/// <summary>
/// Determines if the given Punctuation sheme benefits Group-by
/// </summary>
/// <param name="ps">The punctuation scheme to check</param>
/// <returns>If Benefits = true, else false</returns>
public override bool Benefit(PunctuationScheme ps)
{
if (attrs == null) return false;
List<int> NonWildcard = new List<int>();
//Extract all the non-wildcard patterns from the Punctuation Scheme
for (int i = 0; i < ps.Count; i++)
{
if (!(ps[i] is Punctuation.WildcardPattern))
NonWildcard.Add(i);
}
//Foreach non-wildcard pattern - see if it only affects grouped attributes
//Go through all the non-wildcard positions
foreach (int position in NonWildcard)
{
bool grouped = false;
//Go through all the attributes being grouped
foreach (int attr in attrs)
{
//If we found a match - we know that the non-wildcard pattern
//affects a grouped attribute.
if (attr == position)
grouped = true;
}
if (!grouped)
return false;
}
//If we made it through the matching process without returning,
//we know that this punctuation scheme contains wildcard patterns
//for all non-grouped attributes.
return true;
}
/// <summary>
/// Determines if the operator benefits from the punctuation scheme
/// </summary>
/// <param name="ps">The punctuation scheme to be tested</param>
public virtual bool Benefit(PunctuationScheme ps)
{
return true;
}
/// <summary>
/// Determines if the given Punctuation scheme benefits Project
/// </summary>
/// <param name="ps">The punctuation scheme to check</param>
/// <returns>If Benefits = true, else false</returns>
public override bool Benefit(PunctuationScheme ps)
{
if (attrsOrig == null) return false;
List<int> NonWildcard = new List<int>();
//Extract all the non-wildcard patterns from the Punctuation Scheme
for (int i = 0; i < ps.Count; i++)
{
if (!(ps[i] is Punctuation.WildcardPattern))
NonWildcard.Add(i);
}
//Foreach non-wildcard pattern - see if it is in the kept attributes
//Go through all the non-wildcard positions
foreach (int position in NonWildcard)
{
bool contains = false;
//Go through all the attributes being projected
foreach (int attr in attrsOrig)
{
//If we found a match - we know that we can punctuate on
//that attribute
if (attr == position)
contains = true;
}
if (!contains)
return false;
}
//If we made it through the matching process without returning,
//we know that we can pass this punctuation since we project all
//of the non-wildcard patterns.
return true;
}
