Record Class JpegHeader

java.lang.Object

java.lang.Record

cloud.opencode.base.image.codec.jpeg.JpegHeader

Record Components:

width - image width in pixels (positive) | 图像宽度（像素，正整数）

height - image height in pixels (positive) | 图像高度（像素，正整数）

subsampling - chroma subsampling mode | 色度下采样模式

public record JpegHeader(int width, int height, JpegSubsampling subsampling)
extends Record

JPEG header information returned by JpegCodec.readHeader(byte[]). JpegCodec.readHeader(byte[]) 返回的 JPEG 头信息。

Carries the dimensions and chroma subsampling mode encoded in the JPEG stream, without performing any pixel decode.

携带 JPEG 流中编码的尺寸与色度下采样模式，不执行任何像素解码。

Security | 安全性:

• Thread-safe: Yes - record is immutable. - 线程安全: 是 - record 不可变。

Since:

JDK 25, opencode-base-image-codec V1.0.4

Author:

Leon Soo www.LeonSoo.com

See Also:

• JpegCodec
• JpegSubsampling
• OpenCode.cloud

Constructor Summary

Constructors

Constructor	Description
JpegHeader(int width, int height, JpegSubsampling subsampling)	Creates an instance of a JpegHeader record class.

Method Summary

Modifier and Type	Method	Description
final boolean	equals(Object o)	Indicates whether some other object is "equal to" this one.
final int	hashCode()	Returns a hash code value for this object.
int	height()	Returns the value of the height record component.
JpegSubsampling	subsampling()	Returns the value of the subsampling record component.
final String	toString()	Returns a string representation of this record class.
int	width()	Returns the value of the width record component.

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

JpegHeader

public JpegHeader(int width,
 int height,
 JpegSubsampling subsampling)

Creates an instance of a JpegHeader record class.

Parameters:

width - the value for the width record component

height - the value for the height record component

subsampling - the value for the subsampling record component

Method Details

toString

public final String toString()

Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.

Specified by:

toString in class Record

Returns:

a string representation of this object

hashCode

public final int hashCode()

Returns a hash code value for this object. The value is derived from the hash code of each of the record components.

Specified by:

hashCode in class Record

Returns:

a hash code value for this object

equals

public final boolean equals(Object o)

Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with the compare method from their corresponding wrapper classes.

Specified by:

equals in class Record

Parameters:

o - the object with which to compare

Returns:

true if this object is the same as the o argument; false otherwise.

width

public int width()

Returns the value of the width record component.

Returns:

the value of the width record component

height

public int height()

Returns the value of the height record component.

Returns:

the value of the height record component

subsampling

public JpegSubsampling subsampling()

Returns the value of the subsampling record component.

Returns:

the value of the subsampling record component