content: /*
   * 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.uglify.UglifyJs;
  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;
  
  
  /**
   * Perform a beautify operation on javascript by nicely formatting it.
   *
   * @author Alex Objelean
   * @since 1.3.1
   * @created 7 Nov 2010
   */
  @SupportedResourceType(ResourceType.JS)
  public class BeautifyJsProcessor
    implements ResourcePreProcessor, ResourcePostProcessor, Destroyable {
    private static final Logger LOG = LoggerFactory.getLogger(BeautifyJsProcessor.class);
    public static final String ALIAS_BEAUTIFY = "beautifyJs";
    /**
     * Engine.
     */
    private final ObjectPoolHelper<UglifyJs> enginePool;
  
  
    /**
     * Default constructor. Instantiates uglifyJs engine.
     */
    public BeautifyJsProcessor() {
      enginePool = new ObjectPoolHelper<UglifyJs>(new ObjectFactory<UglifyJs>() {
        @Override
        public UglifyJs create() {
          return newEngine();
        }
      });
    }
  
  
    /**
     * @return new instance of {@link UglifyJs} engine.
     */
    protected UglifyJs newEngine() {
      return UglifyJs.beautifyJs();
    }
  
  
    /**
     * {@inheritDoc}
     */
    @Override
    public void process(final Resource resource, final Reader reader, final Writer writer)
      throws IOException {
      final String content = IOUtils.toString(reader);
      final UglifyJs engine = enginePool.getObject();
      try {
        final String filename = resource == null ? "noName.js" : resource.getUri();
        writer.write(engine.process(filename, 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.
     */
    protected void onException(final WroRuntimeException e) {
      throw e;
    }
  
  
    /**
     * {@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();
    }
  }
  