com.fasterxml.jackson.databind.node.NullNode.getInstance()方法的使用及代码示例

x33g5p2x  于2022-01-24 转载在 其他  
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本文整理了Java中com.fasterxml.jackson.databind.node.NullNode.getInstance()方法的一些代码示例，展示了NullNode.getInstance()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。NullNode.getInstance()方法的具体详情如下：
包路径：com.fasterxml.jackson.databind.node.NullNode
类名称：NullNode
方法名：getInstance

NullNode.getInstance介绍

暂无

代码示例

代码示例来源：origin: redisson/redisson

/**
 * Factory method for getting an instance of JSON null node (which
 * represents literal null value)
 */
@Override
public NullNode nullNode() { return NullNode.getInstance(); }

代码示例来源：origin: redisson/redisson

@Override
public JsonNode getNullValue(DeserializationContext ctxt) {
  return NullNode.getInstance();
}

代码示例来源：origin: aws/aws-sdk-java

@JsonProperty(PropertyNames.PARAMETERS)
public Builder parameters(JsonNode parameters) {
  this.parameters = parameters == null ? NullNode.getInstance() : parameters;
  return this;
}

代码示例来源：origin: aws/aws-sdk-java

/**
 * If an explicit null is set we preserve that in a {@link NullNode} so that we
 * can serialize an explicit JSON null instead of ommitting that field from the JSON object.
 *
 * @return NullNode if path is null, otherwise a TextNode containing the value.
 */
private JsonNode resolvePath(String pathString) {
  if (pathString == null) {
    return NullNode.getInstance();
  }
  return TextNode.valueOf(pathString);
}

代码示例来源：origin: embulk/embulk

@Deprecated
public ToString(com.google.common.base.Optional<JsonNode> option) throws JsonMappingException {
  JsonNode node = option.or(NullNode.getInstance());
  if (node.isTextual()) {
    this.string = node.textValue();
  } else if (node.isValueNode()) {
    this.string = node.toString();
  } else {
    throw new JsonMappingException(String.format("Arrays and objects are invalid: '%s'", node));
  }
}

代码示例来源：origin: embulk/embulk

@JsonCreator
public ToString(final Optional<JsonNode> option) throws JsonMappingException {
  final JsonNode node = option.orElse(NullNode.getInstance());
  if (node.isTextual()) {
    this.string = node.textValue();
  } else if (node.isValueNode()) {
    this.string = node.toString();
  } else {
    throw new JsonMappingException(String.format("Arrays and objects are invalid: '%s'", node));
  }
}

代码示例来源：origin: docker-java/docker-java

@Override
  public ExposedPort deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);
    if (!node.equals(NullNode.getInstance())) {
      Entry<String, JsonNode> field = node.fields().next();
      return ExposedPort.parse(field.getKey());
    } else {
      return null;
    }
  }
}

代码示例来源：origin: docker-java/docker-java

@Override
  public ExposedPorts deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    List<ExposedPort> exposedPorts = new ArrayList<ExposedPort>();
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);
    for (Iterator<Map.Entry<String, JsonNode>> it = node.fields(); it.hasNext();) {
      Map.Entry<String, JsonNode> field = it.next();
      if (!field.getValue().equals(NullNode.getInstance())) {
        exposedPorts.add(ExposedPort.parse(field.getKey()));
      }
    }
    return new ExposedPorts(exposedPorts.toArray(new ExposedPort[0]));
  }
}

代码示例来源：origin: aws/aws-sdk-java

/**
 * Retrieves the value of the field node
 *
 * @param fieldNode JmesPath field type
 * @param input     Input json node whose value is
 *                  retrieved
 * @return Value of the input json node
 */
@Override
public JsonNode visit(JmesPathField fieldNode, JsonNode input) {
  if (input.isObject()) {
    //TODO : CamelCase will need to change at some point
    return input.get(CamelCaseUtils.toCamelCase(fieldNode.getValue()));
  }
  return NullNode.getInstance();
}

代码示例来源：origin: docker-java/docker-java

@Override
  public Links deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    final List<Link> binds = new ArrayList<Link>();
    final ObjectCodec oc = jsonParser.getCodec();
    final JsonNode node = oc.readTree(jsonParser);
    for (final Iterator<JsonNode> it = node.elements(); it.hasNext();) {
      final JsonNode element = it.next();
      if (!element.equals(NullNode.getInstance())) {
        binds.add(Link.parse(element.asText()));
      }
    }
    return new Links(binds.toArray(new Link[0]));
  }
}

