Example usage for com.fasterxml.jackson.core JsonFactory createGenerator

List of usage examples for com.fasterxml.jackson.core JsonFactory createGenerator

  1. HOME
  2. Java
  3. com.fasterxml
  4. com.fasterxml.jackson.core.*
  5. JsonFactory
  6. createGenerator

Introduction

In this page you can find the example usage for com.fasterxml.jackson.core JsonFactory createGenerator.

Prototype

public JsonGenerator createGenerator(Writer out) throws IOException

Source Link

Document

Method for constructing JSON generator for writing JSON content using specified Writer.

Usage

From source file:org.apache.flink.runtime.jobgraph.jsonplan.JsonPlanGenerator.java

public static String generatePlan(JobGraph jg) {
    try {//from  w w  w .  j a v  a  2  s.  c  om
        final StringWriter writer = new StringWriter(1024);

        final JsonFactory factory = new JsonFactory();
        final JsonGenerator gen = factory.createGenerator(writer);

        // start of everything
        gen.writeStartObject();
        gen.writeStringField("jid", jg.getJobID().toString());
        gen.writeStringField("name", jg.getName());
        gen.writeArrayFieldStart("nodes");

        // info per vertex
        for (JobVertex vertex : jg.getVertices()) {

            String operator = vertex.getOperatorName() != null ? vertex.getOperatorName() : NOT_SET;

            String operatorDescr = vertex.getOperatorDescription() != null ? vertex.getOperatorDescription()
                    : NOT_SET;

            String optimizerProps = vertex.getResultOptimizerProperties() != null
                    ? vertex.getResultOptimizerProperties()
                    : EMPTY;

            String description = vertex.getOperatorPrettyName() != null ? vertex.getOperatorPrettyName()
                    : vertex.getName();

            // make sure the encoding is HTML pretty
            description = StringEscapeUtils.escapeHtml4(description);
            description = description.replace("\n", "<br/>");
            description = description.replace("\\", "&#92;");

            operatorDescr = StringEscapeUtils.escapeHtml4(operatorDescr);
            operatorDescr = operatorDescr.replace("\n", "<br/>");

            gen.writeStartObject();

            // write the core properties
            gen.writeStringField("id", vertex.getID().toString());
            gen.writeNumberField("parallelism", vertex.getParallelism());
            gen.writeStringField("operator", operator);
            gen.writeStringField("operator_strategy", operatorDescr);
            gen.writeStringField("description", description);

            if (!vertex.isInputVertex()) {
                // write the input edge properties
                gen.writeArrayFieldStart("inputs");

                List<JobEdge> inputs = vertex.getInputs();
                for (int inputNum = 0; inputNum < inputs.size(); inputNum++) {
                    JobEdge edge = inputs.get(inputNum);
                    if (edge.getSource() == null) {
                        continue;
                    }

                    JobVertex predecessor = edge.getSource().getProducer();

                    String shipStrategy = edge.getShipStrategyName();
                    String preProcessingOperation = edge.getPreProcessingOperationName();
                    String operatorLevelCaching = edge.getOperatorLevelCachingDescription();

                    gen.writeStartObject();
                    gen.writeNumberField("num", inputNum);
                    gen.writeStringField("id", predecessor.getID().toString());

                    if (shipStrategy != null) {
                        gen.writeStringField("ship_strategy", shipStrategy);
                    }
                    if (preProcessingOperation != null) {
                        gen.writeStringField("local_strategy", preProcessingOperation);
                    }
                    if (operatorLevelCaching != null) {
                        gen.writeStringField("caching", operatorLevelCaching);
                    }

                    gen.writeStringField("exchange", edge.getSource().getResultType().name().toLowerCase());

                    gen.writeEndObject();
                }

                gen.writeEndArray();
            }

            // write the optimizer properties
            gen.writeFieldName("optimizer_properties");
            gen.writeRawValue(optimizerProps);

            gen.writeEndObject();
        }

        // end of everything
        gen.writeEndArray();
        gen.writeEndObject();

        gen.close();

        return writer.toString();
    } catch (Exception e) {
        throw new RuntimeException("Failed to generate plan", e);
    }
}

