Example usage for com.fasterxml.jackson.core JsonGenerator writeStartObject

List of usage examples for com.fasterxml.jackson.core JsonGenerator writeStartObject

  1. HOME
  2. Java
  3. com.fasterxml
  4. com.fasterxml.jackson.core.*
  5. JsonGenerator
  6. writeStartObject

Introduction

In this page you can find the example usage for com.fasterxml.jackson.core JsonGenerator writeStartObject.

Prototype

public abstract void writeStartObject() throws IOException, JsonGenerationException;

Source Link

Document

Method for writing starting marker of a JSON Object value (character '{'; plus possible white space decoration if pretty-printing is enabled).

Usage

From source file:com.proofpoint.event.collector.FilteringMapSerializer.java

@Override
public void serialize(Map<String, ?> map, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonProcessingException {
    //have to do this before starting to write the object, otherwise proper context is lost.
    PropertyMapSelectionPolicy filter = findApplicableFilter(jgen.getOutputContext());
    jgen.writeStartObject();
    for (Map.Entry<String, ?> entry : map.entrySet()) {
        String name = entry.getKey();

        if (!filter.matches(name)) {
            continue;
        }/* ww  w.ja v a 2  s . c o m*/

        Object value = entry.getValue();
        jgen.writeObjectField(name, value);
    }
    jgen.writeEndObject();
}

From source file:net.logstash.logback.composite.CompositeJsonFormatter.java

protected void writeEventToGenerator(JsonGenerator generator, Event event) throws IOException {
    if (!isStarted()) {
        throw new IllegalStateException("Encoding attempted before starting.");
    }/*www  .  j a v  a 2  s. co  m*/
    generator.writeStartObject();
    jsonProviders.writeTo(generator, event);
    generator.writeEndObject();
    generator.flush();
}

From source file:com.arpnetworking.logback.serialization.ObjectAsJsonSerialziationStrategy.java

/**
 * Serialize an event./*from www . j  a va2  s  .c  o m*/
 *
 * @param event The event.
 * @param eventName The event name.
 * @param jsonData The message data as serialized JSON.
 * @return Serialization of message as a <code>String</code>.
 */
public String serialize(final ILoggingEvent event, final String eventName, final String jsonData) {

    final StringWriter jsonWriter = new StringWriter();
    try {
        final JsonGenerator jsonGenerator = _jsonFactory.createGenerator(jsonWriter);
        // Start wrapper
        startStenoWrapper(event, eventName, jsonGenerator, _objectMapper);

        // Write event data
        jsonGenerator.writeFieldName("data");
        if (jsonData == null) {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeEndObject();
        } else {
            jsonGenerator.writeRawValue(jsonData);
        }
        // TODO(vkoskela): Support writing null objects as-is via configuration [MAI-333]
        // e.g. "data":null -- although this is not supported by the current Steno specification

        // Output throwable
        writeThrowable(event.getThrowableProxy(), jsonGenerator, _objectMapper);

        // End wrapper
        endStenoWrapper(event, eventName, jsonGenerator, _objectMapper);
    } catch (final IOException e) {
        return "Unknown exception: " + e.getMessage();
    }

    return jsonWriter.toString();
}

From source file:test.com.azaptree.services.json.JsonUtilsTest.java

@Test
public void test_serialize() throws JsonGenerationException, IOException {
    final ByteArrayOutputStream bos = new ByteArrayOutputStream();
    final JsonGenerator generator = JsonUtils.createJsonGenerator(bos);
    generator.writeStartObject();
    generator.writeStringField("stringField", "stringFieldValue");
    generator.writeNumberField("numberField", 5);
    generator.writeEndObject();/*from w  w  w  . j  ava 2  s. com*/
    generator.close();

    final Map<String, Object> test = JsonUtils.parse(new ByteArrayInputStream(bos.toByteArray()));
    Assert.assertEquals(test.get("stringField"), "stringFieldValue");
    Assert.assertEquals(test.get("numberField"), 5);
}

From source file:com.ning.metrics.action.hdfs.reader.HdfsListing.java

@SuppressWarnings({ "unchecked", "unused" })
public void toJson(final OutputStream out, final boolean pretty) throws IOException {
    final String parentPath = getParentPath() == null ? "" : getParentPath();

    final JsonGenerator generator = new JsonFactory().createJsonGenerator(out);
    generator.configure(JsonGenerator.Feature.AUTO_CLOSE_TARGET, false);
    if (pretty) {
        generator.setPrettyPrinter(new DefaultPrettyPrinter());
    }/*from  www  .  j ava2  s.c om*/

    generator.writeStartObject();
    generator.writeObjectField(JSON_LISTING_PATH, getPath());
    generator.writeObjectField(JSON_LISTING_PARENT_PATH, parentPath);
    generator.writeArrayFieldStart(JSON_LISTING_ENTRIES);
    // Important: need to flush before appending pre-serialized events
    generator.flush();

    for (HdfsEntry entry : getEntries()) {
        entry.toJson(generator);
    }
    generator.writeEndArray();

    generator.writeEndObject();
    generator.close();
}

From source file:com.predic8.membrane.core.interceptor.administration.AdminRESTInterceptor.java

