CircularBufferTest.java

/*******************************************************************************
 * Copyright (c) 2012, 2017 Diamond Light Source Ltd 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
 ******************************************************************************/
package org.eclipse.nebula.visualization.xygraph.dataprovider;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

import org.eclipse.nebula.visualization.xygraph.dataprovider.CircularBuffer;
import org.junit.Test;

public class CircularBufferTest {

	private CircularBuffer<String> circularBuffer;

	@Test
	public void testCircularBuffer() {
		circularBuffer = new CircularBuffer<String>(5);
	}

	@Test
	public void testAdd() {
		circularBuffer = new CircularBuffer<String>(5);
		for (int i = 0; i < 10; i++) {
			circularBuffer.add("e" + i);
			System.out.println(circularBuffer);
		}
		assertArrayEquals(new String[] { "e5", "e6", "e7", "e8", "e9" }, circularBuffer.toArray());
	}

	@Test
	public void testToArray() {
		circularBuffer = new CircularBuffer<String>(5);
		for (int i = 0; i < 10; i++) {
			circularBuffer.add("e" + i);
		}
		assertArrayEquals(new String[] { "e5", "e6", "e7", "e8", "e9" }, circularBuffer.toArray());

	}

	@Test
	public void testClear() {
		circularBuffer = new CircularBuffer<String>(5);
		for (int i = 0; i < 10; i++) {
			circularBuffer.add("e" + i);
		}
		System.out.println(circularBuffer);
		assertArrayEquals(new String[] { "e5", "e6", "e7", "e8", "e9" }, circularBuffer.toArray());
		circularBuffer.clear();
		System.out.println(circularBuffer);
		assertArrayEquals(new String[] {}, circularBuffer.toArray());
	}

	@Test
	public void testSetBufferSize() {
		circularBuffer = new CircularBuffer<String>(5);
		for (int i = 0; i < 2; i++) {
			circularBuffer.add("e" + i);
		}
		System.out.println(circularBuffer);
		// test expand
		circularBuffer.setBufferSize(8, false);
		for (int i = 0; i < 6; i++) {
			circularBuffer.add("e" + (i + 2));
		}
		System.out.println(circularBuffer);
		assertEquals("[e0, e1, e2, e3, e4, e5, e6, e7]", circularBuffer.toString());
		// test shrink
		circularBuffer.setBufferSize(5, false);
		System.out.println(circularBuffer);
		assertEquals("[e3, e4, e5, e6, e7]", circularBuffer.toString());
		// test add
		for (int i = 0; i < 2; i++) {
			circularBuffer.add("e" + i);
		}
		System.out.println(circularBuffer);
		assertEquals("[e5, e6, e7, e0, e1]", circularBuffer.toString());
	}

	@Test
	public void testIterator() {
		circularBuffer = new CircularBuffer<String>(102400);
		for (int i = 0; i < 200000; i++) {
			circularBuffer.add("e" + i);
		}
		int i = 200000 - 102400;
		// System.out.println(circularBuffer);
		for (String s : circularBuffer) {
			assertEquals("e" + i, s);
			i++;
		}
	}

}