TextBuffer (jackson-core 2.16.0-rc1)

java.lang.Object
- com.fasterxml.jackson.core.util.TextBuffer

Direct Known Subclasses:

ReadConstrainedTextBuffer
```
public class TextBuffer
extends Object
```
TextBuffer is a class similar to StringBuffer, with following differences:
- TextBuffer uses segments character arrays, to avoid having to do additional array copies when array is not big enough. This means that only reallocating that is necessary is done only once: if and when caller wants to access contents in a linear array (char[], String).
- TextBuffer can also be initialized in "shared mode", in which it will just act as a wrapper to a single char array managed by another object (like parser that owns it)
- TextBuffer is not synchronized.

Constructor Summary

Constructors
Modifier Constructor and Description

TextBuffer(BufferRecycler allocator)

protected TextBuffer(BufferRecycler allocator, char[] initialSegment)

Constructors
Modifier	Constructor and Description
	`TextBuffer(BufferRecycler allocator)`
`protected`	`TextBuffer(BufferRecycler allocator, char[] initialSegment)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`protected void`	`_reportBufferOverflow(int prev, int curr)`
`void`	`append(char c)`
`void`	`append(char[] c, int start, int len)`
`void`	`append(String str, int offset, int len)`
`char[]`	`contentsAsArray()`
`BigDecimal`	`contentsAsDecimal()` Deprecated. Since 2.15 just access String contents if necessary, call `NumberInput.parseBigDecimal(String, boolean)` (or other overloads) directly instead
`double`	`contentsAsDouble()` Deprecated. use `contentsAsDouble(boolean)`
`double`	`contentsAsDouble(boolean useFastParser)` Convenience method for converting contents of the buffer into a Double value.
`float`	`contentsAsFloat()` Deprecated. use `contentsAsFloat(boolean)`
`float`	`contentsAsFloat(boolean useFastParser)` Convenience method for converting contents of the buffer into a Float value.
`int`	`contentsAsInt(boolean neg)` Specialized convenience method that will decode a 32-bit int, of at most 9 digits (and possible leading minus sign).
`long`	`contentsAsLong(boolean neg)` Specialized convenience method that will decode a 64-bit int, of at most 18 digits (and possible leading minus sign).
`String`	`contentsAsString()` Accessor that may be used to get the contents of this buffer as a single `String` regardless of whether they were collected in a segmented fashion or not: this typically require construction of the result String.
`int`	`contentsToWriter(Writer w)` Accessor that will write buffered contents using given `Writer`.
`char[]`	`emptyAndGetCurrentSegment()`
`void`	`ensureNotShared()` Method called to make sure that buffer is not using shared input buffer; if it is, it will copy such contents to private buffer.
`char[]`	`expandCurrentSegment()` Method called to expand size of the current segment, to accommodate for more contiguous content.
`char[]`	`expandCurrentSegment(int minSize)` Method called to expand size of the current segment, to accommodate for more contiguous content.
`String`	`finishAndReturn(int lastSegmentEnd, boolean trimTrailingSpaces)`
`char[]`	`finishCurrentSegment()`
`static TextBuffer`	`fromInitial(char[] initialSegment)` Factory method for constructing an instance with no allocator, and with initial full segment.
`char[]`	`getBufferWithoutReset()` Method for accessing the currently active (last) content segment without changing state of the buffer
`char[]`	`getCurrentSegment()`
`int`	`getCurrentSegmentSize()`
`char[]`	`getTextBuffer()` Accessor that may be used to get the contents of this buffer as a single `char[]` regardless of whether they were collected in a segmented fashion or not: this typically require allocation of the result buffer.
`int`	`getTextOffset()`
`boolean`	`hasTextAsCharacters()` Method that can be used to check whether textual contents can be efficiently accessed using `getTextBuffer()`.
`void`	`releaseBuffers()` Method called to indicate that the underlying buffers should now be recycled if they haven't yet been recycled.
`void`	`resetWith(char ch)` Method for clearing out possibly existing content, and replacing them with a single-character content (so `size()` would return `1`)
`void`	`resetWithCopy(char[] buf, int offset, int len)`
`void`	`resetWithCopy(String text, int start, int len)`
`void`	`resetWithEmpty()` Method called to clear out any content text buffer may have, and initializes buffer to use non-shared data.
`void`	`resetWithShared(char[] buf, int offset, int len)` Method called to initialize the buffer with a shared copy of data; this means that buffer will just have pointers to actual data.
`void`	`resetWithString(String value)`
`String`	`setCurrentAndReturn(int len)` Convenience method that finishes the current active content segment (by specifying how many characters within consists of valid content) and aggregates and returns resulting contents (similar to a call to `contentsAsString()`).
`void`	`setCurrentLength(int len)`
`int`	`size()`
`String`	`toString()` Note: calling this method may not be as efficient as calling `contentsAsString()`, since it's not guaranteed that resulting String is cached.
`protected void`	`validateStringLength(int length)` Convenience method that can be used to verify that a String of specified length does not exceed maximum specific by this constraints object: if it does, a `JsonParseException` is thrown.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - TextBuffer
```
public TextBuffer(BufferRecycler allocator)
```
  - TextBuffer
```
protected TextBuffer(BufferRecycler allocator,
                     char[] initialSegment)
```
- Method Detail
  - fromInitial
```
public static TextBuffer fromInitial(char[] initialSegment)
```
    Factory method for constructing an instance with no allocator, and with initial full segment.
    
