GSON wenn das Json verschiedene Klassen enthält

[Fohnbit]

Hallo,

wie könnt ich ein Json mit GSON serialisieren, wenn ich das Format des Json nicht vorab weiß?

Ich erhalte eine Event Nachricht, wo verschiedene Zustände eines Systems dargestellt werden:
Array "evts" enthält 8 Nachrichten.
Beispiel:
evts[0] ist unterschiedlich im Aufbau als evts[4]
Identifizieren kann man es durch das "@self" Feld.
Wenn ich also "@self" zuerst lesen könnte, kann ich die nötige Klasse bestimmen, mit welcher serialisiert werden soll.

Aber wie?

{
  "evts": [
    {
      "id": "FFA34CA8F1EC43F190020BED3126D903.0",
      "time": "2016-02-02T19:25:42.245+01:00",
      "type": "CHANGED",
      "props": [
        "bypassed"
      ],
      "evt": {
        "@type": [
          "IN.dsbl.1",
          "IN.byp.1",
          "IN.walkT.1",
          "IN.dev.1",
          "IN.point.1"
        ],
        "@self": "/1.1.Point.1003.6",
        "opState": "OK",
        "enabled": true,
        "bypassed": true,
        "walktest": "NONE",
        "incs": [
         
        ],
        "active": true
      }
    },
    {
      "id": "C0CDA2D92CCB457DA281EE7F6A82FEF8.1",
      "time": "2016-02-02T19:25:42.271+01:00",
      "type": "CHANGED",
      "props": [
        "bypassed"
      ],
      "evt": {
        "@type": [
          "IN.dsbl.1",
          "IN.byp.1",
          "IN.walkT.1",
          "IN.dev.1",
          "IN.point.1"
        ],
        "@self": "/1.1.Point.1004.6",
        "opState": "OK",
        "enabled": true,
        "bypassed": true,
        "walktest": "NONE",
        "incs": [
         
        ],
        "active": true
      }
    },
    {
      "id": "D4974591791F4397B52AECE28C210CEC.2",
      "time": "2016-02-02T19:25:42.293+01:00",
      "type": "CHANGED",
      "props": [
        "readyToArm",
        "numberOfBypassedDevices"
      ],
      "evt": {
        "@type": [
          "IN.area.1"
        ],
        "@self": "/1.1.Area.2.3",
        "armed": false,
        "transitionalState": "",
        "oiiArmable": true,
        "readyToArm": true,
        "readyToDisarm": false,
        "numberOfBypassedDevices": 1,
        "walktest": "",
        "motionDetectorTestActive": false,
        "chimeModeActive": false,
        "incs": [
         
        ]
      }
    },
    {
      "id": "20243E70939C4C77AD06AFE73AE0FD42.3",
      "time": "2016-02-02T19:25:42.302+01:00",
      "type": "CHANGED",
      "props": [
        "readyToArm",
        "numberOfBypassedDevices"
      ],
      "evt": {
        "@type": [
          "IN.area.1"
        ],
        "@self": "/1.1.Area.2.4",
        "armed": false,
        "transitionalState": "",
        "oiiArmable": true,
        "readyToArm": true,
        "readyToDisarm": false,
        "numberOfBypassedDevices": 1,
        "walktest": "",
        "motionDetectorTestActive": false,
        "chimeModeActive": false,
        "incs": [
         
        ]
      }
    },
    {
      "id": "0F2F176E0A394B5AA0B24D3A826F94F7.4",
      "time": "2016-02-02T19:25:42.371+01:00",
      "type": "CHANGED",
      "props": [
        "transitionalState"
      ],
      "evt": {
        "@type": [
          "IN.area.1"
        ],
        "@self": "/1.1.Area.2.2",
        "armed": false,
        "transitionalState": "INEXITDELAY",
        "oiiArmable": true,
        "readyToArm": true,
        "readyToDisarm": false,
        "numberOfBypassedDevices": 0,
        "walktest": "",
        "motionDetectorTestActive": false,
        "chimeModeActive": false,
        "incs": [
         
        ]
      }
    },
    {
      "id": "C6E218F514984BF1BC7D9F833235E2CD.5",
      "time": "2016-02-02T19:25:42.376+01:00",
      "type": "CHANGED",
      "props": [
        "transitionalState"
      ],
      "evt": {
        "@type": [
          "IN.area.1"
        ],
        "@self": "/1.1.Area.2.3",
        "armed": false,
        "transitionalState": "INEXITDELAY",
        "oiiArmable": true,
        "readyToArm": true,
        "readyToDisarm": false,
        "numberOfBypassedDevices": 1,
        "walktest": "",
        "motionDetectorTestActive": false,
        "chimeModeActive": false,
        "incs": [
         
        ]
      }
    },
    {
      "id": "84B0EC7C90DF4B3083C7F1AC98F3AB19.6",
      "time": "2016-02-02T19:25:42.386+01:00",
      "type": "CHANGED",
      "props": [
        "transitionalState"
      ],
      "evt": {
        "@type": [
          "IN.area.1"
        ],
        "@self": "/1.1.Area.2.4",
        "armed": false,
        "transitionalState": "INEXITDELAY",
        "oiiArmable": true,
        "readyToArm": true,
        "readyToDisarm": false,
        "numberOfBypassedDevices": 1,
        "walktest": "",
        "motionDetectorTestActive": false,
        "chimeModeActive": false,
        "incs": [
         
        ]
      }
    },
    {
      "id": "FDAB07CE95674810BDA43E77E7DA48C2.7",
      "time": "2016-02-02T19:25:42.400+01:00",
      "type": "CHANGED",
      "props": [
        "on"
      ],
      "evt": {
        "@type": [
          "IN.dsbl.1",
          "IN.dev.1",
          "IN.output.1"
        ],
        "@self": "/1.1.Output.12001.10",
        "opState": "OK",
        "enabled": true,
        "incs": [
         
        ],
        "on": true
      }
    }
  ]
}

 

[Fohnbit]

Habs nun doch selber noch hinbekommen:

JsonParser jsonParser = new JsonParser();
        JsonArray evts = jsonParser.parse(content.replace("@", ""))
                .getAsJsonObject().get("evts").getAsJsonArray();

        int index = 0;
        for (JsonElement result : evts) {
            JsonObject evt = result.getAsJsonObject().get("evt")
                    .getAsJsonObject();

            // was hat sich geändert?
            Props props = gson.fromJson(result, Props.class);
            System.out.println(props.toString());

            // ID bekommen
            String self = evt.get("self").getAsString();
            System.out.println("self: " + self);

            // Device Meldung
            if (self.startsWith("/1.1.Point.")) {
                for (Point point : points.getList()) {
                    if (point.getSelf().equals(self)) {
                        points.updateList(gson.fromJson(evt, Point.class),
                                index);
                    }
                    index++;
                }
            }
            index = 0;

            // Area Meldung
            if (self.startsWith("/1.1.Area.")) {
                for (Area area : areas.getList()) {
                    if (area.getSelf().equals(self)) {
                        // Array Serialisieren??
                        areas.updateList(gson.fromJson(evt, Area.class), index);
                    }
                    index++;
                }
            }
        }

        for (Point point : points.getList()) {
            System.out.println(point.toString());
        }

        for (Area area : areas.getList()) {
            System.out.println(area.toString());
        }