com.dmsl.anyplace.tasks.FetchBuildingsTask.java Source code

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Here is the source code for com.dmsl.anyplace.tasks.FetchBuildingsTask.java

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/*
* AnyPlace: A free and open Indoor Navigation Service with superb accuracy!
*
* Anyplace is a first-of-a-kind indoor information service offering GPS-less
* localization, navigation and search inside buildings using ordinary smartphones.
* 
* Author(s): Timotheos Constambeys
* 
* Supervisor: Demetrios Zeinalipour-Yazti
*
* URL: http://anyplace.cs.ucy.ac.cy
* Contact: anyplace@cs.ucy.ac.cy
*
* Copyright (c) 2015, Data Management Systems Lab (DMSL), University of Cyprus.
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in the
* Software without restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/

package com.dmsl.anyplace.tasks;

import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.http.conn.ConnectTimeoutException;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;

import com.dmsl.anyplace.AnyplaceAPI;
import com.dmsl.anyplace.nav.BuildingModel;
import com.dmsl.anyplace.utils.NetworkUtils;

public class FetchBuildingsTask extends AsyncTask<Void, Void, String> {

    public interface FetchBuildingsTaskListener {
        void onErrorOrCancel(String result);

        void onSuccess(String result, List<BuildingModel> buildings);
    }

    private FetchBuildingsTaskListener mListener;
    private Context ctx;

    private List<BuildingModel> buildings = new ArrayList<BuildingModel>();
    private boolean success = false;
    private ProgressDialog dialog;
    private Boolean showDialog = true;

    public FetchBuildingsTask(FetchBuildingsTaskListener fetchBuildingsTaskListener, Context ctx) {
        this.mListener = fetchBuildingsTaskListener;
        this.ctx = ctx;
    }

    public FetchBuildingsTask(FetchBuildingsTaskListener fetchBuildingsTaskListener, Context ctx,
            Boolean showDialog) {
        this.mListener = fetchBuildingsTaskListener;
        this.ctx = ctx;
        this.showDialog = showDialog;
    }

    @Override
    protected void onPreExecute() {
        if (showDialog) {
            dialog = new ProgressDialog(ctx);
            dialog.setIndeterminate(true);
            dialog.setTitle("Fetching Buildings");
            dialog.setMessage("Please be patient...");
            dialog.setCancelable(true);
            dialog.setCanceledOnTouchOutside(false);
            dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    FetchBuildingsTask.this.cancel(true);
                }
            });
            dialog.show();
        }

    }

    @Override
    protected String doInBackground(Void... params) {

        if (!NetworkUtils.isOnline(ctx)) {
            return "No connection available!";
        }

        try {

            JSONObject j = new JSONObject();
            try {
                j.put("username", "username");
                j.put("password", "pass");

            } catch (JSONException e) {
                return "Error requesting the buildings around you!";
            }

            String response = null;

            response = NetworkUtils.downloadHttpClientJsonPostGzip(AnyplaceAPI.getFetchBuildingsUrl(),
                    j.toString());

            JSONObject json = new JSONObject(response);

            // Missing in Zip Format
            if (json.has("status") && json.getString("status").equalsIgnoreCase("error")) {
                return "Error Message: " + json.getString("message");
            }

            // process the buildings received
            BuildingModel b;
            JSONArray buids_json = new JSONArray(json.getString("buildings"));
            for (int i = 0, sz = buids_json.length(); i < sz; i++) {
                JSONObject cp = (JSONObject) buids_json.get(i);
                b = new BuildingModel();
                b.setPosition(cp.getString("coordinates_lat"), cp.getString("coordinates_lon"));
                b.buid = cp.getString("buid");
                // b.address = cp.getString("address");
                // b.description = cp.getString("description");
                b.name = cp.getString("name");
                // b.url = cp.getString("url");

                buildings.add(b); // the anyplace Cache list
            }

            Collections.sort(buildings);

            success = true;
            return "Successfully fetched buildings";

        } catch (ConnectTimeoutException e) {
            return "Cannot connect to Anyplace service!";
        } catch (SocketTimeoutException e) {
            return "Communication with the server is taking too long!";
        } catch (UnknownHostException e) {
            return "No connection available!";
        } catch (Exception e) {
            return "Error fetching buildings. [ " + e.getMessage() + " ]";
        }
    }

    @Override
    protected void onPostExecute(String result) {
        if (showDialog)
            dialog.dismiss();

        if (success) {
            mListener.onSuccess(result, buildings);
        } else {
            // there was an error during the process
            mListener.onErrorOrCancel(result);
        }

    }

    @Override
    protected void onCancelled(String result) {
        if (showDialog)
            dialog.dismiss();
        mListener.onErrorOrCancel("Buildings Fetch cancelled...");
    }

    @Override
    protected void onCancelled() { // just for < API 11
        if (showDialog)
            dialog.dismiss();
        mListener.onErrorOrCancel("Buildings Fetch cancelled...");
    }

}