Examples with JsonGenerator javax.json.stream.JsonGenerator used on opensource projects

Example 11 with JsonGenerator

use of javax.json.stream.JsonGenerator in project sling by apache.

the class MDCStateServlet method doGet.

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    PrintWriter pw = resp.getWriter();
    if (req.getParameter("createTestConfig") != null) {
        createTestConfig();
        pw.print("created");
        return;
    }
    Map<String, String> copyOfContextMap = MDC.getCopyOfContextMap();
    JsonGenerator json = Json.createGenerator(pw);
    json.writeStartObject();
    if (copyOfContextMap != null) {
        for (Entry<String, String> entry : copyOfContextMap.entrySet()) {
            json.write(entry.getKey(), entry.getValue());
        }
    }
    json.writeEnd();
    json.flush();
}

Example 12 with JsonGenerator

use of javax.json.stream.JsonGenerator in project digilib by robcast.

the class ServletOps method sendIiifInfo.

/**
 * Returns IIIF compatible image information as application/json response.
 *
 * @param dlReq
 * @param response
 * @param logger
 * @throws FileOpException
 * @throws ServletException
 * @see <a href="http://www-sul.stanford.edu/iiif/image-api/1.1/#info">IIIF Image Information Request</a>
 */
public static void sendIiifInfo(DigilibServletRequest dlReq, HttpServletResponse response, Logger logger) throws ServletException {
    if (response == null) {
        logger.error("No response!");
        return;
    }
    /*
         * get image size
         */
    ImageSize size = null;
    ImageSet imageSet = null;
    try {
        // get original image size
        imageSet = dlReq.getJobDescription().getImageSet();
        ImageInput img = imageSet.getBiggest();
        size = img.getSize();
    } catch (FileOpException e) {
        try {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        } catch (IOException e1) {
            throw new ServletException("Unable to write error response!", e);
        }
    }
    /*
         * get resource URL
         */
    String url = dlReq.getServletRequest().getRequestURL().toString();
    if (url.endsWith("/info.json")) {
        url = url.substring(0, url.lastIndexOf("/info.json"));
    } else if (url.endsWith("/")) {
        url = url.substring(0, url.lastIndexOf("/"));
    }
    /*
         * send response
         */
    response.setCharacterEncoding("UTF-8");
    logger.debug("sending info.json");
    try {
        /*
             * set CORS header ACAO "*" for info response as per IIIF spec
             */
        if (corsForInfoRequests) {
            String origin = dlReq.getServletRequest().getHeader("Origin");
            if (origin != null) {
                response.setHeader("Access-Control-Allow-Origin", "*");
            }
        }
        if (dlConfig.getAsString("iiif-api-version").startsWith("2.")) {
            /*
                 * IIIF Image API version 2 image information
                 */
            // use JSON-LD content type only when asked
            String accept = dlReq.getServletRequest().getHeader("Accept");
            if (accept != null && accept.contains("application/ld+json")) {
                response.setContentType("application/ld+json");
            } else {
                response.setContentType("application/json");
            }
            // write info.json
            ServletOutputStream out = response.getOutputStream();
            JsonGenerator info = Json.createGenerator(out);
            // top level object
            info.writeStartObject().write("@context", "http://iiif.io/api/image/2/context.json").write("@id", url).write("protocol", "http://iiif.io/api/image").write("width", size.width).write("height", size.height);
            // profile[ array
            info.writeStartArray("profile").write("http://iiif.io/api/image/2/level2.json");
            // profile[{ object
            info.writeStartObject();
            // profile[{formats[
            info.writeStartArray("formats").write("jpg").write("png").writeEnd();
            // profile[{qualities[
            info.writeStartArray("qualities").write("color").write("gray").writeEnd();
            // profile[{maxArea
            if (dlConfig.getAsInt("max-image-size") > 0) {
                info.write("maxArea", dlConfig.getAsInt("max-image-size"));
            }
            // profile[{supports[
            info.writeStartArray("supports").write("mirroring").write("rotationArbitrary").write("sizeAboveFull").write("regionSquare").writeEnd();
            // profile[{}
            info.writeEnd();
            // profile[]
            info.writeEnd();
            // add size of original and prescaled images
            int numImgs = imageSet.size();
            if (numImgs > 0) {
                // sizes[
                info.writeStartArray("sizes");
                for (int i = numImgs - 1; i >= 0; --i) {
                    ImageInput ii = imageSet.get(i);
                    ImageSize is = ii.getSize();
                    // sizes[{
                    info.writeStartObject().write("width", is.getWidth()).write("height", is.getHeight()).writeEnd();
                }
                // sizes[]
                info.writeEnd();
            }
            // end info.json
            info.writeEnd();
            info.close();
        } else {
            /*
                 * IIIF Image API version 1 image information
                 */
            response.setContentType("application/json,application/ld+json");
            // write info.json
            ServletOutputStream out = response.getOutputStream();
            JsonGenerator info = Json.createGenerator(out);
            // top level object
            info.writeStartObject().write("@context", "http://library.stanford.edu/iiif/image-api/1.1/context.json").write("@id", url).write("width", size.width).write("height", size.height);
            // formats[
            info.writeStartArray("formats").write("jpg").write("png").writeEnd();
            // qualities[
            info.writeStartArray("qualities").write("native").write("color").write("gray").writeEnd();
            // profile
            info.write("profile", "http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level2");
            // end info.json
            info.writeEnd();
            info.close();
        }
    } catch (IOException e) {
        throw new ServletException("Unable to write response!", e);
    }
}

Example 13 with JsonGenerator

use of javax.json.stream.JsonGenerator in project digilib by robcast.

the class Manifester method processRequest.

