/// <summary>
/// Returns the metadata for a dataset
/// </summary>
/// <param name="Name">The name of the dataset</param>
/// <returns>The metadata requested</returns>
internal CatalogDatasetEntry GetEntry(string Name)
{
IMongoQuery qry = Query.EQ("Name", BsonValue.Create(Name));
BsonDocument result = m_Conn[GDB_ITEMS].FindOne(qry);
if (default(ResultPortionInfo) == result)
{
throw new COMException("No metadata for item: " + Name);
}
CatalogDatasetEntry retval = new CatalogDatasetEntry(this);
retval.Load(result);
return(retval);
}
/// <summary>
/// Internal dataset creator function. Creates all necessary metadata
/// </summary>
/// <param name="Name">Name of the dataset</param>
/// <param name="FieldSet">Fields associated with the dataset</param>
/// <param name="extent">The geographic extent of the dataset</param>
/// <returns>A newly created MongoDBDataset</returns>
public MongoDBDataset CreateDataset(string Name, IFields FieldSet, IEnvelope extent)
{
if (m_Connection.GetCollectionNames().Contains(Name))
{
throw new COMException("Dataset " + Name + " already exists");
}
m_Connection.CreateCollection(Name);
var bsonIdex = new IndexKeysDocument {
{ CommonConst.SHAPEFIELD, "2d" }
};
m_Connection[Name].EnsureIndex(bsonIdex);
CatalogDatasetEntry dsEntry = new CatalogDatasetEntry(this.m_CatalogDS);
dsEntry.Name = Name;
dsEntry.Extent = extent;
dsEntry.Fields = FieldSet;
dsEntry.Save();
return(new MongoDBDataset(dsEntry, m_Connection));
}
/// <summary>
/// Get's Metadata for all datasets stored in the database
/// </summary>
/// <returns>Enumerable of CatalogDatasetEntries</returns>
internal IEnumerable <CatalogDatasetEntry> GetAllEntries()
{
List <CatalogDatasetEntry> retVal = new List <CatalogDatasetEntry>();
var results = m_Conn[GDB_ITEMS].Find(Query.Null);
List <ObjectId> deleteThese = new List <ObjectId>();
foreach (var result in results)
{
try
{
CatalogDatasetEntry tmp = new CatalogDatasetEntry(this);
tmp.Load(result);
if (!(String.IsNullOrEmpty(tmp.Name) || (tmp.Fields == null) || (tmp.Extent == null)))
{
retVal.Add(tmp);
}
else
{
deleteThese.Add(result.GetElement(CommonConst.OID).Value.AsObjectId);
}
}
catch (Exception)
{ }
}
if (deleteThese.Count > 0)
{
BsonValue[] ids = new BsonValue[deleteThese.Count];
int i = 0;
foreach (var x in deleteThese)
{
ids[i++] = BsonValue.Create(x);
}
m_Conn[GDB_ITEMS].Remove(Query.In(CommonConst.OID, ids));
}
return(retVal);
}
/// <summary>
/// Opens a dataset given its name
/// </summary>
/// <param name="localName">the name of the dataset</param>
/// <returns>a new IPlugInDatasetHelper</returns>
public IPlugInDatasetHelper OpenDataset(string localName)
{
CatalogDatasetEntry entry = m_CatalogDS.GetEntry(localName);
return(new MongoDBDataset(entry, m_Connection));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="entry">metadata (i.e. extent and fields)</param>
/// <param name="conn">Database it is located in</param>
public MongoDBDataset(CatalogDatasetEntry entry, MongoDatabase conn)
{
m_Connection = conn;
m_Entry = entry;
}