    Parameters:
    
    initialSegment - Initial, full segment to use for creating buffer (buffer size() would return length of initialSegment)
    
    Returns:
    
    TextBuffer constructed
    
    Since:
    
    2.10
  - releaseBuffers
```
public void releaseBuffers()
```
    Method called to indicate that the underlying buffers should now be recycled if they haven't yet been recycled. Although caller can still use this text buffer, it is not advisable to call this method if that is likely, since next time a buffer is needed, buffers need to reallocated.
    Note: since Jackson 2.11, calling this method will NOT clear already aggregated contents (that is, _currentSegment, to retain current token text if (but only if!) already aggregated.
  - resetWithEmpty
```
public void resetWithEmpty()
```
    Method called to clear out any content text buffer may have, and initializes buffer to use non-shared data.
  - resetWith
```
public void resetWith(char ch)
```
    Method for clearing out possibly existing content, and replacing them with a single-character content (so size() would return 1)
    
    Parameters:
    
    ch - Character to set as the buffer contents
    
    Since:
    
    2.9
  - resetWithShared
```
public void resetWithShared(char[] buf,
                            int offset,
                            int len)
```
    Method called to initialize the buffer with a shared copy of data; this means that buffer will just have pointers to actual data. It also means that if anything is to be appended to the buffer, it will first have to unshare it (make a local copy).
    
    Parameters:
    
    buf - Buffer that contains shared contents
    
    offset - Offset of the first content character in buf
    
    len - Length of content in buf
  - resetWithCopy
```
public void resetWithCopy(char[] buf,
                          int offset,
                          int len)
                   throws IOException
```
    Parameters:
    
    buf - Buffer that contains new contents
    
    offset - Offset of the first content character in buf
    
    len - Length of content in buf
    
    Throws:
    
    IOException - if the buffer has grown too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - resetWithCopy
```
public void resetWithCopy(String text,
                          int start,
                          int len)
                   throws IOException
```
    Parameters:
    
    text - String that contains new contents
    
    start - Offset of the first content character in text
    
    len - Length of content in text
    
    Throws:
    
    IOException - if the buffer has grown too large, see StreamReadConstraints.Builder.maxStringLength(int)
    
    Since:
    
    2.9
  - resetWithString
```
public void resetWithString(String value)
                     throws IOException
```
    Parameters:
    
    value - to replace existing buffer
    
    Throws:
    
    IOException - if the value is too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - getBufferWithoutReset
```
public char[] getBufferWithoutReset()
```
    Method for accessing the currently active (last) content segment without changing state of the buffer
    
    Returns:
    
    Currently active (last) content segment
    
    Since:
    
    2.9
  - size
```
public int size()
```
    Returns:
    
    Number of characters currently stored in this buffer
  - getTextOffset
```
public int getTextOffset()
```
  - hasTextAsCharacters
```
public boolean hasTextAsCharacters()
```
    Method that can be used to check whether textual contents can be efficiently accessed using getTextBuffer().
    
    Returns:
    
    True if access via getTextBuffer() would be efficient (that is, content already available as aggregated char[])
  - getTextBuffer
```
public char[] getTextBuffer()
                     throws IOException
```
    Accessor that may be used to get the contents of this buffer as a single char[] regardless of whether they were collected in a segmented fashion or not: this typically require allocation of the result buffer.
    
