Example usage for com.google.gson JsonElement isJsonNull

List of usage examples for com.google.gson JsonElement isJsonNull

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Introduction

In this page you can find the example usage for com.google.gson JsonElement isJsonNull.

Prototype

public boolean isJsonNull()

Source Link

Document

provides check for verifying if this element represents a null value or not.

Usage

From source file:org.apache.twill.internal.json.JsonUtils.java

License:Apache License

/**
 * Returns a String representation of the given property.
 *//*from  w  w w.  j  a v a  2s. c  o m*/
public static String getAsString(JsonObject json, String property) {
    JsonElement jsonElement = json.get(property);
    if (jsonElement == null || jsonElement.isJsonNull()) {
        return null;
    }
    if (jsonElement.isJsonPrimitive()) {
        return jsonElement.getAsString();
    }
    return jsonElement.toString();
}

From source file:org.apache.twill.internal.json.TwillSpecificationCodec.java

License:Apache License

@Override
public TwillSpecification deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
        throws JsonParseException {
    JsonObject jsonObj = json.getAsJsonObject();

    String name = jsonObj.get("name").getAsString();
    Map<String, RuntimeSpecification> runnables = context.deserialize(jsonObj.get("runnables"),
            new TypeToken<Map<String, RuntimeSpecification>>() {
            }.getType());/*from w ww.j  a va 2  s.  com*/
    List<TwillSpecification.Order> orders = context.deserialize(jsonObj.get("orders"),
            new TypeToken<List<TwillSpecification.Order>>() {
            }.getType());
    List<TwillSpecification.PlacementPolicy> placementPolicies = context.deserialize(
            jsonObj.get("placementPolicies"), new TypeToken<List<TwillSpecification.PlacementPolicy>>() {
            }.getType());

    JsonElement handler = jsonObj.get("handler");
    EventHandlerSpecification eventHandler = null;
    if (handler != null && !handler.isJsonNull()) {
        eventHandler = context.deserialize(handler, EventHandlerSpecification.class);
    }

    return new DefaultTwillSpecification(name, runnables, orders, placementPolicies, eventHandler);
}

From source file:org.coding.git.api.CodingNetConnection.java

License:Apache License

@NotNull
private ResponsePage doRequest(@NotNull String uri, @Nullable String requestBody,
        @NotNull Collection<Header> headers, @NotNull HttpVerb verb) throws IOException {
    if (myAborted)
        throw new CodingNetOperationCanceledException();

    if (EventQueue.isDispatchThread() && !ApplicationManager.getApplication().isUnitTestMode()) {
        LOG.warn("Network operation in EDT"); // TODO: fix
    }//from w ww  . ja  v  a2  s .c  o  m

    CloseableHttpResponse response = null;
    try {
        response = doREST(uri, requestBody, headers, verb);

        if (myAborted)
            throw new CodingNetOperationCanceledException();

        //--HTTP??
        checkStatusCode(response, requestBody);

        HttpEntity entity = response.getEntity();
        if (entity == null) {
            return createResponse(response);
        }

        JsonElement ret = parseResponse(entity.getContent());
        if (ret.isJsonNull()) {
            return createResponse(response);
        }

        //--CodingNet??
        checkCodingNetCode(ret);

        String nextPage = null;
        Header pageHeader = response.getFirstHeader("Link");
        if (pageHeader != null) {
            for (HeaderElement element : pageHeader.getElements()) {
                NameValuePair rel = element.getParameterByName("rel");
                if (rel != null && "next".equals(rel.getValue())) {
                    String urlString = element.toString();
                    int begin = urlString.indexOf('<');
                    int end = urlString.lastIndexOf('>');
                    if (begin == -1 || end == -1) {
                        LOG.error("Invalid 'Link' header", "{" + pageHeader.toString() + "}");
                        break;
                    }

                    nextPage = urlString.substring(begin + 1, end);
                    break;
                }
            }
        }

        return createResponse(ret, nextPage, response);
    } catch (SSLHandshakeException e) { // User canceled operation from CertificateManager
        if (e.getCause() instanceof CertificateException) {
            LOG.info("Host SSL certificate is not trusted", e);
            throw new CodingNetOperationCanceledException("Host SSL certificate is not trusted", e);
        }
        throw e;
    } catch (IOException e) {
        if (myAborted)
            throw new CodingNetOperationCanceledException("Operation canceled", e);
        throw e;
    } finally {
        myRequest = null;
        if (response != null) {
            response.close();
        }
        if (!myReusable) {
            myClient.close();
        }
    }
}

From source file:org.couchbase.mock.subdoc.Path.java

License:Apache License

public void validateComponentType(int ix, JsonElement parent) throws PathMismatchException {
    Component comp = components.get(ix);
    if (parent.isJsonPrimitive() || parent.isJsonNull()) {
        throw new PathMismatchException();
    }/*ww w. jav  a  2 s .c o  m*/

    if (comp.isIndex()) {
        if (!parent.isJsonArray()) {
            throw new PathMismatchException();
        }
    } else {
        if (!parent.isJsonObject()) {
            throw new PathMismatchException();
        }
    }
}

