org.klnusbaum.udj.EventsLoader.java Source code

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Here is the source code for org.klnusbaum.udj.EventsLoader.java

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/**
 * Copyright 2011 Kurtis L. Nusbaum
 * 
 * This file is part of UDJ.
 * 
 * UDJ 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 2 of the License, or
 * (at your option) any later version.
 * 
 * UDJ 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 UDJ.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.klnusbaum.udj;

import android.support.v4.content.AsyncTaskLoader;

import android.location.Location;
import android.util.Log;
import android.content.Context;
import android.accounts.OperationCanceledException;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.AuthenticatorException;

import java.io.IOException;
import java.io.FileOutputStream;
import java.util.List;

import org.apache.http.auth.AuthenticationException;

import org.json.JSONException;

import org.klnusbaum.udj.network.ServerConnection;
import org.klnusbaum.udj.containers.Event;

public class EventsLoader extends AsyncTaskLoader<EventsLoader.EventsLoaderResult> {
    public enum EventLoaderError {
        NO_ERROR, NO_CONNECTION, SERVER_ERROR, NO_LOCATION, AUTHENTICATION_ERROR, NO_ACCOUNT
    };

    public static class EventsLoaderResult {
        private List<Event> events;
        private EventLoaderError error;

        public EventsLoaderResult(List<Event> events, EventLoaderError error) {
            this.events = events;
            this.error = error;
        }

        public EventLoaderError getError() {
            return error;
        }

        public List<Event> getEvents() {
            return events;
        }
    }

    private static final String TAG = "EVETNS_LOADER";

    private AccountManager am;
    private Account account;
    private Location location;
    private String searchQuery;
    private List<Event> events;
    private boolean locationSearch;

    public EventsLoader(Context context, Account account, Location location) {
        super(context);
        am = AccountManager.get(context);
        this.account = account;
        this.location = location;
        this.events = null;
        this.searchQuery = null;
        locationSearch = true;
    }

    public EventsLoader(Context context, Account account, String query) {
        super(context);
        am = AccountManager.get(context);
        this.account = account;
        this.location = null;
        this.events = null;
        this.searchQuery = query;
        locationSearch = false;
    }

    @Override
    protected void onStartLoading() {
        if (takeContentChanged() || events == null) {
            forceLoad();
        }
    }

    public EventsLoaderResult loadInBackground() {
        if (account == null) {
            return new EventsLoaderResult(null, EventLoaderError.NO_ACCOUNT);
        } else if (location == null && locationSearch) {
            return new EventsLoaderResult(null, EventLoaderError.NO_LOCATION);
        } else if (!Utils.isNetworkAvailable(getContext())) {
            return new EventsLoaderResult(null, EventLoaderError.NO_CONNECTION);
        } else {
            return doSearch(true);
        }
    }

    private EventsLoaderResult doSearch(boolean attemptReauth) {
        String authToken = "";
        try {
            authToken = am.blockingGetAuthToken(account, "", true);
            if (locationSearch) {
                Log.d(TAG, "Doing location search");
                return doLocationSearch(authToken);
            } else {
                Log.d(TAG, "Doing name search");
                return doNameSearch(authToken);
            }
        } catch (IOException e) {
            Log.e(TAG, "IO exception");
        } catch (AuthenticatorException e) {
            Log.e(TAG, "Authenticator exception");
            //TODO notify the user
        } catch (OperationCanceledException e) {
            Log.e(TAG, "Operation cancelced exception");
            //TODO notify user
        } catch (JSONException e) {
            Log.e(TAG, "Json exception");
            Log.e(TAG, e.getMessage());
            //TODO notify the user
        } catch (AuthenticationException e) {
            if (attemptReauth) {
                Log.e(TAG, "Soft auth fail");
                am.invalidateAuthToken(Constants.ACCOUNT_TYPE, authToken);
                return doSearch(false);
            } else {
                //TODO notify user
                Log.e(TAG, "Hard auth fail");
            }
        }
        return new EventsLoaderResult(null, EventLoaderError.AUTHENTICATION_ERROR);
    }

    private EventsLoaderResult doLocationSearch(String authToken)
            throws AuthenticationException, JSONException, IOException {
        List<Event> events = ServerConnection.getNearbyEvents(location, authToken);
        return new EventsLoaderResult(events, EventLoaderError.NO_ERROR);
    }

    private EventsLoaderResult doNameSearch(String authToken)
            throws AuthenticationException, JSONException, IOException {
        List<Event> events = ServerConnection.searchForEvents(searchQuery, authToken);
        return new EventsLoaderResult(events, EventLoaderError.NO_ERROR);
    }
}