Example usage for org.springframework.web.servlet.resource TransformedResource TransformedResource

Introduction

In this page you can find the example usage for org.springframework.web.servlet.resource TransformedResource TransformedResource.

Prototype

public TransformedResource(Resource original, byte[] transformedContent) 

Source Link

Usage

From source file:org.springframework.web.servlet.resource.AppCacheManifestTransfomer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {
    resource = transformerChain.transform(request, resource);

    String filename = resource.getFilename();
    if (!this.fileExtension.equals(StringUtils.getFilenameExtension(filename))) {
        return resource;
    }//w  w  w  . jav a  2  s  .c o m

    byte[] bytes = FileCopyUtils.copyToByteArray(resource.getInputStream());
    String content = new String(bytes, DEFAULT_CHARSET);

    if (!content.startsWith(MANIFEST_HEADER)) {
        if (logger.isTraceEnabled()) {
            logger.trace("AppCache manifest does not start with 'CACHE MANIFEST', skipping: " + resource);
        }
        return resource;
    }

    if (logger.isTraceEnabled()) {
        logger.trace("Transforming resource: " + resource);
    }

    StringWriter contentWriter = new StringWriter();
    HashBuilder hashBuilder = new HashBuilder(content.length());

    Scanner scanner = new Scanner(content);
    SectionTransformer currentTransformer = this.sectionTransformers.get(MANIFEST_HEADER);
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if (this.sectionTransformers.containsKey(line.trim())) {
            currentTransformer = this.sectionTransformers.get(line.trim());
            contentWriter.write(line + "\n");
            hashBuilder.appendString(line);
        } else {
            contentWriter
                    .write(currentTransformer.transform(line, hashBuilder, resource, transformerChain) + "\n");
        }
    }

    String hash = hashBuilder.build();
    contentWriter.write("\n" + "# Hash: " + hash);
    if (logger.isTraceEnabled()) {
        logger.trace("AppCache file: [" + resource.getFilename() + "] Hash: [" + hash + "]");
    }

    return new TransformedResource(resource, contentWriter.toString().getBytes(DEFAULT_CHARSET));
}

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From source file:org.springframework.web.servlet.resource.CssLinkResourceTransformer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {

    resource = transformerChain.transform(request, resource);

    String filename = resource.getFilename();
    if (!"css".equals(StringUtils.getFilenameExtension(filename))
            || resource instanceof GzipResourceResolver.GzippedResource) {
        return resource;
    }/*from   w  w w .j  a va2 s  .  c  o m*/

    if (logger.isTraceEnabled()) {
        logger.trace("Transforming resource: " + resource);
    }

    byte[] bytes = FileCopyUtils.copyToByteArray(resource.getInputStream());
    String content = new String(bytes, DEFAULT_CHARSET);

    SortedSet<ContentChunkInfo> links = new TreeSet<>();
    for (LinkParser parser : this.linkParsers) {
        parser.parse(content, links);
    }

    if (links.isEmpty()) {
        if (logger.isTraceEnabled()) {
            logger.trace("No links found.");
        }
        return resource;
    }

    int index = 0;
    StringWriter writer = new StringWriter();
    for (ContentChunkInfo linkContentChunkInfo : links) {
        writer.write(content.substring(index, linkContentChunkInfo.getStart()));
        String link = content.substring(linkContentChunkInfo.getStart(), linkContentChunkInfo.getEnd());
        String newLink = null;
        if (!hasScheme(link)) {
            String absolutePath = toAbsolutePath(link, request);
            newLink = resolveUrlPath(absolutePath, request, resource, transformerChain);
        }
        if (logger.isTraceEnabled()) {
            if (newLink != null && !newLink.equals(link)) {
                logger.trace("Link modified: " + newLink + " (original: " + link + ")");
            } else {
                logger.trace("Link not modified: " + link);
            }
        }
        writer.write(newLink != null ? newLink : link);
        index = linkContentChunkInfo.getEnd();
    }
    writer.write(content.substring(index));

    return new TransformedResource(resource, writer.toString().getBytes(DEFAULT_CHARSET));
}

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