ro.isdc.wro.extensions.processor.js
Class AbstractNodeWithFallbackProcessor

java.lang.Object
  ro.isdc.wro.extensions.processor.js.AbstractNodeWithFallbackProcessor

All Implemented Interfaces:

ResourcePostProcessor, ResourcePreProcessor

Direct Known Subclasses:

CoffeeScriptProcessor, LessCssProcessor, TypeScriptProcessor

public abstract class AbstractNodeWithFallbackProcessor
extends Object
implements ResourcePreProcessor, ResourcePostProcessor

An abstract processor which should be extended by processors which can provide both: node & a fallback (usually rhino) implementation of processor. The node version of processor is preferred, but if unavailable - the fallback will be used.

Since:

1.6.3

Author:

Alex Objelean

Constructor Summary

AbstractNodeWithFallbackProcessor()

Method Summary

protected abstract ResourcePreProcessor	createFallbackProcessor() Lazily initialize the rhinoProcessor.
protected abstract ResourcePreProcessor	createNodeProcessor()
void	process(Reader reader, Writer writer) Perform actual resource processing.
void	process(Resource resource, Reader reader, Writer writer) Process a content supplied by a reader and perform some sort of processing.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractNodeWithFallbackProcessor

public AbstractNodeWithFallbackProcessor()

Method Detail

createNodeProcessor

protected abstract ResourcePreProcessor createNodeProcessor()

Returns:

ResourcePreProcessor used as a primary processor.

process

public final void process(Resource resource,
                          Reader reader,
                          Writer writer)
                   throws IOException

Process a content supplied by a reader and perform some sort of processing. It is important to know that you should use reader for processing instead of trying to access the resource original content using Resource, because this way you can ignore the other preProcessors from the chain.
It is not require to explicitly handle exception. When the processing fails, the following can happen:

• the exception is wrapped in RuntimeException and the processing chain is interrupted (by default)
• content remains unchanged (if WroConfiguration.isIgnoreFailingProcessor() is true)

It is not required to close the reader and writers, because these will be closed for you.

Specified by:

process in interface ResourcePreProcessor

Parameters:

resource - the original resource as it found in the model.

reader - Reader used to read processed resource content.

writer - Writer where used to write processed results.

Throws:

IOException - when an exception occurs. The future version will change the exception type to Exception, because any exception may occur during processing. The processing failure will be handled based on value of WroConfiguration.isIgnoreFailingProcessor() configuration flag.

process

public final void process(Reader reader,
                          Writer writer)
                   throws IOException

Perform actual resource processing. The content to be processed is read from source Reader and is written to destination Writer. It is the client responsibility to close both: Reader and writer.

Specified by:

process in interface ResourcePostProcessor

Parameters:

reader - source stream.

writer - destination stream.

Throws:

IOException

createFallbackProcessor

protected abstract ResourcePreProcessor createFallbackProcessor()

Lazily initialize the rhinoProcessor.

Returns:

ResourcePreProcessor used as a fallback processor.