org.ka2ddo.yaac.util

Class Json

java.lang.Object

org.ka2ddo.yaac.util.Json

public class Json
extends java.lang.Object

This class is a limited-function decoder and encoder for JSON messages, sufficient to support the implementation used by gpsd.

Author:

Andrew Pavlin, KA2DDO

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Json.JsonHashMap A LinkedHashMap intended to hold JSON-structured data, with a Json.JsonHashMap.toString() method that produces JSON text.

Method Summary

Modifier and Type	Method and Description
static java.util.Map<java.lang.String,java.lang.Object>	decodeJSON(java.io.Reader din, PortConnector portConnector) Read a JSON object hierarchy from the specified text Reader.
static Json.JsonHashMap	decodeJSON(java.io.Reader din, PortConnector portConnector, int[] charCount, Json.JsonHashMap answer)
static void	encodeJSON(java.util.Map<java.lang.String,java.lang.Object> data, java.io.PrintWriter pw) Convert a JSON object hierarchy into a JavaScript-compatible string in JSON syntax.

Methods inherited from class java.lang.Object

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

Method Detail

decodeJSON

public static java.util.Map<java.lang.String,java.lang.Object> decodeJSON(java.io.Reader din,
                                                                          PortConnector portConnector)
                                                                   throws java.io.IOException

Read a JSON object hierarchy from the specified text Reader.

Parameters:

din - Reader to get the JSON hierarchy from

portConnector - PortConnector to inform of starting and ending reading a JSON object, or null if no one is to be informed

Returns:

a Map of JSON attribute names to attribute values (note that some values can be other maps representing sub-ordinate JSON objects)

Throws:

java.io.IOException - if the Reader cannot be read to the end of the JSON object

decodeJSON

public static Json.JsonHashMap decodeJSON(java.io.Reader din,
                                          PortConnector portConnector,
                                          int[] charCount,
                                          Json.JsonHashMap answer)
                                   throws java.io.IOException

Throws:

java.io.IOException

encodeJSON

public static void encodeJSON(java.util.Map<java.lang.String,java.lang.Object> data,
                              java.io.PrintWriter pw)

Convert a JSON object hierarchy into a JavaScript-compatible string in JSON syntax.

Parameters:

data - the top object in the JSON hierarchy, represented as a Map with attribute name keys and attribute values

pw - PrintWriter to write the generated string representation to