AppCacheManifestTransformer (Spring Framework 4.3.30.RELEASE API)

java.lang.Object
- org.springframework.web.servlet.resource.ResourceTransformerSupport
- - org.springframework.web.servlet.resource.AppCacheManifestTransformer

All Implemented Interfaces:
ResourceTransformer
```
public class AppCacheManifestTransformer
extends ResourceTransformerSupport
```
A ResourceTransformer implementation that helps handling resources within HTML5 AppCache manifests for HTML5 offline applications.
This transformer:
- modifies links to match the public URL paths that should be exposed to clients, using configured ResourceResolver strategies
- appends a comment in the manifest, containing a Hash (e.g. "# Hash: 9de0f09ed7caf84e885f1f0f11c7e326"), thus changing the content of the manifest in order to trigger an appcache reload in the browser.
All files that have the ".manifest" file extension, or the extension given in the constructor, will be transformed by this class.
This hash is computed using the content of the appcache manifest and the content of the linked resources; so changing a resource linked in the manifest or the manifest itself should invalidate the browser cache.
Since:
4.1
Author:
Brian Clozel
See Also:
HTML5 offline applications spec

Constructor Summary

Constructors
Constructor	Description
`AppCacheManifestTransformer()`	Create an AppCacheResourceTransformer that transforms files with extension ".manifest".
`AppCacheManifestTransformer(String fileExtension)`	Create an AppCacheResourceTransformer that transforms files with the extension given as a parameter.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Resource`	`transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain)`	Transform the given resource.

Methods inherited from class org.springframework.web.servlet.resource.ResourceTransformerSupport
getResourceUrlProvider, resolveUrlPath, setResourceUrlProvider

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AppCacheManifestTransformer
```
public AppCacheManifestTransformer()
```
    Create an AppCacheResourceTransformer that transforms files with extension ".manifest".
  - AppCacheManifestTransformer
```
public AppCacheManifestTransformer(String fileExtension)
```
    Create an AppCacheResourceTransformer that transforms files with the extension given as a parameter.
- Method Detail
  - transform
```
public Resource transform(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