com.fasterxml.jackson.core.json.async

Class NonBlockingJsonParserBase

java.lang.Object

com.fasterxml.jackson.core.JsonParser

com.fasterxml.jackson.core.base.ParserMinimalBase

com.fasterxml.jackson.core.base.ParserBase

com.fasterxml.jackson.core.json.async.NonBlockingJsonParserBase

All Implemented Interfaces:

Versioned, java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

NonBlockingJsonParser

public abstract class NonBlockingJsonParserBase
extends ParserBase

Intermediate base class for non-blocking JSON parsers.

Nested Class Summary

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

JsonParser.Feature, JsonParser.NumberType

Constructor Summary

Constructors

Constructor and Description
NonBlockingJsonParserBase(IOContext ctxt, int parserFeatures, ByteQuadsCanonicalizer sym)

Method Summary

Modifier and Type	Method and Description
boolean	canParseAsync() Method that can be called to determine if this parser instance uses non-blocking ("asynchronous") input access for decoding or not.
byte[]	getBinaryValue(Base64Variant b64variant) Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value.
ObjectCodec	getCodec() Accessor for ObjectCodec associated with this parser, if any.
JsonLocation	getCurrentLocation() Method that returns location of the last processed character; usually for error reporting purposes
java.lang.Object	getEmbeddedObject() Accessor that can be called if (and only if) the current token is JsonToken.VALUE_EMBEDDED_OBJECT.
java.lang.Object	getInputSource() Method that can be used to get access to object that is used to access input being parsed; this is usually either InputStream or Reader, depending on what parser was constructed with.
JacksonFeatureSet<StreamReadCapability>	getReadCapabilities() Accessor for getting metadata on capabilities of this parser, based on underlying data format being read (directly or indirectly).
java.lang.String	getText() Method for accessing textual representation of the current event; if no current event (before first call to ParserMinimalBase.nextToken(), or after encountering end-of-input), returns null.
int	getText(java.io.Writer writer) Method to read the textual representation of the current token in chunks and pass it to the given Writer.
char[]	getTextCharacters() Method similar to JsonParser.getText(), but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information.
int	getTextLength() Accessor used with JsonParser.getTextCharacters(), to know length of String stored in returned buffer.
int	getTextOffset() Accessor used with JsonParser.getTextCharacters(), to know offset of the first text content character within buffer.
JsonLocation	getTokenLocation() Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.
java.lang.String	getValueAsString() Method that will try to convert value of current token to a String.
java.lang.String	getValueAsString(java.lang.String defValue) Method that will try to convert value of current token to a String.
boolean	hasTextCharacters() Method that can be used to determine whether calling of JsonParser.getTextCharacters() would be the most efficient way to access textual content for the event parser currently points to.
int	readBinaryValue(Base64Variant b64variant, java.io.OutputStream out) Similar to JsonParser.readBinaryValue(OutputStream) but allows explicitly specifying base64 variant to use.
abstract int	releaseBuffered(java.io.OutputStream out) Method that can be called to push back any content that has been read but not consumed by the parser.
void	setCodec(ObjectCodec c) Setter that allows defining ObjectCodec associated with this parser, if any.

Methods inherited from class com.fasterxml.jackson.core.base.ParserBase

_getByteArrayBuilder, close, disable, enable, getBigIntegerValue, getCurrentName, getCurrentValue, getDecimalValue, getDoubleValue, getFloatValue, getIntValue, getLongValue, getNumberType, getNumberValue, getNumberValueExact, getParsingContext, getTokenCharacterOffset, getTokenColumnNr, getTokenLineNr, isClosed, isNaN, overrideCurrentName, overrideStdFeatures, setCurrentValue, setFeatureMask, version

Methods inherited from class com.fasterxml.jackson.core.base.ParserMinimalBase

clearCurrentToken, currentToken, currentTokenId, getCurrentToken, getCurrentTokenId, getLastClearedToken, getValueAsBoolean, getValueAsDouble, getValueAsInt, getValueAsInt, getValueAsLong, getValueAsLong, hasCurrentToken, hasToken, hasTokenId, isExpectedNumberIntToken, isExpectedStartArrayToken, isExpectedStartObjectToken, nextToken, nextValue, skipChildren

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

assignCurrentValue, canReadObjectId, canReadTypeId, canUseSchema, configure, currentLocation, currentName, currentTokenLocation, currentValue, finishToken, getBinaryValue, getBooleanValue, getByteValue, getFeatureMask, getFormatFeatures, getNonBlockingInputFeeder, getObjectId, getSchema, getShortValue, getTypeId, getValueAsBoolean, getValueAsDouble, isEnabled, isEnabled, nextBooleanValue, nextFieldName, nextFieldName, nextIntValue, nextLongValue, nextTextValue, overrideFormatFeatures, readBinaryValue, readValueAs, readValueAs, readValueAsTree, readValuesAs, readValuesAs, releaseBuffered, requiresCustomCodec, setRequestPayloadOnError, setRequestPayloadOnError, setRequestPayloadOnError, setSchema

Methods inherited from class java.lang.Object

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

Constructor Detail

NonBlockingJsonParserBase

public NonBlockingJsonParserBase(IOContext ctxt,
                                 int parserFeatures,
                                 ByteQuadsCanonicalizer sym)

Method Detail

getCodec

public ObjectCodec getCodec()

Description copied from class: JsonParser

Accessor for ObjectCodec associated with this parser, if any. Codec is used by JsonParser.readValueAs(Class) method (and its variants).

