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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper (Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.collection;
/**
* @author Eike Stepper
* @since 2.0
*/
public class DynamicArray<E>
{
private Object[] elements;
public DynamicArray()
{
}
public int add(E element)
{
int length = elements.length;
for (int i = 0; i < length; i++)
{
if (elements[i] == null)
{
elements[i] = element;
return i;
}
}
grow(length);
elements[length] = element;
return length;
}
@SuppressWarnings("unchecked")
public E add(int index, E element)
{
grow(index);
Object old = elements[index];
elements[index] = element;
return (E)old;
}
@SuppressWarnings("unchecked")
public E remove(int index)
{
Object old = elements[index];
if (old != null)
{
elements[index] = null;
shrink();
}
return (E)old;
}
@SuppressWarnings("unchecked")
public E get(int index)
{
return (E)elements[index];
}
private void grow(int index)
{
if (index >= elements.length)
{
Object[] newChannels = new Object[index + 1];
System.arraycopy(elements, 0, newChannels, 0, elements.length);
elements = newChannels;
}
}
private void shrink()
{
boolean shrink = false;
int lastIndex = elements.length - 1;
while (lastIndex > 0 && (shrink = elements[lastIndex] == null))
{
--lastIndex;
}
if (shrink)
{
int newLength = lastIndex + 1;
Object[] newChannels = new Object[newLength];
System.arraycopy(elements, 0, newChannels, 0, newLength);
elements = newChannels;
}
}
}
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