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

Introduction

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

Prototype

public HashCode hash(HashFunction hashFunction) throws IOException 

Source Link

Document

Hashes the contents of this byte source using the given hash function.

Usage

From source file:org.jclouds.kinetic.strategy.internal.KineticStorageStrategyImpl.java

private Blob createBlobFromByteSource(final String container, final String key, final ByteSource byteSource) {
    BlobBuilder builder = blobBuilders.get();
    builder.name(key);//from  w  w w  .j a v  a 2 s . c o  m
    File file = getFileForBlobKey(container, key);
    try {
        String cacheControl = null;
        String contentDisposition = null;
        String contentEncoding = null;
        String contentLanguage = null;
        String contentType = null;
        HashCode hashCode = null;
        Date expires = null;
        ImmutableMap.Builder<String, String> userMetadata = ImmutableMap.builder();

        UserDefinedFileAttributeView view = getUserDefinedFileAttributeView(file.toPath());
        if (view != null) {
            Set<String> attributes = ImmutableSet.copyOf(view.list());

            cacheControl = readStringAttributeIfPresent(view, attributes, XATTR_CACHE_CONTROL);
            contentDisposition = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_DISPOSITION);
            contentEncoding = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_ENCODING);
            contentLanguage = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_LANGUAGE);
            contentType = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_TYPE);
            if (contentType == null && autoDetectContentType) {
                contentType = probeContentType(file.toPath());
            }
            if (attributes.contains(XATTR_CONTENT_MD5)) {
                ByteBuffer buf = ByteBuffer.allocate(view.size(XATTR_CONTENT_MD5));
                view.read(XATTR_CONTENT_MD5, buf);
                hashCode = HashCode.fromBytes(buf.array());
            }
            if (attributes.contains(XATTR_EXPIRES)) {
                ByteBuffer buf = ByteBuffer.allocate(view.size(XATTR_EXPIRES));
                view.read(XATTR_EXPIRES, buf);
                buf.flip();
                expires = new Date(buf.asLongBuffer().get());
            }
            for (String attribute : attributes) {
                if (!attribute.startsWith(XATTR_USER_METADATA_PREFIX)) {
                    continue;
                }
                String value = readStringAttributeIfPresent(view, attributes, attribute);
                userMetadata.put(attribute.substring(XATTR_USER_METADATA_PREFIX.length()), value);
            }

            builder.payload(byteSource).cacheControl(cacheControl).contentDisposition(contentDisposition)
                    .contentEncoding(contentEncoding).contentLanguage(contentLanguage)
                    .contentLength(byteSource.size()).contentMD5(hashCode).contentType(contentType)
                    .expires(expires).userMetadata(userMetadata.build());
        } else {
            builder.payload(byteSource).contentLength(byteSource.size())
                    .contentMD5(byteSource.hash(Hashing.md5()).asBytes());
        }
    } catch (IOException e) {
        throw Throwables.propagate(e);
    }
    Blob blob = builder.build();
    blob.getMetadata().setContainer(container);
    blob.getMetadata().setLastModified(new Date(file.lastModified()));
    blob.getMetadata().setSize(file.length());
    if (blob.getPayload().getContentMetadata().getContentMD5() != null)
        blob.getMetadata()
                .setETag(base16().lowerCase().encode(blob.getPayload().getContentMetadata().getContentMD5()));
    return blob;
}

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