org.jfree.chart.encoders

Class SunJPEGEncoderAdapter

java.lang.Object

org.jfree.chart.encoders.SunJPEGEncoderAdapter

All Implemented Interfaces:

ImageEncoder

public class SunJPEGEncoderAdapter
extends Object
implements ImageEncoder

Adapter class for the Sun JPEG Encoder. The ImageEncoderFactory will only return a reference to this class by default if the library has been compiled under a JDK 1.4+ and is being run using a JRE 1.4+.

Constructor Summary

Constructors

Constructor and Description
SunJPEGEncoderAdapter() Creates a new SunJPEGEncoderAdapter instance.

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	encode(BufferedImage bufferedImage) Encodes an image in JPEG format.
void	encode(BufferedImage bufferedImage, OutputStream outputStream) Encodes an image in JPEG format and writes it to an output stream.
float	getQuality() Returns the quality of the image encoding, which is a number in the range 0.0f to 1.0f (higher values give better quality output, but larger file sizes).
boolean	isEncodingAlpha() Returns false always, indicating that this encoder does not encode alpha transparency.
void	setEncodingAlpha(boolean encodingAlpha) Set whether the encoder should encode alpha transparency (this is not supported for JPEG, so this method does nothing).
void	setQuality(float quality) Set the quality of the image encoding.

Methods inherited from class java.lang.Object

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

Constructor Detail

SunJPEGEncoderAdapter

public SunJPEGEncoderAdapter()

Creates a new SunJPEGEncoderAdapter instance.

Method Detail

getQuality

public float getQuality()

Returns the quality of the image encoding, which is a number in the range 0.0f to 1.0f (higher values give better quality output, but larger file sizes). The default value is 0.95f.

Specified by:

getQuality in interface ImageEncoder

Returns:

A float representing the quality, in the range 0.0f to 1.0f.

See Also:

setQuality(float)

setQuality

public void setQuality(float quality)

Set the quality of the image encoding.

Specified by:

setQuality in interface ImageEncoder

Parameters:

quality - A float representing the quality (in the range 0.0f to 1.0f).

See Also:

getQuality()

isEncodingAlpha

public boolean isEncodingAlpha()

Returns false always, indicating that this encoder does not encode alpha transparency.

Specified by:

isEncodingAlpha in interface ImageEncoder

Returns:

false.

setEncodingAlpha

public void setEncodingAlpha(boolean encodingAlpha)

Set whether the encoder should encode alpha transparency (this is not supported for JPEG, so this method does nothing).

Specified by:

setEncodingAlpha in interface ImageEncoder

Parameters:

encodingAlpha - ignored.

encode

public byte[] encode(BufferedImage bufferedImage)
              throws IOException

Encodes an image in JPEG format.

Specified by:

encode in interface ImageEncoder

Parameters:

bufferedImage - the image to be encoded (null not permitted).

Returns:

The byte[] that is the encoded image.

Throws:

IOException - if there is an I/O problem.

NullPointerException - if bufferedImage is null.

encode

public void encode(BufferedImage bufferedImage,
          OutputStream outputStream)
            throws IOException

Encodes an image in JPEG format and writes it to an output stream.

Specified by:

encode in interface ImageEncoder

Parameters:

bufferedImage - the image to be encoded (null not permitted).

outputStream - the OutputStream to write the encoded image to (null not permitted).

Throws:

IOException - if there is an I/O problem.

NullPointerException - if bufferedImage is null.