Examples of javax.ws.rs.ext.MessageBodyWriter.writeTo()

javax.ws.rs.ext.MessageBodyWriter.writeTo()
Write a type to an HTTP response. The response header map is mutable but any changes must be made before writing to the output stream since the headers will be flushed prior to writing the response body. @param t the instance to write. @param type the class of object that is to be written. @param genericType the type of object to be written, obtained eitherby reflection of a resource method return type or by inspection of the returned instance. {@link javax.ws.rs.core.GenericEntity}provides a way to specify this information at runtime. @param annotations an array of the annotations on the resourcemethod that returns the object. @param mediaType the media type of the HTTP entity. @param httpHeaders a mutable map of the HTTP response headers. @param entityStream the {@link OutputStream} for the HTTP entity. Theimplementation should not close the output stream. @throws java.io.IOException if an IO error arises @throws javax.ws.rs.WebApplicationException if a specific HTTP error response needs to be produced. Only effective if thrown prior to the response being committed.

            try {
                LOG.fine("Response EntityProvider is: " + writer.getClass().getName());
                MediaType mt = computeFinalContentTypes(availableContentTypes, writer);
                LOG.fine("Response content type is: " + mt.toString());
                message.put(Message.CONTENT_TYPE, mt.toString());
                writer.writeTo(responseObj, mt, null, out);
            } catch (IOException e) {
                e.printStackTrace();
                message.put(Message.RESPONSE_CODE, 500);
                writeResponseErrorMessage(out, "SERIALIZE_ERROR", 
                                          responseObj.getClass().getSimpleName());

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        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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            }
            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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    @SuppressWarnings("unchecked")
    @Test
    public void testWriteTo() throws Exception {
        MessageBodyWriter p = new BinaryDataProvider();
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        p.writeTo(new byte[]{'h', 'i'}, null, null, null, null, null, os);
        assertTrue(Arrays.equals(new String("hi").getBytes(), os.toByteArray()));
        ByteArrayInputStream is = new ByteArrayInputStream("hi".getBytes());
        os = new ByteArrayOutputStream();
        p.writeTo(is, null, null, null, null, null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));

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        ByteArrayOutputStream os = new ByteArrayOutputStream();
        p.writeTo(new byte[]{'h', 'i'}, null, null, null, null, null, os);
        assertTrue(Arrays.equals(new String("hi").getBytes(), os.toByteArray()));
        ByteArrayInputStream is = new ByteArrayInputStream("hi".getBytes());
        os = new ByteArrayOutputStream();
        p.writeTo(is, null, null, null, null, null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));
        
        Reader r = new StringReader("hi");
        os = new ByteArrayOutputStream();
        p.writeTo(r, null, null, null, MediaType.valueOf("text/xml"), null, os);

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        p.writeTo(is, null, null, null, null, null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));
        
        Reader r = new StringReader("hi");
        os = new ByteArrayOutputStream();
        p.writeTo(r, null, null, null, MediaType.valueOf("text/xml"), null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));
        
        os = new ByteArrayOutputStream();
        p.writeTo(new StreamingOutputImpl(), null, null, null, 
                  MediaType.valueOf("text/xml"), null, os);

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        os = new ByteArrayOutputStream();
        p.writeTo(r, null, null, null, MediaType.valueOf("text/xml"), null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));
        
        os = new ByteArrayOutputStream();
        p.writeTo(new StreamingOutputImpl(), null, null, null, 
                  MediaType.valueOf("text/xml"), null, os);
        assertTrue(Arrays.equals(os.toByteArray(), new String("hi").getBytes()));
    }

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                responseType = checkFinalContentType(responseType);
                LOG.fine("Response content type is: " + responseType.toString());
                message.put(Message.CONTENT_TYPE, responseType.toString());
                
                LOG.fine("Response EntityProvider is: " + writer.getClass().getName());
                writer.writeTo(responseObj, targetType, invoked.getGenericReturnType(), 
                               invoked != null ? invoked.getAnnotations() : new Annotation[]{}, 
                               responseType, 
                               response.getMetadata(), 
                               out);

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    @SuppressWarnings("unchecked")
    @Test
    public void testWriteBoolean() throws Exception {
        MessageBodyWriter p = new PrimitiveTextProvider();
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        p.writeTo(Boolean.TRUE, null, null, null, MediaType.TEXT_PLAIN_TYPE, null, os);
        assertTrue(Arrays.equals(new String("true").getBytes(), os.toByteArray()));
        
        os = new ByteArrayOutputStream();
        
        final boolean value = true;

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        assertTrue(Arrays.equals(new String("true").getBytes(), os.toByteArray()));
        
        os = new ByteArrayOutputStream();
        
        final boolean value = true;
        p.writeTo(value, null, null, null, MediaType.TEXT_PLAIN_TYPE, null, os);
        assertTrue(Arrays.equals(new String("true").getBytes(), os.toByteArray()));
    }
    
    
    @SuppressWarnings("unchecked")

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