/*
 * 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;
import java.util.NoSuchElementException;

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

  private int size;
  private int[] array;

  public IntArrayList(final int capacity) {
    this.size = 0;
    this.array = new int[capacity];
  }

  public int size() {
    return size;
  }

  public boolean add(final int number) {
    grow(size + 1);
    array[size++] = number;
    return true;
  }

  public int removeLast() {
    if (size == 0) {
      throw new NoSuchElementException();
    }
    --size;
    return array[size];
  }

  public void clear() {
    size = 0;
  }

  public boolean isEmpty() {
    return size == 0;
  }

  private void grow(final int length) {
    if (length > array.length) {
      final int newLength =
          (int) Math.max(Math.min(2L * array.length, Integer.MAX_VALUE - 8), length);
      final int[] t = new int[newLength];
      System.arraycopy(array, 0, t, 0, size);
      array = t;
    }
  }

  public int[] toArray() {
    return Arrays.copyOf(array, size);
  }

  public static final IntArrayList EMPTY =
      new IntArrayList(0) {

        @Override
        public boolean add(int number) {
          throw new UnsupportedOperationException();
        }

        @Override
        public int removeLast() {
          throw new UnsupportedOperationException();
        }
      };
}