From source file:io.seldon.spark.actions.JobUtils.java

public static String mapToJson(Map<String, String> m) {
    JsonFactory jsonFactory = new JsonFactory();
    StringWriter sw = new StringWriter();
    try {/*from  ww  w.j a  v  a2  s .c o  m*/
        JsonGenerator jg = jsonFactory.createGenerator(sw);
        jg.writeStartObject();
        for (Map.Entry<String, String> entry : m.entrySet()) {
            jg.writeStringField(entry.getKey(), entry.getValue());
        }
        jg.writeEndObject();
        jg.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return sw.toString();
}

From source file:io.seldon.spark.actions.JobUtils.java

public static String getJsonFromActionData(ActionData actionData) {
    JsonFactory jsonFactory = new JsonFactory();
    StringWriter sw = new StringWriter();
    try {//from   ww  w .j a v a  2 s.c o m
        JsonGenerator jg = jsonFactory.createGenerator(sw);
        jg.writeStartObject();
        jg.writeStringField("timestamp_utc", actionData.timestamp_utc);
        jg.writeStringField("client", actionData.client);
        jg.writeStringField("client_userid", actionData.client_userid);
        jg.writeNumberField("userid", actionData.userid);
        jg.writeNumberField("itemid", actionData.itemid);
        jg.writeStringField("client_itemid", actionData.client_itemid);
        jg.writeStringField("rectag", actionData.rectag);
        jg.writeNumberField("type", actionData.type);
        jg.writeNumberField("value", actionData.value);
        jg.writeEndObject();
        jg.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return sw.toString();
}

From source file:com.palominolabs.crm.sf.rest.HttpApiClientTest.java

private static String reformatJson(@Nullable String input) throws IOException {
    checkNotNull(input);/*from w  w w .  ja va  2s.com*/

    JsonFactory jsonFactory = new JsonFactory();

    JsonParser parser = jsonFactory.createParser(input);
    StringWriter writer = new StringWriter();
    JsonGenerator generator = jsonFactory.createGenerator(writer);
    generator.useDefaultPrettyPrinter();

    while (parser.nextToken() != null) {
        generator.copyCurrentEvent(parser);
    }

    generator.close();

    return writer.toString();
}

From source file:eionet.meta.exports.json.VocabularyJSONOutputHelper.java

/**
 * Writes JSON to output stream./*from   ww w  .java  2 s .c  om*/
 * <p>
 * NOTE: For readability purposes, nested blocks are used in this method while generating json contents.
 * </p>
 *
 * @param out
 *            output stream
 * @param vocabulary
 *            vocabulary base uri
 * @param concepts
 *            list of vocabulary concepts
 * @param language
 *            language for the preferred label
 * @throws java.io.IOException
 *             if error in I/O
 */
public static void writeJSON(OutputStream out, VocabularyFolder vocabulary, List<VocabularyConcept> concepts,
        String language) throws IOException {
    OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8");

    JsonFactory f = new JsonFactory();
    JsonGenerator generator = f.createGenerator(out);
    generator.useDefaultPrettyPrinter();

    language = StringUtils.trimToNull(language);
    boolean checkLanguage = StringUtils.isNotBlank(language);

    List<String> relationalDataElemIdentifiers = new ArrayList<String>();
    relationalDataElemIdentifiers.add(BROADER);
    relationalDataElemIdentifiers.add(NARROWER);

