Example usage for com.google.common.io ByteSource slice

Introduction

In this page you can find the example usage for com.google.common.io ByteSource slice.

Prototype

public ByteSource slice(long offset, long length) 

Source Link

Document

Returns a view of a slice of this byte source that is at most length bytes long starting at the given offset .

Usage

From source file:de.l3s.concatgz.util.CacheInputStream.java

public InputStream getCacheStream() throws IOException {
    ByteSource cachedBytes = cache.asByteSource();
    InputStream cachedStream = cachedBytes.slice(0, cachedBytes.size() - bufferLeft).openBufferedStream();
    return new SequenceInputStream(cachedStream, this);
}

---

From source file:org.haiku.haikudepotserver.support.web.JobDataWriteListener.java

@Override
public void onWritePossible() throws IOException {
    Optional<JobDataWithByteSource> jobDataWithByteSourceOptional = jobService.tryObtainData(jobDataGuid);

    if (!jobDataWithByteSourceOptional.isPresent()) {
        LOGGER.error("unable to find the job data for; " + jobDataGuid);
        async.complete();// w ww  . j  a va 2  s  . co  m
    } else {
        ByteSource byteSource = jobDataWithByteSourceOptional.get().getByteSource();

        while (payloadOffset >= 0 && outputStream.isReady()) {
            ByteSource subPayloadByteStream = byteSource.slice(payloadOffset, BUFFER_SIZE);
            int subPayloadBufferFillLength = readToBuffer(subPayloadByteStream);

            if (0 == subPayloadBufferFillLength) {
                async.complete();
                LOGGER.info("did complete async stream job data; {}", jobDataGuid);
                payloadOffset = -1;
            } else {
                outputStream.write(subPayloadBuffer, 0, subPayloadBufferFillLength);
                payloadOffset += subPayloadBufferFillLength;
            }
        }
    }
}

---

From source file:org.codice.ddf.security.crl.generator.CrlGenerator.java

/**
 * Determines the CRL encoding and creates a CRL file.
 *
 * @param byteSource - CRL content as a byte source
 * @return - the created file//from  w  w  w  . ja  v  a  2  s. co m
 * @throws IOException
 */
private File getCrlFile(ByteSource byteSource) throws IOException {
    // Determine the file extension
    File crlFile;
    try (InputStream inputStream = byteSource.slice(0, 300).openStream()) {
        if (IOUtils.toString(inputStream, StandardCharsets.UTF_8).contains("-----BEGIN")) {
            crlFile = new File(crlFileLocation + PEM_CRL);
        } else {
            crlFile = new File(crlFileLocation + DEM_CRL);
        }
    }
    return crlFile;
}

---

From source file:org.jclouds.blobstore.config.LocalBlobStore.java

@Override
public Blob getBlob(String containerName, String key, GetOptions options) {
    logger.debug("Retrieving blob with key %s from container %s", key, containerName);
    // If the container doesn't exist, an exception is thrown
    if (!storageStrategy.containerExists(containerName)) {
        logger.debug("Container %s does not exist", containerName);
        throw cnfe(containerName);
    }//from w ww.j  a  va 2  s.c  om
    // If the blob doesn't exist, a null object is returned
    if (!storageStrategy.blobExists(containerName, key)) {
        logger.debug("Item %s does not exist in container %s", key, containerName);
        return null;
    }

    Blob blob = loadBlob(containerName, key);

    if (options != null) {
        String eTag = blob.getMetadata().getETag();
        if (eTag != null) {
            eTag = maybeQuoteETag(eTag);
            if (options.getIfMatch() != null) {
                if (!eTag.equals(maybeQuoteETag(options.getIfMatch())))
                    throw returnResponseException(412);
            }
            if (options.getIfNoneMatch() != null) {
                if (eTag.equals(maybeQuoteETag(options.getIfNoneMatch())))
                    throw returnResponseException(304);
            }
        }
        if (options.getIfModifiedSince() != null) {
            Date modifiedSince = options.getIfModifiedSince();
            if (blob.getMetadata().getLastModified().before(modifiedSince)) {
                HttpResponse response = HttpResponse.builder().statusCode(304).build();
                throw new HttpResponseException(String.format("%1$s is before %2$s",
                        blob.getMetadata().getLastModified(), modifiedSince), null, response);
            }

        }
        if (options.getIfUnmodifiedSince() != null) {
            Date unmodifiedSince = options.getIfUnmodifiedSince();
            if (blob.getMetadata().getLastModified().after(unmodifiedSince)) {
                HttpResponse response = HttpResponse.builder().statusCode(412).build();
                throw new HttpResponseException(String.format("%1$s is after %2$s",
                        blob.getMetadata().getLastModified(), unmodifiedSince), null, response);
            }
        }
        blob = copyBlob(blob);

        if (options.getRanges() != null && !options.getRanges().isEmpty()) {
            long size = 0;
            ImmutableList.Builder<ByteSource> streams = ImmutableList.builder();

            // Try to convert payload to ByteSource, otherwise wrap it.
            ByteSource byteSource;
            try {
                byteSource = (ByteSource) blob.getPayload().getRawContent();
            } catch (ClassCastException cce) {
                try {
                    byteSource = ByteSource
                            .wrap(ByteStreams2.toByteArrayAndClose(blob.getPayload().openStream()));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }

            for (String s : options.getRanges()) {
                // HTTP uses a closed interval while Java array indexing uses a
                // half-open interval.
                long offset = 0;
                long last = blob.getPayload().getContentMetadata().getContentLength() - 1;
                if (s.startsWith("-")) {
                    offset = last - Long.parseLong(s.substring(1)) + 1;
                    if (offset < 0) {
                        offset = 0;
                    }
                } else if (s.endsWith("-")) {
                    offset = Long.parseLong(s.substring(0, s.length() - 1));
                } else if (s.contains("-")) {
                    String[] firstLast = s.split("\\-");
                    offset = Long.parseLong(firstLast[0]);
                    last = Long.parseLong(firstLast[1]);
                } else {
                    throw new IllegalArgumentException("illegal range: " + s);
                }

                if (offset >= blob.getPayload().getContentMetadata().getContentLength()) {
                    throw new IllegalArgumentException("illegal range: " + s);
                }
                if (last + 1 > blob.getPayload().getContentMetadata().getContentLength()) {
                    last = blob.getPayload().getContentMetadata().getContentLength() - 1;
                }
                streams.add(byteSource.slice(offset, last - offset + 1));
                size += last - offset + 1;
                blob.getAllHeaders().put(HttpHeaders.CONTENT_RANGE, "bytes " + offset + "-" + last + "/"
                        + blob.getPayload().getContentMetadata().getContentLength());
            }
            ContentMetadata cmd = blob.getPayload().getContentMetadata();
            blob.setPayload(ByteSource.concat(streams.build()));
            HttpUtils.copy(cmd, blob.getPayload().getContentMetadata());
            blob.getPayload().getContentMetadata().setContentLength(size);
            blob.getMetadata().setSize(size);
        }
    }
    checkNotNull(blob.getPayload(), "payload " + blob);
    return blob;
}

---