blob: 20554f0aaba708e5a5a49fc93449f1bafada8d2e (
plain) (
blame)
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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.util.collection
/**
* An append-only, non-threadsafe, array-backed vector that is optimized for primitive types.
*/
private[spark]
class PrimitiveVector[@specialized(Long, Int, Double) V: ClassManifest](initialSize: Int = 64) {
private var _numElements = 0
private var _array: Array[V] = _
// NB: This must be separate from the declaration, otherwise the specialized parent class
// will get its own array with the same initial size.
_array = new Array[V](initialSize)
def apply(index: Int): V = {
require(index < _numElements)
_array(index)
}
def +=(value: V) {
if (_numElements == _array.length) {
resize(_array.length * 2)
}
_array(_numElements) = value
_numElements += 1
}
def capacity: Int = _array.length
def length: Int = _numElements
def size: Int = _numElements
/** Gets the underlying array backing this vector. */
def array: Array[V] = _array
/** Trims this vector so that the capacity is equal to the size. */
def trim(): PrimitiveVector[V] = resize(size)
/** Resizes the array, dropping elements if the total length decreases. */
def resize(newLength: Int): PrimitiveVector[V] = {
val newArray = new Array[V](newLength)
_array.copyToArray(newArray)
_array = newArray
if (newLength < _numElements) {
_numElements = newLength
}
this
}
}
|
