/// <summary>
/// Find an index that matches one of the filter parameters passed.
/// The parameter type and index type match up if the property name and
/// filter operator are the same for the index and the filter parameter.
/// For instance, for a filter parameter of "count EQUALS 10", the index against property "count" with
/// operator type EQUALS will be returned, if present.
/// NOTE: The caller is expected to obtain locks, if necessary, on the collections passed in.
/// NOTE: Doesn't match non-property based index - thus bool expressions don't get found and are always entered as a
/// new index
/// </summary>
/// <param name="parameters">is the list of sorted filter parameters</param>
/// <param name="indizes">is the collection of indexes</param>
/// <returns>
/// A matching pair of filter parameter and index, if any matches were found. Null if no matches were found.
/// </returns>
public static Pair<FilterValueSetParam, FilterParamIndexBase> FindIndex(
ICollection<FilterValueSetParam> parameters,
IList<FilterParamIndexBase> indizes)
{
foreach (FilterValueSetParam parameter in parameters)
{
FilterSpecLookupable lookupable = parameter.Lookupable;
FilterOperator @operator = parameter.FilterOperator;
foreach (FilterParamIndexBase index in indizes)
{
// if property-based index, we prefer this in matching
if (index is FilterParamIndexLookupableBase)
{
var propBasedIndex = (FilterParamIndexLookupableBase) index;
if ((lookupable.Equals(propBasedIndex.Lookupable)) &&
(@operator.Equals(propBasedIndex.FilterOperator)))
{
return new Pair<FilterValueSetParam, FilterParamIndexBase>(parameter, index);
}
}
else if (index is FilterParamIndexBooleanExpr && parameters.Count == 1)
{
// if bool-expression then match only if this is the last parameter,
// all others considered are higher order and sort ahead
if (@operator.Equals(FilterOperator.BOOLEAN_EXPRESSION))
{
return new Pair<FilterValueSetParam, FilterParamIndexBase>(parameter, index);
}
}
}
}
return null;
}
/// <summary>
/// Determine among the passed in filter parameters any parameter that matches the given index on property name and
/// filter operator type. Returns null if none of the parameters matches the index.
/// </summary>
/// <param name="parameters">is the filter parameter list</param>
/// <param name="index">is a filter parameter constant value index</param>
/// <returns>filter parameter, or null if no matching parameter found.</returns>
public static FilterValueSetParam FindParameter(
ICollection<FilterValueSetParam> parameters,
FilterParamIndexBase index)
{
if (index is FilterParamIndexLookupableBase)
{
var propBasedIndex = (FilterParamIndexLookupableBase) index;
FilterSpecLookupable indexLookupable = propBasedIndex.Lookupable;
FilterOperator indexOperator = propBasedIndex.FilterOperator;
foreach (FilterValueSetParam parameter in parameters)
{
FilterSpecLookupable lookupable = parameter.Lookupable;
FilterOperator paramOperator = parameter.FilterOperator;
if ((lookupable.Equals(indexLookupable)) &&
(paramOperator.Equals(indexOperator)))
{
return parameter;
}
}
}
else
{
foreach (FilterValueSetParam parameter in parameters)
{
FilterOperator paramOperator = parameter.FilterOperator;
if (paramOperator.Equals(index.FilterOperator))
{
return parameter;
}
}
}
return null;
}