MissingNode (Jackson JSON Processor)

java.lang.Object
- org.codehaus.jackson.JsonNode
- - org.codehaus.jackson.node.BaseJsonNode
  - - org.codehaus.jackson.node.MissingNode

All Implemented Interfaces:

Iterable<JsonNode>, JsonSerializable, JsonSerializableWithType
```
public final class MissingNode
extends BaseJsonNode
```
This singleton node class is generated to denote "missing nodes" along paths that do not exist. For example, if a path via element of an array is requested for an element outside range of elements in the array; or for a non-array value, result will be reference to this node.
In most respects this placeholder node will act as NullNode; for example, for purposes of value conversions, value is considered to be null and represented as value zero when used for numeric conversions.

Field Summary
- Fields inherited from class org.codehaus.jackson.JsonNode
  NO_NODES, NO_STRINGS

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`asBoolean(boolean defaultValue)` Method that will try to convert value of this node to a Java boolean.
`double`	`asDouble(double defaultValue)` Method that will try to convert value of this node to a Java double.
`int`	`asInt(int defaultValue)` Method that will try to convert value of this node to a Java int.
`long`	`asLong(long defaultValue)` Method that will try to convert value of this node to a Java long.
`String`	`asText()` Method that will return valid String representation of the container value, if the node is a value node (method `JsonNode.isValueNode()` returns true), otherwise empty String.
`JsonToken`	`asToken()` Method that can be used for efficient type detection when using stream abstraction for traversing nodes.
`boolean`	`equals(Object o)` Equality for node objects is defined as full (deep) value equality.
`static MissingNode`	`getInstance()`
`boolean`	`isMissingNode()` Method that returns true for "virtual" nodes which represent missing entries constructed by path accessor methods when there is no actual node matching given criteria.
`JsonNode`	`path(int index)` This method is similar to `JsonNode.get(int)`, except that instead of returning null if no such element exists (due to index being out of range, or this node not being an array), a "missing node" (node that returns true for `JsonNode.isMissingNode()`) will be returned.
`JsonNode`	`path(String fieldName)` This method is similar to `JsonNode.get(String)`, except that instead of returning null if no such value exists (due to this node not being an object, or object not having value for the specified field), a "missing node" (node that returns true for `JsonNode.isMissingNode()`) will be returned.
`void`	`serialize(JsonGenerator jg, SerializerProvider provider)` Method called to serialize node instances using given generator.
`void`	`serializeWithType(JsonGenerator jg, SerializerProvider provider, TypeSerializer typeSer)` Type information is needed, even if JsonNode instances are "plain" JSON, since they may be mixed with other types.
`String`	`toString()` Note: marked as abstract to ensure all implementation classes define it properly.

Methods inherited from class org.codehaus.jackson.node.BaseJsonNode
findParent, findParents, findPath, findValue, findValues, findValuesAsText, getNumberType, traverse

Methods inherited from class org.codehaus.jackson.JsonNode
asBoolean, asDouble, asInt, asLong, findParents, findValues, findValuesAsText, get, get, getBigIntegerValue, getBinaryValue, getBooleanValue, getDecimalValue, getDoubleValue, getElements, getFieldNames, getFields, getIntValue, getLongValue, getNumberValue, getPath, getPath, getTextValue, getValueAsBoolean, getValueAsBoolean, getValueAsDouble, getValueAsDouble, getValueAsInt, getValueAsInt, getValueAsLong, getValueAsLong, getValueAsText, has, has, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isNull, isNumber, isObject, isPojo, isTextual, isValueNode, iterator, size, with

Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - getInstance
```
public static MissingNode getInstance()
```
  - asToken
```
public JsonToken asToken()
```
    Description copied from class: BaseJsonNode
    
    Method that can be used for efficient type detection when using stream abstraction for traversing nodes. Will return the first JsonToken that equivalent stream event would produce (for most nodes there is just one token but for structured/container types multiple)
    
    Specified by:
    
    asToken in class BaseJsonNode
  - isMissingNode
```
public boolean isMissingNode()
```
    Description copied from class: JsonNode
    
    Method that returns true for "virtual" nodes which represent missing entries constructed by path accessor methods when there is no actual node matching given criteria.
    Note: one and only one of methods JsonNode.isValueNode(), JsonNode.isContainerNode() and JsonNode.isMissingNode() ever returns true for any given node.
    
