/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.flink.runtime.operators.util;

import org.apache.flink.core.memory.MemorySegment;
import org.apache.flink.core.memory.MemorySegmentFactory;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class BitSetTest {

	private BitSet bitSet;
	int byteSize = 1024;
	MemorySegment memorySegment = MemorySegmentFactory.allocateUnpooledSegment(byteSize);

	@Before
	public void init() {
		bitSet = new BitSet(byteSize);
		bitSet.setMemorySegment(memorySegment, 0);
		bitSet.clear();
	}

	@Test(expected = IllegalArgumentException.class)
	public void verifyBitSetSize1() {
		bitSet.setMemorySegment(memorySegment, 1);
	}
	
	@Test(expected = IllegalArgumentException.class)
	public void verifyBitSetSize2() {
		bitSet.setMemorySegment(null, 1);
	}
	
	@Test(expected = IllegalArgumentException.class)
	public void verifyBitSetSize3() {
		bitSet.setMemorySegment(memorySegment, -1);
	}

	@Test(expected = IllegalArgumentException.class)
	public void verifyInputIndex1() {
		bitSet.set(8 * byteSize + 1);
	}
	
	@Test(expected = IllegalArgumentException.class)
	public void verifyInputIndex2() {
		bitSet.set(-1);
	}

	@Test
	public void testSetValues() {
		int bitSize = bitSet.bitSize();
		assertEquals(bitSize, 8 * 1024);
		for (int i = 0; i < bitSize; i++) {
			assertFalse(bitSet.get(i));
			if (i % 2 == 0) {
				bitSet.set(i);
			}
		}

		for (int i = 0; i < bitSize; i++) {
			if (i % 2 == 0) {
				assertTrue(bitSet.get(i));
			} else {
				assertFalse(bitSet.get(i));
			}
		}
	}
}