How to use

positiveIndexCheck

method

in

us.ihmc.robotics.lists.RecyclingArrayList

/**
* Checks if the given index is in range.  If not, throws an appropriate
* runtime exception.  This method does *not* check if the index is
* negative: It is always used immediately prior to an array access,
* which throws an ArrayIndexOutOfBoundsException if index is negative.
*/
protected void rangeCheck(int index)
{
 if (index >= size)
   throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
 positiveIndexCheck(index);
}

protected void rangeCheckForInsert(int index)
{
 if (index > size)
   throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
 positiveIndexCheck(index);
}

/**
* Returns the element at the specified position in this list.
* The list will grow if the given index is greater or equal to
* the size this list.
*
* @param  index index of the element to return
* @return the element at the specified position in this list
* @throws IndexOutOfBoundsException if the index is negative (<tt>index &lt; 0</tt>)
*/
public T getAndGrowIfNeeded(int index)
{
 positiveIndexCheck(index);
 if (index >= size)
 {
   size = index + 1;
   ensureCapacity(size);
 }
 return elementData[index];
}