Package org.antlr.v4.runtime

Class CodePointBuffer.Builder

java.lang.Object

org.antlr.v4.runtime.CodePointBuffer.Builder

Enclosing class:

CodePointBuffer

public static class CodePointBuffer.Builder
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private ByteBuffer	byteBuffer
private CharBuffer	charBuffer
private IntBuffer	intBuffer
private int	prevHighSurrogate
private CodePointBuffer.Type	type

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Builder(int initialBufferSize)

Method Summary

Modifier and Type	Method	Description
(package private) void	append(String utf16In)	Appends UTF-16 code units directly from a String without allocating a temporary CharBuffer or intermediate char array.
void	append(CharBuffer utf16In)	Appends UTF-16 code units from utf16In.
private void	appendArrayByte(char[] in, int start, int limit)
private void	appendArrayChar(char[] in, int start, int limit)
private void	appendArrayInt(char[] in, int start, int limit)
private void	appendCharSequenceByte(CharSequence utf16In, int start, int end)
private void	appendCharSequenceChar(CharSequence utf16In, int start, int end)
private void	appendCharSequenceInt(CharSequence utf16In, int start, int end)
private void	appendStringByte(String utf16In, int start)
private void	appendStringChar(String utf16In, int start)
private void	appendStringInt(String utf16In, int start)
CodePointBuffer	build()
private void	byteToCharBuffer(int toAppend)
private void	byteToIntBuffer(int toAppend)
private void	charToIntBuffer(int toAppend)
void	ensureRemaining(int remainingNeeded)
(package private) ByteBuffer	getByteBuffer()
(package private) CharBuffer	getCharBuffer()
(package private) IntBuffer	getIntBuffer()
(package private) CodePointBuffer.Type	getType()
private static int	roundUpToNextPowerOfTwo(int i)

Methods inherited from class java.lang.Object

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

Field Details

type

private CodePointBuffer.Type type

byteBuffer

private ByteBuffer byteBuffer

charBuffer

private CharBuffer charBuffer

intBuffer

private IntBuffer intBuffer

prevHighSurrogate

private int prevHighSurrogate

Constructor Details

Builder

private Builder(int initialBufferSize)

Method Details

getType

CodePointBuffer.Type getType()

getByteBuffer

ByteBuffer getByteBuffer()

getCharBuffer

CharBuffer getCharBuffer()

getIntBuffer

IntBuffer getIntBuffer()

build

public CodePointBuffer build()

roundUpToNextPowerOfTwo

private static int roundUpToNextPowerOfTwo(int i)

ensureRemaining

public void ensureRemaining(int remainingNeeded)

append

public void append(CharBuffer utf16In)

Appends UTF-16 code units from utf16In.

Array-backed buffers use a specialized monomorphic char[] conversion path to allow the HotSpot C2 compiler to inline accesses and eliminate bounds checks on the tight conversion loop. Non-array and read-only buffers (such as CharBuffer.wrap(CharSequence)) fall back to a zero-copy CharSequence interface path without throwing ReadOnlyBufferException.

Each call is treated as a complete UTF-16 sequence: an unpaired high surrogate at the end of a call is written as a lone code unit and is not carried across calls.

Parameters:

utf16In - input buffer containing UTF-16 code units to append

append

void append(String utf16In)

Appends UTF-16 code units directly from a String without allocating a temporary CharBuffer or intermediate char array.

Uses a highly optimized monomorphic String conversion path, allowing HotSpot C2 to inline String.charAt(int) directly down to raw memory reads on the hot CharStreams.fromString(String) path.

Package-private because the runtime's public string factory is CharStreams.fromString(String).

Parameters:

utf16In - input string containing UTF-16 code units to append

appendStringByte

private void appendStringByte(String utf16In,
 int start)

appendStringChar

private void appendStringChar(String utf16In,
 int start)

appendStringInt

private void appendStringInt(String utf16In,
 int start)

appendArrayByte

private void appendArrayByte(char[] in,
 int start,
 int limit)

appendArrayChar

private void appendArrayChar(char[] in,
 int start,
 int limit)

appendArrayInt

private void appendArrayInt(char[] in,
 int start,
 int limit)

appendCharSequenceByte

private void appendCharSequenceByte(CharSequence utf16In,
 int start,
 int end)

appendCharSequenceChar

private void appendCharSequenceChar(CharSequence utf16In,
 int start,
 int end)

appendCharSequenceInt

private void appendCharSequenceInt(CharSequence utf16In,
 int start,
 int end)

byteToCharBuffer

private void byteToCharBuffer(int toAppend)

byteToIntBuffer

private void byteToIntBuffer(int toAppend)

charToIntBuffer

private void charToIntBuffer(int toAppend)