org.json.JSONObject.isNull()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中org.json.JSONObject.isNull()方法的一些代码示例，展示了JSONObject.isNull()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。JSONObject.isNull()方法的具体详情如下：
包路径：org.json.JSONObject
类名称：JSONObject
方法名：isNull

JSONObject.isNull介绍

[英]Returns true if this object has no mapping for name or if it has a mapping whose value is #NULL.
[中]如果此对象没有名称映射或其值为#NULL的映射，则返回true。

代码示例

代码示例来源：origin: stackoverflow.com

/** Return the value mapped by the given key, or {@code null} if not present or null. */
public static String optString(JSONObject json, String key)
{
  // http://code.google.com/p/android/issues/detail?id=13830
  if (json.isNull(key))
    return null;
  else
    return json.optString(key, null);
}

代码示例来源：origin: stackoverflow.com

private String optString_1(final JSONObject json, final String key) {
  return json.isNull(key) ? null : json.optString(key);
}

代码示例来源：origin: googlemaps/android-maps-utils

/**
 * Parses the properties of a GeoJSON feature into a hashmap
 *
 * @param properties GeoJSON properties member
 * @return hashmap containing property values
 * @throws JSONException if the properties could not be parsed
 */
private static HashMap<String, String> parseProperties(JSONObject properties)
    throws JSONException {
  HashMap<String, String> propertiesMap = new HashMap<String, String>();
  Iterator propertyKeys = properties.keys();
  while (propertyKeys.hasNext()) {
    String key = (String) propertyKeys.next();
    propertiesMap.put(key, properties.isNull(key) ? null : properties.getString(key));
  }
  return propertiesMap;
}

代码示例来源：origin: googlemaps/android-maps-utils

public List<MyItem> read(InputStream inputStream) throws JSONException {
  List<MyItem> items = new ArrayList<MyItem>();
  String json = new Scanner(inputStream).useDelimiter(REGEX_INPUT_BOUNDARY_BEGINNING).next();
  JSONArray array = new JSONArray(json);
  for (int i = 0; i < array.length(); i++) {
    String title = null;
    String snippet = null;
    JSONObject object = array.getJSONObject(i);
    double lat = object.getDouble("lat");
    double lng = object.getDouble("lng");
    if (!object.isNull("title")) {
      title = object.getString("title");
    }
    if (!object.isNull("snippet")) {
      snippet = object.getString("snippet");
    }
    items.add(new MyItem(lat, lng, title, snippet));
  }
  return items;
}

代码示例来源：origin: googlemaps/android-maps-utils

boundingBox = parseBoundingBox(geoJsonFeature.getJSONArray(BOUNDING_BOX));
if (geoJsonFeature.has(FEATURE_GEOMETRY) && !geoJsonFeature.isNull(FEATURE_GEOMETRY)) {
  geometry = parseGeometry(geoJsonFeature.getJSONObject(FEATURE_GEOMETRY));
if (geoJsonFeature.has(PROPERTIES) && !geoJsonFeature.isNull(PROPERTIES)) {
  properties = parseProperties(geoJsonFeature.getJSONObject("properties"));

代码示例来源：origin: RipMeApp/ripme

parseJsonChild(children.getJSONObject(j));
if (data.has("after") && !data.isNull("after")) {
  String nextURLString = Utils.stripURLParameter(url.toExternalForm(), "after");
  if (nextURLString.contains("?")) {

代码示例来源：origin: internetarchive/heritrix3

Frontier frontier, JSONObject params) throws IOException {
boolean includeSuccesses = !params.isNull("includeSuccesses");
boolean includeFailures = !params.isNull("includeFailures");
boolean includeScheduleds = !params.isNull("includeScheduleds");
boolean scopeIncludes = !params.isNull("scopeIncludes");

代码示例来源：origin: internetarchive/heritrix3

int qLines = 0;
boolean scheduleSuccesses = !params.isNull("scheduleSuccesses");
boolean scheduleFailures = !params.isNull("scheduleFailures");
boolean scheduleScheduleds = !params.isNull("scheduleScheduleds");
boolean scopeScheduleds = !params.isNull("scopeScheduleds");
boolean forceRevisit = !params.isNull("forceRevisit");

代码示例来源：origin: internetarchive/heritrix3

boolean forceRevisit = !params.isNull("forceRevisit");
boolean asSeeds = !params.isNull("asSeeds");
boolean scopeScheduleds = !params.isNull("scopeScheduleds");
DecideRule scope = scopeScheduleds ? getScope() : null;
try {

代码示例来源：origin: DV8FromTheWorld/JDA

public static long optLong(JSONObject object, String key, long defaultValue)
  {
    return object.isNull(key) ? defaultValue : object.getLong(key);
  }
}

代码示例来源：origin: DV8FromTheWorld/JDA

public static boolean optBoolean(JSONObject object, String key)
{
  return !object.isNull(key) && object.getBoolean(key);
}

代码示例来源：origin: DV8FromTheWorld/JDA

public static int optInt(JSONObject object, String key, int defaultValue)
{
  return object.isNull(key) ? defaultValue : object.getInt(key);
}