    // start json object
    generator.writeStartObject();
    // add context
    generator.writeObjectFieldStart(JSON_LD_CONTEXT);
    {
        generator.writeStringField(JSON_LD_BASE, VocabularyFolder.getBaseUri(vocabulary));
        generator.writeStringField(VocabularyOutputHelper.LinkedDataNamespaces.SKOS,
                VocabularyOutputHelper.LinkedDataNamespaces.SKOS_NS);
        generator.writeStringField(JSON_LD_CONCEPTS, SKOS_CONCEPT);
        generator.writeStringField(PREF_LABEL, SKOS_PREF_LABEL);
        for (String dataElemShortIdentifier : relationalDataElemIdentifiers) {
            generator.writeStringField(dataElemShortIdentifier, DATA_ELEM_MAP.get(dataElemShortIdentifier));
        }
        generator.writeStringField(JSON_LD_LANGUAGE,
                StringUtils.isNotBlank(language) ? language : DEFAULT_LANGUAGE);
    }
    generator.writeEndObject();
    // start writing concepts...
    generator.writeArrayFieldStart(JSON_LD_CONCEPTS);
    // iterate on concepts
    for (VocabularyConcept concept : concepts) {
        generator.writeStartObject();
        {
            generator.writeStringField(JSON_LD_ID, concept.getIdentifier());
            generator.writeStringField(JSON_LD_TYPE, SKOS_CONCEPT);
            // start writing prefLabels
            generator.writeArrayFieldStart(PREF_LABEL);
            {
                String label;
                String labelLang;
                if (checkLanguage) {
                    List<DataElement> dataElementValuesByNameAndLang = VocabularyOutputHelper
                            .getDataElementValuesByNameAndLang(SKOS_PREF_LABEL, language,
                                    concept.getElementAttributes());
                    if (dataElementValuesByNameAndLang != null && dataElementValuesByNameAndLang.size() > 0) {
                        label = dataElementValuesByNameAndLang.get(0).getAttributeValue();
                        labelLang = language;
                    } else {
                        dataElementValuesByNameAndLang = VocabularyOutputHelper
                                .getDataElementValuesByNameAndLang(SKOS_PREF_LABEL, DEFAULT_LANGUAGE,
                                        concept.getElementAttributes());
                        if (dataElementValuesByNameAndLang != null
                                && dataElementValuesByNameAndLang.size() > 0) {
                            label = dataElementValuesByNameAndLang.get(0).getAttributeValue();
                        } else {
                            label = concept.getLabel();
                        }
                        labelLang = DEFAULT_LANGUAGE;
                    }
                    generator.writeStartObject();
                    {
                        generator.writeStringField(JSON_LD_VALUE, label);
                        generator.writeStringField(JSON_LD_LANGUAGE, labelLang);
                    }
                    generator.writeEndObject();
                } else {
                    generator.writeStartObject();
                    {
                        generator.writeStringField(JSON_LD_VALUE, concept.getLabel());
                        generator.writeStringField(JSON_LD_LANGUAGE, DEFAULT_LANGUAGE);
                    }
                    generator.writeEndObject();
                    List<DataElement> dataElementValuesByName = VocabularyOutputHelper
                            .getDataElementValuesByName(SKOS_PREF_LABEL, concept.getElementAttributes());
                    if (dataElementValuesByName != null && dataElementValuesByName.size() > 0) {
                        for (DataElement elem : dataElementValuesByName) {
                            generator.writeStartObject();
                            {
                                generator.writeStringField(JSON_LD_VALUE, elem.getAttributeValue());
                                generator.writeStringField(JSON_LD_LANGUAGE, elem.getAttributeLanguage());
                            }
                            generator.writeEndObject();
                        }
                    }
                }
            }
            // end writing prefLabels
            generator.writeEndArray();
            // write data elements
            for (String shortDataElemIdentifier : relationalDataElemIdentifiers) {
                // check if it has this element
                List<DataElement> dataElementValuesByName = VocabularyOutputHelper.getDataElementValuesByName(
                        DATA_ELEM_MAP.get(shortDataElemIdentifier), concept.getElementAttributes());
                if (dataElementValuesByName != null && dataElementValuesByName.size() > 0) {
                    // start writing element values
                    generator.writeArrayFieldStart(shortDataElemIdentifier);
                    for (DataElement elem : dataElementValuesByName) {
                        generator.writeStartObject();
                        {
                            generator.writeStringField(JSON_LD_ID, elem.getRelatedConceptIdentifier());
                        }
                        generator.writeEndObject();
                    }
                    // end writing element values
                    generator.writeEndArray();
                }
            }
        }
        // end writing concept
        generator.writeEndObject();
    } // end of iteration on concepts
    generator.writeEndArray();
    // end of vocabulary name
    generator.writeEndObject();

