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

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

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Introduction

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

Prototype

public final void writeNullField(String fieldName) throws IOException, JsonGenerationException

Source Link

Document

Convenience method for outputting a field entry ("member") that has JSON literal value null.

Usage

From source file:io.mesosphere.mesos.frameworks.cassandra.scheduler.api.NodeController.java

private Response nodeStatusUpdate(final CassandraFrameworkProtos.CassandraNode cassandraNode) {
    if (cassandraNode == null) {
        return Response.status(Response.Status.NOT_FOUND).build();
    }// w ww .  j  av  a 2 s. c o  m

    return JaxRsUtils.buildStreamingResponse(factory, new StreamingJsonResponse() {
        @Override
        public void write(final JsonGenerator json) throws IOException {
            json.writeStringField("ip", cassandraNode.getIp());
            json.writeStringField("hostname", cassandraNode.getHostname());
            if (!cassandraNode.hasCassandraNodeExecutor()) {
                json.writeNullField("executorId");
            } else {
                json.writeStringField("executorId", cassandraNode.getCassandraNodeExecutor().getExecutorId());
            }
            json.writeStringField("targetRunState", cassandraNode.getTargetRunState().name());
        }
    });
}

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

private void writeExchange(AbstractExchange exc, JsonGenerator gen)
        throws IOException, JsonGenerationException, SQLException {
    gen.writeStartObject();//from   w  w w .java  2  s .  co m
    gen.writeNumberField("id", exc.getId());
    if (exc.getResponse() != null) {
        gen.writeNumberField("statusCode", exc.getResponse().getStatusCode());
        if (exc.getResponseContentLength() != -1) {
            gen.writeNumberField("respContentLength", exc.getResponseContentLength());
        } else {
            gen.writeNullField("respContentLength");
        }
    } else {
        gen.writeNullField("statusCode");
        gen.writeNullField("respContentLength");
    }
    gen.writeStringField("time", ExchangesUtil.getTime(exc));
    gen.writeStringField("proxy", exc.getRule().toString());
    gen.writeNumberField("listenPort", exc.getRule().getKey().getPort());
    gen.writeStringField("method", exc.getRequest().getMethod());
    gen.writeStringField("path", exc.getRequest().getUri());
    gen.writeStringField("client", exc.getRemoteAddr());
    gen.writeStringField("server", exc.getServer());
    gen.writeNumberField("serverPort", getServerPort(exc));
    gen.writeStringField("reqContentType", exc.getRequestContentType());
    if (exc.getRequestContentLength() != -1) {
        gen.writeNumberField("reqContentLength", exc.getRequestContentLength());
    } else {
        gen.writeNullField("reqContentLength");
    }

    gen.writeStringField("respContentType", exc.getResponseContentType());
    gen.writeStringField("respContentLength", exc.getResponseContentType());

    gen.writeNumberField("duration", exc.getTimeResReceived() - exc.getTimeReqSent());
    gen.writeStringField("msgFilePath", JDBCUtil.getFilePath(exc));
    gen.writeEndObject();
}

From source file:io.mesosphere.mesos.frameworks.cassandra.scheduler.api.NodeController.java

private Response nodeUpdateSeed(final String node, final boolean seed) {
    final CassandraFrameworkProtos.CassandraNode cassandraNode = cluster.findNode(node);
    if (cassandraNode == null) {
        return Response.status(404).build();
    }//from ww w. j a v  a2  s  .  c  om

    try {
        final boolean seedChanged = cluster.setNodeSeed(cassandraNode, seed);

        return JaxRsUtils.buildStreamingResponse(factory, new StreamingJsonResponse() {
            @Override
            public void write(final JsonGenerator json) throws IOException {
                json.writeStringField("ip", cassandraNode.getIp());
                json.writeStringField("hostname", cassandraNode.getHostname());
                if (!cassandraNode.hasCassandraNodeExecutor()) {
                    json.writeNullField("executorId");
                } else {
                    json.writeStringField("executorId",
                            cassandraNode.getCassandraNodeExecutor().getExecutorId());
                }
                json.writeBooleanField("oldSeedState", cassandraNode.getSeed());

                if (seedChanged) {
                    json.writeBooleanField("success", true);
                    json.writeBooleanField("seedState", seed);
                } else {
                    json.writeBooleanField("success", false);
                    json.writeBooleanField("seedState", cassandraNode.getSeed());
                }

