org.apache.tapestry5.services.assets

Interface StreamableResourceSource

All Known Implementing Classes:

CSSURLRewriter, DelegatingSRS, JavaScriptStackMinimizeDisabler, SRSCachingInterceptor, SRSCompressedCachingInterceptor, SRSCompressingInterceptor, SRSMinimizingInterceptor, StreamableResourceSourceImpl, UTF8ForTextAssets

@UsesMappedConfiguration(value=ResourceTransformer.class)
public interface StreamableResourceSource

Converts Resources into StreamableResources, and may be responsible for transforming resources based on file extension. Contributions map a file extension (such as "coffee") to a transformer for that file extension. Service decorators added to this service may provide additional processing (compression, minimization, and caching).

Since:

5.3

Method Summary

Modifier and Type	Method and Description
java.util.Set<java.lang.String>	fileExtensionsForContentType(ContentType contentType) Given a desired content type, identify which file extensions can be mapped to that extension based on contributed ResourceTransformers that can produce the content type based for a file with that extension.
StreamableResource	getStreamableResource(Resource baseResource, StreamableResourceProcessing processing, ResourceDependencies dependencies) Converts a Resource (which must be non-null and exist) into a streamable resource, along with some additional optional behaviors.

Method Detail

fileExtensionsForContentType

java.util.Set<java.lang.String> fileExtensionsForContentType(ContentType contentType)

Given a desired content type, identify which file extensions can be mapped to that extension based on contributed ResourceTransformers that can produce the content type based for a file with that extension.

Parameters:

contentType - to search for (just a MIME type, such as "text/javascript")

Returns:

set of file extension, possibly empty, in no particular order. These are the bare extensions, e.g., "js", "coffee".

Since:

5.4

getStreamableResource

StreamableResource getStreamableResource(Resource baseResource,
                                         StreamableResourceProcessing processing,
                                         ResourceDependencies dependencies)
                                  throws java.io.IOException

Converts a Resource (which must be non-null and exist) into a streamable resource, along with some additional optional behaviors.

Parameters:

baseResource - the resource to convert

processing - defines additional processing after the resource has been read and possibly transformed

dependencies - Passed to any ResourceTransformer to track additional dependencies of the base resource

Returns:

the contents of the Resource, possibly transformed, in a streamable format.

Throws:

java.io.IOException - if the resource does not exist or a URL for the content is not available