public Blob getBlob(final String container, final String key) {
BlobBuilder builder = blobBuilders.get();
builder.name(key);
File file = getFileForBlobKey(container, key);
Path path = file.toPath();
ByteSource byteSource = Files.asByteSource(file);
try {
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();
if (getFileStore(file.toPath()).supportsFileAttributeView(UserDefinedFileAttributeView.class)) {
UserDefinedFileAttributeView view = getFileAttributeView(path, UserDefinedFileAttributeView.class);
Set<String> attributes = ImmutableSet.copyOf(view.list());
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 (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)
.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();