com.fasterxml.jackson.core

Class JsonStreamContext

java.lang.Object

com.fasterxml.jackson.core.JsonStreamContext

Direct Known Subclasses:

JsonReadContext, JsonWriteContext, TokenFilterContext

public abstract class JsonStreamContext
extends Object

Shared base class for streaming processing contexts used during reading and writing of Json content using Streaming API. This context is also exposed to applications: context object can be used by applications to get an idea of relative position of the parser/generator within json content being processed. This allows for some contextual processing: for example, output within Array context can differ from that of Object context.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	_index Index of the currently processed entry.
protected int	_type
protected static int	TYPE_ARRAY
protected static int	TYPE_OBJECT
protected static int	TYPE_ROOT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JsonStreamContext()

Method Summary

Methods

Modifier and Type	Method and Description
int	getCurrentIndex()
abstract 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.
int	getEntryCount()
abstract JsonStreamContext	getParent() Accessor for finding parent context of this context; will return null for root context.
String	getTypeDesc() Method for accessing simple type description of current context; either ROOT (for root-level values), OBJECT (for field names and values of JSON Objects) or ARRAY (for values of JSON Arrays)
boolean	inArray() Method that returns true if this context is an Array context; that is, content is being read from or written to a Json Array.
boolean	inObject() Method that returns true if this context is an Object context; that is, content is being read from or written to a Json Object.
boolean	inRoot() Method that returns true if this context is a Root context; that is, content is being read from or written to without enclosing array or object structure.
void	setCurrentValue(Object v) Method to call to pass value to be returned via getCurrentValue(); typically called indirectly through JsonParser.setCurrentValue(java.lang.Object) or JsonGenerator.setCurrentValue(java.lang.Object)).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TYPE_ROOT

protected static final int TYPE_ROOT

See Also:

Constant Field Values

TYPE_ARRAY

protected static final int TYPE_ARRAY

See Also:

Constant Field Values

TYPE_OBJECT

protected static final int TYPE_OBJECT

See Also:

Constant Field Values

_type

protected int _type

_index

protected int _index

Index of the currently processed entry. Starts with -1 to signal that no entries have been started, and gets advanced each time a new entry is started, either by encountering an expected separator, or with new values if no separators are expected (the case for root context).

Constructor Detail

JsonStreamContext

protected JsonStreamContext()

Method Detail

getParent

public abstract JsonStreamContext getParent()

Accessor for finding parent context of this context; will return null for root context.

inArray

public final boolean inArray()

Method that returns true if this context is an Array context; that is, content is being read from or written to a Json Array.

inRoot

public final boolean inRoot()

Method that returns true if this context is a Root context; that is, content is being read from or written to without enclosing array or object structure.

inObject

public final boolean inObject()

Method that returns true if this context is an Object context; that is, content is being read from or written to a Json Object.

getTypeDesc

public final String getTypeDesc()

Method for accessing simple type description of current context; either ROOT (for root-level values), OBJECT (for field names and values of JSON Objects) or ARRAY (for values of JSON Arrays)

getEntryCount

public final int getEntryCount()

Returns:

Number of entries that are complete and started.

getCurrentIndex

public final int getCurrentIndex()

Returns:

Index of the currently processed entry, if any

getCurrentName

public abstract String getCurrentName()

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.

getCurrentValue

public 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.

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.

Returns:

Currently active value, if one has been assigned.

Since:

2.5

setCurrentValue

public void setCurrentValue(Object v)

Method to call to pass value to be returned via getCurrentValue(); typically called indirectly through JsonParser.setCurrentValue(java.lang.Object) or JsonGenerator.setCurrentValue(java.lang.Object)).

Since:

2.5