public static PersistedDataSourceStatus Combine(this PersistedDataSourceStatus left,
PersistedDataSourceStatus right)
{
if (left == right)
{
return(left);
}
switch (left)
{
// If the left source was unavailable then the right source trumps this. It can either be
// Unknown, Available, or Partial.
case PersistedDataSourceStatus.Unavailable:
return(right);
// Unknown trumps unavailable, and turns Available to partial
case PersistedDataSourceStatus.Unknown:
switch (right)
{
case PersistedDataSourceStatus.Unavailable:
return(left);
case PersistedDataSourceStatus.Available:
return(PersistedDataSourceStatus.Partial);
case PersistedDataSourceStatus.Partial:
return(right);
}
break; // Fall-through to logic fault exception.
// Available trumps Unavailable, and turns Unknown to partial.
case PersistedDataSourceStatus.Available:
switch (right)
{
case PersistedDataSourceStatus.Unavailable:
return(left);
case PersistedDataSourceStatus.Unknown:
return(PersistedDataSourceStatus.Partial);
case PersistedDataSourceStatus.Partial:
return(right);
}
break; // Fall-through to logic fault exception.
// Partial data is always partial, no matter what the right source is.
case PersistedDataSourceStatus.Partial:
return(left);
}
throw new InvalidOperationException("Somebody is bad at switch statements.");
}
public static PersistedDataSourceStatus Combine(this PersistedDataSourceStatus left,
PersistedDataSourceStatus right)
{
if (left == right)
{
return left;
}
switch (left)
{
// If the left source was unavailable then the right source trumps this. It can either be
// Unknown, Available, or Partial.
case PersistedDataSourceStatus.Unavailable:
return right;
// Unknown trumps unavailable, and turns Available to partial
case PersistedDataSourceStatus.Unknown:
switch (right)
{
case PersistedDataSourceStatus.Unavailable:
return left;
case PersistedDataSourceStatus.Available:
return PersistedDataSourceStatus.Partial;
case PersistedDataSourceStatus.Partial:
return right;
}
break; // Fall-through to logic fault exception.
// Available trumps Unavailable, and turns Unknown to partial.
case PersistedDataSourceStatus.Available:
switch (right)
{
case PersistedDataSourceStatus.Unavailable:
return left;
case PersistedDataSourceStatus.Unknown:
return PersistedDataSourceStatus.Partial;
case PersistedDataSourceStatus.Partial:
return right;
}
break; // Fall-through to logic fault exception.
// Partial data is always partial, no matter what the right source is.
case PersistedDataSourceStatus.Partial:
return left;
}
throw new InvalidOperationException("Somebody is bad at switch statements.");
}
public PersistedDataSource(string name, PersistedDataSourceStatus status)
{
this.Name = name;
this.Status = status;
}
public PersistedDataSource(string name, PersistedDataSourceStatus status)
{
this.Name = name;
this.Status = status;
}
