package btools.util;

/**
 * dynamic list of primitive longs
 *
 * @author ab
 */
public class LongList {
  private long[] a;
  private int size;

  public LongList(int capacity) {
    a = capacity < 4 ? new long[4] : new long[capacity];
  }

  public void add(long value) {
    if (size == a.length) {
      long[] aa = new long[2 * size];
      System.arraycopy(a, 0, aa, 0, size);
      a = aa;
    }
    a[size++] = value;
  }

  public long get(int idx) {
    if (idx >= size) {
      throw new IndexOutOfBoundsException("list size=" + size + " idx=" + idx);
    }
    return a[idx];
  }

  public int size() {
    return size;
  }

}