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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala
package collection
package mutable
import scala.reflect.ClassTag
import scala.runtime.BoxedUnit
import scala.collection.generic._
import scala.collection.parallel.mutable.ParArray
import scala.util.hashing.MurmurHash3
import java.util.Arrays
/**
* A class representing `Array[T]`.
*
* @tparam T type of the elements in this wrapped array.
*
* @author Martin Odersky, Stephane Micheloud
* @version 1.0
* @since 2.8
* @define Coll `WrappedArray`
* @define coll wrapped array
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
abstract class WrappedArray[T]
extends AbstractSeq[T]
with IndexedSeq[T]
with ArrayLike[T, WrappedArray[T]]
with CustomParallelizable[T, ParArray[T]]
{
override protected[this] def thisCollection: WrappedArray[T] = this
override protected[this] def toCollection(repr: WrappedArray[T]): WrappedArray[T] = repr
/** The tag of the element type */
def elemTag: ClassTag[T]
@deprecated("use elemTag instead", "2.10.0")
def elemManifest: ClassManifest[T] = ClassManifest.fromClass[T](elemTag.runtimeClass.asInstanceOf[Class[T]])
/** The length of the array */
def length: Int
/** The element at given index */
def apply(index: Int): T
/** Update element at given index */
def update(index: Int, elem: T): Unit
/** The underlying array */
def array: Array[T]
override def par = ParArray.handoff(array)
private def elementClass: Class[_] =
array.getClass.getComponentType
override def toArray[U >: T : ClassTag]: Array[U] = {
val thatElementClass = implicitly[ClassTag[U]].runtimeClass
if (elementClass eq thatElementClass)
array.asInstanceOf[Array[U]]
else
super.toArray[U]
}
override def stringPrefix = "WrappedArray"
/** Clones this object, including the underlying Array. */
override def clone(): WrappedArray[T] = WrappedArray make array.clone()
/** Creates new builder for this collection ==> move to subclasses
*/
override protected[this] def newBuilder: Builder[T, WrappedArray[T]] =
new WrappedArrayBuilder[T](elemTag)
}
/** A companion object used to create instances of `WrappedArray`.
*/
object WrappedArray {
// This is reused for all calls to empty.
private val EmptyWrappedArray = new ofRef[AnyRef](new Array[AnyRef](0))
def empty[T <: AnyRef]: WrappedArray[T] = EmptyWrappedArray.asInstanceOf[WrappedArray[T]]
// If make is called explicitly we use whatever we're given, even if it's
// empty. This may be unnecessary (if WrappedArray is to honor the collections
// contract all empty ones must be equal, so discriminating based on the reference
// equality of an empty array should not come up) but we may as well be
// conservative since wrapRefArray contributes most of the unnecessary allocations.
def make[T](x: AnyRef): WrappedArray[T] = (x match {
case null => null
case x: Array[AnyRef] => new ofRef[AnyRef](x)
case x: Array[Int] => new ofInt(x)
case x: Array[Double] => new ofDouble(x)
case x: Array[Long] => new ofLong(x)
case x: Array[Float] => new ofFloat(x)
case x: Array[Char] => new ofChar(x)
case x: Array[Byte] => new ofByte(x)
case x: Array[Short] => new ofShort(x)
case x: Array[Boolean] => new ofBoolean(x)
case x: Array[Unit] => new ofUnit(x)
}).asInstanceOf[WrappedArray[T]]
implicit def canBuildFrom[T](implicit m: ClassTag[T]): CanBuildFrom[WrappedArray[_], T, WrappedArray[T]] =
new CanBuildFrom[WrappedArray[_], T, WrappedArray[T]] {
def apply(from: WrappedArray[_]): Builder[T, WrappedArray[T]] =
ArrayBuilder.make[T]()(m) mapResult WrappedArray.make[T]
def apply: Builder[T, WrappedArray[T]] =
ArrayBuilder.make[T]()(m) mapResult WrappedArray.make[T]
}
def newBuilder[A]: Builder[A, IndexedSeq[A]] = new ArrayBuffer
final class ofRef[T <: AnyRef](val array: Array[T]) extends WrappedArray[T] with Serializable {
lazy val elemTag = ClassTag[T](array.getClass.getComponentType)
def length: Int = array.length
def apply(index: Int): T = array(index).asInstanceOf[T]
def update(index: Int, elem: T) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofRef[_] => Arrays.equals(array.asInstanceOf[Array[AnyRef]], that.array.asInstanceOf[Array[AnyRef]])
case _ => super.equals(that)
}
}
final class ofByte(val array: Array[Byte]) extends WrappedArray[Byte] with Serializable {
def elemTag = ClassTag.Byte
def length: Int = array.length
def apply(index: Int): Byte = array(index)
def update(index: Int, elem: Byte) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedBytesHash(array)
override def equals(that: Any) = that match {
case that: ofByte => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofShort(val array: Array[Short]) extends WrappedArray[Short] with Serializable {
def elemTag = ClassTag.Short
def length: Int = array.length
def apply(index: Int): Short = array(index)
def update(index: Int, elem: Short) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofShort => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofChar(val array: Array[Char]) extends WrappedArray[Char] with Serializable {
def elemTag = ClassTag.Char
def length: Int = array.length
def apply(index: Int): Char = array(index)
def update(index: Int, elem: Char) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofChar => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofInt(val array: Array[Int]) extends WrappedArray[Int] with Serializable {
def elemTag = ClassTag.Int
def length: Int = array.length
def apply(index: Int): Int = array(index)
def update(index: Int, elem: Int) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofInt => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofLong(val array: Array[Long]) extends WrappedArray[Long] with Serializable {
def elemTag = ClassTag.Long
def length: Int = array.length
def apply(index: Int): Long = array(index)
def update(index: Int, elem: Long) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofLong => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofFloat(val array: Array[Float]) extends WrappedArray[Float] with Serializable {
def elemTag = ClassTag.Float
def length: Int = array.length
def apply(index: Int): Float = array(index)
def update(index: Int, elem: Float) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofFloat => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofDouble(val array: Array[Double]) extends WrappedArray[Double] with Serializable {
def elemTag = ClassTag.Double
def length: Int = array.length
def apply(index: Int): Double = array(index)
def update(index: Int, elem: Double) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofDouble => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofBoolean(val array: Array[Boolean]) extends WrappedArray[Boolean] with Serializable {
def elemTag = ClassTag.Boolean
def length: Int = array.length
def apply(index: Int): Boolean = array(index)
def update(index: Int, elem: Boolean) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofBoolean => Arrays.equals(array, that.array)
case _ => super.equals(that)
}
}
final class ofUnit(val array: Array[Unit]) extends WrappedArray[Unit] with Serializable {
def elemTag = ClassTag.Unit
def length: Int = array.length
def apply(index: Int): Unit = array(index)
def update(index: Int, elem: Unit) { array(index) = elem }
override def hashCode = MurmurHash3.wrappedArrayHash(array)
override def equals(that: Any) = that match {
case that: ofUnit => array.length == that.array.length
case _ => super.equals(that)
}
}
}
|
