/*
* Copyright (c) 2012. All rights reserved.
*/
package ro.isdc.wro.extensions.processor.css;
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.sass.RubySassEngine;
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;
/**
* A processor using the ruby sass engine:
*
* @author Simon van der Sluis
* @since 1.4.6
* @created 2/03/12
*/
@SupportedResourceType(ResourceType.CSS)
public class RubySassCssProcessor
implements ResourcePreProcessor, ResourcePostProcessor, Destroyable {
private static final Logger LOG = LoggerFactory.getLogger(RubySassCssProcessor.class);
public static final String ALIAS = "rubySassCss";
private ObjectPoolHelper<RubySassEngine> enginePool;
public RubySassCssProcessor() {
enginePool = new ObjectPoolHelper<RubySassEngine>(new ObjectFactory<RubySassEngine>() {
@Override
public RubySassEngine create() {
return newEngine();
}
});
}
/**
* {@inheritDoc}
*/
@Override
public void process(final Resource resource, final Reader reader, final Writer writer)
throws IOException {
final String content = IOUtils.toString(reader);
final RubySassEngine engine = enginePool.getObject();
try {
writer.write(engine.process(content));
} catch (final WroRuntimeException e) {
onException(e);
final String resourceUri = resource == null ? StringUtils.EMPTY : "[" + resource.getUri() + "]";
LOG.warn("Exception while applying " + getClass().getSimpleName() + " processor on the " + resourceUri
+ " resource, no processing applied...", e);
} finally {
reader.close();
writer.close();
enginePool.returnObject(engine);
}
}
/**
* Invoked when a processing exception occurs. By default propagates the runtime exception.
*/
protected void onException(final WroRuntimeException e) {
throw e;
}
/**
* A getter used for lazy loading.
* @deprecated use {@link #newEngine()} instead.
*/
@Deprecated
protected RubySassEngine getEngine() {
return newEngine();
}
/**
* @return a fresh instance of {@link RubySassEngine}
*/
protected RubySassEngine newEngine() {
return new RubySassEngine();
}
/**
* {@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();
}
}