代码示例来源：origin: docker-java/docker-java

@Override
  public Volumes deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    List<Volume> volumes = new ArrayList<Volume>();
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);
    for (Iterator<Map.Entry<String, JsonNode>> it = node.fields(); it.hasNext();) {
      Map.Entry<String, JsonNode> field = it.next();
      if (!field.getValue().equals(NullNode.getInstance())) {
        String path = field.getKey();
        Volume volume = new Volume(path);
        volumes.add(volume);
      }
    }
    return new Volumes(volumes.toArray(new Volume[0]));
  }
}

代码示例来源：origin: docker-java/docker-java

@Override
  public VolumeRW deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException, JsonProcessingException {
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);
    if (!node.equals(NullNode.getInstance())) {
      Entry<String, JsonNode> field = node.fields().next();
      String volume = field.getKey();
      AccessMode accessMode = AccessMode.fromBoolean(field.getValue().asBoolean());
      return new VolumeRW(new Volume(volume), accessMode);
    } else {
      return null;
    }
  }
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldGetNullStringWhenParsingNullNode() throws Exception {
  Map<String, JsonNode> tree = new HashMap<>();
  NullNode node = NullNode.getInstance();
  tree.put("key", node);
  String text = deserializer.getString(tree, "key");
  assertThat(text, is(nullValue()));
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldGetNullDateWhenParsingNullNode() throws Exception {
  Map<String, JsonNode> tree = new HashMap<>();
  NullNode node = NullNode.getInstance();
  tree.put("key", node);
  Date date = deserializer.getDateFromSeconds(tree, "key");
  assertThat(date, is(nullValue()));
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldGetNullStringWhenParsingNullNode() throws Exception {
  Map<String, JsonNode> tree = new HashMap<>();
  NullNode node = NullNode.getInstance();
  tree.put("key", node);
  String text = deserializer.getString(tree, "key");
  assertThat(text, is(nullValue()));
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldGetNullArrayWhenParsingNullNode() throws Exception {
  Map<String, JsonNode> tree = new HashMap<>();
  NullNode node = NullNode.getInstance();
  tree.put("key", node);
  List<String> values = deserializer.getStringOrArray(tree, "key");
  assertThat(values, is(nullValue()));
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldHaveTree() throws Exception {
  HashMap<String, JsonNode> map = new HashMap<>();
  JsonNode node = NullNode.getInstance();
  map.put("key", node);
  BasicHeader header = new BasicHeader(null, null, null, null, map, objectReader);
  assertThat(header.getTree(), is(notNullValue()));
  assertThat(header.getTree(), is(IsMapContaining.hasEntry("key", node)));
}

代码示例来源：origin: Graylog2/graylog2-server

public static Entity createRoot(ContentPack contentPack) {
  return EntityV1.builder()
      .type(ModelTypes.ROOT)
      .id(ModelId.of("virtual-root-" + contentPack.id() + "-" + contentPack.revision()))
      .data(NullNode.getInstance())
      .constraints(ImmutableSet.of())
      .build();
}

代码示例来源：origin: auth0/java-jwt

@Test
public void shouldReturnBaseClaimWhenParsingNullNode() throws Exception {
  JsonNode value = NullNode.getInstance();
  Claim claim = claimFromNode(value);
  assertThat(claim, is(notNullValue()));
  assertThat(claim, is(instanceOf(NullClaim.class)));
  assertThat(claim.isNull(), is(true));
}

代码示例来源：origin: apache/avro

@Test
public void testToJsonNode() {
 assertEquals(null, toJsonNode(null));
 assertEquals(NullNode.getInstance(), toJsonNode(JsonProperties.NULL_VALUE));
 assertEquals(BooleanNode.TRUE, toJsonNode(true));
 assertEquals(IntNode.valueOf(1), toJsonNode(1));
 assertEquals(LongNode.valueOf(2), toJsonNode(2L));
 assertEquals(FloatNode.valueOf(1.0f), toJsonNode(1.0f));
 assertEquals(DoubleNode.valueOf(2.0), toJsonNode(2.0));
 assertEquals(TextNode.valueOf("\u0001\u0002"), toJsonNode(new byte[] { 1, 2 }));
 assertEquals(TextNode.valueOf("a"), toJsonNode("a"));
 assertEquals(TextNode.valueOf("UP"), toJsonNode(Direction.UP));
 ArrayNode an = JsonNodeFactory.instance.arrayNode();
 an.add(1);
 assertEquals(an, toJsonNode(Collections.singletonList(1)));
 ObjectNode on = JsonNodeFactory.instance.objectNode();
 on.put("a", 1);
 assertEquals(on, toJsonNode(Collections.singletonMap("a", 1)));
}

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