org.onebusaway.webapp.gwt.mobile_application.control.LocationManager.java Source code

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Here is the source code for org.onebusaway.webapp.gwt.mobile_application.control.LocationManager.java

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/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * 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 org.onebusaway.webapp.gwt.mobile_application.control;

import org.onebusaway.webapp.gwt.geo_location_library.GeoLocationErrorEvent;
import org.onebusaway.webapp.gwt.geo_location_library.GeoLocationEvent;
import org.onebusaway.webapp.gwt.geo_location_library.GeoLocationHandler;
import org.onebusaway.webapp.gwt.geo_location_library.GeoLocationLibrary;

import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.maps.client.geom.LatLng;
import com.google.gwt.user.client.Timer;

public class LocationManager {

    private GeoLocationHandlerImpl _geoLocation = new GeoLocationHandlerImpl();

    private LatLng _lastSearchLocation = null;

    private LatLng _physicalLocation = null;

    private boolean _usePhysicalLocation = true;

    private HandlerManager _handlerManager = null;

    public LocationManager() {
        _geoLocation.run();
        _geoLocation.schedule(30 * 1000);
    }

    public LatLng getCurrentSearchLocation() {
        if (_usePhysicalLocation && _physicalLocation != null)
            return _physicalLocation;
        if (_lastSearchLocation != null)
            return _lastSearchLocation;
        return LatLng.newInstance(47.601533, -122.32933);
    }

    public LatLng getLastSearchLocation() {
        return _lastSearchLocation;
    }

    public void setLastSearchLocation(LatLng searchLocation) {
        _lastSearchLocation = searchLocation;
        _usePhysicalLocation = false;
    }

    public boolean hasPhysicalLocation() {
        return _physicalLocation != null;
    }

    public LatLng getPhysicalLocation() {
        return _physicalLocation;
    }

    public void setUsePhysicalLocation(boolean usePhysicalLocation) {
        _usePhysicalLocation = usePhysicalLocation;
    }

    public void addGeoLocationHandler(GeoLocationHandler handler) {
        handlers().addHandler(GeoLocationEvent.TYPE, handler);
    }

    private HandlerManager handlers() {
        return _handlerManager == null ? _handlerManager = new HandlerManager("") : _handlerManager;
    }

    private class GeoLocationHandlerImpl extends Timer implements GeoLocationHandler {

        @Override
        public void run() {
            if (!GeoLocationLibrary.isSupported())
                System.out.println("geo location not supported...");
            else
                GeoLocationLibrary.queryLocation(this);
        }

        @Override
        public void handleLocation(GeoLocationEvent event) {
            _physicalLocation = LatLng.newInstance(event.getLat(), event.getLon());
            handlers().fireEvent(event);
        }

        @Override
        public void handleError(GeoLocationErrorEvent event) {
            System.err.println("error: code=" + event.getCode() + " message=" + event.getMessage());
        }
    }
}