private Cube <UValue> collapse <UValue>(Dimension dimension, Func <Group <TValue>, UValue> aggregator)
{
IEnumerable <Dimension> dimensions = keyLookup.Keys.Where(otherDimension => dimension != otherDimension).ToArray();
Dictionary <Key, Group <TValue> > lookup = new Dictionary <Key, Group <TValue> >();
foreach (KeyValuePair <Key, TValue> pair in valueLookup)
{
KeyPart oldKeyPart = pair.Key.GetKeyPart(dimension);
IEnumerable <KeyPart> newKeyParts = dimensions.Select(item => pair.Key.GetKeyPart(item));
Key newKey = new Key(newKeyParts, true);
Group <TValue> group;
if (lookup.ContainsKey(newKey))
{
group = lookup[newKey];
}
else
{
group = new Group <TValue>(newKey);
lookup.Add(newKey, group);
}
group.AddPair(oldKeyPart, pair.Value);
}
LookupBuilder <UValue> builder = new LookupBuilder <UValue>(dimensions);
foreach (KeyValuePair <Key, Group <TValue> > pair in lookup)
{
UValue value = aggregator(pair.Value);
builder.Add(pair.Key, value);
}
return(new Cube <UValue>(builder));
}
/// <summary>
/// Creates a copy of the cube, excluding values whose keys have a matching key part value.
/// </summary>
/// <param name="keyPart">The dimension and key value of items to be removed.</param>
/// <returns>A new cube where the values matching the key part have been removed.</returns>
public Cube <TValue> Exclude(KeyPart keyPart)
{
if (keyPart == null)
{
throw new ArgumentNullException("keyPart");
}
if (!keyLookup.ContainsKey(keyPart.Dimension))
{
throw new ArgumentException("Cannot filter by a dimension that is not in the cube.", "dimension");
}
LookupBuilder <TValue> builder = new LookupBuilder <TValue>(keyLookup.Keys);
foreach (KeyValuePair <Key, TValue> pair in valueLookup)
{
if (!keyPart.Equals(pair.Key.GetKeyPart(keyPart.Dimension)))
{
builder.Add(pair.Key, pair.Value);
}
}
return(new Cube <TValue>(builder));
}
/// <summary>
/// Gets whether the given key is equal.
/// </summary>
/// <param name="other">The other key.</param>
/// <returns>True if obj is a Key and it represents the same key; otherwise, false.</returns>
public bool Equals(Key other)
{
if (other == null)
{
return(false);
}
foreach (KeyValuePair <Dimension, KeyPart> pair in keyParts)
{
Dimension dimension = pair.Key;
KeyPart keyPart = pair.Value;
if (!other.keyParts.ContainsKey(dimension))
{
return(false);
}
KeyPart otherKeyPart = other.keyParts[dimension];
if (!keyPart.Equals(otherKeyPart))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Creates a new cube where the key part value in the specified dimension equals the given key part's value.
/// </summary>
/// <param name="keyPart">The value the keys in the given dimension must equal.</param>
/// <returns>A new cube where the keys in the specified dimension equal the given value.</returns>
public Cube <TValue> Splice(KeyPart keyPart)
{
if (keyPart == null)
{
throw new ArgumentNullException("keyPart");
}
if (!keyLookup.ContainsKey(keyPart.Dimension))
{
throw new ArgumentException("Cannot splice a dimension that does not exist in the cube", "dimension");
}
Dictionary <KeyPart, List <Key> > dimensionLookup = keyLookup[keyPart.Dimension];
LookupBuilder <TValue> builder = new LookupBuilder <TValue>(keyLookup.Keys);
List <Key> keys;
if (dimensionLookup.TryGetValue(keyPart, out keys))
{
foreach (Key key in keys)
{
TValue value = valueLookup[key];
builder.Add(key, value);
}
}
return(new Cube <TValue>(builder));
}
/// <summary>
/// Creates a cube with a new dimension where all the values from the current cube are associated with the given key part value.
/// </summary>
/// <param name="keyPart">The dimension/key value pair to append to the cube.</param>
/// <returns>A new cube with the added dimension and values.</returns>
public Cube <TValue> AddDimension(KeyPart keyPart)
{
if (keyPart == null)
{
throw new ArgumentNullException("keyPart");
}
if (keyLookup.ContainsKey(keyPart.Dimension))
{
throw new ArgumentException("The given dimension already exists.", "dimension");
}
List <Dimension> dimensions = keyLookup.Keys.ToList();
dimensions.Add(keyPart.Dimension);
LookupBuilder <TValue> builder = new LookupBuilder <TValue>(dimensions);
foreach (KeyValuePair <Key, TValue> pair in valueLookup)
{
List <KeyPart> keyParts = new List <KeyPart>(pair.Key.GetKeyParts());
keyParts.Add(keyPart);
Key newKey = new Key(keyParts, true);
builder.Add(newKey, pair.Value);
}
return(new Cube <TValue>(builder));
}
