tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/databinding/UpdatableCollectionTest.java

package org.eclipse.jface.databinding;

import java.util.ArrayList;
import java.util.List;

import junit.framework.TestCase;

public class UpdatableCollectionTest extends TestCase {

	/*
	 * Test method for 'org.eclipse.jface.databinding.UpdatableCollection.getElements()'
	 */
	public void testGetElementsAndSetElements() {
		TestUpdatableCollection collection = new TestUpdatableCollection();
		String string1 = "string1";
		String string2 = "string2";
		String string3 = "string3";
		String string4 = "string4";
		String string5 = "string5";
		
		collection.addElement(string1, 0);
		collection.addElement(string2, 1);
		
		List elementsToUpdate = new ArrayList();
		elementsToUpdate.add(string3);
		elementsToUpdate.add(string4);
		elementsToUpdate.add(string5);
		
		collection.setElements(elementsToUpdate);
		
		assertEquals("The collection was not updated to the right size.", 3, collection.getSize());
		assertEquals("The wrong element was found in position 0", string3, collection.getElement(0));
		assertEquals("The wrong element was found in position 1", string4, collection.getElement(1));
		assertEquals("The wrong element was found in position 2", string5, collection.getElement(2));
		
		assertNotSame("The all elements list instance should not be the one provided in the set.", elementsToUpdate, collection.getElements());
		
		List returnedList = collection.getElements();
		assertEquals("The wrong element was found in position 0 of the returned list", string3, returnedList.get(0));
		assertEquals("The wrong element was found in position 1 of the returned list", string4, returnedList.get(1));
		assertEquals("The wrong element was found in position 2 of the returned list", string5, returnedList.get(2));
	}

	private class TestUpdatableCollection extends UpdatableCollection {
		private List elements = new ArrayList();
		
		public int addElement(Object value, int index) {
			elements.add(index, value);
			return index;
		}

		public Object computeElement(int index) {
			return elements.get(index);
		}

		public Class getElementType() {
			return Object.class;
		}

		public int computeSize() {
			return elements.size();
		}

		public void removeElement(int index) {
			elements.remove(index);
		}

		public void setElement(int index, Object value) {
			elements.set(index, value);
		}
	}
}