenerator
Note: because JSON Strings can not contain unescaped linefeeds,
if linefeeds are included (as per last argument), they must be
escaped. This adds overhead for decoding without improving
readability.
Alternatively if linefeeds are not included,
resulting String value may violate the requirement of base64
RFC which mandates line-length of 76 characters and use of
linefeeds. However, all JsonParser implementations
are required to accept such "long line base64"; as do
typical production-level base64 decoders.
writeBinary in class JsonGeneratorb64variant - Base64 variant to use: defines details such as
whether padding is used (and if so, using which character);
what is the maximum line length before adding linefeed,
and also the underlying alphabet to use.IOExceptionJsonGenerationExceptionpublic int writeBinary(Base64Variant b64variant, InputStream data, int dataLength) throws IOException, JsonGenerationException
JsonGeneratorJsonGenerator.writeBinary(Base64Variant,byte[],int,int),
but where input is provided through a stream, allowing for incremental
writes without holding the whole input in memory.writeBinary in class GeneratorBaseb64variant - Base64 variant to usedata - InputStream to use for reading binary data to write.
Will not be closed after successful write operationdataLength - (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.data and written as binary payloadIOExceptionJsonGenerationExceptionpublic void writeNumber(short s)
throws IOException
JsonGeneratorwriteNumber in class JsonGenerators - Number value to writeIOExceptionpublic void writeNumber(int i)
throws IOException
JsonGeneratorwriteNumber in class JsonGeneratori - Number value to writeIOExceptionpublic void writeNumber(long l)
throws IOException
JsonGeneratorwriteNumber in class JsonGeneratorl - Number value to writeIOExceptionpublic void writeNumber(BigInteger value) throws IOException
JsonGeneratorwriteNumber in class JsonGeneratorvalue - Number value to writeIOExceptionpublic void writeNumber(double d)
throws IOException
JsonGeneratorwriteNumber in class JsonGeneratord - Number value to writeIOExceptionpublic void writeNumber(float f)
throws IOException
JsonGeneratorwriteNumber in class JsonGeneratorf - Number value to writeIOExceptionpublic void writeNumber(BigDecimal value) throws IOException
JsonGeneratorwriteNumber in class JsonGeneratorvalue - Number value to writeIOExceptionpublic void writeNumber(String encodedValue) throws IOException
JsonGeneratorJsonGenerator.writeString(java.lang.String) method can not be used; nor
JsonGenerator.writeRaw(java.lang.String) because that does not properly handle
value separators needed in Array or Object contexts.
Note: because of lack of type safety, some generator
implementations may not be able to implement this
method. For example, if a binary JSON format is used,
it may require type information for encoding; similarly
for generator-wrappers around Java objects or JSON nodes.
If implementation does not implement this method,
it needs to throw UnsupportedOperationException.
writeNumber in class JsonGeneratorIOExceptionpublic void writeBoolean(boolean state)
throws IOException
JsonGeneratorwriteBoolean in class JsonGeneratorIOExceptionpublic void writeNull()
throws IOException
JsonGeneratorwriteNull in class JsonGeneratorIOExceptionprotected void _verifyValueWrite(String typeMsg) throws IOException
GeneratorBase_verifyValueWrite in class GeneratorBasetypeMsg - Additional message used for generating exception message
if value output is NOT legal in current generator output state.IOExceptionprotected void _verifyPrettyValueWrite(String typeMsg) throws IOException
IOExceptionpublic void flush()
throws IOException
JsonGeneratorflush in interface Flushableflush in class GeneratorBaseIOExceptionpublic void close()
throws IOException
JsonGenerator
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.
close in interface Closeableclose in interface AutoCloseableclose in class GeneratorBaseIOExceptionprotected void _releaseBuffers()
GeneratorBase_releaseBuffers in class GeneratorBaseprotected void _writeBinary(Base64Variant b64variant, byte[] input, int inputPtr, int inputEnd) throws IOException, JsonGenerationException
IOExceptionJsonGenerationExceptionprotected int _writeBinary(Base64Variant b64variant, InputStream data, byte[] readBuffer, int bytesLeft) throws IOException, JsonGenerationException
IOExceptionJsonGenerationExceptionprotected int _writeBinary(Base64Variant b64variant, InputStream data, byte[] readBuffer) throws IOException, JsonGenerationException
IOExceptionJsonGenerationExceptionprotected void _flushBuffer()
throws IOException
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