com.alibaba.fastjson2.internal.asm

Class ByteVector

java.lang.Object

com.alibaba.fastjson2.internal.asm.ByteVector

public class ByteVector
extends java.lang.Object

A dynamically extensible vector of bytes. This class is roughly equivalent to a DataOutputStream on top of a ByteArrayOutputStream, but is more efficient.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) byte[]	data The content of this vector.
(package private) int	length The actual number of bytes in this vector.

Constructor Summary

Constructors

Constructor and Description
ByteVector(int initialCapacity) Constructs a new ByteVector with the given initial capacity.

Method Summary

Modifier and Type	Method and Description
(package private) void	encodeUtf8(java.lang.String stringValue, int offset) Puts an UTF8 string into this byte vector.
private void	enlarge(int size) Enlarges this byte vector so that it can receive 'size' more bytes.
(package private) void	put11(int byteValue1, int byteValue2) Puts two bytes into this byte vector.
(package private) ByteVector	put12(int byteValue, int shortValue) Puts a byte and a short into this byte vector.
(package private) void	put122(int byteValue, int shortValue1, int shortValue2) Puts one byte and two shorts into this byte vector.
ByteVector	putByte(int byteValue) Puts a byte into this byte vector.
void	putByteArray(byte[] byteArrayValue, int byteOffset, int byteLength) Puts an array of bytes into this byte vector.
ByteVector	putInt(int intValue) Puts an int into this byte vector.
void	putLong(long longValue) Puts a long into this byte vector.
ByteVector	putShort(int shortValue) Puts a short into this byte vector.
void	putUTF8(java.lang.String stringValue) Puts an UTF8 string into this byte vector.

Methods inherited from class java.lang.Object

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

Field Detail

data

byte[] data

The content of this vector. Only the first length bytes contain real data.

length

int length

The actual number of bytes in this vector.

Constructor Detail

ByteVector

public ByteVector(int initialCapacity)

Constructs a new ByteVector with the given initial capacity.

Parameters:

initialCapacity - the initial capacity of the byte vector to be constructed.

Method Detail

putByte

public ByteVector putByte(int byteValue)

Puts a byte into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

byteValue - a byte.

Returns:

this byte vector.

put11

final void put11(int byteValue1,
                 int byteValue2)

Puts two bytes into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

byteValue1 - a byte.

byteValue2 - another byte.

putShort

public ByteVector putShort(int shortValue)

Puts a short into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

shortValue - a short.

Returns:

this byte vector.

put12

final ByteVector put12(int byteValue,
                       int shortValue)

Puts a byte and a short into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

byteValue - a byte.

shortValue - a short.

Returns:

this byte vector.

putInt

public ByteVector putInt(int intValue)

Puts an int into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

intValue - an int.

Returns:

this byte vector.

put122

final void put122(int byteValue,
                  int shortValue1,
                  int shortValue2)

Puts one byte and two shorts into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

byteValue - a byte.

shortValue1 - a short.

shortValue2 - another short.

putLong

public void putLong(long longValue)

Puts a long into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

longValue - a long.

putUTF8

public void putUTF8(java.lang.String stringValue)

Puts an UTF8 string into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

stringValue - a String whose UTF8 encoded length must be less than 65536.

encodeUtf8

final void encodeUtf8(java.lang.String stringValue,
                      int offset)

Puts an UTF8 string into this byte vector. The byte vector is automatically enlarged if necessary. The string length is encoded in two bytes before the encoded characters, if there is space for that (i.e. if this.length - offset - 2 >= 0).

Parameters:

stringValue - the String to encode.

offset - the index of the first character to encode. The previous characters are supposed to have already been encoded, using only one byte per character.

putByteArray

public void putByteArray(byte[] byteArrayValue,
                         int byteOffset,
                         int byteLength)

Puts an array of bytes into this byte vector. The byte vector is automatically enlarged if necessary.

Parameters:

byteArrayValue - an array of bytes. May be null to put byteLength null bytes into this byte vector.

byteOffset - index of the first byte of byteArrayValue that must be copied.

byteLength - number of bytes of byteArrayValue that must be copied.

enlarge

private void enlarge(int size)

Enlarges this byte vector so that it can receive 'size' more bytes.

Parameters:

size - number of additional bytes that this byte vector should be able to receive.