@Mapping("/admin/rest/exchanges/(-?\\d+)/(response|request)/header")
public Response getRequestHeader(QueryParameter params, String relativeRootPath) throws Exception {
    final AbstractExchange exc = router.getExchangeStore().getExchangeById(params.getGroupInt(1));

    if (exc == null) {
        return Response.notFound().build();
    }/*from w  w  w .  j  a  v a  2 s.  c  om*/

    final Message msg = params.getGroup(2).equals("response") ? exc.getResponse() : exc.getRequest();

    if (msg == null) {
        return Response.noContent().build();
    }

    return json(new JSONContent() {
        public void write(JsonGenerator gen) throws Exception {
            gen.writeStartObject();
            gen.writeArrayFieldStart("headers");
            for (HeaderField hf : msg.getHeader().getAllHeaderFields()) {
                gen.writeStartObject();
                gen.writeStringField("name", hf.getHeaderName().toString());
                gen.writeStringField("value", hf.getValue());
                gen.writeEndObject();
            }
            gen.writeEndArray();
            gen.writeEndObject();
        }
    });
}

From source file:org.neo4j.ontology.server.unmanaged.AnnotationResource.java

private void writeJsonNodeObject(JsonGenerator jg, Node term, Label annotationLabel) throws IOException {
    jg.writeStartObject(); // {
    jg.writeStringField("uri", term.getProperty("uri").toString()); // uri: "http://www.w3.org/2002/07/owl#Thing"
    jg.writeStringField("ontId", term.getProperty("name").toString()); // ontId: "OWL:Thing"
    jg.writeStringField("label", term.getProperty("rdfs:label", term.getProperty("name")).toString()); // ontId: "OWL:Thing"
    jg.writeFieldName("dataSets"); // dataSets:
    jg.writeStartArray(); // [
    jg.writeEndArray(); // ]
    writeJsonNodeObjectParents(jg, term, annotationLabel);
    jg.writeEndObject(); // }
}

From source file:com.msopentech.odatajclient.engine.performance.BasicPerfTest.java

@Test
public void writeJSONViaLowerlevelLibs() throws IOException {
    final StringWriter writer = new StringWriter();

    final ObjectMapper mapper = new ObjectMapper();

    final JsonGenerator jgen = mapper.getFactory().createGenerator(writer);

    jgen.writeStartObject();//w ww  . ja  v a2  s .co  m

    jgen.writeStringField("odata.type", "Microsoft.Test.OData.Services.AstoriaDefaultService.Customer");

    jgen.writeStringField("Name@odata.type", "Edm.String");
    jgen.writeStringField("Name", "A name");

    jgen.writeStringField("CustomerId@odata.type", "Edm.Int32");
    jgen.writeNumberField("CustomerId", 0);

    jgen.writeArrayFieldStart("BackupContactInfo");

    jgen.writeStartObject();

    jgen.writeArrayFieldStart("AlternativeNames");
    jgen.writeString("myname");
    jgen.writeEndArray();

    jgen.writeArrayFieldStart("EmailBag");
    jgen.writeString("myname@mydomain.com");
    jgen.writeEndArray();

    jgen.writeObjectFieldStart("ContactAlias");
    jgen.writeStringField("odata.type", "Microsoft.Test.OData.Services.AstoriaDefaultService.Aliases");
    jgen.writeArrayFieldStart("AlternativeNames");
    jgen.writeString("myAlternativeName");
    jgen.writeEndArray();
    jgen.writeEndObject();

    jgen.writeEndObject();

    jgen.writeEndArray();

    jgen.writeEndObject();

    jgen.flush();

    assertFalse(writer.toString().isEmpty());
}

From source file:org.bndtools.rt.repository.server.RepositoryResourceComponent.java

@GET
@Path("bundles/{bsn}")
@Produces(MediaType.APPLICATION_JSON)//from ww w .  j av a  2  s . co m
public Response listVersions(@Context UriInfo uriInfo, @PathParam("bsn") String bsn) throws Exception {
    SortedSet<Version> versions = repo.versions(bsn);

    UriBuilder uriBuilder = uriInfo.getAbsolutePathBuilder().path("{version}");

    StringWriter writer = new StringWriter();
    JsonGenerator generator = jsonFactory.createJsonGenerator(writer);
    generator.writeStartArray();
    for (Version version : versions) {
        generator.writeStartObject();
        generator.writeStringField("bsn", bsn);
        generator.writeStringField("version", version.toString());
        generator.writeStringField("href", uriBuilder.build(version).toString());
        generator.writeEndObject();
    }
    generator.writeEndArray();
    generator.close();

    return Response.ok(writer.toString(), MediaType.APPLICATION_JSON).build();
}

From source file:com.messagehub.samples.servlet.MessageList.java

/**
 * Build message list dependent on the format Message Hub requires. The
 * message list is in the form: [{ "value": base_64_string }, ...]
 *
 * @return {String} String representation of a JSON object.
 * @throws IOException//from   w  w w . j a  v a2 s .c o m
 */
public String build() throws IOException {
    final JsonFactory jsonFactory = new JsonFactory();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    JsonGenerator jsonGenerator = null;

    jsonGenerator = jsonFactory.createGenerator(outputStream);

    jsonGenerator.writeStartArray();

    // Write each message as a JSON object in
    // the form:
    // { "value": base_64_string }
    for (int i = 0; i < this.messages.size(); i++) {
        jsonGenerator.writeStartObject();
        jsonGenerator.writeFieldName("value");
        jsonGenerator.writeObject(this.messages.get(i));
        jsonGenerator.writeEndObject();
    }

    jsonGenerator.writeEndArray();

    // Close underlying streams and return string representation.
    jsonGenerator.close();
    outputStream.close();

    return new String(outputStream.toByteArray());
}