// Build the kmerindex for filtering.
func (p *PALS) BuildIndex() error {
p.notify("Indexing")
ki, err := kmerindex.New(p.FilterParams.WordSize, p.target)
if err != nil {
return err
} else {
ki.Build()
p.notify("Indexed")
}
p.index = ki
p.hitFilter = filter.New(p.index, p.FilterParams)
return nil
}
func (s *S) TestFilterAndMerge(c *check.C) {
l := [...]byte{'A', 'C', 'G', 'T'}
Q := len(l)
a := &linear.Seq{Seq: make(alphabet.Letters, 0, util.Pow(Q, k))}
a.Alpha = alphabet.DNA
for _, i := range util.DeBruijn(byte(Q), k) {
a.Seq = append(a.Seq, alphabet.Letter(l[i]))
}
b := &linear.Seq{Seq: make(alphabet.Letters, 0, util.Pow(Q, k-1))}
// b.Alpha = alphabet.DNA // Not actually required for this use.
for _, i := range util.DeBruijn(byte(Q), k-1) {
b.Seq = append(b.Seq, alphabet.Letter(l[i]))
}
i, err := kmerindex.New(int(k), a)
if err != nil {
c.Fatalf("Failed to create kmerindex: %v", err)
}
i.Build()
p := &Params{WordSize: int(k), MinMatch: 50, MaxError: 4, TubeOffset: 32}
f := New(i, p)
var sorter *morass.Morass
if sorter, err = morass.New(Hit{}, "", "", 2<<20, false); err != nil {
c.Fatalf("Failed to create morass: %v", err)
}
f.Filter(b, false, false, sorter)
c.Check(sorter.Len(), check.Equals, int64(12))
r := make([]Hit, 1, sorter.Len())
for {
err = sorter.Pull(&r[len(r)-1])
if err != nil {
r = r[:len(r)-1]
break
}
r = append(r, Hit{})
}
want := map[Hit]bool{
Hit{From: 0, To: 163, Diagonal: 32}: true,
Hit{From: 141, To: 247, Diagonal: 64}: true,
Hit{From: 237, To: 433, Diagonal: 1120}: true,
Hit{From: 241, To: 347, Diagonal: 96}: true,
Hit{From: 341, To: 452, Diagonal: 128}: true,
Hit{From: 447, To: 565, Diagonal: 1952}: true,
Hit{From: 542, To: 628, Diagonal: 1984}: true,
Hit{From: 627, To: 814, Diagonal: 2592}: true,
Hit{From: 786, To: 898, Diagonal: 2624}: true,
Hit{From: 868, To: 939, Diagonal: 2880}: true,
Hit{From: 938, To: 997, Diagonal: 3040}: true,
Hit{From: 938, To: 1024, Diagonal: 3072}: true,
}
got := make(map[Hit]bool)
for _, h := range r {
got[h] = true
}
c.Check(got, check.DeepEquals, want)
c.Check(sort.IsSorted(hits(r)), check.Equals, true)
m := NewMerger(i, b, p, 5, false)
for _, h := range r {
m.MergeFilterHit(&h)
}
t := m.FinaliseMerge()
sorter.CleanUp()
c.Check(len(t), check.Equals, 6)
la, lb := t.Sum()
c.Check(la, check.Equals, 1257)
c.Check(lb, check.Equals, 402)
c.Check(t, check.DeepEquals, Trapezoids{
{Top: 452, Bottom: 0, Left: -128, Right: 3},
{Top: 433, Bottom: 237, Left: -1120, Right: -1085},
{Top: 628, Bottom: 447, Left: -1984, Right: -1917},
{Top: 898, Bottom: 627, Left: -2624, Right: -2557},
{Top: 939, Bottom: 868, Left: -2880, Right: -2845},
{Top: 1024, Bottom: 938, Left: -3072, Right: -3005},
})
}