代码示例来源：origin: DV8FromTheWorld/JDA

private <T> List<T> map(JSONObject jsonObject, String key, Function<JSONObject, T> convert)
  {
    if (jsonObject.isNull(key))
      return Collections.emptyList();

    final JSONArray arr = jsonObject.getJSONArray(key);
    final List<T> mappedObjects = new ArrayList<>(arr.length());
    for (int i = 0; i < arr.length(); i++)
    {
      JSONObject obj = arr.getJSONObject(i);
      mappedObjects.add(convert.apply(obj));
    }

    return mappedObjects;
  }
}

代码示例来源：origin: DV8FromTheWorld/JDA

public static ErrorResponse fromJSON(JSONObject obj)
  {
    if (obj == null || obj.isNull("code"))
      return SERVER_ERROR;
    else
    {
      return ErrorResponse.fromCode(obj.getInt("code"));
    }
  }
}

代码示例来源：origin: DV8FromTheWorld/JDA

private Member(JSONObject json, Widget widget)
{
  this.widget = widget;
  this.bot = Helpers.optBoolean(json, "bot");
  this.id = json.getLong("id");
  this.username = json.getString("username");
  this.discriminator = json.getString("discriminator");
  this.avatar = json.optString("avatar", null);
  this.nickname = json.optString("nick", null);
  this.status = OnlineStatus.fromKey(json.getString("status"));
  this.game = json.isNull("game") ? null : EntityBuilder.createGame(json.getJSONObject("game"));
}

代码示例来源：origin: DV8FromTheWorld/JDA

public AuditLogChange createAuditLogChange(JSONObject change)
{
  final String key = change.getString("key");
  Object oldValue = change.isNull("old_value") ? null : change.get("old_value");
  Object newValue = change.isNull("new_value") ? null : change.get("new_value");
  // Don't confront users with JSON
  if (oldValue instanceof JSONArray || newValue instanceof JSONArray)
  {
    oldValue = oldValue instanceof JSONArray ? ((JSONArray) oldValue).toList() : oldValue;
    newValue = newValue instanceof JSONArray ? ((JSONArray) newValue).toList() : newValue;
  }
  else if (oldValue instanceof JSONObject || newValue instanceof JSONObject)
  {
    oldValue = oldValue instanceof JSONObject ? ((JSONObject) oldValue).toMap() : oldValue;
    newValue = newValue instanceof JSONObject ? ((JSONObject) newValue).toMap() : newValue;
  }
  return new AuditLogChange(oldValue, newValue, key);
}

代码示例来源：origin: DV8FromTheWorld/JDA

private void createGuildEmotePass(GuildImpl guildObj, JSONArray array)
{
  if (!getJDA().isCacheFlagSet(CacheFlag.EMOTE))
    return;
  TLongObjectMap<Emote> emoteMap = guildObj.getEmoteMap();
  for (int i = 0; i < array.length(); i++)
  {
    JSONObject object = array.getJSONObject(i);
    if (object.isNull("id"))
    {
      LOG.error("Received GUILD_CREATE with an emoji with a null ID. JSON: {}", object);
      continue;
    }
    final long emoteId = object.getLong("id");
    emoteMap.put(emoteId, createEmote(guildObj, object, false));
  }
}

代码示例来源：origin: DV8FromTheWorld/JDA

public void onCreate(long id, JSONObject obj)
{
  boolean available = obj.isNull("unavailable") || !obj.getBoolean("unavailable");
  log.trace("Received guild create for id: {} available: {}", id, available);
  GuildSetupNode node = setupNodes.get(id);
  if (node == null)
  {
    // this is a join event
    node = new GuildSetupNode(id, this, true);
    setupNodes.put(id, node);
    // do not increment incomplete counter, it is only relevant to init guilds
  }
  else if (node.markedUnavailable && available && incompleteCount > 0)
  {
    //Looks like this guild decided to become available again during startup
    // that means we can now consider it for ReadyEvent status again!
    if (node.sync)
      syncingCount++;
    incompleteCount++;
  }
  node.handleCreate(obj);
}

代码示例来源：origin: DV8FromTheWorld/JDA

@Override
protected Long handleInternally(JSONObject content)
{
  final Long guildId = content.isNull("guild_id") ? null : content.getLong("guild_id");
  if (guildId != null && getJDA().getGuildSetupController().isLocked(guildId))
    return guildId;
  if (guildId != null)
    handleGuildVoiceState(content);
  else
    handleCallVoiceState(content);
  return null;
}

代码示例来源：origin: parse-community/Parse-SDK-Android

/* package for test */ Object convertCloudResponse(Object result) {
    if (result instanceof JSONObject) {
      JSONObject jsonResult = (JSONObject) result;
      // We want to make sure we pass back a null result as null, and not a JSONObject
      if (jsonResult.isNull("result")) {
        return null;
      }
      result = jsonResult.opt("result");
    }

    ParseDecoder decoder = ParseDecoder.get();
    Object finalResult = decoder.decode(result);
    if (finalResult != null) {
      return finalResult;
    }

    return result;
  }
}

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