From source file:org.dashbuilder.dataprovider.backend.elasticsearch.rest.client.impl.jest.ElasticSearchJestClient.java

License:Apache License

/**
 * Parses a given value (for a given column type) returned by response JSON query body from EL server.
 *
 * @param column       The data column definition.
 * @param valueElement The value element from JSON query response to format.
 * @return The formatted value for the given column type.
 *///  w  w w. j  a  v  a 2s .  c o m
public static Object parseValue(ElasticSearchDataSetDef definition, ElasticSearchDataSetMetadata metadata,
        DataColumn column, JsonElement valueElement) {
    if (column == null || valueElement == null || valueElement.isJsonNull())
        return null;
    if (!valueElement.isJsonPrimitive())
        throw new RuntimeException("Not expected JsonElement type to parse from query response.");

    JsonPrimitive valuePrimitive = valueElement.getAsJsonPrimitive();

    ColumnType columnType = column.getColumnType();

    if (ColumnType.NUMBER.equals(columnType)) {

        return valueElement.getAsDouble();

    } else if (ColumnType.DATE.equals(columnType)) {

        // We can expect two return core types from EL server when handling dates:
        // 1.- String type, using the field pattern defined in the index' mappings, when it's result of a query without aggregations.
        // 2.- Numeric type, when it's result from a scalar function or a value pickup.

        if (valuePrimitive.isString()) {

            DateTimeFormatter formatter = null;
            String datePattern = metadata.getFieldPattern(column.getId());
            if (datePattern == null || datePattern.trim().length() == 0) {
                // If no custom pattern for date field, use the default by EL -> org.joda.time.format.ISODateTimeFormat#dateOptionalTimeParser
                formatter = ElasticSearchDataSetProvider.EL_DEFAULT_DATETIME_FORMATTER;
            } else {
                // Obtain the date value by parsing using the EL pattern specified for this field.
                formatter = DateTimeFormat.forPattern(datePattern);
            }

            DateTime dateTime = formatter.parseDateTime(valuePrimitive.getAsString());
            return dateTime.toDate();
        }

        if (valuePrimitive.isNumber()) {

            return new Date(valuePrimitive.getAsLong());

        }

        throw new UnsupportedOperationException(
                "Value core type not supported. Expecting string or number when using date core field types.");

    }

    // LABEL, TEXT or grouped DATE column types.
    String valueAsString = valueElement.getAsString();
    ColumnGroup columnGroup = column.getColumnGroup();

    // For FIXED date values, remove the unnecessary "0" at first character. (eg: replace month "01" to "1")
    if (columnGroup != null && GroupStrategy.FIXED.equals(columnGroup.getStrategy())
            && valueAsString.startsWith("0"))
        return valueAsString.substring(1);

    return valueAsString;
}

From source file:org.dashbuilder.dataprovider.backend.elasticsearch.rest.impl.jest.ElasticSearchJestClient.java

License:Apache License

/**
 * Parses a given value (for a given column type) returned by response JSON query body from EL server.
 *
 * @param column       The data column definition.
 * @param valueElement The value element from JSON query response to format.
 * @return The object value for the given column type.
 *///from w ww .java  2 s  .  c  o  m
public Object parseValue(DataSetMetadata metadata, DataColumn column, JsonElement valueElement)
        throws ParseException {
    if (column == null || valueElement == null || valueElement.isJsonNull())
        return null;
    if (!valueElement.isJsonPrimitive())
        throw new RuntimeException("Not expected JsonElement type to parse from query response.");

    ElasticSearchDataSetDef def = (ElasticSearchDataSetDef) metadata.getDefinition();
    JsonPrimitive valuePrimitive = valueElement.getAsJsonPrimitive();
    ColumnType columnType = column.getColumnType();

    if (ColumnType.TEXT.equals(columnType)) {
        return typeMapper.parseText(def, column.getId(), valueElement.getAsString());
    } else if (ColumnType.LABEL.equals(columnType)) {
        boolean isColumnGroup = column.getColumnGroup() != null
                && column.getColumnGroup().getStrategy().equals(GroupStrategy.FIXED);
        return typeMapper.parseLabel(def, column.getId(), valueElement.getAsString(), isColumnGroup);

    } else if (ColumnType.NUMBER.equals(columnType)) {
        return typeMapper.parseNumeric(def, column.getId(), valueElement.getAsString());

    } else if (ColumnType.DATE.equals(columnType)) {

        // We can expect two return core types from EL server when handling dates:
        // 1.- String type, using the field pattern defined in the index' mappings, when it's result of a query without aggregations.
        // 2.- Numeric type, when it's result from a scalar function or a value pickup.

        if (valuePrimitive.isString()) {
            return typeMapper.parseDate(def, column.getId(), valuePrimitive.getAsString());
        }

        if (valuePrimitive.isNumber()) {
            return typeMapper.parseDate(def, column.getId(), valuePrimitive.getAsLong());
        }

    }

    throw new UnsupportedOperationException("Cannot parse value for column with id [" + column.getId()
            + "] (Data Set UUID [" + def.getUUID()
            + "]). Value core type not supported. Expecting string or number or date core field types.");