            }
        });
    } catch (final SeedChangeException e) {
        return JaxRsUtils.buildStreamingResponse(factory, Response.Status.BAD_REQUEST,
                new StreamingJsonResponse() {
                    @Override
                    public void write(final JsonGenerator json) throws IOException {
                        json.writeStringField("ip", cassandraNode.getIp());
                        json.writeStringField("hostname", cassandraNode.getHostname());
                        if (!cassandraNode.hasCassandraNodeExecutor()) {
                            json.writeNullField("executorId");
                        } else {
                            json.writeStringField("executorId",
                                    cassandraNode.getCassandraNodeExecutor().getExecutorId());
                        }
                        json.writeBooleanField("oldSeedState", cassandraNode.getSeed());

                        json.writeBooleanField("success", false);
                        json.writeStringField("error", e.getMessage());
                    }
                });
    }

}

From source file:org.n52.ar.layar.LayarResponse.java

public void toJSON(final JsonGenerator generator) throws IOException {
    generator.writeStartObject();/*from  w ww .j av a2s  . c  om*/

    /*
     * mandatory:
     */
    generator.writeStringField("layer", this.layer);
    if (this.errorCode != CODE_ERROR && this.hotspots.size() < 1) {
        this.errorString = "No POI found. Please increase the search range to try again.";
        this.errorCode = CODE_ERROR;
    }
    generator.writeStringField("errorString", this.errorString);
    generator.writeNumberField("errorCode", this.errorCode);

    // paging is not implemented yet
    generator.writeBooleanField("morePages", this.morePages);
    if (this.nextPageKey != null) {
        generator.writeStringField("nextPageKey", this.nextPageKey);
    } else {
        generator.writeNullField("nextPageKey");
    }
    // generator.writeNumberField("refreshInterval", 3600);
    // generator.writeNumberField("refreshDistance", 50);
    // generator.writeBooleanField("fullRefresh", false);
    // actions for the entire layer: http://layar.com/documentation/browser/api/getpois-response/actions/
    if (this.errorCode == CODE_OK)
        this.showMessage = "You got " + this.hotspots.size() + " hits in the area around you!";
    generator.writeStringField("showMessage", this.showMessage);
    // deletedHotspots
    // animations
    // showDialog: title, description, iconURL, actions
    generator.writeNullField("biwStyle");

    /*
     * hotspots (mandatory):
     */
    createHotspots(generator);

    generator.writeEndObject();
}

From source file:net.opentsdb.meta.UIDMeta.java

/**
 * Formats the JSON output for writing to storage. It drops objects we don't
 * need or want to store (such as the UIDMeta objects or the total dps) to
 * save space. It also serializes in order so that we can make a proper CAS
 * call. Otherwise the POJO serializer may place the fields in any order
 * and CAS calls would fail all the time.
 * @return A byte array to write to storage
 *//*from   w w w  .  jav a2 s .co m*/
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("type", type.toString());
        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);
    }
}

From source file:net.opentsdb.meta.Annotation.java

/**
 * Serializes the object in a uniform matter for storage. Needed for 
 * successful CAS calls//from  w  w w .jav a  2s.  c  o  m
 * @return The serialized object as a byte array
 */
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);
    }
}

From source file:net.opentsdb.meta.TSMeta.java

/**
 * Formats the JSON output for writing to storage. It drops objects we don't
 * need or want to store (such as the UIDMeta objects or the total dps) to
 * save space. It also serializes in order so that we can make a proper CAS
 * call. Otherwise the POJO serializer may place the fields in any order
 * and CAS calls would fail all the time.
 * @return A byte array to write to storage
 *//*from   www. jav a2  s  .  co  m*/
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("tsuid", tsuid);
        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.writeStringField("units", units);
        json.writeStringField("dataType", data_type);
        json.writeNumberField("retention", retention);
        json.writeNumberField("max", max);
        json.writeNumberField("min", min);

        json.writeEndObject();
        json.close();
        return output.toByteArray();
    } catch (IOException e) {
        throw new RuntimeException("Unable to serialize TSMeta", e);
    }
}

From source file:com.msopentech.odatajclient.engine.data.json.DOMTreeUtilsV3.java

