public <T> byte[] toBytes(MediaType mediaType, T o) throws IOException {
if (o == null) {
return null;
}
Class<T> clazz = (Class<T>) o.getClass();
MessageBodyWriter<T> writer = findWriter(clazz, null, EMPTY_ANNOTATIONS, mediaType);
if (writer == null) {
throw new IllegalArgumentException(
"cannot convert " + clazz.getName() + " into byte[] (" + mediaType + ")");
}
ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
writer.writeTo(o, clazz, clazz, EMPTY_ANNOTATIONS, mediaType, EMPTY_OBJECT_HEADERS, baos);
return baos.toByteArray();
}
@SuppressWarnings("unchecked")
public void writeBody(GenericContainerResponse response, MessageBodyWriter entityWriter)
throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
Object entity = response.getEntity();
if (entity != null) {
entityWriter.writeTo(
entity,
entity.getClass(),
response.getEntityType(),
null,
response.getContentType(),
response.getHttpHeaders(),
out);
body = out.toByteArray();
}
}
/**
* Write the response.
*
* <p>The status and headers will be written by calling the method {@link
* ContainerResponseWriter#writeStatusAndHeaders} on the provided {@link ContainerResponseWriter}
* instance. The {@link OutputStream} returned from that method call is used to write the entity
* (if any) to that {@link OutputStream}. An appropriate {@link MessageBodyWriter} will be found
* to write the entity.
*
* @throws WebApplicationException if {@link MessageBodyWriter} cannot be found for the entity
* with a 500 (Internal Server error) response.
* @throws java.io.IOException if there is an error writing the entity
*/
public void write() throws IOException {
if (isCommitted) return;
if (request.isTracingEnabled()) {
configureTrace(responseWriter);
}
if (entity == null) {
isCommitted = true;
responseWriter.writeStatusAndHeaders(-1, this);
responseWriter.finish();
return;
}
if (!getHttpHeaders().containsKey(HttpHeaders.VARY)) {
final String varyHeader = (String) request.getProperties().get(ContainerRequest.VARY_HEADER);
if (varyHeader != null) {
getHttpHeaders().add(HttpHeaders.VARY, varyHeader);
}
}
MediaType contentType = getMediaType();
if (contentType == null) {
contentType =
getMessageBodyWorkers()
.getMessageBodyWriterMediaType(
entity.getClass(), entityType, annotations, request.getAcceptableMediaTypes());
if (contentType == null || contentType.isWildcardType() || contentType.isWildcardSubtype())
contentType = MediaType.APPLICATION_OCTET_STREAM_TYPE;
getHttpHeaders().putSingle(HttpHeaders.CONTENT_TYPE, contentType);
}
final MessageBodyWriter p =
getMessageBodyWorkers()
.getMessageBodyWriter(entity.getClass(), entityType, annotations, contentType);
if (p == null) {
String message =
"A message body writer for Java class "
+ entity.getClass().getName()
+ ", and Java type "
+ entityType
+ ", and MIME media type "
+ contentType
+ " was not found";
LOGGER.severe(message);
Map<MediaType, List<MessageBodyWriter>> m = getMessageBodyWorkers().getWriters(contentType);
LOGGER.severe(
"The registered message body writers compatible with the MIME media type are:\n"
+ getMessageBodyWorkers().writersToString(m));
if (request.getMethod().equals("HEAD")) {
isCommitted = true;
responseWriter.writeStatusAndHeaders(-1, this);
responseWriter.finish();
return;
} else {
throw new WebApplicationException(new MessageException(message), 500);
}
}
final long size = p.getSize(entity, entity.getClass(), entityType, annotations, contentType);
if (request.getMethod().equals("HEAD")) {
if (size != -1) getHttpHeaders().putSingle(HttpHeaders.CONTENT_LENGTH, Long.toString(size));
isCommitted = true;
responseWriter.writeStatusAndHeaders(0, this);
} else {
if (request.isTracingEnabled()) {
request.trace(
String.format(
"matched message body writer: %s, \"%s\" -> %s",
ReflectionHelper.objectToString(entity),
contentType,
ReflectionHelper.objectToString(p)));
}
if (out == null) out = new CommittingOutputStream(size);
p.writeTo(
entity, entity.getClass(), entityType, annotations, contentType, getHttpHeaders(), out);
if (!isCommitted) {
isCommitted = true;
responseWriter.writeStatusAndHeaders(-1, this);
}
}
responseWriter.finish();
}