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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
package mutable
import compat.Platform.arraycopy
import scala.reflect.ClassManifest
import parallel.mutable.ParArray
/** This class serves as a wrapper for `Array`s with all the operations found in
* indexed sequences. Where needed, instances of arrays are implicitly converted
* into this class.
*
* The difference between this class and `WrappedArray` is that calling transformer
* methods such as `filter` and `map` will yield an array, whereas a `WrappedArray`
* will remain a `WrappedArray`.
*
* @since 2.8
*
* @tparam T type of the elements contained in this array.
*
* @define Coll ArrayOps
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
abstract class ArrayOps[T] extends ArrayLike[T, Array[T]] with CustomParallelizable[T, ParArray[T]] {
private def rowBuilder[U]: Builder[U, Array[U]] =
Array.newBuilder(
ClassManifest.fromClass(
repr.getClass.getComponentType.getComponentType.asInstanceOf[Predef.Class[U]]))
override def copyToArray[U >: T](xs: Array[U], start: Int, len: Int) {
var l = len
if (repr.length < l) l = repr.length
if (xs.length - start < l) l = xs.length - start max 0
Array.copy(repr, 0, xs, start, l)
}
override def toArray[U >: T : ClassManifest]: Array[U] =
if (implicitly[ClassManifest[U]].erasure eq repr.getClass.getComponentType)
repr.asInstanceOf[Array[U]]
else
super.toArray[U]
override def par = ParArray.handoff(repr)
/** Flattens a two-dimensional array by concatenating all its rows
* into a single array.
*
* @tparam U Type of row elements.
* @param asArray A function that converts elements of this array to rows - arrays of type `U`.
* @return An array obtained by concatenating rows of this array.
*/
def flatten[U, To](implicit asTrav: T => collection.Traversable[U], m: ClassManifest[U]): Array[U] = {
val b = Array.newBuilder[U]
b.sizeHint(map{case is: IndexedSeq[_] => is.size case _ => 0} sum)
for (xs <- this)
b ++= asTrav(xs)
b.result
}
/** Transposes a two dimensional array.
*
* @tparam U Type of row elements.
* @param asArray A function that converts elements of this array to rows - arrays of type `U`.
* @return An array obtained by replacing elements of this arrays with rows the represent.
*/
def transpose[U](implicit asArray: T => Array[U]): Array[Array[U]] = {
val bs = asArray(head) map (_ => rowBuilder[U])
for (xs <- this) {
var i = 0
for (x <- asArray(xs)) {
bs(i) += x
i += 1
}
}
val bb: Builder[Array[U], Array[Array[U]]] = Array.newBuilder(
ClassManifest.fromClass(
repr.getClass.getComponentType.asInstanceOf[Predef.Class[Array[U]]]))
for (b <- bs) bb += b.result
bb.result
}
def seq = this.iterator
}
/**
* A companion object for `ArrayOps`.
*
* @since 2.8
*/
object ArrayOps {
/** A class of `ArrayOps` for arrays containing reference types. */
class ofRef[T <: AnyRef](override val repr: Array[T]) extends ArrayOps[T] with ArrayLike[T, Array[T]] {
override protected[this] def thisCollection: WrappedArray[T] = new WrappedArray.ofRef[T](repr)
override protected[this] def toCollection(repr: Array[T]): WrappedArray[T] = new WrappedArray.ofRef[T](repr)
override protected[this] def newBuilder = new ArrayBuilder.ofRef[T]()(
ClassManifest.classType[T](repr.getClass.getComponentType))
def length: Int = repr.length
def apply(index: Int): T = repr(index)
def update(index: Int, elem: T) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `byte`s. */
class ofByte(override val repr: Array[Byte]) extends ArrayOps[Byte] with ArrayLike[Byte, Array[Byte]] {
override protected[this] def thisCollection: WrappedArray[Byte] = new WrappedArray.ofByte(repr)
override protected[this] def toCollection(repr: Array[Byte]): WrappedArray[Byte] = new WrappedArray.ofByte(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofByte
def length: Int = repr.length
def apply(index: Int): Byte = repr(index)
def update(index: Int, elem: Byte) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `short`s. */
class ofShort(override val repr: Array[Short]) extends ArrayOps[Short] with ArrayLike[Short, Array[Short]] {
override protected[this] def thisCollection: WrappedArray[Short] = new WrappedArray.ofShort(repr)