/**
 * Serializes DOM content as JSON./*from w ww.jav  a 2  s.  com*/
 *
 * @param client OData client.
 * @param jgen JSON generator.
 * @param content content.
 * @param propType whether to output type information in the way needed for property values or not.
 * @throws IOException in case of write error.
 */
public static void writeSubtree(final ODataClient client, final JsonGenerator jgen, final Node content,
        final boolean propType) throws IOException {

    for (Node child : XMLUtils.getChildNodes(content, Node.ELEMENT_NODE)) {
        final String childName = XMLUtils.getSimpleName(child);

        final Node typeAttr = child.getAttributes().getNamedItem(ODataConstants.ATTR_M_TYPE);
        if (typeAttr != null && EdmSimpleType.isGeospatial(typeAttr.getTextContent())) {
            jgen.writeStringField(
                    propType ? ODataConstants.JSON_TYPE : childName + "@" + ODataConstants.JSON_TYPE,
                    typeAttr.getTextContent());

            jgen.writeObjectFieldStart(childName);
            GeospatialJSONHandler.serialize(jgen, (Element) child, typeAttr.getTextContent());
            jgen.writeEndObject();
        } else if (XMLUtils.hasOnlyTextChildNodes(child)) {
            if (child.hasChildNodes()) {
                final String out;
                if (typeAttr == null) {
                    out = child.getChildNodes().item(0).getNodeValue();
                } else {
                    final EdmSimpleType type = EdmSimpleType.fromValue(typeAttr.getTextContent());
                    final ODataPrimitiveValue value = client.getPrimitiveValueBuilder().setType(type)
                            .setText(child.getChildNodes().item(0).getNodeValue()).build();
                    out = value.toString();

                    jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE, type.toString());
                }
                jgen.writeStringField(childName, out);
            } else {
                if (child.getAttributes().getNamedItem(ODataConstants.ATTR_NULL) == null) {
                    if (typeAttr != null && EdmSimpleType.String.toString().equals(typeAttr.getTextContent())) {
                        jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE,
                                typeAttr.getTextContent());
                        jgen.writeStringField(childName, StringUtils.EMPTY);
                    } else {
                        jgen.writeArrayFieldStart(childName);
                        jgen.writeEndArray();
                    }
                } else {
                    jgen.writeNullField(childName);
                }
            }
        } else {
            if (XMLUtils.hasElementsChildNode(child)) {
                jgen.writeArrayFieldStart(childName);

                for (Node nephew : XMLUtils.getChildNodes(child, Node.ELEMENT_NODE)) {
                    if (XMLUtils.hasOnlyTextChildNodes(nephew)) {
                        jgen.writeString(nephew.getChildNodes().item(0).getNodeValue());
                    } else {
                        jgen.writeStartObject();
                        DOMTreeUtils.writeSubtree(client, jgen, nephew);
                        jgen.writeEndObject();
                    }
                }

                jgen.writeEndArray();
            } else {
                jgen.writeObjectFieldStart(childName);
                if (typeAttr != null) {
                    jgen.writeStringField(ODataConstants.JSON_TYPE, typeAttr.getTextContent());
                }

                DOMTreeUtils.writeSubtree(client, jgen, child);

                jgen.writeEndObject();
            }
        }
    }
}

From source file:com.msopentech.odatajclient.engine.data.json.DOMTreeUtils.java

/**
 * Serializes DOM content as JSON.//from w  w w .  j a v  a  2 s  .  c  o m
 *
 * @param jgen JSON generator.
 * @param content content.
 * @param propType whether to output type information in the way needed for property values or not.
 * @throws IOException in case of write error.
 */
public static void writeSubtree(final JsonGenerator jgen, final Node content, final boolean propType)
        throws IOException {

    for (Node child : XMLUtils.getChildNodes(content, Node.ELEMENT_NODE)) {
        final String childName = XMLUtils.getSimpleName(child);

        final Node typeAttr = child.getAttributes().getNamedItem(ODataConstants.ATTR_M_TYPE);
        if (typeAttr != null && EdmSimpleType.isGeospatial(typeAttr.getTextContent())) {
            jgen.writeStringField(
                    propType ? ODataConstants.JSON_TYPE : childName + "@" + ODataConstants.JSON_TYPE,
                    typeAttr.getTextContent());

            jgen.writeObjectFieldStart(childName);
            GeospatialJSONHandler.serialize(jgen, (Element) child, typeAttr.getTextContent());
            jgen.writeEndObject();
        } else if (XMLUtils.hasOnlyTextChildNodes(child)) {
            if (child.hasChildNodes()) {
                final String out;
                if (typeAttr == null) {
                    out = child.getChildNodes().item(0).getNodeValue();
                } else {
                    final EdmSimpleType type = EdmSimpleType.fromValue(typeAttr.getTextContent());
                    final ODataPrimitiveValue value = new ODataPrimitiveValue.Builder().setType(type)
                            .setText(child.getChildNodes().item(0).getNodeValue()).build();
                    out = value.toString();

