| /******************************************************************************* |
| * Copyright (c) 2006 The Pampered Chef 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: |
| * The Pampered Chef - initial API and implementation |
| ******************************************************************************/ |
| |
| package org.eclipse.jface.internal.databinding.internal; |
| |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| /** |
| * Class RandomAccessListIterator. A ListIterator implementation that also |
| * provides access to individual elements based on the element's index. |
| * |
| * @since 3.3 |
| */ |
| public class RandomAccessListIterator implements ListIterator { |
| private ListIterator delegate = null; |
| |
| /** |
| * @param iterator |
| */ |
| public RandomAccessListIterator(ListIterator iterator) { |
| this.delegate = iterator; |
| } |
| |
| /** |
| * @param list |
| */ |
| public RandomAccessListIterator(List list) { |
| if (list == null) { |
| throw new IllegalArgumentException("list is null"); //$NON-NLS-1$ |
| } |
| this.delegate = list.listIterator(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#add(java.lang.Object) |
| */ |
| public void add(Object arg0) { |
| delegate.add(arg0); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#hasNext() |
| */ |
| public boolean hasNext() { |
| return delegate.hasNext(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#hasPrevious() |
| */ |
| public boolean hasPrevious() { |
| return delegate.hasPrevious(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#next() |
| */ |
| public Object next() { |
| return delegate.next(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#nextIndex() |
| */ |
| public int nextIndex() { |
| return delegate.nextIndex(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#previous() |
| */ |
| public Object previous() { |
| return delegate.previous(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#previousIndex() |
| */ |
| public int previousIndex() { |
| return delegate.previousIndex(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#remove() |
| */ |
| public void remove() { |
| delegate.remove(); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.ListIterator#set(java.lang.Object) |
| */ |
| public void set(Object arg0) { |
| delegate.set(arg0); |
| } |
| |
| /** |
| * Return the element at the specified position by moving the iterator |
| * forward or backward in the list until it reaches the correct element. |
| * The iterator's position after returning the element will be one after |
| * the element returned. |
| * |
| * @param index The (0-based) index of the element to return. |
| * @return the Object at index |
| */ |
| public Object get(int index) { |
| if (delegate.nextIndex() == 0 && !delegate.hasNext()) { |
| throw new IndexOutOfBoundsException("Request for element from empty list"); //$NON-NLS-1$ |
| } |
| if (index < 0) { |
| throw new IndexOutOfBoundsException("Request for negative element index"); //$NON-NLS-1$ |
| } |
| |
| while (nextIndex() < index && hasNext()) { |
| next(); |
| } |
| while (previousIndex() > index-1) { |
| previous(); |
| } |
| if (!hasNext()) { |
| throw new IndexOutOfBoundsException("Request for element past end of list"); //$NON-NLS-1$ |
| } |
| return next(); |
| } |
| |
| } |