content: /**
   * Copyright Alex Objelean
   */
  package ro.isdc.wro.model.resource.processor.impl.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.model.group.processor.Minimize;
  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.ResourcePostProcessor;
  import ro.isdc.wro.model.resource.processor.ResourcePreProcessor;
  import ro.isdc.wro.model.resource.processor.support.JawrCssMinifier;
  
  
  /**
   * A processor implementation   using {@link JawrCssMinifier} algorithm. This processor can be used as both: PreProcessor
   * & postProcessor. <br/>
   * This processor is annotated with {@link Minimize} because it performs minimization.
   *
   * @author Alex Objelean
   */
  @Minimize
  @SupportedResourceType(ResourceType.CSS)
  public class JawrCssMinifierProcessor
    implements ResourcePreProcessor, ResourcePostProcessor {
    private static final Logger LOG = LoggerFactory.getLogger(JawrCssMinifierProcessor.class);
    public static final String ALIAS = "cssMinJawr";  
    /**
     * {@inheritDoc}
     */
    public void process(final Reader reader, final Writer writer)
      throws IOException {
      process(null, reader, writer);
    }
  
  
    /**
     * {@inheritDoc}
     */
    public void process(final Resource resource, final Reader reader, final Writer writer)
      throws IOException {
      try {
        final String content = IOUtils.toString(reader);
        final StringBuffer result = new JawrCssMinifier().minifyCSS(new StringBuffer(content));
        writer.write(result.toString());
        writer.flush();
      } catch (final Exception e) {
        final String resourceUri = resource == null ? StringUtils.EMPTY : "[" + resource.getUri() + "]";
        String message = "Exception while applying " + getClass().getSimpleName() + " processor on the "
            + resourceUri + " resource";
        LOG.error(message, e);
        throw new IOException(message);
      } finally {
        reader.close();
        writer.close();
      }
    }
  }
  