Package org.apache.wicket.markup.html.image.resource

Class BufferedDynamicImageResource

java.lang.Object

org.apache.wicket.request.resource.AbstractResource

org.apache.wicket.request.resource.DynamicImageResource

org.apache.wicket.markup.html.image.resource.BufferedDynamicImageResource

All Implemented Interfaces:

Serializable, IResource, IClusterable

public class BufferedDynamicImageResource
extends DynamicImageResource

A DynamicImageResource subclass that holds a BufferedImage generated by code elsewhere. The image is held in a non-transient field, and so if this resource is clustered, the entire image will be serialized and copied. If you can regenerate your image by drawing on a Graphics2D, you should prefer the RenderedDynamicImageResource class instead since its image data is transient and therefore it is very lightweight when clustered.

The format of the image (and therefore the resource's extension) can be specified with setFormat(String). The default format is "PNG" because JPEG is lossy and makes generated images look bad and GIF has patent issues.

Author:

Jonathan Locke

See Also:

RenderedDynamicImageResource, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.wicket.request.resource.AbstractResource

AbstractResource.ContentRangeType, AbstractResource.ResourceResponse, AbstractResource.WriteCallback

Nested classes/interfaces inherited from interface org.apache.wicket.request.resource.IResource

IResource.Attributes

Field Summary

Fields inherited from class org.apache.wicket.request.resource.AbstractResource

CONTENT_DISPOSITION_HEADER_NAME, CONTENT_RANGE_ENDBYTE, CONTENT_RANGE_STARTBYTE, INTERNAL_HEADERS

Constructor Summary

Constructors

Constructor	Description
BufferedDynamicImageResource()	Construct.
BufferedDynamicImageResource(String format)	Construct.

Method Summary

Modifier and Type	Method	Description
protected byte[]	getImageData(IResource.Attributes attributes)	Get image data for our dynamic image resource.
void	setImage(BufferedImage image)

Methods inherited from class org.apache.wicket.request.resource.DynamicImageResource

configureResponse, getFormat, newResourceResponse, setFormat, setLastModifiedTime, toImageData

Methods inherited from class org.apache.wicket.request.resource.AbstractResource

configureCache, getCachingStrategy, respond, setRequestMetaData, setRequestRangeMetaData, setResponseContentRangeHeaderFields, setResponseHeaders

Methods inherited from class java.lang.Object

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

Constructor Detail

BufferedDynamicImageResource

public BufferedDynamicImageResource()

Construct.

BufferedDynamicImageResource

public BufferedDynamicImageResource(String format)

Construct.

Parameters:

format -

Method Detail

setImage

public void setImage(BufferedImage image)

Parameters:

image - The image to set

getImageData

protected byte[] getImageData(IResource.Attributes attributes)

Description copied from class: DynamicImageResource

Get image data for our dynamic image resource. If the subclass regenerates the data, it should set the DynamicImageResource.setLastModifiedTime(Instant) when it does so. This ensures that image caching works correctly.

Specified by:

getImageData in class DynamicImageResource

Parameters:

attributes - the context bringing the request, response and the parameters

Returns:

The image data for this dynamic image. null means there is no image and 404 (Not found) response will be return.