/// <summary>
/// Returns the appropriate data access layer for this connection.
/// </summary>
public override IDaLayer CreateDataAccessLayer()
{
MemoryDaLayer layer;
lock (_daLayers)
{
if (_daLayers.ContainsKey(Uid))
{
layer = _daLayers[Uid];
}
else
{
layer = new MemoryDaLayer(this);
_daLayers[Uid] = layer;
}
}
return layer;
}
/// <summary>
/// This is an index that has a nested index (I.E. an index on two or more fields).
/// </summary>
/// <param name="layer">Data access layer in use.</param>
/// <param name="property">Property for this index.</param>
/// <param name="nextProperties">Properties for the child indexes. Must have at least one.</param>
/// <param name="objects">All objects that will be in this index and its children.</param>
public MultiPropertyMemoryIndex(MemoryDaLayer layer, string property,
List<string> nextProperties,
IEnumerable<MemoryObject> objects)
: base(layer, property)
{
_childProperty = nextProperties[0];
if (nextProperties.Count > 1)
{
_grandchildProperties = nextProperties.GetRange(1, nextProperties.Count - 1);
}
AddObjectsToSubIndexes(objects);
}
/// <summary>
/// An index on a single field, keeps groups of the memory objects in a dictionary
/// keyed by the values of the field.
/// </summary>
/// <param name="layer">The data access layer in use.</param>
/// <param name="property">The property to index on.</param>
/// <param name="objects">All the objects in this index.</param>
public SinglePropertyMemoryIndex(MemoryDaLayer layer, string property,
IEnumerable<MemoryObject> objects)
: base(layer, property)
{
_values = SplitObjectsByProperty(objects);
}
/// <summary>
/// Base class that handles some of the key comparison common across index types.
/// </summary>
/// <param name="layer">The data access layer in use.</param>
/// <param name="property">The property to index on.</param>
protected AbstractMemoryIndex(MemoryDaLayer layer, string property)
{
_daLayer = layer;
_property = property;
}