Concat.cs
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/******************************************************************************
* Copyright (C) Leap Motion, Inc. 2011-2017. *
* Leap Motion proprietary and confidential. *
* *
* Use subject to the terms of the Leap Motion SDK Agreement available at *
* https://developer.leapmotion.com/sdk_agreement, or another agreement *
* between Leap Motion and you, your company or other organization. *
******************************************************************************/
namespace Leap.Unity.Query {
public struct ConcatOp<SourceType, SourceOpA, SourceOpB> : IQueryOp<SourceType>
where SourceOpA : IQueryOp<SourceType>
where SourceOpB : IQueryOp<SourceType> {
private SourceOpA _sourceA;
private SourceOpB _sourceB;
private bool _isOnA;
public ConcatOp(SourceOpA enumeratorA, SourceOpB enumeratorB) {
_sourceA = enumeratorA;
_sourceB = enumeratorB;
_isOnA = true;
}
public bool TryGetNext(out SourceType t) {
if (_isOnA) {
if (_sourceA.TryGetNext(out t)) {
return true;
} else {
_isOnA = false;
}
}
return _sourceB.TryGetNext(out t);
}
public void Reset() {
_isOnA = true;
_sourceA.Reset();
_sourceB.Reset();
}
}
public partial struct QueryWrapper<QueryType, QueryOp> where QueryOp : IQueryOp<QueryType> {
/// <summary>
/// Returns a new query operation representing the concatenation of the current query sequence to
/// the argument query sequence.
///
/// For example
/// (A, B, C, D).Query().Concat((E, F, G, H))
/// would result in
/// (A, B, C, D, E, F, G, H)
/// </summary>
public QueryWrapper<QueryType, ConcatOp<QueryType, QueryOp, SourceBOp>> Concat<SourceBOp>(QueryWrapper<QueryType, SourceBOp> sourceB)
where SourceBOp : IQueryOp<QueryType> {
return new QueryWrapper<QueryType, ConcatOp<QueryType, QueryOp, SourceBOp>>(new ConcatOp<QueryType, QueryOp, SourceBOp>(_op, sourceB._op));
}
public QueryWrapper<QueryType, ConcatOp<QueryType, QueryOp, QueryConversionExtensions.ListQueryOp<QueryType>>> Concat(params QueryType[] sourceB) {
return new QueryWrapper<QueryType, ConcatOp<QueryType, QueryOp, QueryConversionExtensions.ListQueryOp<QueryType>>>(new ConcatOp<QueryType, QueryOp, QueryConversionExtensions.ListQueryOp<QueryType>>(_op, sourceB.Query()._op));
}
}
}