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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
package forge.util
import play.api.libs.json._
import scala.collection.mutable
/**
* A collection with enforced uniqueness, fast contains and deterministic
* ordering. Raises an exception if a duplicate is found; call
* `toSeq.distinct` if you explicitly want to make it swallow duplicates
*/
trait OSet[V] extends TraversableOnce[V]{
def contains(v: V): Boolean
def items: IndexedSeq[V]
def flatMap[T](f: V => TraversableOnce[T]): OSet[T]
def map[T](f: V => T): OSet[T]
def filter(f: V => Boolean): OSet[V]
def collect[T](f: PartialFunction[V, T]): OSet[T]
def zipWithIndex: OSet[(V, Int)]
def reverse: OSet[V]
}
object OSet{
implicit def jsonFormat[T: Format]: Format[OSet[T]] = new Format[OSet[T]] {
def writes(o: OSet[T]) = JsArray(o.items.map(implicitly[Format[T]].writes))
def reads(json: JsValue) = json match{
case x: JsArray => implicitly[Format[Seq[T]]].reads(x).map(OSet.from)
case _ => JsError("OSet needs to be an Array")
}
}
def apply[V](items: V*) = from(items)
def from[V](items: TraversableOnce[V]): OSet[V] = {
val set = new OSet.Mutable[V]()
items.foreach(set.append)
set
}
class Mutable[V]() extends OSet[V]{
private[this] val set0 = mutable.LinkedHashSet.empty[V]
def contains(v: V) = set0.contains(v)
def append(v: V) = if (!contains(v)){
set0.add(v)
}else {
throw new Exception("Duplicated item inserted into OrderedSet: " + v)
}
def appendAll(vs: Seq[V]) = vs.foreach(append)
def items: IndexedSeq[V] = set0.toIndexedSeq
def set: collection.Set[V] = set0
def map[T](f: V => T): OSet[T] = {
val output = new OSet.Mutable[T]
for(i <- items) output.append(f(i))
output
}
def flatMap[T](f: V => TraversableOnce[T]): OSet[T] = {
val output = new OSet.Mutable[T]
for(i <- items) for(i0 <- f(i)) output.append(i0)
output
}
def filter(f: V => Boolean): OSet[V] = {
val output = new OSet.Mutable[V]
for(i <- items) if (f(i)) output.append(i)
output
}
def collect[T](f: PartialFunction[V, T]) = this.filter(f.isDefinedAt).map(x => f(x))
def zipWithIndex = {
var i = 0
this.map{ x =>
i += 1
(x, i-1)
}
}
def reverse = OSet.from(items.reverseIterator)
// Members declared in scala.collection.GenTraversableOnce
def isTraversableAgain: Boolean = items.isTraversableAgain
def toIterator: Iterator[V] = items.toIterator
def toStream: Stream[V] = items.toStream
// Members declared in scala.collection.TraversableOnce
def copyToArray[B >: V](xs: Array[B],start: Int,len: Int): Unit = items.copyToArray(xs, start, len)
def exists(p: V => Boolean): Boolean = items.exists(p)
def find(p: V => Boolean): Option[V] = items.find(p)
def forall(p: V => Boolean): Boolean = items.forall(p)
def foreach[U](f: V => U): Unit = items.foreach(f)
def hasDefiniteSize: Boolean = items.hasDefiniteSize
def isEmpty: Boolean = items.isEmpty
def seq: scala.collection.TraversableOnce[V] = items
def toTraversable: Traversable[V] = items
override def hashCode() = items.hashCode()
override def equals(other: Any) = other match{
case s: OSet[_] => items.equals(s.items)
case _ => super.equals(other)
}
override def toString = items.mkString("OSet(", ", ", ")")
}
}
|
