public void Load()
{
using (var context = new GraphEntities())
{
context.AdjacentNodes.RemoveRange(context.AdjacentNodes);
context.Nodes.RemoveRange(context.Nodes);
context.SaveChanges();
context.Nodes.AddRange(GetNodes());
context.SaveChanges();
}
}
/// <summary>
/// Method that extracts pages and links from WebGraph files
/// </summary>
/// <param name="grapheEntity">Determines whether it is about pages or links</param>
/// <param name="fileName"> the suggested file to extract data from</param>
public void ExtractDataFromWebGraph(GraphEntities grapheEntity, string fileName)
{
using (Stream reader = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
if (grapheEntity == GraphEntities.Pages)
{
var pagesSerializer = new XmlSerializer(typeof(List <Page>));
_pages = (List <Page>)pagesSerializer.Deserialize(reader);
}
else if (grapheEntity == GraphEntities.Links)
{
var pagesSerializer = new XmlSerializer(typeof(List <Link>));
_links = (List <Link>)pagesSerializer.Deserialize(reader);
}
}
}
/// <summary>
/// Writes Pages or Links lists into XML files, input: the file name of the created XML file
/// </summary>
/// <param name="grapheEntity">The suggested entity to persist can be Page or Link</param>
/// <param name="fileName">The full name of the generated XML file</param>
private void PersistGraphEntitiesToXml(GraphEntities grapheEntity, string fileName)
{
if (fileName != null)
{
using (TextWriter writer = new StreamWriter(fileName))
{
if (grapheEntity == GraphEntities.Pages)
{
var pagesSerializer = new XmlSerializer(typeof(List <Model.Page>));
pagesSerializer.Serialize(writer, _pages);
}
else if (grapheEntity == GraphEntities.Links)
{
var linksSerializer = new XmlSerializer(typeof(List <Link>));
linksSerializer.Serialize(writer, _links);
}
}
}
}
