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;
  }

}