Examples of ro.isdc.wro.model.resource.processor.ResourcePreProcessor

Package ro.isdc.wro.model.resource.processor

Examples of ro.isdc.wro.model.resource.processor.ResourcePreProcessor

ro.isdc.wro.model.resource.processor.ResourcePreProcessor
Perform actual processing of the resource content from the {@link Reader} and writes the processed content to the{@link Writer}. The processor should focus only on transformation. If a processing fails, it is preferred to propagate the exception, because wro4j can allow custom behavior for this situation. It is possible to treat the exceptions by leaving the processed output unchanged, but in this case you may not benefit of global configuration. @author Alex Objelean @created Created on Nov 19, 2008

  }


  @Test
  public void testFromFolder()
      throws Exception {
    final ResourcePreProcessor processor = new RhinoLessCssProcessor();
    final URL url = getClass().getResource("lesscss");


    final File testFolder = new File(url.getFile(), "test");
    final File expectedFolder = new File(url.getFile(), "expected");
    WroTestUtils.compareFromDifferentFoldersByExtension(testFolder, expectedFolder, "css", processor);

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   * Test that processing invalid less css produces exceptions
   */
  @Test
  public void shouldFailWhenInvalidLessCssIsProcessed()
      throws Exception {
    final ResourcePreProcessor processor = new RhinoLessCssProcessor() {
      @Override
      protected void onException(final WroRuntimeException e) {
        LOG.debug("[FAIL] Exception message is: {}", e.getMessage());
        throw e;
      };
    };
    final URL url = getClass().getResource("lesscss");


    final File testFolder = new File(url.getFile(), "invalid");
    WroTestUtils.forEachFileInFolder(testFolder, new Function<File, Void>() {
      @Override
      public Void apply(final File input)
          throws Exception {
        try {
          processor.process(null, new FileReader(input), new StringWriter());
          Assert.fail("Expected to fail, but didn't");
        } catch (final WroRuntimeException e) {
          // expected to throw exception, continue
        }
        return null;

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  }


  @Test
  public void shouldWorkProperlyWithCssImportPreProcessor()
      throws Exception {
    final ResourcePreProcessor processor = ChainedProcessor.create(initProcessor(new CssImportPreProcessor()),
        initProcessor((ResourcePreProcessor) new RhinoLessCssProcessor()));
    final URL url = getClass().getResource("lesscss");


    final File testFolder = new File(url.getFile(), "test");
    final File expectedFolder = new File(url.getFile(), "expectedUrlRewriting");

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        return getPreProcessorStrategies(provider);
      }
      
      @Override
      protected ResourcePreProcessor getStrategyForAlias(final String alias) {
        ResourcePreProcessor processor = super.getStrategyForAlias(alias);
        if (processor == null) {
          final String extension = FilenameUtils.getExtension(alias);
          boolean hasExtension = !StringUtils.isEmpty(extension);
          if (hasExtension) {
            final String processorName = FilenameUtils.getBaseName(alias);

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  @Test
  public void shouldApplyProcessor()
      throws Exception {
    final String processedMessage = "DONE";
    final List<ResourcePreProcessor> processors = new ArrayList<ResourcePreProcessor>();
    processors.add(new ResourcePreProcessor() {
      public void process(final Resource resource, final Reader reader, final Writer writer)
          throws IOException {
        writer.write(processedMessage);
      }
    });

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  @Test(expected = WroRuntimeException.class)
  public void shouldThrowExceptionWhenProcessorFails()
      throws Exception {
    final List<ResourcePreProcessor> processors = new ArrayList<ResourcePreProcessor>();
    processors.add(new ResourcePreProcessor() {
      public void process(final Resource resource, final Reader reader, final Writer writer)
          throws IOException {
        throw new WroRuntimeException("processor fails");
      }
    });

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   * @param groupName
   *          the name of the group being processed.
   * @return a processor used to detect changes in imported resources.
   */
  private ResourcePreProcessor createCssImportProcessor(final AtomicBoolean changeDetected, final String groupName) {
    final ResourcePreProcessor cssImportProcessor = new AbstractCssImportPreProcessor() {
      @Override
      protected void onImportDetected(final String importedUri) {
        LOG.debug("Found @import {}", importedUri);
        final boolean isImportChanged = isChanged(Resource.create(importedUri, ResourceType.CSS), groupName);
        LOG.debug("\tisImportChanged={}", isImportChanged);
        if (isImportChanged) {
          changeDetected.set(true);
          // we need to continue in order to store the hash for all imported resources, otherwise the change won't be
          // computed correctly.
        }
      };


      @Override
      protected String doTransform(final String cssContent, final List<Resource> foundImports)
          throws IOException {
        // no need to build the content, since we are interested in finding imported resources only
        return "";
      }


      @Override
      public String toString() {
        return CssImportPreProcessor.class.getSimpleName();
      }
    };
    /**
     * Ignore processor failure, since we are interesting in detecting change only. A failure is treated as lack of
     * change.
     */
    final ResourcePreProcessor processor = new ExceptionHandlingProcessorDecorator(cssImportProcessor) {
      @Override

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      }
    }
    if (!processors.isEmpty()) {
      Writer writer = null;
      for (final ResourcePreProcessor processor : processors) {
        final ResourcePreProcessor decoratedProcessor = decoratePreProcessor(processor, criteria);


        writer = new StringWriter();
        final Reader reader = new StringReader(resourceContent);
        // decorate and process
        decoratedProcessor.process(resource, reader, writer);
        // use the outcome for next input
        resourceContent = writer.toString();
      }
    }
    // add explicitly new line at the end to avoid unexpected comment issue

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   * Decorates preProcessor with mandatory decorators.
   * This method is synchronized to ensure that processor is injected before it is being used by other thread.
   */
  private synchronized ResourcePreProcessor decoratePreProcessor(final ResourcePreProcessor processor,
      final ProcessingCriteria criteria) {
    final ResourcePreProcessor decorated = new DefaultProcessorDecorator(processor, criteria) {
      @Override
      public void process(final Resource resource, final Reader reader, final Writer writer)
          throws IOException {
        try {
          callbackRegistry.onBeforePreProcess();

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    final Resource resource = Resource.create(cacheKey.getGroupName(), cacheKey.getType());


    Reader reader = new StringReader(content.toString());
    Writer writer = null;
    for (final ResourcePostProcessor processor : processors) {
      final ResourcePreProcessor decoratedProcessor = decorateProcessor(processor, cacheKey.isMinimize());
      writer = new StringWriter();
      decoratedProcessor.process(resource, reader, writer);
      reader = new StringReader(writer.toString());
    }
    return writer.toString();
  }

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