Specified by:

getCodec in class JsonParser

Returns:

Codec assigned to this parser, if any; null if none

setCodec

public void setCodec(ObjectCodec c)

Description copied from class: JsonParser

Setter that allows defining ObjectCodec associated with this parser, if any. Codec is used by JsonParser.readValueAs(Class) method (and its variants).

Specified by:

setCodec in class JsonParser

Parameters:

c - Codec to assign, if any; null if none

canParseAsync

public boolean canParseAsync()

Description copied from class: JsonParser

Method that can be called to determine if this parser instance uses non-blocking ("asynchronous") input access for decoding or not. Access mode is determined by earlier calls via JsonFactory; it may not be changed after construction.

If non-blocking decoding is (@code true}, it is possible to call JsonParser.getNonBlockingInputFeeder() to obtain object to use for feeding input; otherwise (false returned) input is read by blocking

Overrides:

canParseAsync in class JsonParser

Returns:

True if this is a non-blocking ("asynchronous") parser

getReadCapabilities

public JacksonFeatureSet<StreamReadCapability> getReadCapabilities()

Description copied from class: JsonParser

Accessor for getting metadata on capabilities of this parser, based on underlying data format being read (directly or indirectly).

Overrides:

getReadCapabilities in class JsonParser

Returns:

Set of read capabilities for content to read via this parser

releaseBuffered

public abstract int releaseBuffered(java.io.OutputStream out)
                             throws java.io.IOException

Description copied from class: JsonParser

Method that can be called to push back any content that has been read but not consumed by the parser. This is usually done after reading all content of interest using parser. Content is released by writing it to given stream if possible; if underlying input is byte-based it can released, if not (char-based) it can not.

Overrides:

releaseBuffered in class JsonParser

Parameters:

out - OutputStream to which buffered, undecoded content is written to

Returns:

-1 if the underlying content source is not byte based (that is, input can not be sent to OutputStream; otherwise number of bytes released (0 if there was nothing to release)

Throws:

java.io.IOException - if write to stream threw exception

getInputSource

public java.lang.Object getInputSource()

Description copied from class: JsonParser

Method that can be used to get access to object that is used to access input being parsed; this is usually either InputStream or Reader, depending on what parser was constructed with. Note that returned value may be null in some cases; including case where parser implementation does not want to exposed raw source to caller. In cases where input has been decorated, object returned here is the decorated version; this allows some level of interaction between users of parser 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.

Overrides:

getInputSource in class JsonParser

Returns:

Input source this parser was configured with

hasTextCharacters

public boolean hasTextCharacters()

Description copied from class: JsonParser

Method that can be used to determine whether calling of JsonParser.getTextCharacters() would be the most efficient way to access textual content for the event parser currently points to.

Default implementation simply returns false since only actual implementation class has knowledge of its internal buffering state. Implementations are strongly encouraged to properly override this method, to allow efficient copying of content by other code.

Overrides:

hasTextCharacters in class ParserBase

Returns:

True if parser currently has character array that can be efficiently returned via JsonParser.getTextCharacters(); false means that it may or may not exist

getCurrentLocation

public JsonLocation getCurrentLocation()

Description copied from class: ParserBase

Method that returns location of the last processed character; usually for error reporting purposes

Overrides:

getCurrentLocation in class ParserBase

Returns:

Location of the last processed input unit (byte or character)

getTokenLocation

public JsonLocation getTokenLocation()

Description copied from class: ParserBase

Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.

Overrides:

getTokenLocation in class ParserBase

Returns:

Starting location of the token parser currently points to

getText

public java.lang.String getText()
                         throws java.io.IOException

Method for accessing textual representation of the current event; if no current event (before first call to ParserMinimalBase.nextToken(), or after encountering end-of-input), returns null. Method can be called for any event.

Specified by:

getText in class ParserMinimalBase

Returns:

Textual value associated with the current token (one returned by JsonParser.nextToken() or other iteration methods)

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getText

public int getText(java.io.Writer writer)
            throws java.io.IOException

Description copied from class: JsonParser

Method to read the textual representation of the current token in chunks and pass it to the given Writer. Conceptually same as calling:

  writer.write(parser.getText());

but should typically be more efficient as longer content does need to be combined into a single String to return, and write can occur directly from intermediate buffers Jackson uses.

