com.rackspacecloud.client.service_registry.objects.Event.java Source code

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Here is the source code for com.rackspacecloud.client.service_registry.objects.Event.java

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/**
 *  Copyright 2012 Rackspace
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package com.rackspacecloud.client.service_registry.objects;

import com.google.gson.*;

import java.lang.reflect.Type;

public class Event implements InstanceCreator<Event>, JsonDeserializer<Event>, HasId {
    private String id;
    private Long timestamp;
    private EventType type;
    private EventPayload payload;

    public Event() {
    }

    public Event(String id, Long timestamp, EventType type, EventPayload payload) {
        this.id = id;
        this.timestamp = timestamp;
        this.type = type;
        this.payload = payload;
    }

    public String getId() {
        return id;
    }

    public Long getTimestamp() {
        return timestamp;
    }

    public EventType getType() {
        return type;
    }

    public EventPayload getPayload() {
        return payload;
    }

    @Override
    public Event createInstance(Type type) {
        return this;
    }

    @Override
    public Event deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
        JsonObject jsonObject = json.getAsJsonObject();

        String id = jsonObject.get("id").getAsString();
        EventType eventType = EventType.fromString(jsonObject.get("type").getAsString());
        if (eventType == null) {
            throw new Error("Unrecognized event type: " + jsonObject.get("type").getAsString());
        }

        JsonObject payloadJsonObject = jsonObject.get("payload").getAsJsonObject();
        Long timestamp = jsonObject.get("timestamp").getAsLong();
        EventPayload payload = null;

        switch (eventType) {
        case CONFIGURATION_VALUE_REMOVED:
        case CONFIGURATION_VALUE_UPATED:
            String configurationId = payloadJsonObject.get("configuration_value_id").getAsString();
            String oldValue, newValue;

            if (payloadJsonObject.get("old_value").isJsonNull()) {
                oldValue = null;
            } else {
                oldValue = payloadJsonObject.get("old_value").getAsString();
            }

            if (payloadJsonObject.has("new_value")) {
                newValue = payloadJsonObject.get("new_value").getAsString();

                payload = new ConfigurationValueUpdatedEventPayload(configurationId, oldValue, newValue);
            } else {
                payload = new ConfigurationValueRemovedEventPayload(configurationId, oldValue);
            }
            break;
        case SERVICE_JOINED:
            payload = new ServiceJoinEventPayload((Service) new Gson().fromJson(jsonObject, Service.TYPE));
            break;
        case SERVICE_REMOVED:
            payload = new ServiceRemoveEventPayload((Service) new Gson().fromJson(jsonObject, Service.TYPE));
            break;
        case SERVICE_TIMEOUT:
            payload = new ServiceTimeoutEventPayload((Service) new Gson().fromJson(jsonObject, Service.TYPE));
            break;
        default:
            throw new Error("Unrecognized event type: " + jsonObject.get("type").getAsString());
        }

        return new Event(id, timestamp, eventType, payload);
    }

    @Override
    public String toString() {
        return String.format("[Event id=%s, type=%s, timestamp=%s]", this.getId(), this.getType(),
                this.getTimestamp());
    }
}