com.communote.server.api.util

Class JsonHelper

java.lang.Object

com.communote.server.api.util.JsonHelper

public class JsonHelper
extends Object

Helper class for working with JSON.

Author:

Communote GmbH - http://www.communote.com/

Method Summary

Modifier and Type	Method and Description
static org.codehaus.jackson.map.ObjectMapper	getSharedObjectMapper() Returns a pre-configured ObjectMapper which (and especially its JSON and node factories) can be reused.
static org.codehaus.jackson.JsonNode	readJsonTree(String jsonString) Deserialize a JSON string into a JSON tree.
static void	writeJsonTree(Writer writer, org.codehaus.jackson.JsonNode rootNode) Serialize a JSON tree.
static String	writeJsonTreeAsString(org.codehaus.jackson.JsonNode rootNode) Converts a JSON tree into a string and ignores exceptions.

Methods inherited from class java.lang.Object

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

Method Detail

getSharedObjectMapper

public static org.codehaus.jackson.map.ObjectMapper getSharedObjectMapper()

Returns a pre-configured ObjectMapper which (and especially its JSON and node factories) can be reused. Because the mapper is shared, it must not be configured by the caller.

Returns:

the shared, pre-configured ObjectMapper.

readJsonTree

public static org.codehaus.jackson.JsonNode readJsonTree(String jsonString)

Deserialize a JSON string into a JSON tree. If the string cannot be converted null will be returned.

Parameters:

jsonString - the string to parse

Returns:

the JSON tree or null

writeJsonTree

public static void writeJsonTree(Writer writer,
                                 org.codehaus.jackson.JsonNode rootNode)
                          throws IOException

Serialize a JSON tree.

Parameters:

writer - the writer to write to

rootNode - the root node of the JSON object structure

Throws:

IOException - in case of an exception while serializing the json object

writeJsonTreeAsString

public static String writeJsonTreeAsString(org.codehaus.jackson.JsonNode rootNode)

Converts a JSON tree into a string and ignores exceptions. In case of an exception the result will be the empty string.

Parameters:

rootNode - the root node of the tree, can be null to produce a null node

Returns:

the serialized JSON object