}

From source file:org.debux.webmotion.server.call.ClientSession.java

License:Open Source License

/**
 * Return only JsonElement use getAttribute and getAttributes with class as 
 * parameter to get a value./*from   w w w  .  j a v a  2  s . c  o m*/
 */
@Override
public Object getAttribute(String name) {
    JsonElement value = attributes.get(name);
    if (value == null) {
        return value;

    } else if (value.isJsonPrimitive()) {
        JsonPrimitive primitive = value.getAsJsonPrimitive();
        if (primitive.isString()) {
            return primitive.getAsString();

        } else if (primitive.isBoolean()) {
            return primitive.getAsBoolean();

        } else if (primitive.isNumber()) {
            return primitive.getAsDouble();
        }

    } else if (value.isJsonArray()) {
        return value.getAsJsonArray();

    } else if (value.isJsonObject()) {
        return value.getAsJsonObject();

    } else if (value.isJsonNull()) {
        return value.getAsJsonNull();
    }
    return value;
}

From source file:org.dmu.expertiserecognition.doiResults.java

private doiResults extractFullAuthorList(String jsonresp, String alt) throws Exception {
    doiResults dr = new doiResults(standardizeAuthorName(alt));
    ArrayList<String> strlst = new ArrayList<>();
    JsonElement json = new JsonParser().parse(jsonresp);
    JsonArray array = json.getAsJsonArray();
    if (array.iterator().hasNext() == false) {
        return dr;
    }//from  ww  w.jav a2s  .  c om
    JsonElement elem = array.iterator().next();
    JsonObject jsonobj = elem.getAsJsonObject();
    String coins = URLDecoder.decode(jsonobj.get("coins").getAsString(), "UTF-8");
    String[] coinlist = coins.split("&amp;");
    int i;
    String[] pair;
    for (i = 0; i < coinlist.length; i++) {
        pair = coinlist[i].split("=");
        if ((pair.length >= 2) && (pair[0].trim().equalsIgnoreCase("rft.au"))) {
            strlst.add(standardizeAuthorName(pair[1]));
        }
    }
    dr.authList = strlst;
    StringBuilder sb = new StringBuilder("<a href=\"");
    sb.append(jsonobj.get("doi").getAsString());
    sb.append("\" target=\"_blank\">");
    sb.append(jsonobj.get("fullCitation").getAsString());
    sb.append("</a>");
    dr.citation = sb.toString();

    // Adding "year" field verification; it may come as null 
    // (translated by Gson as a JsonNull field)
    JsonElement year = jsonobj.get("year");
    if (year == null || year.isJsonNull()) {
        dr.year = "N/A";
    } else {
        dr.year = year.getAsString();
    }

    return dr;
}

From source file:org.dmu.expertiserecognition.ScopusServlet.java

public static boolean checkJsonElement(JsonElement jobj) {
    if (jobj == null)
        return false;
    return !jobj.isJsonNull();
}

From source file:org.dspace.handle.MultiRemoteDSpaceRepositoryHandlePlugin.java

License:BSD License

private String getRemoteDSpaceURL(String handle) throws HandleException {
    if (log.isInfoEnabled()) {
        log.info("Called getRemoteDSpaceURL(" + handle + ").");
    }/*from   ww  w. j  a v a2  s  .  c  o  m*/

    InputStreamReader jsonStreamReader = null;
    String url = null;
    try {
        String prefix = handle.split("/")[0];
        String endpoint = this.prefixes.get(prefix);
        if (endpoint == null) {
            if (log.isDebugEnabled()) {
                log.debug("Cannot find endpoint for prefix " + prefix + ", throw HANDLE_DOES_NOT_EXIST.");
            }
            throw new HandleException(HandleException.HANDLE_DOES_NOT_EXIST);
        }

        String jsonurl = endpoint + "/resolve/" + handle;
        jsonStreamReader = new InputStreamReader(new URL(jsonurl).openStream(), "UTF-8");
        JsonParser parser = new JsonParser();
        JsonElement jsonElement = parser.parse(jsonStreamReader);

        if (jsonElement == null || jsonElement.isJsonNull() || jsonElement.getAsJsonArray().size() == 0
                || jsonElement.getAsJsonArray().get(0).isJsonNull()) {
            if (log.isDebugEnabled()) {
                log.debug("Throw HandleException: HANDLE_DOES_NOT_EXIST.");
            }
            throw new HandleException(HandleException.HANDLE_DOES_NOT_EXIST);
        }

        url = jsonElement.getAsJsonArray().get(0).getAsString();
    } catch (Exception e) {
        if (log.isDebugEnabled()) {
            log.debug("Exception in getRawHandleValues", e);
        }

        // Stack loss as exception does not support cause
        throw new HandleException(HandleException.INTERNAL_ERROR);
    } finally {
        if (jsonStreamReader != null) {
            try {
                jsonStreamReader.close();
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }
    if (log.isDebugEnabled()) {
        log.debug(("getRemoteDspaceURL returns " + url));
    }
    return url;
}