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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2010, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
package immutable
import generic._
import mutable.Builder
/** $factoryInfo
* @define Coll immutable.TreeMap
* @define coll immutable tree map
*/
object TreeMap extends ImmutableSortedMapFactory[TreeMap] {
def empty[A, B](implicit ord: Ordering[A]) = new TreeMap[A, B]()(ord)
/** $sortedMapCanBuildFromInfo */
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), TreeMap[A, B]] = new SortedMapCanBuildFrom[A, B]
private def make[A, B](s: Int, t: RedBlack[A]#Tree[B])(implicit ord: Ordering[A]) = new TreeMap[A, B](s, t)(ord)
}
/** This class implements immutable maps using a tree.
*
* @tparam A the type of the keys contained in this tree map.
* @tparam B the type of the values associated with the keys.
* @param ordering the implicit ordering used to compare objects of type `A`.
*
* @author Erik Stenman
* @author Matthias Zenger
* @version 1.1, 03/05/2004
* @since 1
* @define Coll immutable.TreeMap
* @define coll immutable tree map
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
@serializable
class TreeMap[A, +B](override val size: Int, t: RedBlack[A]#Tree[B])(implicit val ordering: Ordering[A])
extends RedBlack[A]
with SortedMap[A, B]
with SortedMapLike[A, B, TreeMap[A, B]]
with MapLike[A, B, TreeMap[A, B]] {
def isSmaller(x: A, y: A) = ordering.lt(x, y)
override protected[this] def newBuilder : Builder[(A, B), TreeMap[A, B]] =
TreeMap.newBuilder[A, B]
def this()(implicit ordering: Ordering[A]) = this(0, null)(ordering)
protected val tree: RedBlack[A]#Tree[B] = if (size == 0) Empty else t
override def rangeImpl(from : Option[A], until : Option[A]): TreeMap[A,B] = {
val ntree = tree.range(from,until)
new TreeMap[A,B](ntree.count, ntree)
}
override def firstKey = t.first
override def lastKey = t.last
override def compare(k0: A, k1: A): Int = ordering.compare(k0, k1)
/** A factory to create empty maps of the same type of keys.
*/
override def empty: TreeMap[A, B] = TreeMap.empty[A, B](ordering)
/** A new TreeMap with the entry added is returned,
* if key is <em>not</em> in the TreeMap, otherwise
* the key is updated with the new entry.
*
* @tparam B1 type of the value of the new binding which is a supertype of `B`
* @param key the key that should be updated
* @param value the value to be associated with `key`
* @return a new $coll with the updated binding
*/
override def updated [B1 >: B](key: A, value: B1): TreeMap[A, B1] = {
val newsize = if (tree.lookup(key).isEmpty) size + 1 else size
TreeMap.make(newsize, tree.update(key, value))
}
/** Add a key/value pair to this map.
* @tparam B1 type of the value of the new binding, a supertype of `B`
* @param kv the key/value pair
* @return A new $coll with the new binding added to this map
*/
override def + [B1 >: B] (kv: (A, B1)): TreeMap[A, B1] = updated(kv._1, kv._2)
/** Adds two or more elements to this collection and returns
* either the collection itself (if it is mutable), or a new collection
* with the added elements.
*
* @tparam B1 type of the values of the new bindings, a supertype of `B`
* @param elem1 the first element to add.
* @param elem2 the second element to add.
* @param elems the remaining elements to add.
* @return a new $coll with the updated bindings
*/
override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): TreeMap[A, B1] =
this + elem1 + elem2 ++ elems
/** A new TreeMap with the entry added is returned,
* assuming that key is <em>not</em> in the TreeMap.
*
* @tparam B1 type of the values of the new bindings, a supertype of `B`
* @param key the key to be inserted
* @param value the value to be associated with `key`
* @return a new $coll with the inserted binding, if it wasn't present in the map
*/
def insert [B1 >: B](key: A, value: B1): TreeMap[A, B1] = {
assert(tree.lookup(key).isEmpty)
TreeMap.make(size + 1, tree.update(key, value))
}
def - (key:A): TreeMap[A, B] =
if (tree.lookup(key).isEmpty) this
else TreeMap.make(size - 1, tree.delete(key))
/** Check if this map maps `key` to a value and return the
* value if it exists.
*
* @param key the key of the mapping of interest
* @return the value of the mapping, if it exists
*/
override def get(key: A): Option[B] = tree.lookup(key) match {
case n: NonEmpty[b] => Some(n.value)
case _ => None
}
/** Creates a new iterator over all elements contained in this
* object.
*
* @return the new iterator
*/
def iterator: Iterator[(A, B)] = tree.toStream.iterator
override def toStream: Stream[(A, B)] = tree.toStream
override def foreach[U](f : ((A,B)) => U) = tree foreach { case (x, y) => f(x, y) }
}
|
