Examples of org.mortbay.util.ajax.JSON

org.mortbay.util.ajax.JSON
JSON Parser and Generator.
This class provides some static methods to convert POJOs to and from JSON notation. The mapping from JSON to java is:
```
 object ==> Map array  ==> Object[] number ==> Double or Long string ==> String null   ==> null bool   ==> Boolean 
```
The java to JSON mapping is:
```
 String --> string Number --> number Map    --> object List   --> array Array  --> array null   --> null Boolean--> boolean Object --> string (dubious!) 
```
The interface {@link JSON.Convertible} may be implemented by classes that wish to externalize and initialize specific fields to and from JSON objects. Only directed acyclic graphs of objects are supported.

The interface {@link JSON.Generator} may be implemented by classes that know how to render themselves as JSON andthe {@link #toString(Object)} method will use {@link JSON.Generator#addJSON(StringBuffer)} to generate the JSON.The class {@link JSON.Literal} may be used to hold pre-gnerated JSON object.
The interface {@link Convertor} may be implemented to provide static convertors for objects that may be registered with {@link #registerConvertor(Class,org.mortbay.util.ajax.JSON.Convertor)}. These convertors are looked up by class, interface and super class by {@link #getConvertor(Class)}.
@author gregw

    String format = request.getParameter("format");
    Collection<MetricsContext> allContexts = 
      ContextFactory.getFactory().getAllContexts();
    if ("json".equals(format)) {
      // Uses Jetty's built-in JSON support to convert the map into JSON.
      out.print(new JSON().toJSON(makeMap(allContexts)));
    } else {
      printMap(out, makeMap(allContexts));
    }
    out.close();
  }

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      }
      if (mrc != null) {
        map.put("jobtracker_port", mrc.getJobTrackerPort());
      }
      FileWriter fw = new FileWriter(new File(writeDetails));
      fw.write(new JSON().toJSON(map));
      fw.close();
    }
  }

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            if (_jsonOut == null)
            {
                _jsonOut = (JSON)_httpClient.getAttribute(__JSON);
                if (_jsonOut==null)
                {
                    _jsonOut = new JSON();
                    _httpClient.setAttribute(__JSON,_jsonOut);
                }
            }


            if (_timer == null)

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        Object ext=_ext == null?get(Bayeux.EXT_FIELD):_ext;
        if (ext instanceof Map)
            return (Map<String,Object>)ext;
        if (ext instanceof JSON.Literal)
        {
            JSON json=_pool == null?JSON.getDefault():_pool.getMsgJSON();
            _ext=ext=json.fromJSON(ext.toString());
            super.put(Bayeux.EXT_FIELD,ext);
            return (Map<String,Object>)ext;
        }


        if (!create)

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    /* ------------------------------------------------------------ */
    public String getJSON()
    {
        if (_json == null)
        {
            JSON json=_pool == null?JSON.getDefault():_pool.getMsgJSON();
            StringBuffer buf=new StringBuffer(json.getStringBufferSize());
            synchronized(buf)
            {
                json.appendMap(buf,this);
                _json=buf.toString();
            }
        }
        return _json;
    }

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        Object ext = _ext==null?get(Bayeux.EXT_FIELD):_ext;
        if (ext instanceof Map)
            return (Map<String,Object>)ext;
        if (ext instanceof JSON.Literal)
        {
            JSON json=_pool==null?JSON.getDefault():_pool.getMsgJSON();
            _ext=ext=json.fromJSON(ext.toString());
            super.put(Bayeux.EXT_FIELD,ext);
            return (Map<String,Object>)ext;
        }


        if (!create)

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    /* ------------------------------------------------------------ */
    public String getJSON()
    {
        if (_json==null)
        {
            JSON json=_pool==null?JSON.getDefault():_pool.getMsgJSON();
            StringBuffer buf = new StringBuffer(json.getStringBufferSize());
            synchronized(buf)
            {
                json.appendMap(buf,this);
                _json=buf.toString();
            }
        }
        return _json;
    }

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    if ("json".equals(format)) {
      response.setContentType("application/json; charset=utf-8");
      PrintWriter out = response.getWriter();
      try {
        // Uses Jetty's built-in JSON support to convert the map into JSON.
        out.print(new JSON().toJSON(makeMap(allContexts)));
      } finally {
        out.close();
      }
    } else {
      PrintWriter out = response.getWriter();

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      if (dfs != null) {
        map.put("namenode_port", dfs.getNameNodePort());
      }


      FileWriter fw = new FileWriter(new File(writeDetails));
      fw.write(new JSON().toJSON(map));
      fw.close();
    }
  }

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      if (mr != null) {
        map.put("jobtracker_port", mr.getConfig().get("mapred.job.tracker")
            .split(":")[1]);
      }
      FileWriter fw = new FileWriter(new File(writeDetails));
      fw.write(new JSON().toJSON(map));
      fw.close();
    }
  }

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