Examples of com.fasterxml.jackson.core.JsonGenerator

com.fasterxml.jackson.core.JsonGenerator
Base class that defines public API for writing JSON content. Instances are created using factory methods of a {@link JsonFactory} instance. @author Tatu Saloranta

  private byte[] toStorageJson() {
    // grab some memory to avoid reallocs
    final ByteArrayOutputStream output = new ByteArrayOutputStream(
        (display_name.length() * 2) + (path.size() * 128));
    try {
      final JsonGenerator json = JSON.getFactory().createGenerator(output);
      
      json.writeStartObject();
      
      // we only need to write a small amount of information
      json.writeObjectField("path", path);
      json.writeStringField("displayName", display_name);
      
      json.writeEndObject();
      json.close();
      
      // TODO zero copy?
      return output.toByteArray();
    } catch (IOException e) {
      throw new RuntimeException(e);

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   */
  private byte[] getStorageJSON() {
    // TODO - precalculate size
    final ByteArrayOutputStream output = new ByteArrayOutputStream();
    try {
      final JsonGenerator json = JSON.getFactory().createGenerator(output); 
      json.writeStartObject();
      if (tsuid != null && !tsuid.isEmpty()) {
        json.writeStringField("tsuid", tsuid);  
      }
      json.writeNumberField("startTime", start_time);
      json.writeNumberField("endTime", end_time);
      json.writeStringField("description", description);
      json.writeStringField("notes", notes);
      if (custom == null) {
        json.writeNullField("custom");
      } else {
        json.writeObjectFieldStart("custom");
        for (Map.Entry<String, String> entry : custom.entrySet()) {
          json.writeStringField(entry.getKey(), entry.getValue());
        }
        json.writeEndObject();
      }
      
      json.writeEndObject(); 
      json.close();
      return output.toByteArray();
    } catch (IOException e) {
      throw new RuntimeException("Unable to serialize Annotation", e);
    }
  }

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   */
  private byte[] getStorageJSON() {
    // 256 bytes is a good starting value, assumes default info
    final ByteArrayOutputStream output = new ByteArrayOutputStream(256);
    try {
      final JsonGenerator json = JSON.getFactory().createGenerator(output); 
      json.writeStartObject();
      json.writeStringField("uid", uid);
      json.writeStringField("type", type.toString());
      json.writeStringField("name", name);
      json.writeStringField("displayName", display_name);
      json.writeStringField("description", description);
      json.writeStringField("notes", notes);
      json.writeNumberField("created", created);
      if (custom == null) {
        json.writeNullField("custom");
      } else {
        json.writeObjectFieldStart("custom");
        for (Map.Entry<String, String> entry : custom.entrySet()) {
          json.writeStringField(entry.getKey(), entry.getValue());
        }
        json.writeEndObject();
      }
      
      json.writeEndObject(); 
      json.close();
      return output.toByteArray();
    } catch (IOException e) {
      throw new RuntimeException("Unable to serialize UIDMeta", e);
    }
  }

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   */
  private byte[] toStorageJson() {
    final ByteArrayOutputStream output = new ByteArrayOutputStream(
        display_name.length() + tsuid.length() + 30);
    try {
      final JsonGenerator json = JSON.getFactory().createGenerator(output);
      
      json.writeStartObject();
      
      // we only need to write a small amount of information
      json.writeObjectField("displayName", display_name);
      json.writeObjectField("tsuid", tsuid);
      
      json.writeEndObject();
      json.close();
      
      // TODO zero copy?
      return output.toByteArray();
    } catch (IOException e) {
      throw new RuntimeException(e);

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            factory.enable(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS);
            factory.enable(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES);
        }


        // Open the output stream and create the Json emitter.
        JsonGenerator generator;
        File tempOutputFile = null, outputFile = null;
        if ("-".equals(outputFilename)) {
            generator = factory.createGenerator(stdout, JsonEncoding.UTF8);
        } else if (!caseInsensitiveContains(inputFilenames, outputFilename)) {
            generator = factory.createGenerator(new File(outputFilename), JsonEncoding.UTF8);
        } else {
            // Writing to an input file.. use a temp file to stage the output until we're done.
            outputFile = new File(outputFilename);
            tempOutputFile = getTemporaryFileFor(outputFile);
            generator = factory.createGenerator(tempOutputFile, JsonEncoding.UTF8);
        }
        try {
            // Separate top-level objects by a newline in the output.
            String newline = System.getProperty("line.separator");
            generator.setPrettyPrinter(new DefaultPrettyPrinter(newline));


            for (String inputFilename : inputFilenames) {
                JsonParser parser;
                if ("-".equals(inputFilename)) {
                    parser = factory.createParser(stdin);
                } else {
                    parser = factory.createParser(new File(inputFilename));
                }
                try {
                    while (parser.nextToken() != null) {
                        generator.copyCurrentStructure(parser);
                    }
                } finally {
                    parser.close();
                }
            }


            generator.writeRaw(newline);
        } finally {
            generator.close();
        }
        if (tempOutputFile != null && !tempOutputFile.renameTo(outputFile)) {
            System.err.println("error: unable to rename temporary file to output: " + outputFile);
            System.exit(1);
        }