    // close writer and stream
    generator.close();
    osw.close();
}

From source file:org.elasticsearch.client.sniff.HostsSnifferTests.java

private static SniffResponse buildSniffResponse(HostsSniffer.Scheme scheme) throws IOException {
    int numNodes = RandomInts.randomIntBetween(getRandom(), 1, 5);
    List<HttpHost> hosts = new ArrayList<>(numNodes);
    JsonFactory jsonFactory = new JsonFactory();
    StringWriter writer = new StringWriter();
    JsonGenerator generator = jsonFactory.createGenerator(writer);
    generator.writeStartObject();//from  w  w w . j  a  v a2 s.  c o  m
    if (getRandom().nextBoolean()) {
        generator.writeStringField("cluster_name", "elasticsearch");
    }
    if (getRandom().nextBoolean()) {
        generator.writeObjectFieldStart("bogus_object");
        generator.writeEndObject();
    }
    generator.writeObjectFieldStart("nodes");
    for (int i = 0; i < numNodes; i++) {
        String nodeId = RandomStrings.randomAsciiOfLengthBetween(getRandom(), 5, 10);
        generator.writeObjectFieldStart(nodeId);
        if (getRandom().nextBoolean()) {
            generator.writeObjectFieldStart("bogus_object");
            generator.writeEndObject();
        }
        if (getRandom().nextBoolean()) {
            generator.writeArrayFieldStart("bogus_array");
            generator.writeStartObject();
            generator.writeEndObject();
            generator.writeEndArray();
        }
        boolean isHttpEnabled = rarely() == false;
        if (isHttpEnabled) {
            String host = "host" + i;
            int port = RandomInts.randomIntBetween(getRandom(), 9200, 9299);
            HttpHost httpHost = new HttpHost(host, port, scheme.toString());
            hosts.add(httpHost);
            generator.writeObjectFieldStart("http");
            if (getRandom().nextBoolean()) {
                generator.writeArrayFieldStart("bound_address");
                generator.writeString("[fe80::1]:" + port);
                generator.writeString("[::1]:" + port);
                generator.writeString("127.0.0.1:" + port);
                generator.writeEndArray();
            }
            if (getRandom().nextBoolean()) {
                generator.writeObjectFieldStart("bogus_object");
                generator.writeEndObject();
            }
            generator.writeStringField("publish_address", httpHost.toHostString());
            if (getRandom().nextBoolean()) {
                generator.writeNumberField("max_content_length_in_bytes", 104857600);
            }
            generator.writeEndObject();
        }
        if (getRandom().nextBoolean()) {
            String[] roles = { "master", "data", "ingest" };
            int numRoles = RandomInts.randomIntBetween(getRandom(), 0, 3);
            Set<String> nodeRoles = new HashSet<>(numRoles);
            for (int j = 0; j < numRoles; j++) {
                String role;
                do {
                    role = RandomPicks.randomFrom(getRandom(), roles);
                } while (nodeRoles.add(role) == false);
            }
            generator.writeArrayFieldStart("roles");
            for (String nodeRole : nodeRoles) {
                generator.writeString(nodeRole);
            }
            generator.writeEndArray();
        }
        int numAttributes = RandomInts.randomIntBetween(getRandom(), 0, 3);
        Map<String, String> attributes = new HashMap<>(numAttributes);
        for (int j = 0; j < numAttributes; j++) {
            attributes.put("attr" + j, "value" + j);
        }
        if (numAttributes > 0) {
            generator.writeObjectFieldStart("attributes");
        }
        for (Map.Entry<String, String> entry : attributes.entrySet()) {
            generator.writeStringField(entry.getKey(), entry.getValue());
        }
        if (numAttributes > 0) {
            generator.writeEndObject();
        }
        generator.writeEndObject();
    }
    generator.writeEndObject();
    generator.writeEndObject();
    generator.close();
    return SniffResponse.buildResponse(writer.toString(), hosts);
}

