public DataServiceInfo ReadWaterOneFlowServiceInfo(string portalPageId)
{
DataServiceInfo serviceInfo = null;
// Create the URL to the descriptive info about the registered item on the HydroPortal
string url = _baseUrl + "/rest/document?id={" + portalPageId + "}";
// Determine if this is registered using the FGDC standard or Dublin Core standard, or neither
string response = WebOperations.DownloadASCII(url);
int index = response.IndexOf("<ServiceType>CUAHSIService</ServiceType>");
if (index > -1)
{
// FGDC Standard
index = response.IndexOf("<metstdn>FGDC Content Standards for Digital Geospatial</metstdn>");
if (index > -1)
{
index = response.IndexOf("<WaterOneFlowURL>");
if (index > -1)
{
serviceInfo = ParseFgdcPage(url);
}
}
}
//else
//{
// index = response.IndexOf ( "<dc:contributor>The Dublin Core Metadata Initiative</dc:contributor>" );
// if ( index > -1 )
// {
// // Dublin Core Standard
// string detailsUrl = _baseUrl + "/catalog/search/viewMetadataDetails.page?uuid={" + portalPageId + "}";
// response = WebOperations.DownloadASCII ( detailsUrl );
// index = response.IndexOf ( "<td class=\"parameterLabel\">WaterOneFlow URL</td>" );
// if ( index > -1 )
// {
// serviceInfo = ParseDublinCorePage ( url );
// }
// }
//}
return(serviceInfo);
}
/// <summary>
/// Returns the base URL of the HydroPortal. This is required in order to properly construct REST queries on the portal.
/// </summary>
/// <param name="portalUrl">Original HydroPortal URL, e.g., https://hydroportal.crwr.utexas.edu/geoportal/catalog/main/home.page or https://hydroportal.crwr.utexas.edu/geoportal</param>
/// <returns>Base HydroPortal URL, e.g., https://hydroportal.crwr.utexas.edu/geoportal</returns>
private string GetBasePortalUrl(string portalUrl)
{
// Create a URI object from the given portal URL. This accounts for possible redirect.
Uri uri = WebOperations.GetUri(portalUrl, true);
string baseUrl = uri.ToString();
// Trim the home page fluff
int index = baseUrl.ToLower().IndexOf("geoportal/catalog");
if (index > -1)
{
baseUrl = portalUrl.Substring(0, index + 9);
}
// Trim current searches
index = baseUrl.IndexOf("geoportal/rest");
if (index > -1)
{
baseUrl = portalUrl.Substring(0, index + 9);
}
// Trim parameters
index = baseUrl.IndexOf("?");
if (index > -1)
{
baseUrl = portalUrl.Substring(0, index);
}
// Make sure this is still a valid URL
if (!WebOperations.IsUrlValid(baseUrl, false))
{
baseUrl = uri.ToString(); // Revert back to the URI that worked
}
// Remove trailing backslash
index = baseUrl.LastIndexOf("/");
if (index == (baseUrl.Length - 1))
{
baseUrl = baseUrl.Substring(0, baseUrl.Length - 1);
}
return(baseUrl);
}
/// <summary>
/// Parses a HydroPortal page for a WaterOneFlow service registered using the FGDC metadata standard.
/// </summary>
/// <param name="pageUrl">The URL to the HydroPortal page describing the service</param>
/// <returns>If the page describes a WaterOneFlow service, a DataServiceInfo object describing the service is returned</returns>
private DataServiceInfo ParseFgdcPage(string pageUrl)
{
DataServiceInfo serviceInfo = new DataServiceInfo();
try
{
using (XmlTextReader reader = new XmlTextReader(pageUrl))
{
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
// Abstract
if (reader.Name.ToLower() == "abstract")
{
reader.Read();
serviceInfo.Abstract = reader.Value;
}
// Citation
else if (reader.Name.ToLower() == "citation")
{
string origin = "(unknown author)";
string title = "(unknown title)";
string pubplace = "(unknown organization)";
string pubdate = "unknown date";
string link = "(unknown link)";
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name.ToLower() == "origin")
{
reader.Read();
if (reader.Value.Trim() != String.Empty)
{
origin = reader.Value;
}
}
else if (reader.Name.ToLower() == "title")
{
reader.Read();
if (reader.Value.Trim() != String.Empty)
{
title = reader.Value;
}
}
else if (reader.Name.ToLower() == "pubplace")
{
reader.Read();
if (reader.Value.Trim() != String.Empty)
{
pubplace = reader.Value;
}
}
else if (reader.Name.ToLower() == "pubdate")
{
reader.Read();
if (reader.Value.Trim() != String.Empty)
{
pubdate = reader.Value;
}
}
else if (reader.Name.ToLower() == "onlink")
{
reader.Read();
if (reader.Value.Trim() != String.Empty)
{
link = reader.Value;
}
}
}
else if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "citation")
{
break;
}
}
