nextapp.echo2.webcontainer.image
Class AbstractImageService

java.lang.Object
  nextapp.echo2.webcontainer.image.AbstractImageService

All Implemented Interfaces:

Service

Direct Known Subclasses:

AwtImageService, StreamImageService

public abstract class AbstractImageService
extends java.lang.Object
implements Service

Abstract base service for rendering images sourced from the application container.

Field Summary

Fields inherited from interface nextapp.echo2.webrender.Service

DO_NOT_CACHE

Constructor Summary

AbstractImageService()

Method Summary

java.lang.String	createUri(ContainerInstance containerInstance, java.lang.String imageId) Creates a URI to retrieve a specific image for a specific component from the server.
abstract void	renderImage(Connection conn, ImageReference imageReference) Renders the specified image to the given connection.
void	service(Connection conn) Services an HTTP request.
void	serviceBadRequest(Connection conn, java.lang.String message)

Methods inherited from class java.lang.Object

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

Methods inherited from interface nextapp.echo2.webrender.Service

getId, getVersion

Constructor Detail

AbstractImageService

public AbstractImageService()

Method Detail

createUri

public java.lang.String createUri(ContainerInstance containerInstance,
                                  java.lang.String imageId)

Creates a URI to retrieve a specific image for a specific component from the server.

Parameters:

containerInstance - the relevant application container instance.

imageId - the unique id to retrieve the image from the ContainerInstance

renderImage

public abstract void renderImage(Connection conn,
                                 ImageReference imageReference)
                          throws java.io.IOException

Renders the specified image to the given connection. Implementations should set the response content type, and write image data to the response OutputStream.

Parameters:

conn - the Connection on which to render the image

imageReference - the image to be rendered

Throws:

java.io.IOException - if the image cannot be rendered

service

public void service(Connection conn)
             throws java.io.IOException

Description copied from interface: Service

Services an HTTP request. Information about the HTTP request as well as methods for issuing a response are available from the provided Connection object.

Specified by:

service in interface Service

Parameters:

conn - A Connection object which wraps HttpServletRequest and HttpServletResponse objects and provides access to the facilities of the Echo application container.

Throws:

java.io.IOException - in the event of errors related to processing the HTTP request or producing a response.

See Also:

Service.service(nextapp.echo2.webrender.Connection)

serviceBadRequest

public void serviceBadRequest(Connection conn,
                              java.lang.String message)