From source file:org.elasticsearch.client.sniff.ElasticsearchHostsSnifferTests.java

private static SniffResponse buildSniffResponse(ElasticsearchHostsSniffer.Scheme scheme) throws IOException {
    int numNodes = RandomNumbers.randomIntBetween(getRandom(), 1, 5);
    List<HttpHost> hosts = new ArrayList<>(numNodes);
    JsonFactory jsonFactory = new JsonFactory();
    StringWriter writer = new StringWriter();
    JsonGenerator generator = jsonFactory.createGenerator(writer);
    generator.writeStartObject();//  www  . j a  v a  2s. c o m
    if (getRandom().nextBoolean()) {
        generator.writeStringField("cluster_name", "elasticsearch");
    }
    if (getRandom().nextBoolean()) {
        generator.writeObjectFieldStart("bogus_object");
        generator.writeEndObject();
    }
    generator.writeObjectFieldStart("nodes");
    for (int i = 0; i < numNodes; i++) {
        String nodeId = RandomStrings.randomAsciiOfLengthBetween(getRandom(), 5, 10);
        generator.writeObjectFieldStart(nodeId);
        if (getRandom().nextBoolean()) {
            generator.writeObjectFieldStart("bogus_object");
            generator.writeEndObject();
        }
        if (getRandom().nextBoolean()) {
            generator.writeArrayFieldStart("bogus_array");
            generator.writeStartObject();
            generator.writeEndObject();
            generator.writeEndArray();
        }
        boolean isHttpEnabled = rarely() == false;
        if (isHttpEnabled) {
            String host = "host" + i;
            int port = RandomNumbers.randomIntBetween(getRandom(), 9200, 9299);
            HttpHost httpHost = new HttpHost(host, port, scheme.toString());
            hosts.add(httpHost);
            generator.writeObjectFieldStart("http");
            if (getRandom().nextBoolean()) {
                generator.writeArrayFieldStart("bound_address");
                generator.writeString("[fe80::1]:" + port);
                generator.writeString("[::1]:" + port);
                generator.writeString("127.0.0.1:" + port);
                generator.writeEndArray();
            }
            if (getRandom().nextBoolean()) {
                generator.writeObjectFieldStart("bogus_object");
                generator.writeEndObject();
            }
            generator.writeStringField("publish_address", httpHost.toHostString());
            if (getRandom().nextBoolean()) {
                generator.writeNumberField("max_content_length_in_bytes", 104857600);
            }
            generator.writeEndObject();
        }
        if (getRandom().nextBoolean()) {
            String[] roles = { "master", "data", "ingest" };
            int numRoles = RandomNumbers.randomIntBetween(getRandom(), 0, 3);
            Set<String> nodeRoles = new HashSet<>(numRoles);
            for (int j = 0; j < numRoles; j++) {
                String role;
                do {
                    role = RandomPicks.randomFrom(getRandom(), roles);
                } while (nodeRoles.add(role) == false);
            }
            generator.writeArrayFieldStart("roles");
            for (String nodeRole : nodeRoles) {
                generator.writeString(nodeRole);
            }
            generator.writeEndArray();
        }
        int numAttributes = RandomNumbers.randomIntBetween(getRandom(), 0, 3);
        Map<String, String> attributes = new HashMap<>(numAttributes);
        for (int j = 0; j < numAttributes; j++) {
            attributes.put("attr" + j, "value" + j);
        }
        if (numAttributes > 0) {
            generator.writeObjectFieldStart("attributes");
        }
        for (Map.Entry<String, String> entry : attributes.entrySet()) {
            generator.writeStringField(entry.getKey(), entry.getValue());
        }
        if (numAttributes > 0) {
            generator.writeEndObject();
        }
        generator.writeEndObject();
    }
    generator.writeEndObject();
    generator.writeEndObject();
    generator.close();
    return SniffResponse.buildResponse(writer.toString(), hosts);
}

