/*
 * 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.hudi.table.format.cow.utils;

import java.util.Arrays;

/**
 * Minimal implementation of an array-backed list of longs.
 *
 * <p>Note: Vendored from Apache Flink ({@code org.apache.flink.runtime.util.LongArrayList}) to
 * avoid depending on {@code @Internal} Flink runtime classes from Hudi's parquet reader.
 */
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;
    }
  }
}
