Example usage for com.google.gson JsonElement isJsonNull

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:com.gemapps.saidit.networking.deserializer.TopEntriesDeserializer.java

License:Apache License

private String getAfterTag(JsonElement data) {
    JsonElement after = data.getAsJsonObject().get("after");
    return !after.isJsonNull() ? after.getAsString() : "";
}

From source file:com.gemapps.saidit.networking.deserializer.TopEntriesDeserializer.java

License:Apache License

private String getPictureUrl(JsonElement entryData) {
    JsonElement imagesPreview = entryData.getAsJsonObject().get("preview");
    if (imagesPreview != null && !imagesPreview.isJsonNull()) {
        JsonElement image = getFirstImage(imagesPreview);
        JsonElement url = image.getAsJsonObject().get("url");
        return url.isJsonNull() ? "" : url.getAsString();
    }// w  ww  .  j a v  a2s.c o  m
    return "";
}

From source file:com.getperka.flatpack.ext.Codex.java

License:Apache License

/**
 * Reify the given {@link JsonElement} into a Java value. If {@code} element is {@null} or
 * represents a Json {@code null} value, this method will return {@code null}, otherwise this
 * method will delegate to {@link #readNotNull(JsonElement, DeserializationContext)}.
 * /*www .j a  v a2s  .  c o  m*/
 * @param element the element that contains the value to reify
 * @param context contextual information for the deserialization process
 * @return the requested value
 */
public T read(JsonElement element, DeserializationContext context) {
    if (element == null || element.isJsonNull()) {
        return null;
    }
    context.pushPath("(" + getClass().getSimpleName() + ".read())");
    try {
        return readNotNull(element, context);
    } catch (Exception e) {
        context.fail(e);
        return null;
    } finally {
        context.popPath();
    }
}

From source file:com.github.easyjsonapi.adapters.EasyJsonApiDeserializer.java

License:Apache License

@Override
public JsonApi deserialize(JsonElement jsonElem, Type jsonType, JsonDeserializationContext jsonContext) {

    JsonApi request = new JsonApi();

    if (!jsonElem.isJsonNull()) {

        boolean existJsonFormat = jsonElem.getAsJsonObject().isJsonNull();
        if (!existJsonFormat) {
            if (Assert.notNull(jsonElem.getAsJsonObject().get("data"))) {
                request = deserializerData(jsonElem, jsonContext);
            } else if (Assert.notNull(jsonElem.getAsJsonObject().get("errors"))) {
                request = deserializerError(jsonElem, jsonContext);
            }/*from w ww.ja va 2s . c  o  m*/
        }
    }

    return request;
}

From source file:com.github.GsonPrettyPrinter.java

License:Open Source License

private List<String> toStringList(final JsonElement je) {
    if (je == null || je.isJsonNull())
        return new ArrayList<String>(Arrays.asList(new String[] { "null" }));
    if (je.isJsonPrimitive())
        return Collections.singletonList(je.getAsJsonPrimitive().toString());
    if (je.isJsonArray()) {
        final JsonArray jsonArray = je.getAsJsonArray();
        return arrayToStringList(jsonArray);
    } else if (je.isJsonObject()) {
        final JsonObject jsonObject = je.getAsJsonObject();
        return objectToStringList(jsonObject);
    }//from w  ww .  j  av  a 2s  .co  m
    throw new RuntimeException("Unsupported Json element: " + je.getClass().getName());
}

From source file:com.google.gwtjsonrpc.server.MapDeserializer.java

License:Apache License

public Map<Object, Object> deserialize(final JsonElement json, final Type typeOfT,
        final JsonDeserializationContext context) throws JsonParseException {
    final Type kt = ((ParameterizedType) typeOfT).getActualTypeArguments()[0];
    final Type vt = ((ParameterizedType) typeOfT).getActualTypeArguments()[1];

    if (json.isJsonNull()) {
        return null;
    }// w  w w  . ja  va  2 s.co m

    if (kt == String.class) {
        if (!json.isJsonObject()) {
            throw new JsonParseException("Expected object for map type");
        }
        final JsonObject p = (JsonObject) json;
        final Map<Object, Object> r = createInstance(typeOfT);
        for (final Map.Entry<String, JsonElement> e : p.entrySet()) {
            final Object v = context.deserialize(e.getValue(), vt);
            r.put(e.getKey(), v);
        }
        return r;
    } else {
        if (!json.isJsonArray()) {
            throw new JsonParseException("Expected array for map type");
        }

        final JsonArray p = (JsonArray) json;
        final Map<Object, Object> r = createInstance(typeOfT);
        for (int n = 0; n < p.size();) {
            final Object k = context.deserialize(p.get(n++), kt);
            final Object v = context.deserialize(p.get(n++), vt);
            r.put(k, v);
        }
        return r;
    }
}

