Examples of javax.ws.rs.ext.MessageBodyWriter

javax.ws.rs.ext.MessageBodyWriter
Contract for a provider that supports the conversion of a Java type to a stream. To add a MessageBodyWriter implementation, annotate the implementation class with @Provider.
A MessageBodyWriter implementation may be annotated with {@link javax.ws.rs.Produces} to restrict the media types for which it willbe considered suitable. @param T the type that can be written @see Provider @see javax.ws.rs.Produces

        MediaType mType = MediaType.valueOf(mediaType);
        
        MessageBodyReader reader = pf.createMessageBodyReader(type, type, null, mType, new MessageImpl());
        assertSame("Unexpected provider found", provider, reader.getClass());
    
        MessageBodyWriter writer = pf.createMessageBodyWriter(type, type, null, mType, new MessageImpl());
        assertTrue("Unexpected provider found", provider == writer.getClass());
    }

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            return;
        }
        
        MediaType contentType = MediaType.valueOf(headers.getFirst("Content-Type")); 
        
        MessageBodyWriter mbw = ProviderFactory.getInstance(m).createMessageBodyWriter(
            cls, type, anns, contentType, m);
        if (mbw == null) {
            mbw = ProviderFactory.getInstance().createMessageBodyWriter(
                      cls, type, anns, contentType, m);
        }
        if (mbw != null) {
            try {
                mbw.writeTo(o, cls, type, anns, contentType, headers, os);
                os.flush();
            } catch (Exception ex) {
                throw new WebApplicationException();
            }

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      Class<?> type,
      Type genericType,
      MultivaluedMap<String, Object> httpHeaders,
      MediaType mediaType) throws IOException {
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    MessageBodyWriter writer =
        providers.getMessageBodyWriter(type, genericType, null, mediaType);
    if (writer == null) {
      return null;
    }
    writer.writeTo(object, type, genericType, new Annotation[0], mediaType, httpHeaders, os);
    String contentString = os.toString(getCharset(mediaType));
    return contentString;
  }

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    private static class MessageBodyWriterComparator 
        implements Comparator<ProviderInfo<MessageBodyWriter>> {
        
        public int compare(ProviderInfo<MessageBodyWriter> p1, 
                           ProviderInfo<MessageBodyWriter> p2) {
            MessageBodyWriter e1 = p1.getProvider();
            MessageBodyWriter e2 = p2.getProvider();
            
            List<MediaType> types1 =
                JAXRSUtils.sortMediaTypes(JAXRSUtils.getProviderProduceTypes(e1));
            List<MediaType> types2 =
                JAXRSUtils.sortMediaTypes(JAXRSUtils.getProviderProduceTypes(e2));

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                                                       (TypeVariable)genericType);
        }
        
        Annotation[] annotations = invoked != null ? invoked.getAnnotations() : new Annotation[]{};
        
        MessageBodyWriter writer = null;
        MediaType responseType = null;
        for (MediaType type : availableContentTypes) { 
            writer = ProviderFactory.getInstance(message)
                .createMessageBodyWriter(targetType, genericType, annotations, type, message);
            
            if (writer != null) {
                responseType = type;
                break;
            }
        }
    
        OutputStream outOriginal = message.getContent(OutputStream.class);
        if (writer == null) {
            message.put(Message.CONTENT_TYPE, "text/plain");
            message.put(Message.RESPONSE_CODE, 500);
            writeResponseErrorMessage(outOriginal, "NO_MSG_WRITER", targetType.getSimpleName());
            return;
        }
        boolean enabled = checkBufferingMode(message, writer, firstTry);
        Object entity = getEntity(responseObj);
        try {
            responseType = checkFinalContentType(responseType);
            if (LOG.isLoggable(Level.FINE)) {
                LOG.fine("Response content type is: " + responseType.toString());
            }
            message.put(Message.CONTENT_TYPE, responseType.toString());
            
            long size = writer.getSize(entity, targetType, genericType, annotations, responseType);
            if (size > 0) {
                LOG.fine("Setting ContentLength to " + size + " as requested by " 
                         + writer.getClass().getName());
                responseHeaders.putSingle(HttpHeaders.CONTENT_LENGTH, Long.toString(size));
            }
            if (LOG.isLoggable(Level.FINE)) {
                LOG.fine("Response EntityProvider is: " + writer.getClass().getName());
            }
            try {
                writer.writeTo(entity, targetType, genericType, 
                               annotations, 
                               responseType, 
                               responseHeaders, 
                               message.getContent(OutputStream.class));

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            return;
        }
        
        MediaType contentType = MediaType.valueOf(headers.getFirst("Content-Type")); 
        
        MessageBodyWriter mbw = ProviderFactory.getInstance(outMessage).createMessageBodyWriter(
            cls, type, anns, contentType, outMessage);
        if (mbw != null) {
            try {
                mbw.writeTo(o, cls, type, anns, contentType, headers, os);
                if (os != null) {
                    os.flush();
                }
            } catch (Exception ex) {
                reportMessageHandlerProblem("MSG_WRITER_PROBLEM", cls, contentType, ex, null);

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    private static class MessageBodyWriterComparator 
        implements Comparator<ProviderInfo<MessageBodyWriter>> {
        
        public int compare(ProviderInfo<MessageBodyWriter> p1, 
                           ProviderInfo<MessageBodyWriter> p2) {
            MessageBodyWriter e1 = p1.getProvider();
            MessageBodyWriter e2 = p2.getProvider();
            
            List<MediaType> types1 =
                JAXRSUtils.sortMediaTypes(JAXRSUtils.getProviderProduceTypes(e1));
            List<MediaType> types2 =
                JAXRSUtils.sortMediaTypes(JAXRSUtils.getProviderProduceTypes(e2));

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        MediaType mType = MediaType.valueOf(mediaType);
        
        MessageBodyReader reader = pf.createMessageBodyReader(type, type, null, mType, new MessageImpl());
        assertSame("Unexpected provider found", provider, reader.getClass());
    
        MessageBodyWriter writer = pf.createMessageBodyWriter(type, type, null, mType, new MessageImpl());
        assertTrue("Unexpected provider found", provider == writer.getClass());
    }

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        MessageBodyReader customJaxbReader2 = pf.createMessageBodyReader((Class<?>)Book.class, null, null, 
                                                              MediaType.TEXT_XML_TYPE, message);
        assertSame(customJaxbReader, customJaxbReader2);
         
        MessageBodyWriter customJaxbWriter = pf.createMessageBodyWriter((Class<?>)Book.class, null, null, 
                                                              MediaType.TEXT_XML_TYPE, message);
        assertSame(customJaxbReader, customJaxbWriter);
        
        MessageBodyReader jaxbReader = ProviderFactory.getSharedInstance().createMessageBodyReader(
            (Class<?>)Book.class, null, null, MediaType.TEXT_XML_TYPE, message);

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        pf.registerUserProvider(provider);
        MessageBodyReader customJaxbReader = pf.createMessageBodyReader((Class<?>)Book.class, null, null, 
                                                              MediaType.TEXT_XML_TYPE, new MessageImpl());
        assertSame(customJaxbReader, provider);
        
        MessageBodyWriter customJaxbWriter = pf.createMessageBodyWriter((Class<?>)Book.class, null, null, 
                                                              MediaType.TEXT_XML_TYPE, new MessageImpl());
        assertSame(customJaxbWriter, provider);
    }

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