1 files changed, 53 insertions, 0 deletions
diff --git a/core/src/main/scala/org/apache/spark/util/collection/PrimitiveVector.scala b/core/src/main/scala/org/apache/spark/util/collection/PrimitiveVector.scala
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+++ b/core/src/main/scala/org/apache/spark/util/collection/PrimitiveVector.scala
@@ -0,0 +1,53 @@
+/*
+ * 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
+
+import scala.reflect.ClassTag
+
+/** Provides a simple, non-threadsafe, array-backed vector that can store primitives. */
+private[spark]
+class PrimitiveVector[@specialized(Long, Int, Double) V: ClassTag](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. TODO: Figure out why...
+  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 length = numElements
+
+  def getUnderlyingArray = array
+
+  /** Resizes the array, dropping elements if the total length decreases. */
+  def resize(newLength: Int) {
+    val newArray = new Array[V](newLength)
+    array.copyToArray(newArray)
+    array = newArray
+  }
+}