Examples with ServiceException gov.ca.cwds.rest.services.ServiceException used on opensource projects

Example 51 with ServiceException

use of gov.ca.cwds.rest.services.ServiceException in project API by ca-cwds.

the class CmsDocumentDao method decompressLZW.

/**
   * Decompress (inflate) an LZW-compressed document by assembling blob segments and calling native
   * library.
   * 
   * @param doc LZW archive to decompress
   * @return base64-encoded String of decompressed document
   */
protected String decompressLZW(gov.ca.cwds.data.persistence.cms.CmsDocument doc) {
    String retval = "";
    try {
        File src = File.createTempFile("src", ".lzw");
        src.deleteOnExit();
        File tgt = File.createTempFile("tgt", ".doc");
        tgt.deleteOnExit();
        FileOutputStream fos = new FileOutputStream(src);
        for (CmsDocumentBlobSegment seg : doc.getBlobSegments()) {
            final byte[] bytes = DatatypeConverter.parseHexBinary(seg.getDocBlob().trim());
            fos.write(bytes, 0, bytes.length);
        }
        fos.flush();
        fos.close();
        // DECOMPRESS!
        // TODO: Trap std::exception in shared library and return error code.
        // The LZW library currently returns a blank when decompression fails, for safety, since
        // unhandled C++ exceptions kill the JVM.
        LZWEncoder lzw = new LZWEncoder();
        lzw.fileCopyUncompress(src.getAbsolutePath(), tgt.getAbsolutePath());
        retval = DatatypeConverter.printBase64Binary(Files.readAllBytes(Paths.get(tgt.getAbsolutePath())));
        // For security reasons, remove temporary documents immediately.
        // TODO: pass bytes to C++ library instead of file names.
        src.delete();
        tgt.delete();
    } catch (Exception e) {
        LOGGER.error("ERROR DECOMPRESSING LZW! " + e.getMessage(), e);
        throw new ServiceException("ERROR DECOMPRESSING LZW! " + e.getMessage(), e);
    }
    return retval;
}