Overrides:

getText in class JsonParser

Parameters:

writer - Writer to write textual content to

Returns:

The number of characters written to the Writer

Throws:

java.io.IOException - for low-level read issues or writes using passed writer, or JsonParseException for decoding problems

getValueAsString

public java.lang.String getValueAsString()
                                  throws java.io.IOException

Description copied from class: JsonParser

Method that will try to convert value of current token to a String. JSON Strings map naturally; scalar values get converted to their textual representation. If representation can not be converted to a String value (including structured types like Objects and Arrays and null token), default value of null will be returned; no exceptions are thrown.

Overrides:

getValueAsString in class ParserMinimalBase

Returns:

String value current token is converted to, if possible; null otherwise

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getValueAsString

public java.lang.String getValueAsString(java.lang.String defValue)
                                  throws java.io.IOException

Description copied from class: JsonParser

Method that will try to convert value of current token to a String. JSON Strings map naturally; scalar values get converted to their textual representation. If representation can not be converted to a String value (including structured types like Objects and Arrays and null token), specified default value will be returned; no exceptions are thrown.

Overrides:

getValueAsString in class ParserMinimalBase

Parameters:

defValue - Default value to return if conversion to String is not possible

Returns:

String value current token is converted to, if possible; def otherwise

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getTextCharacters

public char[] getTextCharacters()
                         throws java.io.IOException

Description copied from class: JsonParser

Method similar to JsonParser.getText(), but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information. Note, however, that:

• Textual contents are not guaranteed to start at index 0 (rather, call JsonParser.getTextOffset()) to know the actual offset
• Length of textual contents may be less than the length of returned buffer: call JsonParser.getTextLength() for actual length of returned content.

Note that caller MUST NOT modify the returned character array in any way -- doing so may corrupt current parser state and render parser instance useless.

The only reason to call this method (over JsonParser.getText()) is to avoid construction of a String object (which will make a copy of contents).

Specified by:

getTextCharacters in class ParserMinimalBase

Returns:

Buffer that contains the current textual value (but not necessarily at offset 0, and not necessarily until the end of buffer)

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getTextLength

public int getTextLength()
                  throws java.io.IOException

Description copied from class: JsonParser

Accessor used with JsonParser.getTextCharacters(), to know length of String stored in returned buffer.

Specified by:

getTextLength in class ParserMinimalBase

Returns:

Number of characters within buffer returned by JsonParser.getTextCharacters() that are part of textual content of the current token.

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getTextOffset

public int getTextOffset()
                  throws java.io.IOException

Description copied from class: JsonParser

Accessor used with JsonParser.getTextCharacters(), to know offset of the first text content character within buffer.

Specified by:

getTextOffset in class ParserMinimalBase

Returns:

Offset of the first character within buffer returned by JsonParser.getTextCharacters() that is part of textual content of the current token.

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getBinaryValue

public byte[] getBinaryValue(Base64Variant b64variant)
                      throws java.io.IOException

Description copied from class: JsonParser

Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value. It works similar to getting String value via JsonParser.getText() and decoding result (except for decoding part), but should be significantly more performant.

Note that non-decoded textual contents of the current token are not guaranteed to be accessible after this method is called. Current implementation, for example, clears up textual content during decoding. Decoded binary content, however, will be retained until parser is advanced to the next event.

Overrides:

getBinaryValue in class ParserBase

Parameters:

b64variant - Expected variant of base64 encoded content (see Base64Variants for definitions of "standard" variants).

Returns:

Decoded binary data

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

readBinaryValue

public int readBinaryValue(Base64Variant b64variant,
                           java.io.OutputStream out)
                    throws java.io.IOException

Description copied from class: JsonParser

Similar to JsonParser.readBinaryValue(OutputStream) but allows explicitly specifying base64 variant to use.

Overrides:

readBinaryValue in class JsonParser

Parameters:

b64variant - base64 variant to use

out - Output stream to use for passing decoded binary data

Returns:

Number of bytes that were decoded and written via OutputStream

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems

getEmbeddedObject

public java.lang.Object getEmbeddedObject()
                                   throws java.io.IOException

Description copied from class: JsonParser

Accessor that can be called if (and only if) the current token is JsonToken.VALUE_EMBEDDED_OBJECT. For other token types, null is returned.

Note: only some specialized parser implementations support embedding of objects (usually ones that are facades on top of non-streaming sources, such as object trees). One exception is access to binary content (whether via base64 encoding or not) which typically is accessible using this method, as well as JsonParser.getBinaryValue().

Overrides:

getEmbeddedObject in class JsonParser

Returns:

Embedded value (usually of "native" type supported by format) for the current token, if any; null otherwise

Throws:

java.io.IOException - for low-level read issues, or JsonParseException for decoding problems