/* Copyright (c) 2006 Google Inc.
*
* 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.
*/
using System;
using System.Xml;
using System.Globalization;
using Google.GData.Client;
namespace Google.GData.Extensions.Location {
/// <summary>
/// helper to instantiate all factories defined in here and attach
/// them to a base object
/// </summary>
public class GeoRssExtensions
{
/// <summary>
/// helper to add all MediaRss extensions to a base object
/// </summary>
/// <param name="baseObject"></param>
public static void AddExtension(AtomBase baseObject)
{
baseObject.AddExtension(new GeoRssWhere());
}
}
/// <summary>
/// short table for constants related to mediaRss declarations
/// </summary>
public class GeoNametable
{
/// <summary>static string to specify the georss namespace
/// </summary>
/// <summary>static string to specify the GeoRSS namespace supported</summary>
public const string NSGeoRss = "http://www.georss.org/georss";
/// <summary>static string to specify the GeoRSS prefix used</summary>
public const string geoRssPrefix = "georss";
/// <summary>static string to specify the KML namespapce supported</summary>
public const string NSGeoKml = "http://www.opengis.net/gml";
/// <summary>static string to specify the KML prefix used</summary>
public const string geoKmlPrefix = "gml";
/// <summary>static string to specify the the where element</summary>
public const string GeoRssWhereElement = "where";
/// <summary>static string to specify the the point element</summary>
public const string GeoKmlPointElement = "Point";
/// <summary>static string to specify the the pos element</summary>
public const string GeoKmlPositionElement = "pos";
}
/// <summary>
/// GEORSS schema extension describing a location. You are only supposed to deal with that one,
/// not it's subelements.
/// </summary>
public class GeoRssWhere : SimpleContainer
{
/// <summary>
/// default constructor for a GeoRSS where element
/// </summary>
public GeoRssWhere() :
base(GeoNametable.GeoRssWhereElement,
GeoNametable.geoRssPrefix,
GeoNametable.NSGeoRss)
{
this.ExtensionFactories.Add(new GeoKmlPoint());
}
/// <summary>
/// Constructor for a GeoRSS where element with an
/// initial lat and long
/// </summary>
/// <param name="latitude">The latitude of the point</param>
/// <param name="longitude">The longitude of the point</param>
public GeoRssWhere(double latitude, double longitude) :
this()
{
this.Latitude = latitude;
this.Longitude = longitude;
}
/// <summary>
/// accessor for the Latitude part
/// </summary>
public double Latitude
{
get
{
GeoKmlPosition position = GetPosition(false);
if (position == null)
{
return -1;
}
return position.Latitude;
}
set
{
GeoKmlPosition position = GetPosition(true);
position.Latitude = value;
}
}
/// <summary>
/// accessor for the Longitude part
/// </summary>
public double Longitude
{
get
{
GeoKmlPosition position = GetPosition(false);
if (position == null)
{
return -1;
}
return position.Longitude;
}
set
{
GeoKmlPosition position = GetPosition(true);
position.Longitude = value;
}
}
/// <summary>
/// finds our position element, if we don't have one
/// creates a new one depending on the fCreate parameter
/// </summary>
/// <param name="create">creates the subelements on true</param>
/// <returns>GeoKmlPosition</returns>
protected GeoKmlPosition GetPosition(bool create)
{
GeoKmlPoint point = FindExtension(GeoNametable.GeoKmlPointElement,
GeoNametable.NSGeoKml) as GeoKmlPoint;
GeoKmlPosition position = null;
if (point == null && create)
{
point = new GeoKmlPoint();
this.ExtensionElements.Add(point);
}
if (point != null)
{
position = point.FindExtension(GeoNametable.GeoKmlPositionElement,
GeoNametable.NSGeoKml) as GeoKmlPosition;
if (position == null && create)
{
position = new GeoKmlPosition("0 0");
point.ExtensionElements.Add(position);
}
}
return position;
}
}
/// <summary>
/// KmlPoint. Specifies a particular location, by means of a gml position
/// element, appears as a child of a georss where element
/// </summary>
public class GeoKmlPoint : SimpleContainer
{
/// <summary>
/// default constructor ofr a Kml:point element
/// </summary>
public GeoKmlPoint() :
base(GeoNametable.GeoKmlPointElement,
GeoNametable.geoKmlPrefix,
GeoNametable.NSGeoKml)
{
this.ExtensionFactories.Add(new GeoKmlPosition());
}
}
/// <summary>
/// KmlPos Specifies a latitude/longitude, seperated by a space
/// appears as a child of a geokmlpoint element
/// </summary>
public class GeoKmlPosition : SimpleElement
{
/// <summary>
/// default constructor, creates a position element
/// </summary>
public GeoKmlPosition() :
base(GeoNametable.GeoKmlPositionElement,
GeoNametable.geoKmlPrefix,
GeoNametable.NSGeoKml)
{
}
/// <summary>
/// default constructor, takes an initial value
/// </summary>
/// <param name="initValue"></param>
public GeoKmlPosition(string initValue) :
base(GeoNametable.GeoKmlPositionElement,
GeoNametable.geoKmlPrefix,
GeoNametable.NSGeoKml, initValue)
{
}
/// <summary>
/// accessor for Latitude. Works by dynamically parsing
/// the string that is stored in Value. Will THROW if
/// that string is incorrectly formated
/// </summary>
public double Latitude
{
get
{
string []values = this.Value.Split(new char[] {' '});
return Convert.ToDouble(values[0], CultureInfo.InvariantCulture);
}
set
{
string []values = this.Value.Split(new char[] {' '});
this.Value = value.ToString(CultureInfo.InvariantCulture) + " " + values[1];
}
}
/// <summary>
/// accessor for Longitude. Works by dynamically parsing
/// the string that is stored in Value. Will THROW if
/// that string is incorrectly formated
/// </summary>
public double Longitude
{
get
{
string []values = this.Value.Split(new char[] {' '});
return Convert.ToDouble(values[1], CultureInfo.InvariantCulture);
}
set
{
string []values = this.Value.Split(new char[] {' '});
this.Value = values[0] + " " + value.ToString(CultureInfo.InvariantCulture);
}
}
}
}
