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writer.clj
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writer.clj
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(ns cljam.io.twobit.writer
(:require [clojure.java.io :as cio]
[cljam.io.protocols :as protocols]
[cljam.io.util.lsb :as lsb]
[cljam.util :as util])
(:import [java.io Closeable OutputStream DataOutputStream BufferedOutputStream FileOutputStream]
[java.nio ByteBuffer]))
(declare write-sequences)
(deftype TwoBitWriter [url writer file-output-stream index]
Closeable
(close [this]
(.close ^Closeable (.writer this)))
protocols/IWriter
(writer-url [this]
(.url this))
protocols/ISequenceWriter
(write-sequences [this seqs]
(write-sequences this seqs)))
(defn writer
"Returns a 2bit writer of f."
[f {:keys [index]}]
(let [abs-f (.getAbsolutePath (cio/file f))
fos (FileOutputStream. abs-f)
bos (BufferedOutputStream. fos)
dos (DataOutputStream. bos)]
(TwoBitWriter. (util/as-url abs-f) dos fos index)))
(defn- write-file-header!
"Writes a 2bit file header. Supports little-endian only."
[w nseq]
(lsb/write-int w 0x1A412743)
(lsb/write-int w 0)
(lsb/write-int w nseq)
(lsb/write-int w 0))
(defn- mask-regions
"Returns a sequence of [start length] of masked regions."
[^String s]
(let [len (.length s)]
(loop [r (transient [])
p nil
l nil
i 0]
(if (= i len)
(if p
(persistent! (conj! r [p l]))
(persistent! r))
(if (<= (int \a) (int (.charAt s (int i))))
(if p
(recur r p (inc l) (inc i))
(recur r i 1 (inc i)))
(if p
(recur (conj! r [p l]) nil nil (inc i))
(recur r nil nil (inc i))))))))
(defn- amb-regions
"Returns a sequence of [start length] of N regions."
[^String s]
(let [len (.length s)]
(loop [r (transient [])
p nil
l nil
i 0]
(if (= i len)
(if p
(persistent! (conj! r [p l]))
(persistent! r))
(if (= \N (.charAt s (int i)))
(if p
(recur r p (inc l) (inc i))
(recur r i 1 (inc i)))
(if p
(recur (conj! r [p l]) nil nil (inc i))
(recur r nil nil (inc i))))))))
(defn- index-size
"Number of bytes required for index."
[seqs]
(-> (fn [{:keys [name]}]
(+ 1 (count name) 4))
map
(transduce + 0 seqs)))
(defn- write-index!
[w idx]
(loop [offset (+ (* 4 4) (reduce + (map #(+ 1 (count (:name %)) 4) idx)))
idx idx]
(when-let [{:keys [name len]} (first idx)]
(lsb/write-ubyte w (count name))
(lsb/write-string w name)
(lsb/write-int w offset)
(recur (+ offset
(if-let [{:keys [ambs masks]} (first idx)]
(+ 4 4 (* 2 4 (count ambs)) 4 (* 2 4 (count masks)) 4)
0) ; dummy
(quot (dec (+ len 4)) 4))
(next idx)))))
(def ^:private
char->twobit
(doto (byte-array 128)
(aset-byte (int \C) 1)
(aset-byte (int \c) 1)
(aset-byte (int \A) 2)
(aset-byte (int \a) 2)
(aset-byte (int \G) 3)
(aset-byte (int \g) 3)))
(defn write-twobit!
"Encodes a sequence into twobit format."
[^OutputStream o ^String s]
(let [len (.length s)
bb (ByteBuffer/wrap (.getBytes s))
table ^bytes char->twobit]
(dotimes [_ (quot len 4)]
(->> (bit-or
(bit-shift-left (aget table (.get bb)) 6)
(bit-shift-left (aget table (.get bb)) 4)
(bit-shift-left (aget table (.get bb)) 2)
(aget table (.get bb)))
unchecked-int
(.write o)))
(when (pos? (mod len 4))
(loop [b 0 i (mod len 4) j 1]
(if (pos? i)
(recur (bit-or b (bit-shift-left (aget table (.get bb)) (* 2 (- 4 j)))) (dec i) (inc j))
(.write o (unchecked-int b)))))))
(defn- write-sequence!
"Writes a single sequence entry to writer."
[w sequence idx]
(let [name (or (:name sequence) (:rname sequence))
seq-data (or (:seq sequence) (:sequence sequence))
{:keys [len ambs masks]} (first (filter #(= (:name %) name) idx))]
(lsb/write-int w len)
(lsb/write-int w (count ambs))
(doseq [[s _] ambs]
(lsb/write-int w s))
(doseq [[_ l] ambs]
(lsb/write-int w l))
(lsb/write-int w (count masks))
(doseq [[s _] masks]
(lsb/write-int w s))
(doseq [[_ l] masks]
(lsb/write-int w l))
(lsb/write-int w 0)
(write-twobit! w seq-data)))
(defn- write-sequences-without-index
[^TwoBitWriter wtr xs]
(let [idx (map (fn [{:keys [name rname seq sequence]}]
(let [seq-data (or seq sequence)]
{:name (or name rname)
:len (count seq-data)
:masks (mask-regions seq-data)
:ambs (amb-regions seq-data)}))
xs)]
(write-file-header! (.writer wtr) (count xs))
(write-index! (.writer wtr) idx)
(doseq [sequence xs]
(write-sequence! (.writer wtr) sequence idx))))
(defn- write-sequences-with-index
[^TwoBitWriter wtr idx xs]
(let [idx-atom (atom idx)]
(write-file-header! (.writer wtr) (count @idx-atom))
(write-index! (.writer wtr) @idx-atom)
(doseq [sequence xs]
(let [name (or (:name sequence) (:rname sequence))
seq-data (or (:seq sequence) (:sequence sequence))
masks (mask-regions seq-data)
ambs (amb-regions seq-data)
i (first (keep-indexed #(if (= (:name %2) name) %1) @idx-atom))]
(swap! idx-atom update i assoc :masks masks :ambs ambs))
(write-sequence! (.writer wtr) sequence @idx-atom))
;; finalize
(.flush ^DataOutputStream (.writer wtr))
(let [ch (.getChannel ^FileOutputStream (.file-output-stream wtr))]
(.position ch 16)
(write-index! ch @idx-atom))))
(defn write-sequences
"Writes all sequences to wtr. Input sequences must be a sequence of maps."
[^TwoBitWriter wtr xs]
(if (nil? (.index wtr))
(write-sequences-without-index wtr xs)
(write-sequences-with-index wtr (.index wtr) xs)))