                    jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE, type.toString());
                }
                jgen.writeStringField(childName, out);
            } else {
                if (child.getAttributes().getNamedItem(ODataConstants.ATTR_NULL) == null) {
                    if (typeAttr != null && EdmSimpleType.String.toString().equals(typeAttr.getTextContent())) {
                        jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE,
                                typeAttr.getTextContent());
                        jgen.writeStringField(childName, StringUtils.EMPTY);
                    } else {
                        jgen.writeArrayFieldStart(childName);
                        jgen.writeEndArray();
                    }
                } else {
                    jgen.writeNullField(childName);
                }
            }
        } else {
            if (XMLUtils.hasElementsChildNode(child)) {
                jgen.writeArrayFieldStart(childName);

                for (Node nephew : XMLUtils.getChildNodes(child, Node.ELEMENT_NODE)) {
                    if (XMLUtils.hasOnlyTextChildNodes(nephew)) {
                        jgen.writeString(nephew.getChildNodes().item(0).getNodeValue());
                    } else {
                        jgen.writeStartObject();
                        writeSubtree(jgen, nephew);
                        jgen.writeEndObject();
                    }
                }

                jgen.writeEndArray();
            } else {
                jgen.writeObjectFieldStart(childName);
                if (typeAttr != null) {
                    jgen.writeStringField(ODataConstants.JSON_TYPE, typeAttr.getTextContent());
                }

                writeSubtree(jgen, child);

                jgen.writeEndObject();
            }
        }
    }
}

From source file:com.msopentech.odatajclient.engine.data.impl.JSONDOMTreeUtils.java

/**
 * Serializes DOM content as JSON.//  w w w .  j a va  2  s  .c  o  m
 *
 * @param client OData client.
 * @param jgen JSON generator.
 * @param content content.
 * @param propType whether to output type information in the way needed for property values or not.
 * @throws IOException in case of write error.
 */
public static void writeSubtree(final ODataClient client, final JsonGenerator jgen, final Node content,
        final boolean propType) throws IOException {

    for (Node child : XMLUtils.getChildNodes(content, Node.ELEMENT_NODE)) {
        final String childName = XMLUtils.getSimpleName(child);

        final Node typeAttr = child.getAttributes().getNamedItem(ODataConstants.ATTR_M_TYPE);
        if (typeAttr != null && EdmSimpleType.isGeospatial(typeAttr.getTextContent())) {
            jgen.writeStringField(
                    propType ? ODataConstants.JSON_TYPE : childName + "@" + ODataConstants.JSON_TYPE,
                    typeAttr.getTextContent());

            jgen.writeObjectFieldStart(childName);
            GeospatialJSONHandler.serialize(client, jgen, (Element) child, typeAttr.getTextContent());
            jgen.writeEndObject();
        } else if (XMLUtils.hasOnlyTextChildNodes(child)) {
            if (child.hasChildNodes()) {
                final String out;
                if (typeAttr == null) {
                    out = child.getChildNodes().item(0).getNodeValue();
                } else {
                    final EdmSimpleType type = EdmSimpleType.fromValue(typeAttr.getTextContent());
                    final ODataPrimitiveValue value = client.getPrimitiveValueBuilder().setType(type)
                            .setText(child.getChildNodes().item(0).getNodeValue()).build();
                    out = value.toString();

                    jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE, type.toString());
                }
                jgen.writeStringField(childName, out);
            } else {
                if (child.getAttributes().getNamedItem(ODataConstants.ATTR_NULL) == null) {
                    if (typeAttr != null && EdmSimpleType.String.toString().equals(typeAttr.getTextContent())) {
                        jgen.writeStringField(childName + "@" + ODataConstants.JSON_TYPE,
                                typeAttr.getTextContent());
                        jgen.writeStringField(childName, StringUtils.EMPTY);
                    } else {
                        jgen.writeArrayFieldStart(childName);
                        jgen.writeEndArray();
                    }
                } else {
                    jgen.writeNullField(childName);
                }
            }
        } else {
            if (XMLUtils.hasElementsChildNode(child)) {
                jgen.writeArrayFieldStart(childName);

                for (Node nephew : XMLUtils.getChildNodes(child, Node.ELEMENT_NODE)) {
                    if (XMLUtils.hasOnlyTextChildNodes(nephew)) {
                        jgen.writeString(nephew.getChildNodes().item(0).getNodeValue());
                    } else {
                        jgen.writeStartObject();
                        writeSubtree(client, jgen, nephew);
                        jgen.writeEndObject();
                    }
                }

                jgen.writeEndArray();
            } else {
                jgen.writeObjectFieldStart(childName);
                if (typeAttr != null) {
                    jgen.writeStringField(ODataConstants.JSON_TYPE, typeAttr.getTextContent());
                }

                writeSubtree(client, jgen, child);

                jgen.writeEndObject();
            }
        }
    }
}