/*
* Copyright (C) 2010.
* All rights reserved.
*/
package ro.isdc.wro.extensions.processor.js;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ro.isdc.wro.WroRuntimeException;
import ro.isdc.wro.extensions.processor.support.ObjectPoolHelper;
import ro.isdc.wro.extensions.processor.support.coffeescript.CoffeeScript;
import ro.isdc.wro.model.resource.Resource;
import ro.isdc.wro.model.resource.ResourceType;
import ro.isdc.wro.model.resource.SupportedResourceType;
import ro.isdc.wro.model.resource.processor.Destroyable;
import ro.isdc.wro.model.resource.processor.ResourcePostProcessor;
import ro.isdc.wro.model.resource.processor.ResourcePreProcessor;
import ro.isdc.wro.util.ObjectFactory;
/**
* Uses coffee script library loaded from the webjar to compile to javascript code.
*
* @author Alex Objelean
* @created 26 Mar 2011
* @since 1.3.6
*/
@SupportedResourceType(ResourceType.JS)
public class RhinoCoffeeScriptProcessor
implements ResourcePreProcessor, ResourcePostProcessor, Destroyable {
private static final Logger LOG = LoggerFactory.getLogger(RhinoCoffeeScriptProcessor.class);
public static final String ALIAS = "rhinoCoffeeScript";
private ObjectPoolHelper<CoffeeScript> enginePool;
public RhinoCoffeeScriptProcessor() {
enginePool = new ObjectPoolHelper<CoffeeScript>(new ObjectFactory<CoffeeScript>() {
@Override
public CoffeeScript create() {
return newCoffeeScript();
}
});
}
/**
* {@inheritDoc}
*/
@Override
public void process(final Resource resource, final Reader reader, final Writer writer)
throws IOException {
final String content = IOUtils.toString(reader);
final CoffeeScript coffeeScript = enginePool.getObject();
try {
writer.write(coffeeScript.compile(content));
} catch (final Exception e) {
onException(e);
final String resourceUri = resource == null ? StringUtils.EMPTY : "[" + resource.getUri() + "]";
LOG.error("Exception while applying " + getClass().getSimpleName() + " processor on the " + resourceUri
+ " resource, no processing applied...", e);
} finally {
reader.close();
writer.close();
enginePool.returnObject(coffeeScript);
}
}
/**
* Invoked when a processing exception occurs.
*/
protected void onException(final Exception e) {
throw WroRuntimeException.wrap(e);
}
/**
* @return the {@link CoffeeScript} engine implementation. Override it to provide a different version of the coffeeScript.js
* library. Useful for upgrading the processor outside the wro4j release.
*/
protected CoffeeScript newCoffeeScript() {
return new CoffeeScript();
}
/**
* {@inheritDoc}
*/
@Override
public void process(final Reader reader, final Writer writer)
throws IOException {
process(null, reader, writer);
}
@Override
public void destroy() throws Exception {
enginePool.destroy();
}
}