org.jolokia.converter.json

Class CollectionExtractor

java.lang.Object

org.jolokia.converter.json.CollectionExtractor

All Implemented Interfaces:

Extractor

public class CollectionExtractor
extends Object
implements Extractor

Extractor used for arbitrary collections. They are simply converted into JSON arrays, although the order is arbitrary. Setting to a collection is not allowed. This extractor must be called after all more specialized extractors (like the MapExtractor or ArrayExtractor).

Since:

18.10.11

Author:

roland

Constructor Summary

Constructors

Constructor and Description
CollectionExtractor()

Method Summary

Modifier and Type	Method and Description
boolean	canSetValue() Whether this extractor is able to set a value.
Object	extractObject(ObjectToJsonConverter pConverter, Object pValue, Stack<String> pPathParts, boolean jsonify) Converts a collection to an JSON array.
Class	getType() Type for which this extractor can objects of this type
Object	setObjectValue(StringToObjectConverter pConverter, Object pInner, String pAttribute, Object pValue) Setting of an object value is not supported for the collection converter

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionExtractor

public CollectionExtractor()

Method Detail

getType

public Class getType()

Type for which this extractor can objects of this type

Specified by:

getType in interface Extractor

Returns:

type which can be handled

extractObject

public Object extractObject(ObjectToJsonConverter pConverter,
                            Object pValue,
                            Stack<String> pPathParts,
                            boolean jsonify)
                     throws AttributeNotFoundException

Converts a collection to an JSON array. No path access is supported here

Specified by:

extractObject in interface Extractor

Parameters:

pConverter - the global converter in order to be able do dispatch for serializing inner data types

pValue - the value to convert

pPathParts - extra arguments which contain e.g. a path. The path is ignored here.

jsonify - whether to convert to a JSON object/list or whether the plain object should be returned. The later is required for writing an inner value

Returns:

the extracted object

Throws:

AttributeNotFoundException - if the inner path does not exist.

setObjectValue

public Object setObjectValue(StringToObjectConverter pConverter,
                             Object pInner,
                             String pAttribute,
                             Object pValue)
                      throws IllegalAccessException,
                             InvocationTargetException

Setting of an object value is not supported for the collection converter

Specified by:

setObjectValue in interface Extractor

Parameters:

pConverter - the global converter in order to be able do dispatch for serializing inner data types

pInner - object on which to set the value

pAttribute - attribute of the object to set

pValue - the new value to set

Returns:

the old value

Throws:

IllegalAccessException - if the attribute to set to is not accessible

InvocationTargetException - reflection error

canSetValue

public boolean canSetValue()

Whether this extractor is able to set a value.

Specified by:

canSetValue in interface Extractor

Returns:

true if this extractor can set a value, false otherwise.