serviceInfo.Citation = origin + ". " + title + ". " + pubdate + ". " + pubplace + ". <" + link + ">.";
}
// Contact Name and Email
else if (reader.Name.ToLower() == "ptcontac")
{
string contactName = "";
string contactEmail = "";
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name.ToLower() == "cntper")
{
reader.Read();
contactName = reader.Value;
}
else if (reader.Name.ToLower() == "cntemail")
{
reader.Read();
contactEmail = reader.Value;
}
}
else if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "ptcontac")
{
break;
}
}
serviceInfo.ContactEmail = contactEmail;
serviceInfo.ContactName = contactName;
}
// Bounding Box
else if (reader.Name == "bounding")
{
double west = 0;
double east = 0;
double north = 0;
double south = 0;
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name.ToLower() == "westbc")
{
reader.Read();
double.TryParse(reader.Value, out west);
}
else if (reader.Name.ToLower() == "eastbc")
{
reader.Read();
double.TryParse(reader.Value, out east);
}
else if (reader.Name.ToLower() == "northbc")
{
reader.Read();
double.TryParse(reader.Value, out north);
}
else if (reader.Name.ToLower() == "southbc")
{
reader.Read();
double.TryParse(reader.Value, out south);
}
}
else if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "bounding")
{
break;
}
}
serviceInfo.EastLongitude = east;
serviceInfo.WestLongitude = west;
serviceInfo.NorthLatitude = north;
serviceInfo.SouthLatitude = south;
}
// Service Code
else if (reader.Name == "ServiceCode")
{
reader.Read();
serviceInfo.ServiceCode = reader.Value;
}
// Service Endpoint URL
else if (reader.Name == "WaterOneFlowURL")
{
reader.Read();
serviceInfo.EndpointURL = WebOperations.GetCanonicalUri(reader.Value, true);
}
// Service Description URL
else if (reader.Name == "MapServiceURL")
{
reader.Read();
serviceInfo.DescriptionURL = reader.Value;
}
// Service Title
else if (reader.Name == "ServiceName")
{
reader.Read();
serviceInfo.ServiceTitle = reader.Value;
}
}
}
}
}
catch (Exception ex)
{
throw new WebException("Could not read XML response from " + pageUrl + ".\n" + ex.Message);
}
return(serviceInfo);
}
/// <summary>
/// Parses a HydroPortal page for a WaterOneFlow service registered using the Dublin Core metadata standard.
/// </summary>
/// <param name="pageUrl">The URL to the HydroPortal page describing the service</param>
/// <returns>If the page describes a WaterOneFlow service, a DataServiceInfo object describing the service is returned</returns>
private DataServiceInfo ParseDublinCorePage(string pageUrl)
{
DataServiceInfo serviceInfo = new DataServiceInfo();
try
{
using (XmlTextReader reader = new XmlTextReader(pageUrl))
{
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
// Abstract
if (reader.Name.ToLower() == "dc:description")
{
reader.Read();
serviceInfo.Abstract = reader.Value;
}
// Bounding Box
else if (reader.Name == "ows:WGS84BoundingBox")
{
double west = 0;
double east = 0;
double north = 0;
double south = 0;
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name == "ows:LowerCorner")
{
reader.Read();
string[] lowerCorner = reader.Value.Split(' ');
if (lowerCorner.Length == 2)
{
double.TryParse(lowerCorner[0], out west);
double.TryParse(lowerCorner[1], out south);
}
}
else if (reader.Name == "ows:UpperCorner")
{
reader.Read();
string[] upperCorner = reader.Value.Split(' ');
if (upperCorner.Length == 2)
{
double.TryParse(upperCorner[0], out east);
double.TryParse(upperCorner[1], out north);
}
}
}
else if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "ows:WGS84BoundingBox")
{
break;
}
}
serviceInfo.EastLongitude = east;
serviceInfo.WestLongitude = west;
serviceInfo.NorthLatitude = north;
serviceInfo.SouthLatitude = south;
}
// Service Code
else if (reader.Name.ToLower() == "dc:title")
{
reader.Read();
serviceInfo.ServiceCode = reader.Value;
}
// Service Endpoint URL
else if (reader.Name.ToLower() == "dc:creator")
{
reader.Read();
serviceInfo.EndpointURL = WebOperations.GetCanonicalUri(reader.Value, true);
}
// Service Description URL
else if (reader.Name == "dct:references")
{
reader.Read();
serviceInfo.DescriptionURL = reader.Value;
}
// Service Title
else if (reader.Name.ToLower() == "dct:alternative")
{
reader.Read();
serviceInfo.ServiceTitle = reader.Value;
}
}
}
}
}
catch (Exception ex)
{
throw new WebException("Could not read XML response from " + pageUrl + ".\n" + ex.Message);
}
return(serviceInfo);
}
