ch.ralscha.extdirectspring.util

Class JsonHandler

java.lang.Object

ch.ralscha.extdirectspring.util.JsonHandler

public class JsonHandler
extends Object

Object contains an ObjectMapper and provides convenient methods.

Author:

Ralph Schaer

Constructor Summary

Constructors

Constructor and Description
JsonHandler()

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	convertValue(Object object, Class<T> clazz) Converts one object into another.
org.codehaus.jackson.map.ObjectMapper	getMapper()
Object	readValue(InputStream is, Class<Object> clazz) Converts a JSON string into an object.
<T> T	readValue(String json, Class<T> clazz) Converts a JSON string into an object.
<T> T	readValue(String json, org.codehaus.jackson.type.TypeReference<T> typeReference) Converts a JSON string into an object.
void	setMapper(org.codehaus.jackson.map.ObjectMapper mapper) Sets a new instance of ObjectMapper.
String	writeValueAsString(Object obj) Converts an object into a JSON string.
String	writeValueAsString(Object obj, boolean indent) Converts an object into a JSON string.

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonHandler

public JsonHandler()

Method Detail

setMapper

public void setMapper(org.codehaus.jackson.map.ObjectMapper mapper)

Sets a new instance of ObjectMapper.

Parameters:

mapper - a new object mapper. must not be null

getMapper

public org.codehaus.jackson.map.ObjectMapper getMapper()

Returns:

the currently assigned ObjectMapper

writeValueAsString

public String writeValueAsString(Object obj)

Converts an object into a JSON string. In case of an exception returns null and logs the exception.

Parameters:

obj - the source object

Returns:

obj JSON string, null if an exception occured

writeValueAsString

public String writeValueAsString(Object obj,
                        boolean indent)

Converts an object into a JSON string. In case of an exceptions returns null and logs the exception.

Parameters:

obj - the source object

indent - if true JSON is written in a human readable format, if false JSON is written on one line

Returns:

obj JSON string, null if an exception occured

readValue

public <T> T readValue(String json,
              org.codehaus.jackson.type.TypeReference<T> typeReference)

Converts a JSON string into an object. In case of an exception returns null and logs the exception.

Type Parameters:

T - type of the object to create

Parameters:

json - string with the JSON

typeReference - TypeReference instance of the desired result type TypeReference

Returns:

the created object, null if there was an exception

readValue

public <T> T readValue(String json,
              Class<T> clazz)

Converts a JSON string into an object. In case of an exception returns null and logs the exception.

Type Parameters:

T - type of the object to create

Parameters:

json - string with the JSON

clazz - class of object to create

Returns:

the converted object, null if there is an exception

readValue

public Object readValue(InputStream is,
               Class<Object> clazz)

Converts a JSON string into an object. The input is read from an InputStream. In case of an exception returns null and logs the exception.

Parameters:

is - a InputStream

clazz - class of object to create

Returns:

the converted object, null if there is an exception

convertValue

public <T> T convertValue(Object object,
                 Class<T> clazz)

Converts one object into another.

Parameters:

object - the source

clazz - the type of the target

Returns:

the converted object