JsonReadContext (jackson-core 2.12.0-rc2)

java.lang.Object
- com.fasterxml.jackson.core.JsonStreamContext
- - com.fasterxml.jackson.core.json.JsonReadContext

```
public final class JsonReadContext
extends JsonStreamContext
```
Extension of JsonStreamContext, which implements core methods needed, and also exposes more complete API to parser implementation classes.

Field Summary

Fields
Modifier and Type	Field and Description
`protected JsonReadContext`	`_child`
`protected int`	`_columnNr`
`protected String`	`_currentName`
`protected Object`	`_currentValue`
`protected DupDetector`	`_dups`
`protected int`	`_lineNr`
`protected JsonReadContext`	`_parent` Parent context for this context; null for root context.

Fields inherited from class com.fasterxml.jackson.core.JsonStreamContext
_index, _type, TYPE_ARRAY, TYPE_OBJECT, TYPE_ROOT

Constructor Summary

Constructors
Constructor and Description
`JsonReadContext(JsonReadContext parent, DupDetector dups, int type, int lineNr, int colNr)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`JsonReadContext`	`clearAndGetParent()` Method that can be used to both clear the accumulated references (specifically value set with `setCurrentValue(Object)`) that should not be retained, and returns parent (as would `getParent()` do).
`JsonReadContext`	`createChildArrayContext(int lineNr, int colNr)`
`JsonReadContext`	`createChildObjectContext(int lineNr, int colNr)`
`static JsonReadContext`	`createRootContext(DupDetector dups)`
`static JsonReadContext`	`createRootContext(int lineNr, int colNr, DupDetector dups)`
`boolean`	`expectComma()`
`String`	`getCurrentName()` Method for accessing name associated with the current location.
`Object`	`getCurrentValue()` Method for accessing currently active value being used by data-binding (as the source of streaming data to write, or destination of data being read), at this level in hierarchy.
`DupDetector`	`getDupDetector()`
`JsonReadContext`	`getParent()` Accessor for finding parent context of this context; will return null for root context.
`JsonLocation`	`getStartLocation(Object srcRef)` Optional method that may be used to access starting location of this context: for example, in case of JSON `Object` context, offset at which `[` token was read or written.
`boolean`	`hasCurrentName()`
`void`	`reset(int type, int lineNr, int colNr)` Internal method to allow instance reuse: DO NOT USE unless you absolutely know what you are doing.
`void`	`setCurrentName(String name)`
`void`	`setCurrentValue(Object v)` Method to call to pass value to be returned via `JsonStreamContext.getCurrentValue()`; typically called indirectly through `JsonParser.setCurrentValue(java.lang.Object)` or `JsonGenerator.setCurrentValue(java.lang.Object)`).
`JsonReadContext`	`withDupDetector(DupDetector dups)`

Methods inherited from class com.fasterxml.jackson.core.JsonStreamContext
getCurrentIndex, getEntryCount, getTypeDesc, hasCurrentIndex, hasPathSegment, inArray, inObject, inRoot, pathAsPointer, pathAsPointer, toString, typeDesc

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

- Field Detail
  - _parent
```
protected final JsonReadContext _parent
```
    Parent context for this context; null for root context.
  - _dups
```
protected DupDetector _dups
```
  - _child
```
protected JsonReadContext _child
```
  - _currentName
```
protected String _currentName
```
  - _currentValue
```
protected Object _currentValue
```
    Since:
    
    2.5
  - _lineNr
```
protected int _lineNr
```
  - _columnNr
```
protected int _columnNr
```
- Constructor Detail
  - JsonReadContext
```
public JsonReadContext(JsonReadContext parent,
                       DupDetector dups,
                       int type,
                       int lineNr,
                       int colNr)
```
- Method Detail
  - reset
```
public void reset(int type,
                  int lineNr,
                  int colNr)
```
    Internal method to allow instance reuse: DO NOT USE unless you absolutely know what you are doing. Clears up state (including "current value"), changes type to one specified; resets current duplicate-detection state (if any). Parent link left as-is since it is final.
    NOTE: Public since 2.12.
  - withDupDetector
```
public JsonReadContext withDupDetector(DupDetector dups)
```
  - getCurrentValue
```
public Object getCurrentValue()
```
    Description copied from class: JsonStreamContext
    
    Method for accessing currently active value being used by data-binding (as the source of streaming data to write, or destination of data being read), at this level in hierarchy.
    Note that "current value" is NOT populated (or used) by Streaming parser or generator; it is only used by higher-level data-binding functionality. The reason it is included here is that it can be stored and accessed hierarchically, and gets passed through data-binding.
    
