org.pmml4s.common.Vector.scala Maven / Gradle / Ivy
/*
* Copyright (c) 2017-2019 AutoDeploy AI
*
* Licensed 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.pmml4s.common
import java.util
import scala.reflect.ClassTag
trait Vector[@specialized(Int, Long, Float, Double) V] extends java.io.Serializable {
def size: Int
def apply(i: Int): V
def length: Int = size
def toArray(implicit cm: ClassTag[V]) = {
val result = new Array[V](length)
var i = 0
while (i < length) {
result(i) = apply(i)
i += 1
}
result
}
}
class DenseVector[@specialized(Int, Long, Float, Double) V](val values: Array[V]) extends Vector[V] {
override def size: Int = values.length
override def apply(i: Int): V = values(i)
override def toArray(implicit cm: ClassTag[V]): Array[V] = values
}
class SparseVector[@specialized(Int, Long, Float, Double) V](
override val size: Int,
val indices: Array[Int],
val values: Array[V],
val default: V) extends Vector[V] {
override def apply(i: Int): V = {
val idx = index(i)
if (idx >= 0) values(idx) else default
}
protected final def index(i: Int): Int = {
util.Arrays.binarySearch(indices, 0, indices.length, i)
}
}