Package com.fasterxml.jackson.core.json.async

Class NonBlockingJsonParserBase

    • Method Detail

      • 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 u (@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
        Since:
        2.9

      • releaseBuffered

        public abstract int releaseBuffered​(OutputStream out)
                             throws 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
        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:
        IOException - if write to stream threw exception

      • getInputSource

        public 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

      • 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

      • 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

      • getText

        public int getText​(Writer writer)
            throws 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
        Returns:
        The number of characters written to the Writer
        Throws:
        IOException

      • getValueAsString

        public String getValueAsString()
                        throws 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
        Throws:
        IOException

      • getValueAsString

        public String getValueAsString​(String defValue)
                        throws 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
        Throws:
        IOException

      • getTextCharacters

        public char[] getTextCharacters()
                         throws 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
        Throws:
        IOException

      • getBinaryValue

        public byte[] getBinaryValue​(Base64Variant b64variant)
                      throws 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:
        IOException

      • getEmbeddedObject

        public Object getEmbeddedObject()
                         throws 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
        Throws:
        IOException