From source file:org.elasticsearch.client.sniff.ElasticsearchNodesSnifferTests.java

private static SniffResponse buildSniffResponse(ElasticsearchNodesSniffer.Scheme scheme) throws IOException {
    int numNodes = RandomNumbers.randomIntBetween(getRandom(), 1, 5);
    List<Node> nodes = new ArrayList<>(numNodes);
    JsonFactory jsonFactory = new JsonFactory();
    StringWriter writer = new StringWriter();
    JsonGenerator generator = jsonFactory.createGenerator(writer);
    generator.writeStartObject();//from   w  w w .  j  av a2  s .  c om
    if (getRandom().nextBoolean()) {
        generator.writeStringField("cluster_name", "elasticsearch");
    }
    if (getRandom().nextBoolean()) {
        generator.writeObjectFieldStart("bogus_object");
        generator.writeEndObject();
    }
    generator.writeObjectFieldStart("nodes");
    for (int i = 0; i < numNodes; i++) {
        String nodeId = RandomStrings.randomAsciiOfLengthBetween(getRandom(), 5, 10);
        String host = "host" + i;
        int port = RandomNumbers.randomIntBetween(getRandom(), 9200, 9299);
        HttpHost publishHost = new HttpHost(host, port, scheme.toString());
        Set<HttpHost> boundHosts = new HashSet<>();
        boundHosts.add(publishHost);

        if (randomBoolean()) {
            int bound = between(1, 5);
            for (int b = 0; b < bound; b++) {
                boundHosts.add(new HttpHost(host + b, port, scheme.toString()));
            }
        }

        int numAttributes = between(0, 5);
        Map<String, List<String>> attributes = new HashMap<>(numAttributes);
        for (int j = 0; j < numAttributes; j++) {
            int numValues = frequently() ? 1 : between(2, 5);
            List<String> values = new ArrayList<>();
            for (int v = 0; v < numValues; v++) {
                values.add(j + "value" + v);
            }
            attributes.put("attr" + j, values);
        }

        Node node = new Node(publishHost, boundHosts, randomAsciiAlphanumOfLength(5),
                randomAsciiAlphanumOfLength(5),
                new Node.Roles(randomBoolean(), randomBoolean(), randomBoolean()), attributes);

        generator.writeObjectFieldStart(nodeId);
        if (getRandom().nextBoolean()) {
            generator.writeObjectFieldStart("bogus_object");
            generator.writeEndObject();
        }
        if (getRandom().nextBoolean()) {
            generator.writeArrayFieldStart("bogus_array");
            generator.writeStartObject();
            generator.writeEndObject();
            generator.writeEndArray();
        }
        boolean isHttpEnabled = rarely() == false;
        if (isHttpEnabled) {
            nodes.add(node);
            generator.writeObjectFieldStart("http");
            generator.writeArrayFieldStart("bound_address");
            for (HttpHost bound : boundHosts) {
                generator.writeString(bound.toHostString());
            }
            generator.writeEndArray();
            if (getRandom().nextBoolean()) {
                generator.writeObjectFieldStart("bogus_object");
                generator.writeEndObject();
            }
            generator.writeStringField("publish_address", publishHost.toHostString());
            if (getRandom().nextBoolean()) {
                generator.writeNumberField("max_content_length_in_bytes", 104857600);
            }
            generator.writeEndObject();
        }