override protected[this] def toCollection(repr: Array[Short]): WrappedArray[Short] = new WrappedArray.ofShort(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofShort
def length: Int = repr.length
def apply(index: Int): Short = repr(index)
def update(index: Int, elem: Short) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `char`s. */
class ofChar(override val repr: Array[Char]) extends ArrayOps[Char] with ArrayLike[Char, Array[Char]] {
override protected[this] def thisCollection: WrappedArray[Char] = new WrappedArray.ofChar(repr)
override protected[this] def toCollection(repr: Array[Char]): WrappedArray[Char] = new WrappedArray.ofChar(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofChar
def length: Int = repr.length
def apply(index: Int): Char = repr(index)
def update(index: Int, elem: Char) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `int`s. */
class ofInt(override val repr: Array[Int]) extends ArrayOps[Int] with ArrayLike[Int, Array[Int]] {
override protected[this] def thisCollection: WrappedArray[Int] = new WrappedArray.ofInt(repr)
override protected[this] def toCollection(repr: Array[Int]): WrappedArray[Int] = new WrappedArray.ofInt(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofInt
def length: Int = repr.length
def apply(index: Int): Int = repr(index)
def update(index: Int, elem: Int) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `long`s. */
class ofLong(override val repr: Array[Long]) extends ArrayOps[Long] with ArrayLike[Long, Array[Long]] {
override protected[this] def thisCollection: WrappedArray[Long] = new WrappedArray.ofLong(repr)
override protected[this] def toCollection(repr: Array[Long]): WrappedArray[Long] = new WrappedArray.ofLong(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofLong
def length: Int = repr.length
def apply(index: Int): Long = repr(index)
def update(index: Int, elem: Long) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `float`s. */
class ofFloat(override val repr: Array[Float]) extends ArrayOps[Float] with ArrayLike[Float, Array[Float]] {
override protected[this] def thisCollection: WrappedArray[Float] = new WrappedArray.ofFloat(repr)
override protected[this] def toCollection(repr: Array[Float]): WrappedArray[Float] = new WrappedArray.ofFloat(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofFloat
def length: Int = repr.length
def apply(index: Int): Float = repr(index)
def update(index: Int, elem: Float) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `double`s. */
class ofDouble(override val repr: Array[Double]) extends ArrayOps[Double] with ArrayLike[Double, Array[Double]] {
override protected[this] def thisCollection: WrappedArray[Double] = new WrappedArray.ofDouble(repr)
override protected[this] def toCollection(repr: Array[Double]): WrappedArray[Double] = new WrappedArray.ofDouble(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofDouble
def length: Int = repr.length
def apply(index: Int): Double = repr(index)
def update(index: Int, elem: Double) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays containing `boolean`s. */
class ofBoolean(override val repr: Array[Boolean]) extends ArrayOps[Boolean] with ArrayLike[Boolean, Array[Boolean]] {
override protected[this] def thisCollection: WrappedArray[Boolean] = new WrappedArray.ofBoolean(repr)
override protected[this] def toCollection(repr: Array[Boolean]): WrappedArray[Boolean] = new WrappedArray.ofBoolean(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofBoolean
def length: Int = repr.length
def apply(index: Int): Boolean = repr(index)
def update(index: Int, elem: Boolean) { repr(index) = elem }
}
/** A class of `ArrayOps` for arrays of `Unit` types. */
class ofUnit(override val repr: Array[Unit]) extends ArrayOps[Unit] with ArrayLike[Unit, Array[Unit]] {
override protected[this] def thisCollection: WrappedArray[Unit] = new WrappedArray.ofUnit(repr)
override protected[this] def toCollection(repr: Array[Unit]): WrappedArray[Unit] = new WrappedArray.ofUnit(repr)
override protected[this] def newBuilder = new ArrayBuilder.ofUnit
def length: Int = repr.length
def apply(index: Int): Unit = repr(index)
def update(index: Int, elem: Unit) { repr(index) = elem }
}
}
|
