org.mixare.data.convert.GeoDataProcessorGeoJSON.java Source code

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Here is the source code for org.mixare.data.convert.GeoDataProcessorGeoJSON.java

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/*
 * Copyright (C) 2012- Peer internet solutions & Finalist IT Group
 * 
 * This file is part of mixare.
 * 
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version. 
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details. 
 * 
 * You should have received a copy of the GNU General Public License along with 
 * this program. If not, see <http://www.gnu.org/licenses/>
 */
package org.mixare.data.convert;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import org.mixare.marker.POIMarker;
import org.mixare.data.DataHandler;
import org.mixare.lib.HtmlUnescape;

import org.mixare.lib.marker.Marker;

import android.util.Log;

/**
 * Data processor for the geographical learning object. Converts the raw data to JSON and then to marker data.
 * @author Luca Geraci
 */
public class GeoDataProcessorGeoJSON extends DataHandler implements DataProcessor {

    public static final int MAX_JSON_OBJECTS = 1000;

    @Override
    public String[] getUrlMatch() {
        String[] str = new String[0];
        return str;
    }

    @Override
    public String[] getDataMatch() {
        String[] str = new String[0];
        return str;
    }

    @Override
    public boolean matchesRequiredType(String type) {
        return true; //this datasources has no required type, it will always match.
    }

    @Override
    public List<Marker> load(String rawData, int taskId, int colour) throws JSONException {
        String id = "";
        String title = "";
        String description = ""; //not used by Mixare
        String URL = "";
        String meaning = ""; //not used by Mixare
        JSONObject geometry = null;
        String type = ""; //not used by Mixare
        JSONArray coordinates = null;
        double lat = 0, lng = 0;

        List<Marker> markers = new ArrayList<Marker>();
        JSONObject root = convertToJSON(rawData);
        Log.v("root", root.toString());
        JSONArray dataArray = root.getJSONArray("features");
        int top = Math.min(MAX_JSON_OBJECTS, dataArray.length());

        Marker ma = null;

        for (int i = 0; i < top; i++) {
            JSONObject object = dataArray.getJSONObject(i);
            JSONObject properties = object.getJSONObject("properties");

            if (properties.has("obj_id")) {
                id = properties.getString("obj_id");
            }

            if (properties.has("title")) {
                title = properties.getString("title");
            }

            if (properties.has("description")) {
                description = properties.getString("description");
            }

            if (properties.has("URL")) {
                URL = properties.getString("URL");
            }

            if (properties.has("meaning")) {
                meaning = properties.getString("meaning");
            }

            geometry = object.getJSONObject("geometry");

            if (geometry.has("type")) {
                type = geometry.getString("type");
            }

            if (geometry.has("coordinates")) {
                coordinates = geometry.getJSONArray("coordinates");
            }

            if (type.equals("Point")) {

                lat = (Double) coordinates.get(0);
                lng = (Double) coordinates.get(1);

                ma = new POIMarker(id, HtmlUnescape.unescapeHTML(title), meaning, lat, lng, 0, // elevation to be implemented, 
                        URL, taskId, colour);

                markers.add(ma);
            }

            if (type.equals("MultiPoint")) {
                int length = coordinates.length();
                for (int j = 0; j < length; j++) {
                    JSONArray sub_coordinates = coordinates.getJSONArray(j);
                    lat = (Double) sub_coordinates.get(0);
                    lng = (Double) sub_coordinates.get(1);

                    ma = new POIMarker(id, HtmlUnescape.unescapeHTML(title), meaning, lat, lng, 0, // elevation to be implemented, 
                            URL, taskId, colour);

                    markers.add(ma);
                }
            }
        }

        return markers;
    }

    private JSONObject convertToJSON(String rawData) {
        try {
            Log.v("rawData", rawData.toString());
            return new JSONObject(rawData);
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }
}