        List<String> roles = Arrays.asList(new String[] { "master", "data", "ingest" });
        Collections.shuffle(roles, getRandom());
        generator.writeArrayFieldStart("roles");
        for (String role : roles) {
            if ("master".equals(role) && node.getRoles().isMasterEligible()) {
                generator.writeString("master");
            }
            if ("data".equals(role) && node.getRoles().isData()) {
                generator.writeString("data");
            }
            if ("ingest".equals(role) && node.getRoles().isIngest()) {
                generator.writeString("ingest");
            }
        }
        generator.writeEndArray();

        generator.writeFieldName("version");
        generator.writeString(node.getVersion());
        generator.writeFieldName("name");
        generator.writeString(node.getName());

        if (numAttributes > 0) {
            generator.writeObjectFieldStart("attributes");
            for (Map.Entry<String, List<String>> entry : attributes.entrySet()) {
                if (entry.getValue().size() == 1) {
                    generator.writeStringField(entry.getKey(), entry.getValue().get(0));
                } else {
                    for (int v = 0; v < entry.getValue().size(); v++) {
                        generator.writeStringField(entry.getKey() + "." + v, entry.getValue().get(v));
                    }
                }
            }
            generator.writeEndObject();
        }
        generator.writeEndObject();
    }
    generator.writeEndObject();
    generator.writeEndObject();
    generator.close();
    return SniffResponse.buildResponse(writer.toString(), nodes);
}

From source file:org.jberet.support.io.JsonItemWriter.java

protected static JsonGenerator configureJsonGenerator(final JsonFactory jsonFactory,
        final OutputStream outputStream, final Class<?> outputDecorator,
        final Map<String, String> jsonGeneratorFeatures) throws Exception {
    if (outputDecorator != null) {
        jsonFactory.setOutputDecorator((OutputDecorator) outputDecorator.newInstance());
    }/* w  w  w. j a  v  a 2  s.  c  om*/
    final JsonGenerator jsonGenerator = jsonFactory.createGenerator(outputStream);

    if (jsonGeneratorFeatures != null) {
        for (final Map.Entry<String, String> e : jsonGeneratorFeatures.entrySet()) {
            final String key = e.getKey();
            final String value = e.getValue();
            final JsonGenerator.Feature feature;
            try {
                feature = JsonGenerator.Feature.valueOf(key);
            } catch (final Exception e1) {
                throw SupportMessages.MESSAGES.unrecognizedReaderWriterProperty(key, value);
            }
            if ("true".equals(value)) {
                if (!feature.enabledByDefault()) {
                    jsonGenerator.configure(feature, true);
                }
            } else if ("false".equals(value)) {
                if (feature.enabledByDefault()) {
                    jsonGenerator.configure(feature, false);
                }
            } else {
                throw SupportMessages.MESSAGES.invalidReaderWriterProperty(null, value, key);
            }
        }
    }

    return jsonGenerator;
}

From source file:com.tage.calcite.adapter.druid.DruidQuery.java

/** Generates a JSON string to query metadata about a data source. */
static String metadataQuery(String dataSourceName, List<String> intervals) {
    final StringWriter sw = new StringWriter();
    final JsonFactory factory = new JsonFactory();
    try {/*www .ja va  2s .  co  m*/
        final JsonGenerator generator = factory.createGenerator(sw);
        generator.writeStartObject();
        generator.writeStringField("queryType", "segmentMetadata");
        generator.writeStringField("dataSource", dataSourceName);
        generator.writeBooleanField("merge", true);
        generator.writeArrayFieldStart("analysisTypes");
        generator.writeString("aggregators");
        generator.writeEndArray();
        writeFieldIf(generator, "intervals", intervals);
        generator.writeEndObject();
        generator.close();
    } catch (IOException e) {
        throw Throwables.propagate(e);
    }
    return sw.toString();
}