    Overrides:
    
    getCurrentValue in class JsonStreamContext
    
    Returns:
    
    Currently active value, if one has been assigned.
  - setCurrentValue
```
public void setCurrentValue(Object v)
```
    Description copied from class: JsonStreamContext
    
    Method to call to pass value to be returned via JsonStreamContext.getCurrentValue(); typically called indirectly through JsonParser.setCurrentValue(java.lang.Object) or JsonGenerator.setCurrentValue(java.lang.Object)).
    
    Overrides:
    
    setCurrentValue in class JsonStreamContext
  - createRootContext
```
public static JsonReadContext createRootContext(int lineNr,
                                                int colNr,
                                                DupDetector dups)
```
  - createRootContext
```
public static JsonReadContext createRootContext(DupDetector dups)
```
  - createChildArrayContext
```
public JsonReadContext createChildArrayContext(int lineNr,
                                               int colNr)
```
  - createChildObjectContext
```
public JsonReadContext createChildObjectContext(int lineNr,
                                                int colNr)
```
  - getCurrentName
```
public String getCurrentName()
```
    Description copied from class: JsonStreamContext
    
    Method for accessing name associated with the current location. Non-null for FIELD_NAME and value events that directly follow field names; null for root level and array values.
    
    Specified by:
    
    getCurrentName in class JsonStreamContext
  - hasCurrentName
```
public boolean hasCurrentName()
```
    Overrides:
    
    hasCurrentName in class JsonStreamContext
  - getParent
```
public JsonReadContext getParent()
```
    Description copied from class: JsonStreamContext
    
    Accessor for finding parent context of this context; will return null for root context.
    
    Specified by:
    
    getParent in class JsonStreamContext
  - getStartLocation
```
public JsonLocation getStartLocation(Object srcRef)
```
    Description copied from class: JsonStreamContext
    
    Optional method that may be used to access starting location of this context: for example, in case of JSON `Object` context, offset at which `[` token was read or written. Often used for error reporting purposes. Implementations that do not keep track of such location are expected to return JsonLocation.NA; this is what the default implementation does.
    
    Overrides:
    
    getStartLocation in class JsonStreamContext
    
    Returns:
    
    Location pointing to the point where the context start marker was found (or written); never `null`.
    NOTE: demoted from JsonReadContext in 2.9, to allow use for "non-standard" read contexts.
  - clearAndGetParent
```
public JsonReadContext clearAndGetParent()
```
    Method that can be used to both clear the accumulated references (specifically value set with setCurrentValue(Object)) that should not be retained, and returns parent (as would getParent() do). Typically called when closing the active context when encountering JsonToken.END_ARRAY or JsonToken.END_OBJECT.
    
    Since:
    
    2.7
  - getDupDetector
```
public DupDetector getDupDetector()
```
  - expectComma
```
public boolean expectComma()
```
  - setCurrentName
```
public void setCurrentName(String name)
                    throws JsonProcessingException
```
    Throws:
    
    JsonProcessingException

Class JsonReadContext

Field Summary

Fields inherited from class com.fasterxml.jackson.core.JsonStreamContext

Constructor Summary

Method Summary

Methods inherited from class com.fasterxml.jackson.core.JsonStreamContext

Methods inherited from class java.lang.Object

Field Detail

_parent

_dups

_child

_currentName

_currentValue

_lineNr

_columnNr

Constructor Detail

JsonReadContext

Method Detail

reset

withDupDetector

getCurrentValue

setCurrentValue

createRootContext

createRootContext

createChildArrayContext

createChildObjectContext

getCurrentName

hasCurrentName

getParent

getStartLocation

clearAndGetParent

getDupDetector

expectComma

setCurrentName