From source file:com.google.gwtjsonrpc.server.SqlDateDeserializer.java

License:Apache License

public java.sql.Date deserialize(final JsonElement json, final Type typeOfT,
        final JsonDeserializationContext context) throws JsonParseException {
    if (json.isJsonNull()) {
        return null;
    }//  w ww.j  a  va 2s .com
    if (!json.isJsonPrimitive()) {
        throw new JsonParseException("Expected string for date type");
    }
    final JsonPrimitive p = (JsonPrimitive) json;
    if (!p.isString()) {
        throw new JsonParseException("Expected string for date type");
    }
    try {
        return java.sql.Date.valueOf(p.getAsString());
    } catch (IllegalArgumentException e) {
        throw new JsonParseException("Not a date string");
    }
}

From source file:com.google.gwtjsonrpc.server.SqlTimestampDeserializer.java

License:Apache License

public java.sql.Timestamp deserialize(final JsonElement json, final Type typeOfT,
        final JsonDeserializationContext context) throws JsonParseException {
    if (json.isJsonNull()) {
        return null;
    }// ww w.j a  v  a 2 s . com
    if (!json.isJsonPrimitive()) {
        throw new JsonParseException("Expected string for timestamp type");
    }
    final JsonPrimitive p = (JsonPrimitive) json;
    if (!p.isString()) {
        throw new JsonParseException("Expected string for timestamp type");
    }

    return JavaSqlTimestamp_JsonSerializer.parseTimestamp(p.getAsString());
}

From source file:com.google.wave.api.impl.OperationRequestGsonAdaptor.java

License:Apache License

/**
 * Returns a property of {@code JsonObject} as a {@link String}, then remove
 * that property./*from  w  w w .  j av  a 2 s  .c o m*/
 *
 * @param jsonObject the {@code JsonObject} to get the property from.
 * @param key the key of the property.
 * @return the property as {@link String}, or {@code null} if not found.
 */
private static String getPropertyAsStringThenRemove(JsonObject jsonObject, ParamsProperty key) {
    JsonElement property = jsonObject.get(key.key());
    if (property != null) {
        jsonObject.remove(key.key());
        if (property.isJsonNull()) {
            return null;
        }
        return property.getAsString();
    }
    return null;
}

From source file:com.google.wave.api.RobotSerializer.java

License:Apache License

/**
 * Determines the protocol version of a given operation bundle JSON by
 * inspecting the first operation in the bundle. If it is a
 * {@code robot.notify} operation, and contains {@code protocolVersion}
 * parameter, then this method will return the value of that parameter.
 * Otherwise, this method will return the default version.
 *
 * @param operationBundle the operation bundle to check.
 * @return the wire protocol version of the given operation bundle.
 *//*from  w  ww. j  av  a2  s .  co  m*/
private ProtocolVersion determineProtocolVersion(JsonArray operationBundle) {
    if (operationBundle.size() == 0 || !operationBundle.get(0).isJsonObject()) {
        return defaultProtocolVersion;
    }

    JsonObject firstOperation = operationBundle.get(0).getAsJsonObject();
    if (!firstOperation.has(RequestProperty.METHOD.key())) {
        return defaultProtocolVersion;
    }

    String method = firstOperation.get(RequestProperty.METHOD.key()).getAsString();
    if (isRobotNotifyOperationMethod(method)) {
        JsonObject params = firstOperation.get(RequestProperty.PARAMS.key()).getAsJsonObject();
        if (params.has(ParamsProperty.PROTOCOL_VERSION.key())) {
            JsonElement protocolVersionElement = params.get(ParamsProperty.PROTOCOL_VERSION.key());
            if (!protocolVersionElement.isJsonNull()) {
                return ProtocolVersion.fromVersionString(protocolVersionElement.getAsString());
            }
        }
    }
    return defaultProtocolVersion;
}