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1
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struct EnumerableJoin{T,TKey,TI,SO,SI,OKS<:Function,IKS<:Function,RS<:Function} <: Enumerable
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2
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23
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outer::SO
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3
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inner::SI
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4
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outerKeySelector::OKS
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5
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innerKeySelector::IKS
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6
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resultSelector::RS
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7
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end
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8
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9
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0
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Base.eltype(::Type{EnumerableJoin{T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}}) where {T,TKeyOuter,TI,SO,SI,OKS,IKS,RS} = T
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10
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11
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function join(outer::Enumerable, inner::Enumerable, f_outerKeySelector::Function, outerKeySelector::Expr, f_innerKeySelector::Function, innerKeySelector::Expr, f_resultSelector::Function, resultSelector::Expr)
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12
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23
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TO = eltype(outer)
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13
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TI = eltype(inner)
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14
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23
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TKeyOuter = Base._return_type(f_outerKeySelector, Tuple{TO,})
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15
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23
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TKeyInner = Base._return_type(f_innerKeySelector, Tuple{TI,})
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16
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17
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23
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if TKeyOuter!=TKeyInner
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18
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0
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error("The keys in the join clause have different types, $TKeyOuter and $TKeyInner.")
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19
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end
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20
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21
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SO = typeof(outer)
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22
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SI = typeof(inner)
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23
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24
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23
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T = Base._return_type(f_resultSelector, Tuple{TO,TI})
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25
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26
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23
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OKS = typeof(f_outerKeySelector)
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27
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23
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IKS = typeof(f_innerKeySelector)
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28
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23
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RS = typeof(f_resultSelector)
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29
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|
|
30
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23
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return EnumerableJoin{T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}(outer,inner,f_outerKeySelector,f_innerKeySelector,f_resultSelector)
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31
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end
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|
32
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33
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function Base.iterate(iter::EnumerableJoin{T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}) where {T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}
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34
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23
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results = Array{T}(undef, 0)
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35
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36
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18
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inner_dict = OrderedDict{TKeyOuter,Array{TI,1}}()
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37
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23
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for i in iter.inner
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38
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18
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key = iter.innerKeySelector(i)
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39
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23
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if !haskey(inner_dict, key)
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|
40
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23
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inner_dict[key] = Array{TI}(undef, 0)
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41
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|
end
|
|
42
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23
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push!(inner_dict[key], i)
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43
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end
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|
44
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|
|
45
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23
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for i in iter.outer
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46
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|
outerKey = iter.outerKeySelector(i)
|
|
47
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23
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if haskey(inner_dict,outerKey)
|
|
48
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23
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for j in inner_dict[outerKey]
|
|
49
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23
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push!(results, iter.resultSelector(i,j))
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50
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|
end
|
|
51
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|
end
|
|
52
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|
end
|
|
53
|
|
|
|
54
|
23
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if length(results)==0
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55
|
0
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return nothing
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|
56
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|
end
|
|
57
|
|
|
|
58
|
23
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return results[1], (results, 2)
|
|
59
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|
end
|
|
60
|
|
|
|
61
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|
function Base.iterate(iter::EnumerableJoin{T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}, state) where {T,TKeyOuter,TI,SO,SI,OKS,IKS,RS}
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62
|
10
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if state[2]>length(state[1])
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63
|
10
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return nothing
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|
64
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else
|
|
65
|
10
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return state[1][state[2]], (state[1], state[2]+1)
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|
66
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|
end
|
|
67
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|
end
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davidanthoff