com.fasterxml.jackson.core.json

Class ReaderBasedJsonParser

    • Field Detail

      • _icLatin1

        protected static final int[] _icLatin1
      • _reader

        protected Reader _reader
        Reader that can be used for reading more content, if one buffer from input source, but in some cases pre-loaded buffer is handed to the parser.
      • _inputBuffer

        protected char[] _inputBuffer
        Current buffer from which data is read; generally data is read into buffer from input source.
      • _bufferRecyclable

        protected boolean _bufferRecyclable
        Flag that indicates whether the input buffer is recycable (and needs to be returned to recycler once we are done) or not.

        If it is not, it also means that parser can NOT modify underlying buffer.

      • _hashSeed

        protected final int _hashSeed
      • _tokenIncomplete

        protected boolean _tokenIncomplete
        Flag that indicates that the current token has not yet been fully processed, and needs to be finished for some access (or skipped to obtain the next token)
    • Constructor Detail

      • ReaderBasedJsonParser

        public ReaderBasedJsonParser(IOContext ctxt,
                             int features,
                             Reader r,
                             ObjectCodec codec,
                             CharsToNameCanonicalizer st,
                             char[] inputBuffer,
                             int start,
                             int end,
                             boolean bufferRecyclable)
        Method called when caller wants to provide input buffer directly, and it may or may not be recyclable use standard recycle context.
        Since:
        2.4
    • Method Detail

      • releaseBuffered

        public int releaseBuffered(Writer w)
                            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 writer if possible; if underlying input is char-based it can released, if not (byte-based) it can not.
        Overrides:
        releaseBuffered in class JsonParser
        Returns:
        -1 if the underlying content source is not char-based (that is, input can not be sent to Writer; otherwise number of chars released (0 if there was nothing to release)
        Throws:
        IOException - if write using Writer 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
      • _releaseBuffers

        protected void _releaseBuffers()
                                throws IOException
        Method called to release internal buffers owned by the base reader. This may be called along with _closeInput() (for example, when explicitly closing this reader instance), or separately (if need be).
        Overrides:
        _releaseBuffers in class ParserBase
        Throws:
        IOException
      • getText

        public final String getText()
                             throws IOException
        Method for accessing textual representation of the current event; if no current event (before first call to nextToken(), or after encountering end-of-input), returns null. Method can be called for any event.
        Specified by:
        getText in class ParserMinimalBase
        Throws:
        IOException
      • getValueAsString

        public final 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 JsonParser
        Throws:
        IOException
      • getValueAsString

        public final 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 final 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.

        Specified by:
        getBinaryValue in class ParserMinimalBase
        Parameters:
        b64variant - Expected variant of base64 encoded content (see Base64Variants for definitions of "standard" variants).
        Returns:
        Decoded binary data
        Throws:
        IOException
      • nextToken

        public final JsonToken nextToken()
                                  throws IOException
        Description copied from class: JsonParser
        Main iteration method, which will advance stream enough to determine type of the next token, if any. If none remaining (stream has no content other than possible white space before ending), null will be returned.
        Specified by:
        nextToken in class ParserMinimalBase
        Returns:
        Next token from the stream, if any found, or null to indicate end-of-input
        Throws:
        IOException
      • nextTextValue

        public final String nextTextValue()
                                   throws IOException
        Description copied from class: JsonParser
        Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_STRING returns contained String value; otherwise returns null. It is functionally equivalent to:
          return (nextToken() == JsonToken.VALUE_STRING) ? getText() : null;
        
        but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.
        Overrides:
        nextTextValue in class JsonParser
        Throws:
        IOException
      • nextIntValue

        public final int nextIntValue(int defaultValue)
                               throws IOException
        Description copied from class: JsonParser
        Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 32-bit int value; otherwise returns specified default value It is functionally equivalent to:
          return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getIntValue() : defaultValue;
        
        but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.
        Overrides:
        nextIntValue in class JsonParser
        Throws:
        IOException
      • nextLongValue

        public final long nextLongValue(long defaultValue)
                                 throws IOException
        Description copied from class: JsonParser
        Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 64-bit long value; otherwise returns specified default value It is functionally equivalent to:
          return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getLongValue() : defaultValue;
        
        but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.
        Overrides:
        nextLongValue in class JsonParser
        Throws:
        IOException
      • nextBooleanValue

        public final Boolean nextBooleanValue()
                                       throws IOException
        Description copied from class: JsonParser
        Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE returns matching Boolean value; otherwise return null. It is functionally equivalent to:
          JsonToken t = nextToken();
          if (t == JsonToken.VALUE_TRUE) return Boolean.TRUE;
          if (t == JsonToken.VALUE_FALSE) return Boolean.FALSE;
          return null;
        
        but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.
        Overrides:
        nextBooleanValue in class JsonParser
        Throws:
        IOException
      • _parseNumber

        protected final JsonToken _parseNumber(int ch)
                                        throws IOException
        Initial parsing method for number values. It needs to be able to parse enough input to be able to determine whether the value is to be considered a simple integer value, or a more generic decimal value: latter of which needs to be expressed as a floating point number. The basic rule is that if the number has no fractional or exponential part, it is an integer; otherwise a floating point number.

        Because much of input has to be processed in any case, no partial parsing is done: all input text will be stored for further processing. However, actual numeric value conversion will be deferred, since it is usually the most complicated and costliest part of processing.

        Throws:
        IOException
      • _handleInvalidNumberStart

        protected JsonToken _handleInvalidNumberStart(int ch,
                                          boolean negative)
                                               throws IOException
        Method called if expected numeric value (due to leading sign) does not look like a number
        Throws:
        IOException
      • _handleOddName

        protected String _handleOddName(int i)
                                 throws IOException
        Method called when we see non-white space character other than double quote, when expecting a field name. In standard mode will just throw an expection; but in non-standard modes may be able to parse name.
        Throws:
        IOException
      • _handleOddValue

        protected JsonToken _handleOddValue(int i)
                                     throws IOException
        Method for handling cases where first non-space character of an expected value token is not legal for standard JSON content.
        Throws:
        IOException
      • _skipString

        protected final void _skipString()
                                  throws IOException
        Method called to skim through rest of unparsed String value, if it is not needed. This can be done bit faster if contents need not be stored for future access.
        Throws:
        IOException
      • _skipCR

        protected final void _skipCR()
                              throws IOException
        We actually need to check the character value here (to see if we have \n following \r).
        Throws:
        IOException
      • _decodeEscaped

        protected char _decodeEscaped()
                               throws IOException
        Description copied from class: ParserBase
        Method that sub-classes must implement to support escaped sequences in base64-encoded sections. Sub-classes that do not need base64 support can leave this as is
        Overrides:
        _decodeEscaped in class ParserBase
        Throws:
        IOException
      • _matchToken

        protected final void _matchToken(String matchStr,
                       int i)
                                  throws IOException
        Helper method for checking whether input matches expected token
        Throws:
        IOException
      • _decodeBase64

        protected byte[] _decodeBase64(Base64Variant b64variant)
                                throws IOException
        Efficient handling for incremental parsing of base64-encoded textual content.
        Throws:
        IOException

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