    Returns:
    
    Aggregated char[] that contains all buffered content
    
    Throws:
    
    IOException - if the text is too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - contentsAsString
```
public String contentsAsString()
                        throws IOException
```
    Accessor that may be used to get the contents of this buffer as a single String regardless of whether they were collected in a segmented fashion or not: this typically require construction of the result String.
    
    Returns:
    
    Aggregated buffered contents as a String
    
    Throws:
    
    IOException - if the contents are too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - contentsAsArray
```
public char[] contentsAsArray()
                       throws IOException
```
    Returns:
    
    char array
    
    Throws:
    
    IOException - if the text is too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - contentsAsDouble
```
public double contentsAsDouble(boolean useFastParser)
                        throws NumberFormatException
```
    Convenience method for converting contents of the buffer into a Double value.
    
    Parameters:
    
    useFastParser - whether to use FastDoubleParser
    
    Returns:
    
    Buffered text value parsed as a Double, if possible
    
    Throws:
    
    NumberFormatException - if contents are not a valid Java number
    
    Since:
    
    2.14
  - contentsAsDouble
```
@Deprecated
public double contentsAsDouble()
                                    throws NumberFormatException
```
    Deprecated. use contentsAsDouble(boolean)
    
    Convenience method for converting contents of the buffer into a Double value.
    
    Returns:
    
    Buffered text value parsed as a Double, if possible
    
    Throws:
    
    NumberFormatException - if contents are not a valid Java number
  - contentsAsFloat
```
@Deprecated
public float contentsAsFloat()
                                  throws NumberFormatException
```
    Deprecated. use contentsAsFloat(boolean)
    
    Convenience method for converting contents of the buffer into a Float value.
    
    Returns:
    
    Buffered text value parsed as a Float, if possible
    
    Throws:
    
    NumberFormatException - if contents are not a valid Java number
  - contentsAsFloat
```
public float contentsAsFloat(boolean useFastParser)
                      throws NumberFormatException
```
    Convenience method for converting contents of the buffer into a Float value.
    
    Parameters:
    
    useFastParser - whether to use FastDoubleParser
    
    Returns:
    
    Buffered text value parsed as a Float, if possible
    
    Throws:
    
    NumberFormatException - if contents are not a valid Java number
    
    Since:
    
    2.14
  - contentsAsDecimal
```
@Deprecated
public BigDecimal contentsAsDecimal()
                                         throws NumberFormatException
```
    Deprecated. Since 2.15 just access String contents if necessary, call NumberInput.parseBigDecimal(String, boolean) (or other overloads) directly instead
    
    Returns:
    
    Buffered text value parsed as a BigDecimal, if possible
    
    Throws:
    
    NumberFormatException - if contents are not a valid Java number
  - contentsAsInt
```
public int contentsAsInt(boolean neg)
```
    Specialized convenience method that will decode a 32-bit int, of at most 9 digits (and possible leading minus sign).
    NOTE: method DOES NOT verify that the contents actually are a valid Java int value (either regarding format, or value range): caller MUST validate that.
    
    Parameters:
    
    neg - Whether contents start with a minus sign
    
    Returns:
    
    Buffered text value parsed as an int using NumberInput.parseInt(String) method (which does NOT validate input)
    
    Since:
    
    2.9
  - contentsAsLong
```
public long contentsAsLong(boolean neg)
```
    Specialized convenience method that will decode a 64-bit int, of at most 18 digits (and possible leading minus sign).
    NOTE: method DOES NOT verify that the contents actually are a valid Java long value (either regarding format, or value range): caller MUST validate that.
    
    Parameters:
    
    neg - Whether contents start with a minus sign
    
    Returns:
    
    Buffered text value parsed as an long using NumberInput.parseLong(String) method (which does NOT validate input)
    
    Since:
    
    2.9
  - contentsToWriter
```
public int contentsToWriter(Writer w)
                     throws IOException
```
    Accessor that will write buffered contents using given Writer.
    