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      ServletOutputStream outputStream = response.getOutputStream();


      if (!streamResponse) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
        JsonGenerator jsonGenerator = objectMapper.getFactory().createJsonGenerator(bos, JsonEncoding.UTF8);


        if (jsonView == null) {
          objectMapper.writeValue(jsonGenerator, responseObject);
        } else {
          objectMapper.writerWithView(jsonView).writeValue(jsonGenerator, responseObject);
        }


        response.setContentLength(bos.size());
        outputStream.write(bos.toByteArray());
        jsonGenerator.close();
      } else {
        JsonGenerator jsonGenerator = objectMapper.getFactory().createJsonGenerator(outputStream,
            JsonEncoding.UTF8);
        if (jsonView == null) {
          objectMapper.writeValue(jsonGenerator, responseObject);
        } else {
          objectMapper.writerWithView(jsonView).writeValue(jsonGenerator, responseObject);
        }
        jsonGenerator.close();
      }


      outputStream.flush();
    }
  }

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     * @throws IOException
     * TODO: move this to a custom serializer?
     */
    private static String toJSON(BucketProperties bp) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        JsonGenerator jg = new JsonFactory().createJsonGenerator(out, JsonEncoding.UTF8);


        jg.writeStartObject();
        writeIfNotNull(jg, bp.getAllowSiblings(), Constants.FL_SCHEMA_ALLOW_MULT);
        writeIfNotNull(jg, bp.getNVal(), Constants.FL_SCHEMA_NVAL);
        writeIfNotNull(jg, bp.getLastWriteWins(), Constants.FL_SCHEMA_LAST_WRITE_WINS);
        writeIfNotNull(jg, bp.getBackend(), Constants.FL_SCHEMA_BACKEND);
        writeIfNotNull(jg, bp.getSmallVClock(), Constants.FL_SCHEMA_SMALL_VCLOCK);
        writeIfNotNull(jg, bp.getBigVClock(), Constants.FL_SCHEMA_BIG_VCLOCK);
        writeIfNotNull(jg, bp.getYoungVClock(), Constants.FL_SCHEMA_YOUNG_VCLOCK);
        writeIfNotNull(jg, bp.getOldVClock(), Constants.FL_SCHEMA_OLD_VCLOCK);
        writeIfNotNull(jg, bp.getR(), Constants.FL_SCHEMA_R);
        writeIfNotNull(jg, bp.getRW(), Constants.FL_SCHEMA_RW);
        writeIfNotNull(jg, bp.getW(), Constants.FL_SCHEMA_W);
        writeIfNotNull(jg, bp.getDW(), Constants.FL_SCHEMA_DW);
        writeIfNotNull(jg, bp.getPR(), Constants.FL_SCHEMA_PR);
        writeIfNotNull(jg, bp.getPW(), Constants.FL_SCHEMA_PW);
        writeIfNotNull(jg, bp.getBasicQuorum(), Constants.FL_SCHEMA_BASIC_QUORUM);
        writeIfNotNull(jg, bp.getNotFoundOK(), Constants.FL_SCHEMA_NOT_FOUND_OK);
        writeIfNotNull(jg, bp.getChashKeyFunction(), Constants.FL_SCHEMA_CHASHFUN);
        writeIfNotNull(jg, bp.getLinkWalkFunction(), Constants.FL_SCHEMA_LINKFUN);
        writeIfNotNull(jg, bp.getPostcommitHooks(), Constants.FL_SCHEMA_POSTCOMMIT);
        writeIfNotNull(jg, bp.getPrecommitHooks(), Constants.FL_SCHEMA_PRECOMMIT);
        writeIfNotNull(jg, bp.getSearch(), Constants.FL_SCHEMA_SEARCH);


        jg.writeEndObject();


        jg.flush();
        return CharsetUtils.asUTF8String(out.toByteArray());
    }

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    private String writeSpec() throws RiakException {


        final ByteArrayOutputStream out = new ByteArrayOutputStream();


        try {
            JsonGenerator jg = new JsonFactory().createJsonGenerator(out, JsonEncoding.UTF8);
            jg.setCodec(new ObjectMapper());


            jg.writeStartObject();


            jg.writeFieldName("inputs");
            writeInput(jg);


            jg.writeFieldName("query");
            jg.writeStartArray();


            writePhases(jg);


            jg.writeEndArray();
            if (timeout != null) {
                jg.writeNumberField("timeout", timeout);
            }


            jg.writeEndObject();
            jg.flush();


            return out.toString("UTF8");
        } catch (IOException e) {
            throw new RiakException(e);
        }

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        File outputFile = new File(outputDirectory, finalName + "-changes.json");


        JsonFactory factory = new JsonFactory();
        try {
            JsonGenerator generator = factory.createJsonGenerator(outputFile, JsonEncoding.UTF8);
            generator.setPrettyPrinter(new DefaultPrettyPrinter());
            try {
                generator.writeStartObject();
                generator.writeStringField("previousVersion", previousVersion);
                generator.writeFieldName("dependencies");
                writeDependenciesDelta(addedDeps, removedDeps, updatedDeps, unchangedDeps, generator);
                if (changeLog != null) {
                    generator.writeFieldName("scm");
                    writeChangeLog(generator, changeLog);
                }
                generator.writeEndObject();
            } finally {
                generator.close();
            }
        } catch (IOException e) {
            throw new MojoExecutionException(e.getMessage(), e);
        }
        projectHelper.attachArtifact(project, "json", "changes", outputFile);

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    }


    @Override
    public void render(Tree tree, HttpServletResponse response)
            throws IOException {
        JsonGenerator generator = startResponse(response);
        render(tree, generator);
        generator.close();
    }

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