public override bool Equals(object obj)
{
if (Object.ReferenceEquals(this, obj))
{
return(true);
}
DomainConstraint <T_Variable, T_Element> other = obj as DomainConstraint <T_Variable, T_Element>;
if (null == other)
{
return(false);
}
if (_hashCode != other._hashCode)
{
return(false);
}
return(_range.SetEquals(other._range) && _variable.Equals(other._variable));
}
internal override IEnumerable <LiteralVertexPair <DomainConstraint <T_Variable, T_Element> > > GetSuccessors(Vertex vertex)
{
InitializeInverseMap();
var domainVariable = _inverseMap[vertex.Variable];
// since vertex children are ordinally aligned with domain, handle domain as array
var domain = domainVariable.Domain.ToArray();
// foreach unique successor vertex, build up range
Dictionary <Vertex, Set <T_Element> > vertexToRange = new Dictionary <Vertex, Set <T_Element> >();
for (int i = 0; i < vertex.Children.Length; i++)
{
Vertex successorVertex = vertex.Children[i];
Set <T_Element> range;
if (!vertexToRange.TryGetValue(successorVertex, out range))
{
range = new Set <T_Element>(domainVariable.Domain.Comparer);
vertexToRange.Add(successorVertex, range);
}
range.Add(domain[i]);
}
foreach (var vertexRange in vertexToRange)
{
var successorVertex = vertexRange.Key;
var range = vertexRange.Value;
// construct a DomainConstraint including the given range
var constraint = new DomainConstraint <T_Variable, T_Element>(domainVariable, range.MakeReadOnly());
var literal = new Literal <DomainConstraint <T_Variable, T_Element> >(
new TermExpr <DomainConstraint <T_Variable, T_Element> >(constraint), true);
yield return(new LiteralVertexPair <DomainConstraint <T_Variable, T_Element> >(successorVertex, literal));
}
}