Class CssLinkResourceTransformer

java.lang.Object

org.springframework.web.servlet.resource.ResourceTransformerSupport

org.springframework.web.servlet.resource.CssLinkResourceTransformer

All Implemented Interfaces:

ResourceTransformer

public class CssLinkResourceTransformer
extends ResourceTransformerSupport

A ResourceTransformer implementation that modifies links in a CSS file to match the public URL paths that should be exposed to clients (for example, with an MD5 content-based hash inserted in the URL).

The implementation looks for links in CSS @import statements and also inside CSS url() functions. All links are then passed through the ResourceResolverChain and resolved relative to the location of the containing CSS file. If successfully resolved, the link is modified, otherwise the original link is preserved.

Since:

4.1

Author:

Rossen Stoyanchev

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	CssLinkResourceTransformer.AbstractLinkParser	Abstract base class for CssLinkResourceTransformer.LinkParser implementations.
protected static interface	CssLinkResourceTransformer.LinkParser	Extract content chunks that represent links.

Constructor Summary

Constructors

Constructor	Description
CssLinkResourceTransformer()

Method Summary

Modifier and Type	Method	Description
Resource	transform(jakarta.servlet.http.HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain)	Transform the given resource.

Methods inherited from class ResourceTransformerSupport

getResourceUrlProvider, resolveUrlPath, setResourceUrlProvider, toAbsolutePath

Methods inherited from class Object

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

Constructor Details

CssLinkResourceTransformer

public CssLinkResourceTransformer()

Method Details

transform

public Resource transform(jakarta.servlet.http.HttpServletRequest request,
 Resource resource,
 ResourceTransformerChain transformerChain)
                   throws IOException

Description copied from interface: ResourceTransformer

Transform the given resource.

Parameters:

request - the current request

resource - the resource to transform

transformerChain - the chain of remaining transformers to delegate to

Returns:

the transformed resource (never null)

Throws:

IOException - if the transformation fails