1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
package sandcrawler
import scala.math
import scala.util.parsing.json.JSON
import scala.util.parsing.json.JSONObject
import cascading.flow.FlowDef
import com.twitter.scalding._
import com.twitter.scalding.typed.TDsl._
case class MapFeatures(slug : String, json : String)
case class ReduceFeatures(json : String)
case class ReduceOutput(val slug : String, score : Int, json1 : String, json2 : String)
abstract class Scorable {
def getInputPipe(args : Args)(implicit mode : Mode, flowDef : FlowDef) : TypedPipe[(String, ReduceFeatures)] =
{
getFeaturesPipe(args)
.filter { entry => Scorable.isValidSlug(entry.slug) }
.groupBy { case MapFeatures(slug, json) => slug }
.map { tuple =>
val (slug : String, features : MapFeatures) = tuple
(slug, ReduceFeatures(features.json))
}
}
// abstract methods
def getSource(args : Args) : Source
def getFeaturesPipe(args : Args)(implicit mode : Mode, flowDef : FlowDef) : TypedPipe[MapFeatures]
}
object Scorable {
val NoSlug = "NO SLUG" // Used for slug if title is empty or unparseable
def isValidSlug(slug : String) : Boolean = {
slug != NoSlug
}
def jsonToMap(json : String) : Option[Map[String, Any]] = {
// https://stackoverflow.com/a/32717262/631051
val jsonObject = JSON.parseFull(json)
if (jsonObject == None) {
None
} else {
Some(jsonObject.get.asInstanceOf[Map[String, Any]])
}
}
def getStringOption(optionalMap : Option[Map[String, Any]], key : String) : Option[String] = {
optionalMap match {
case None => None
case Some(map) => if (map contains key) Some(map(key).asInstanceOf[String]) else None
}
}
// Caller is responsible for ensuring that key is a String in map.
// TODO: Add and handle ClassCastException
def getString(map : Map[String, Any], key : String) : String = {
assert(map contains key)
map(key).asInstanceOf[String]
}
val MaxScore = 1000
def computeSimilarity(features1 : ReduceFeatures, features2 : ReduceFeatures) : Int = {
val json1 = jsonToMap(features1.json)
val json2 = jsonToMap(features2.json)
getStringOption(json1, "title") match {
case None => 0
case Some(title1) => {
getStringOption(json2, "title") match {
case None => 0
case Some(title2) =>
(StringUtilities.similarity(title1, title2) * MaxScore).toInt
}
}
}
}
}
|
