QuerySource.cs

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using Fauna.Types;
using System.Diagnostics.CodeAnalysis;
 
namespace Fauna.Linq;
 
public abstract class QuerySource : IQuerySource
{
    [AllowNull]
    internal DataContext Ctx { get; private protected set; }
    [AllowNull]
    internal Pipeline Pipeline { get; private protected set; }
 
    internal void SetContext(DataContext ctx)
    {
        Ctx = ctx;
    }
 
    internal void SetQuery<TElem>(Query query)
    {
        Pipeline = new Pipeline(PipelineMode.Query, query, typeof(TElem), false, null, null);
    }
}
 
public partial class QuerySource<T> : QuerySource, IQuerySource<T>
{
    internal QuerySource(DataContext ctx, Pipeline pl)
    {
        Ctx = ctx;
        Pipeline = pl;
    }
 
    // Collection/Index DSLs are allowed to set _expr and _ctx in their own
    // constructors, so they use this base one.
    internal QuerySource() { }
 
    public IAsyncEnumerable<Page<T>> PaginateAsync(QueryOptions? queryOptions = null, CancellationToken cancel = default)
    {
        var pe = Pipeline.GetExec(Ctx);
        return pe.PagedResult<T>(queryOptions, cancel);
    }
 
    public IAsyncEnumerable<T> ToAsyncEnumerable(CancellationToken cancel = default) =>
        PaginateAsync(cancel: cancel).FlattenAsync();
 
    public IEnumerable<T> ToEnumerable() => new QuerySourceEnumerable(this);
}