content: /*
   * Copyright (c) 2008. All rights reserved.
   */
  package ro.isdc.wro.model.resource.processor.impl;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  import java.util.regex.Pattern;
  
  import org.apache.commons.io.IOUtils;
  
  import ro.isdc.wro.model.resource.Resource;
  import ro.isdc.wro.model.resource.processor.ResourcePostProcessor;
  import ro.isdc.wro.model.resource.processor.ResourcePreProcessor;
  import ro.isdc.wro.util.WroUtil;
  
  
  /**
   * SingleLineCommentStripperProcessor can be both: preProcessor & postProcessor. Remove single line comments from
   * processed resource. This processor exist only for the sake of proof of concept.
   *
   * @author Alex Objelean
   * @created Created on Nov 28, 2008
   */
  public class SingleLineCommentStripperProcessor
    implements ResourcePreProcessor, ResourcePostProcessor {
    /**
     * Pattern containing a regex matching singleline comments & preceding empty spaces & tabs.
     */
    public static final Pattern PATTERN = Pattern.compile(WroUtil.loadRegexpWithKey("comment.singleline"),
        Pattern.MULTILINE);
    public static final String ALIAS = "singlelineStripper";
  
    /**
     * {@inheritDoc}
     */
    public void process(final Resource resource, final Reader reader, final Writer writer)
      throws IOException {
      try {
        final String content = IOUtils.toString(reader);
        String result = PATTERN.matcher(content).replaceAll("");
        result = WroUtil.EMTPY_LINE_PATTERN.matcher(result).replaceAll("");
        writer.write(result);
      } finally {
        reader.close();
        writer.close();
      }
    }
  
  
    /**
     * {@inheritDoc}
     */
    public void process(final Reader reader, final Writer writer)
      throws IOException {
      // resource Uri doesn't matter.
      process(null, reader, writer);
    }
  }
  