    Overrides:
    
    isMissingNode in class JsonNode
  - asText
```
public String asText()
```
    Description copied from class: JsonNode
    
    Method that will return valid String representation of the container value, if the node is a value node (method JsonNode.isValueNode() returns true), otherwise empty String.
    
    Specified by:
    
    asText in class JsonNode
  - asBoolean
```
public boolean asBoolean(boolean defaultValue)
```
    Description copied from class: JsonNode
    
    Method that will try to convert value of this node to a Java boolean. JSON booleans map naturally; integer numbers other than 0 map to true, and 0 maps to false and Strings 'true' and 'false' map to corresponding values.
    If representation can not be converted to a boolean value (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
    
    Overrides:
    
    asBoolean in class JsonNode
  - asInt
```
public int asInt(int defaultValue)
```
    Description copied from class: JsonNode
    
    Method that will try to convert value of this node to a Java int. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.
    If representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
    
    Overrides:
    
    asInt in class JsonNode
  - asLong
```
public long asLong(long defaultValue)
```
    Description copied from class: JsonNode
    
    Method that will try to convert value of this node to a Java long. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.
    If representation can not be converted to an long (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
    
    Overrides:
    
    asLong in class JsonNode
  - asDouble
```
public double asDouble(double defaultValue)
```
    Description copied from class: JsonNode
    
    Method that will try to convert value of this node to a Java double. Numbers are coerced using default Java rules; booleans convert to 0.0 (false) and 1.0 (true), and Strings are parsed using default Java language integer parsing rules.
    If representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
    
    Overrides:
    
    asDouble in class JsonNode
  - path
```
public JsonNode path(String fieldName)
```
    Description copied from class: JsonNode
    
    This method is similar to JsonNode.get(String), except that instead of returning null if no such value exists (due to this node not being an object, or object not having value for the specified field), a "missing node" (node that returns true for JsonNode.isMissingNode()) will be returned. This allows for convenient and safe chained access via path calls.
    
    Specified by:
    
    path in class JsonNode
  - path
```
public JsonNode path(int index)
```
    Description copied from class: JsonNode
    
    This method is similar to JsonNode.get(int), except that instead of returning null if no such element exists (due to index being out of range, or this node not being an array), a "missing node" (node that returns true for JsonNode.isMissingNode()) will be returned. This allows for convenient and safe chained access via path calls.
    
    Specified by:
    
    path in class JsonNode
  - serialize
```
public final void serialize(JsonGenerator jg,
             SerializerProvider provider)
                     throws IOException,
                            JsonProcessingException
```
    Description copied from class: BaseJsonNode
    
    Method called to serialize node instances using given generator.
    
    Specified by:
    
    serialize in interface JsonSerializable
    
    Specified by:
    
    serialize in class BaseJsonNode
    
    Throws:
    
    IOException
    
    JsonProcessingException
  - serializeWithType
```
public void serializeWithType(JsonGenerator jg,
                     SerializerProvider provider,
                     TypeSerializer typeSer)
                       throws IOException,
                              JsonProcessingException
```
    Description copied from class: BaseJsonNode
    
    Type information is needed, even if JsonNode instances are "plain" JSON, since they may be mixed with other types.
    
    Specified by:
    
    serializeWithType in interface JsonSerializableWithType
    
    Specified by:
    
    serializeWithType in class BaseJsonNode
    
    Throws:
    
    IOException
    
    JsonProcessingException
  - equals
```
public boolean equals(Object o)
```
    Description copied from class: JsonNode
    
    Equality for node objects is defined as full (deep) value equality. This means that it is possible to compare complete JSON trees for equality by comparing equality of root nodes.
    Note: marked as abstract to ensure all implementation classes define it properly and not rely on definition from Object.
    
    Specified by:
    
    equals in class JsonNode
  - toString
```
public String toString()
```
    Description copied from class: JsonNode
    
    Note: marked as abstract to ensure all implementation classes define it properly.
    
    Specified by:
    
    toString in class JsonNode

Class MissingNode

Field Summary

Fields inherited from class org.codehaus.jackson.JsonNode

Method Summary

Methods inherited from class org.codehaus.jackson.node.BaseJsonNode

Methods inherited from class org.codehaus.jackson.JsonNode

Methods inherited from class java.lang.Object

Method Detail

getInstance

asToken

isMissingNode

asText

asBoolean

asInt

asLong

asDouble

path

path

serialize

serializeWithType

equals

toString