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WIP: Add a function to update edge weights of a certain vertex #40

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WIP: Add a function to update edge weights of a certain vertex #40

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28 changes: 27 additions & 1 deletion src/traversal.jl
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
export foralledges
export foralledges, foralledgesupdatewts

"""
foralledges(f::Function, s::Stinger, v::Int64)
Expand All @@ -19,3 +19,29 @@ function foralledges(f::Function, s::Stinger, v::Int64)
current_eb_ptr = ebpool_priv_ptr + current_eb.next * (sizeof(StingerEdgeBlock) + sizeof(StingerEdge)*NUMEDGEBLOCKS);
end
end

"""
foralledgesupdatewts(s::Stinger, v::Int64, wts::Dict{Int64, Int64})

Iterates over all the edges edges of a vertex and increments the weights of the
edges if the neighbor is found in the `wts` dictionary, else leaves the weight
unchanged.
"""

function foralledgesupdatewts(s::Stinger, v::Int64, wts::Dict{Int64, Int64})
ebpool_priv_ptr = storageptr(s) + s[ebpool_start] * (sizeof(UInt8)) + sizeof(UInt64) * 2
current_eb_ptr = ebpool_priv_ptr + getvertex(s, v).edges * (sizeof(StingerEdgeBlock) + sizeof(StingerEdge)*NUMEDGEBLOCKS)
while current_eb_ptr != ebpool_priv_ptr
current_eb = unsafe_load(convert(Ptr{StingerEdgeBlock}, current_eb_ptr))
for i=1:current_eb.high
current_edge = unsafe_load(convert(Ptr{StingerEdge}, current_eb_ptr+sizeof(StingerEdgeBlock)), i)
direction, neighbor = edgeparse(current_edge)
edge_ptr = current_eb_ptr+sizeof(StingerEdgeBlock) + (i-1) * sizeof(StingerEdge)
unsafe_store!(
convert(Ptr{Int64}, edge_ptr + sizeof(Int64)),
current_edge.weight + get(wts, neighbor, 0)
)
end
current_eb_ptr = ebpool_priv_ptr + current_eb.next * (sizeof(StingerEdgeBlock) + sizeof(StingerEdge)*NUMEDGEBLOCKS);
end
end