ro.isdc.wro.model.resource.processor.impl.css
Class CssDataUriPreProcessor

java.lang.Object
  ro.isdc.wro.model.resource.processor.impl.css.AbstractCssUrlRewritingProcessor
      ro.isdc.wro.model.resource.processor.impl.css.CssDataUriPreProcessor

All Implemented Interfaces:

ResourcePostProcessor, ResourcePreProcessor

Direct Known Subclasses:

DuplicatesAwareCssDataUriPreProcessor

public class CssDataUriPreProcessor
extends AbstractCssUrlRewritingProcessor

Rewrites background images by replacing the url with data uri of the image. If the replacement is not successful, it is left unchanged.

For more details, @see http://en.wikipedia.org/wiki/Data_URI_scheme

Author:

Alex Objelean

Field Summary

static String

ALIAS

Fields inherited from class ro.isdc.wro.model.resource.processor.impl.css.AbstractCssUrlRewritingProcessor

PATTERN

Constructor Summary

CssDataUriPreProcessor()

Method Summary

protected boolean	isReplaceNeeded(String url) Check if url must be replaced or not.
protected String	replaceImageUrl(String cssUri, String imageUrl) Replace provided url with the new url if needed.
protected boolean	replaceWithDataUri(String dataUri) Decides whether the computed dataUri should replace the image url.

Methods inherited from class ro.isdc.wro.model.resource.processor.impl.css.AbstractCssUrlRewritingProcessor

cleanImageUrl, onProcessCompleted, onUrlReplaced, process, process

Methods inherited from class java.lang.Object

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

Field Detail

ALIAS

public static final String ALIAS

See Also:

Constant Field Values

Constructor Detail

CssDataUriPreProcessor

public CssDataUriPreProcessor()

Method Detail

replaceImageUrl

protected String replaceImageUrl(String cssUri,
                                 String imageUrl)

Replace provided url with the new url if needed.

Specified by:

replaceImageUrl in class AbstractCssUrlRewritingProcessor

Parameters:

imageUrl - to replace.

cssUri - Uri of the parsed css.

Returns:

replaced url.

replaceWithDataUri

protected boolean replaceWithDataUri(String dataUri)
                              throws UnsupportedEncodingException

Decides whether the computed dataUri should replace the image url. It is useful when you want to limit the dataUri size. By default the size of dataUri is limited to 32KB (because IE8 has a 32KB limitation).

Parameters:

dataUri - base64 encoded stream.

Returns:

true if dataUri should replace original image url.

Throws:

UnsupportedEncodingException

isReplaceNeeded

protected boolean isReplaceNeeded(String url)

Check if url must be replaced or not.

Overrides:

isReplaceNeeded in class AbstractCssUrlRewritingProcessor

Parameters:

url - to check.

Returns:

true if url needs to be replaced or remain unchanged.