/*
 * Copyright (C) 2012, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.internal.storage.file;

import static org.junit.Assert.assertEquals;

import org.eclipse.jgit.internal.storage.file.BasePackBitmapIndex.StoredBitmap;
import org.eclipse.jgit.lib.ObjectId;
import org.junit.Test;

import com.googlecode.javaewah.EWAHCompressedBitmap;

public class StoredBitmapTest {

	@Test
	public void testGetBitmapWithoutXor() {
		EWAHCompressedBitmap b = bitmapOf(100);
		StoredBitmap sb = newStoredBitmap(bitmapOf(100));
		assertEquals(b, sb.getBitmap());
	}

	@Test
	public void testGetBitmapWithOneXor() {
		StoredBitmap sb = newStoredBitmap(bitmapOf(100), bitmapOf(100, 101));
		assertEquals(bitmapOf(101), sb.getBitmap());
	}

	@Test
	public void testGetBitmapWithThreeXor() {
		StoredBitmap sb = newStoredBitmap(
				bitmapOf(100),
				bitmapOf(90, 101),
				bitmapOf(100, 101),
				bitmapOf(50));
		assertEquals(bitmapOf(50, 90), sb.getBitmap());
		assertEquals(bitmapOf(50, 90), sb.getBitmap());
	}

	private static final StoredBitmap newStoredBitmap(
			EWAHCompressedBitmap... bitmaps) {
		StoredBitmap sb = null;
		for (EWAHCompressedBitmap bitmap : bitmaps)
			sb = new StoredBitmap(ObjectId.zeroId(), bitmap, sb, 0);
		return sb;
	}

	private static final EWAHCompressedBitmap bitmapOf(int... bits) {
		EWAHCompressedBitmap b = new EWAHCompressedBitmap();
		for (int bit : bits)
			b.set(bit);
		return b;
	}
}