org.apache.flink.runtime.util.LongArrayList Maven / Gradle / Ivy
/*
* 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.flink.runtime.util;
import java.util.Arrays;
/** Minimal implementation of an array-backed list of longs */
public class LongArrayList {
private int size;
private long[] array;
public LongArrayList(int capacity) {
this.size = 0;
this.array = new long[capacity];
}
public int size() {
return size;
}
public boolean add(long number) {
grow(size + 1);
array[size++] = number;
return true;
}
public long removeLong(int index) {
if (index >= size) {
throw new IndexOutOfBoundsException(
"Index (" + index + ") is greater than or equal to list size (" + size + ")");
}
final long old = array[index];
size--;
if (index != size) {
System.arraycopy(array, index + 1, array, index, size - index);
}
return old;
}
public void clear() {
size = 0;
}
public boolean isEmpty() {
return (size == 0);
}
public long[] toArray() {
return Arrays.copyOf(array, size);
}
private void grow(int length) {
if (length > array.length) {
final int newLength =
(int) Math.max(Math.min(2L * array.length, Integer.MAX_VALUE - 8), length);
final long[] t = new long[newLength];
System.arraycopy(array, 0, t, 0, size);
array = t;
}
}
}