org.springframework.web.servlet.resource

Class CachingResourceTransformer

java.lang.Object

org.springframework.web.servlet.resource.CachingResourceTransformer

All Implemented Interfaces:

ResourceTransformer

public class CachingResourceTransformer
extends java.lang.Object
implements ResourceTransformer

A ResourceTransformer that checks a Cache to see if a previously transformed resource exists in the cache and returns it if found, and otherwise delegates to the resolver chain and saves the result in the cache.

Since:

4.1

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field and Description
private Cache	cache
private static Log	logger

Constructor Summary

Constructors

Constructor and Description
CachingResourceTransformer(Cache cache)
CachingResourceTransformer(CacheManager cacheManager, java.lang.String cacheName)

Method Summary

Modifier and Type	Method and Description
Cache	getCache() Return the configured Cache.
Resource	transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain) Transform the given resource.

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final Log logger

cache

private final Cache cache

Constructor Detail

CachingResourceTransformer

public CachingResourceTransformer(CacheManager cacheManager,
                                  java.lang.String cacheName)

CachingResourceTransformer

public CachingResourceTransformer(Cache cache)

Method Detail

getCache

public Cache getCache()

Return the configured Cache.

transform

public Resource transform(HttpServletRequest request,
                          Resource resource,
                          ResourceTransformerChain transformerChain)
                   throws java.io.IOException

Description copied from interface: ResourceTransformer

Transform the given resource.

Specified by:

transform in interface ResourceTransformer

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:

java.io.IOException - if the transformation fails