    Parameters:
    
    w - Writer to use for writing out buffered content
    
    Returns:
    
    Number of characters written (same as size())
    
    Throws:
    
    IOException - If write using Writer parameter fails
    
    Since:
    
    2.8
  - ensureNotShared
```
public void ensureNotShared()
```
    Method called to make sure that buffer is not using shared input buffer; if it is, it will copy such contents to private buffer.
  - append
```
public void append(char c)
            throws IOException
```
    Parameters:
    
    c - char to append
    
    Throws:
    
    IOException - if the buffer has grown too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - append
```
public void append(char[] c,
                   int start,
                   int len)
            throws IOException
```
    Parameters:
    
    c - char array to append
    
    start - the start index within the array (from which we read chars to append)
    
    len - number of chars to take from the array
    
    Throws:
    
    IOException - if the buffer has grown too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - append
```
public void append(String str,
                   int offset,
                   int len)
            throws IOException
```
    Parameters:
    
    str - string to append
    
    offset - the start index within the string (from which we read chars to append)
    
    len - number of chars to take from the string
    
    Throws:
    
    IOException - if the buffer has grown too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - getCurrentSegment
```
public char[] getCurrentSegment()
```
  - emptyAndGetCurrentSegment
```
public char[] emptyAndGetCurrentSegment()
```
  - getCurrentSegmentSize
```
public int getCurrentSegmentSize()
```
  - setCurrentLength
```
public void setCurrentLength(int len)
```
  - setCurrentAndReturn
```
public String setCurrentAndReturn(int len)
                           throws IOException
```
    Convenience method that finishes the current active content segment (by specifying how many characters within consists of valid content) and aggregates and returns resulting contents (similar to a call to contentsAsString()).
    
    Parameters:
    
    len - Length of content (in characters) of the current active segment
    
    Returns:
    
    String that contains all buffered content
    
    Throws:
    
    IOException - if the text is too large, see StreamReadConstraints.Builder.maxStringLength(int)
    
    Since:
    
    2.6
  - finishCurrentSegment
```
public char[] finishCurrentSegment()
                            throws IOException
```
    Returns:
    
    char array
    
    Throws:
    
    IOException - if the text is too large, see StreamReadConstraints.Builder.maxStringLength(int)
  - finishAndReturn
```
public String finishAndReturn(int lastSegmentEnd,
                              boolean trimTrailingSpaces)
                       throws IOException
```
    Parameters:
    
    lastSegmentEnd - End offset in the currently active segment, could be 0 in the case of first character is delimiter or end-of-line
    
    trimTrailingSpaces - Whether trailing spaces should be trimmed or not
    
    Returns:
    
    token as text
    
    Throws:
    
    IOException - If length constraints (of longest allowed Text value) are violated
    
    Since:
    
    2.15
  - expandCurrentSegment
```
public char[] expandCurrentSegment()
```
    Method called to expand size of the current segment, to accommodate for more contiguous content. Usually only used when parsing tokens like names if even then. Method will both expand the segment and return it
    
    Returns:
    
    Expanded current segment
  - expandCurrentSegment
```
public char[] expandCurrentSegment(int minSize)
```
    Method called to expand size of the current segment, to accommodate for more contiguous content. Usually only used when parsing tokens like names if even then.
    
    Parameters:
    
    minSize - Required minimum strength of the current segment
    
    Returns:
    
    Expanded current segment
    
    Since:
    
    2.4
  - toString
```
public String toString()
```
    Note: calling this method may not be as efficient as calling contentsAsString(), since it's not guaranteed that resulting String is cached.
    
    Overrides:
    
    toString in class Object
  - _reportBufferOverflow
```
protected void _reportBufferOverflow(int prev,
                                     int curr)
```
  - validateStringLength
```
protected void validateStringLength(int length)
                             throws IOException
```
    Convenience method that can be used to verify that a String of specified length does not exceed maximum specific by this constraints object: if it does, a JsonParseException is thrown.
    
    Parameters:
    
    length - Length of string in input units
    
    Throws:
    
    IOException - If length exceeds maximum
    
    Since:
    
    2.15

Class TextBuffer

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TextBuffer

TextBuffer

Method Detail

fromInitial

releaseBuffers

resetWithEmpty

resetWith

resetWithShared

resetWithCopy

resetWithCopy

resetWithString

getBufferWithoutReset

size

getTextOffset

hasTextAsCharacters

getTextBuffer

contentsAsString

contentsAsArray

contentsAsDouble

contentsAsDouble

contentsAsFloat

contentsAsFloat

contentsAsDecimal

contentsAsInt

contentsAsLong

contentsToWriter

ensureNotShared

append

append

append

getCurrentSegment

emptyAndGetCurrentSegment

getCurrentSegmentSize

setCurrentLength

setCurrentAndReturn

finishCurrentSegment

finishAndReturn

expandCurrentSegment

expandCurrentSegment

toString

_reportBufferOverflow

validateStringLength