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

Class FallbackCssDataUriProcessor

java.lang.Object

ro.isdc.wro.model.resource.processor.impl.css.AbstractCssUrlRewritingProcessor

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

ro.isdc.wro.model.resource.processor.impl.css.FallbackCssDataUriProcessor

All Implemented Interfaces:

ImportAware, ResourcePostProcessor, ResourcePreProcessor

public class FallbackCssDataUriProcessor
extends CssDataUriPreProcessor

Preserves the original css uri along with the new one. This should work also with browsers which do not support dataURI's.

Sample Input:

 div {
   background: url('image.png');
 }
 

Sample output:

  div {
   background: url('image.png');
   background: url('data:image/png;base64,iVBORw0...');
 }
 

Applies the graceful degradation technique. For example, if browser can't parse second rule, it'll use first one.

Since:

1.4.7

Author:

Alex Objelean

Field Summary

Fields

Modifier and Type	Field and Description
static String	ALIAS

Constructor Summary

Constructors

Constructor and Description
FallbackCssDataUriProcessor()

Method Summary

Methods

Modifier and Type	Method and Description
int	getDeclarationGroupIndex()
protected String	getPattern()
protected int	getUrlIndexA() index of the group containing an url inside a declaration of this form:
protected int	getUrlIndexB() index of the group containing an url inside a declaration of this form:
protected String	replaceDeclaration(String originalDeclaration, String modifiedDeclaration) Invoked to replace the entire css declaration.

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

getDataUriGenerator, isReplaceAccepted, isReplaceNeeded, replaceImageUrl, replaceWithDataUri

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

cleanImageUrl, getUrlPrefix, isImportAware, 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

FallbackCssDataUriProcessor

public FallbackCssDataUriProcessor()

Method Detail

replaceDeclaration

protected String replaceDeclaration(String originalDeclaration,
                        String modifiedDeclaration)

Invoked to replace the entire css declaration.

An example of css declaration:

 background: url(/image.png);
 

Useful when the css declaration should be changed. The use-case is: FallbackCssDataUriProcessor.

Overrides:

replaceDeclaration in class AbstractCssUrlRewritingProcessor

Parameters:

originalDeclaration - the original, unchanged declaration.

modifiedDeclaration - the changed expression.

Returns:

the expression to apply. By default the modifiedExpression will be returned.

getPattern

protected String getPattern()

Overrides:

getPattern in class AbstractCssUrlRewritingProcessor

Returns:

the string representation of the pattern used to match url's inside the css.

getDeclarationGroupIndex

public int getDeclarationGroupIndex()

Overrides:

getDeclarationGroupIndex in class AbstractCssUrlRewritingProcessor

Returns:

index of the group containing entire declaration (Ex: background: url(/path/to/image.png);)

getUrlIndexA

protected int getUrlIndexA()

index of the group containing an url inside a declaration of this form:

 body {
   filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='../images/tabs/tabContent.png', sizingMethod='scale' );
 }
 

or

Overrides:

getUrlIndexA in class AbstractCssUrlRewritingProcessor

getUrlIndexB

protected int getUrlIndexB()

index of the group containing an url inside a declaration of this form:

 body {
     background: #B3B3B3 url(img.gif);
     color:red;
 }
 

Overrides:

getUrlIndexB in class AbstractCssUrlRewritingProcessor