And or pipes

In order to connect multiple pipes using Boolean logic there are two FilterPipe pipes called AndFilterPipe<S> and OrFilterPipe<S>. These pipes take an object of type S and emit an object of type S. However, they only emit the S object if the collection of IPipe<S, Boolean> pipes that they wrap return true. For AndFilterPipe to emit its incoming S object, all of its wrapped pipes must return true that S object. For the OrFilterPipe, only one of its wrapped pipes must return true.

If you want to see if a number is greater than or equal to 1 and less than 10, then use the following AndFilterPipe.

var _PipeA   = new ObjectFilterPipe<Int32>(1, ComparisonFilter.GREATER_THAN_EQUAL);
var _PipeB   = new ObjectFilterPipe<Int32>(10, ComparisonFilter.LESS_THAN);
var _ANDPipe = new AndFilterPipe<Int32>(new HasNextPipe<Int32>(_PipeA), new HasNextPipe<Int32>(_PipeB));
_ANDPipe.SetSourceCollection(new List<Int32>() {1, 22, 10, 136, 7, 2, 67 });

while(_ANDPipe.MoveNext())
{
    Console.WriteLine(_ANDPipe.Current + "...");
}

The console output of the previous code is as follows:

1...7...2...

Note the use of HasNextPipe<S> which implements IPipe<S, Boolean>. If the ObjectFilterPipe pipes that compose the AndFilterPipe filter their incoming S object, then they will return false on a call to MoveNext(). Thus, HasNextPipe is useful for determining if a filter pipe has filtered an object.

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