protected void processRequest(HttpServletRequest request, HttpServletResponse response) {
    try {
        // create DigilibRequest from ServletRequest, omit IIIF Image API parsing
        DigilibServletRequest dlRequest = new DigilibServletRequest(request, dlConfig, EnumSet.of(ParsingOption.omitIiifImageApi));
        // get list of IIIF parameters
        @SuppressWarnings("unchecked") List<String> iiifParams = (List<String>) dlRequest.getValue("request.iiif.elements");
        if (iiifParams == null) {
            logger.error("Invalid IIIF request.");
            response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Invalid IIIF request.");
            return;
        }
        // get identifier (first parameter)
        // allow empty identifier for image root dir
        String identifier = "";
        if (iiifParams.size() > 0) {
            identifier = iiifParams.get(0);
        }
        // decode identifier to file path
        dlRequest.setValueFromString("fn", dlRequest.decodeIiifIdentifier(identifier));
        // get directory path
        String dlFn = dlRequest.getFilePath();
        // get information about the directory
        DocuDirectory dlDir = dirCache.getDirectory(dlFn);
        if (dlDir == null) {
            logger.error("Directory for manifest not found: " + dlFn);
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }
        // check for existing manifest file
        File mfFile = new File(dlDir.getDir(), "manifest.json");
        // check for image files
        if ((dlDir.size() == 0) && !mfFile.canRead()) {
            logger.debug("Directory has no files: " + dlFn);
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }
        ManifestParams params = new ManifestParams();
        /*
			 * set CORS header ACAO "*" for info response as per IIIF spec
			 */
        if (corsForInfoRequests) {
            String origin = request.getHeader("Origin");
            if (origin != null) {
                response.setHeader("Access-Control-Allow-Origin", "*");
            }
        }
        /*
             * check permissions
             */
        if (useAuthorization) {
            // is the current request/user authorized?
            if (!authzOp.isAuthorized(dlRequest)) {
                // send deny answer and abort
                throw new AuthOpException("Access denied!");
            }
        }
        // use JSON-LD content type only when asked
        String accept = request.getHeader("Accept");
        if (accept != null && accept.contains("application/ld+json")) {
            response.setContentType("application/ld+json");
        } else {
            response.setContentType("application/json");
        }
        if (mfFile.canRead()) {
            // send manifest file
            ServletOps.sendFile(mfFile, "", "", response);
            return;
        }
        // check for manifest-meta.json file with additional metadata
        File mfMetaFile = new File(dlDir.getDir(), "manifest-meta.json");
        if (mfMetaFile.canRead()) {
            params.mfMetaFile = mfMetaFile;
        }
        /*
			 * configure base URLs for manifest
			 */
        params.imgApiUrl = dlConfig.getAsString("iiif-image-base-url");
        String manifestBaseUrl = dlConfig.getAsString("iiif-manifest-base-url");
        if ("".equals(params.imgApiUrl) || "".equals(manifestBaseUrl)) {
            // try to figure out base URLs
            String servletBaseUrl = dlConfig.getAsString("webapp-base-url");
            if ("".equals(servletBaseUrl)) {
                String url = request.getRequestURL().toString();
                // get base URL for web application by last occurrence of Servlet path
                int srvPathLen = url.lastIndexOf(request.getServletPath());
                servletBaseUrl = url.substring(0, srvPathLen);
            }
            // manifest base URL
            manifestBaseUrl = servletBaseUrl + request.getServletPath() + "/" + dlConfig.getAsString("iiif-prefix");
            // Image API base URL
            params.imgApiUrl = servletBaseUrl + "/" + this.scalerServletPath + "/" + dlConfig.getAsString("iiif-prefix");
        }
        // full manifest URL with identifier
        params.manifestUrl = manifestBaseUrl + "/" + identifier;
        params.identifier = identifier;
        params.docuDir = dlDir;
        /*
			 * start json representation
			 */
        ServletOutputStream out = response.getOutputStream();
        JsonGenerator manifest = Json.createGenerator(out).writeStartObject();
        /*
			 * manifest metadata
			 */
        writeManifestMeta(manifest, dlFn, params);
        /*
			 * sequences
			 */
        writeSequences(manifest, params);
        // manifest
        manifest.writeEnd();
        manifest.close();
    } catch (IOException e) {
        logger.error("ERROR sending manifest: ", e);
    } catch (ImageOpException e) {
        logger.error("ERROR sending manifest: ", e);
    } catch (AuthOpException e) {
        logger.debug("Permission denied.");
        try {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
        } catch (IOException e1) {
            logger.error("Error sending error: ", e);
        }
    }
}

Example 14 with JsonGenerator

use of javax.json.stream.JsonGenerator in project javaee7-samples by javaee-samples.

the class MyWriter method writeTo.

@Override
public void writeTo(MyObject t, Class<?> type, Type type1, Annotation[] antns, MediaType mt, MultivaluedMap<String, Object> mm, OutputStream out) throws IOException, WebApplicationException {
    JsonGenerator gen = Json.createGenerator(out);
    gen.writeStartObject().write("name", t.getName()).write("age", t.getAge()).writeEnd();
    gen.flush();
}

Example 15 with JsonGenerator

use of javax.json.stream.JsonGenerator in project javaee7-samples by javaee-samples.

the class StreamingGeneratorTest method testEmptyObject.

@Test
public void testEmptyObject() throws JSONException {
    JsonGeneratorFactory factory = Json.createGeneratorFactory(null);
    StringWriter w = new StringWriter();
    JsonGenerator gen = factory.createGenerator(w);
    gen.writeStartObject().writeEnd();
    gen.flush();
    JSONAssert.assertEquals("{}", w.toString(), JSONCompareMode.STRICT);
}