edu.cmu.sv.trailscribe.utils.SyncItemSerializer.java Source code

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Here is the source code for edu.cmu.sv.trailscribe.utils.SyncItemSerializer.java

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/* 
 * Copyright (c) 2014, TrailScribe Team.
 * This content is released under the MIT License. See the file named LICENSE for details.
 */
package edu.cmu.sv.trailscribe.utils;

import java.lang.reflect.Type;
import java.util.ArrayList;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import edu.cmu.sv.trailscribe.model.data.Kml;
import edu.cmu.sv.trailscribe.model.data.Map;
import edu.cmu.sv.trailscribe.model.data.SyncItem;

public class SyncItemSerializer implements JsonSerializer<ArrayList<SyncItem>> {

    /**
     * Serializes an array of SyncItems in the way the TrailScribe server expects 
     * 
     * @param items Sync items already in the device, either maps or kmls
     * @return syncItems a String representing the serialized items, grouped by their types (maps, kmls) 
     */
    @Override
    public JsonElement serialize(ArrayList<SyncItem> items, Type type, JsonSerializationContext context) {
        JsonObject syncItems = new JsonObject();
        JsonObject mapsJo = new JsonObject();
        JsonObject kmlsJo = new JsonObject();

        for (SyncItem item : items) {
            if (item instanceof Map) {
                Map map = (Map) item;
                JsonObject mapJo = new JsonObject();
                mapJo.addProperty("id", map.getId());
                mapJo.addProperty("last_modified", map.getLastModified());
                mapsJo.add(String.valueOf(map.getId()), mapJo);
            } else if (item instanceof Kml) {
                JsonObject kmlJo = new JsonObject();
                Kml kml = (Kml) item;
                kmlJo.addProperty("id", kml.getId());
                kmlJo.addProperty("last_modified", kml.getLastModified());
                kmlsJo.add(String.valueOf(kml.getId()), kmlJo);
            }
        }
        syncItems.add("maps", mapsJo);
        syncItems.add("kmls", kmlsJo);
        return syncItems;
    }

}