Class JsonIndexAccessor

java.lang.Object

org.springframework.integration.json.JsonIndexAccessor

All Implemented Interfaces:

IndexAccessor, TargetedAccessor

public class JsonIndexAccessor
extends Object
implements IndexAccessor

A SpEL IndexAccessor that knows how to read indexes from JSON arrays, using Jackson's ArrayNode API.

Supports indexes supplied as an integer literal — for example, myJsonArray[1]. Also supports negative indexes — for example, myJsonArray[-1] which equates to myJsonArray[myJsonArray.length - 1]. Furthermore, null is returned for any index that is out of bounds (see ArrayNode.get(int) for details).

Since:

6.4

Author:

Sam Brannen

See Also:

• JsonPropertyAccessor

Constructor Summary

Constructors

Constructor	Description
JsonIndexAccessor()

Method Summary

Modifier and Type	Method	Description
boolean	canRead(EvaluationContext context, Object target, Object index)
boolean	canWrite(EvaluationContext context, Object target, Object index)
Class<?>[]	getSpecificTargetClasses()
TypedValue	read(EvaluationContext context, Object target, Object index)
void	write(EvaluationContext context, Object target, Object index, Object newValue)

Methods inherited from class java.lang.Object

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

Constructor Details

JsonIndexAccessor

public JsonIndexAccessor()

Method Details

getSpecificTargetClasses

public Class<?>[] getSpecificTargetClasses()

Specified by:

getSpecificTargetClasses in interface TargetedAccessor

canRead

public boolean canRead(EvaluationContext context,
 Object target,
 Object index)

Specified by:

canRead in interface IndexAccessor

read

public TypedValue read(EvaluationContext context,
 Object target,
 Object index)
                throws AccessException

Specified by:

read in interface IndexAccessor

Throws:

AccessException

canWrite

public boolean canWrite(EvaluationContext context,
 Object target,
 Object index)

Specified by:

canWrite in interface IndexAccessor

write

public void write(EvaluationContext context,
 Object target,
 Object index,
 @Nullable
 Object newValue)

Specified by:

write in interface IndexAccessor