BitMapTest.java

/**
 * Copyright 2014 Alexey Ragozin
 *
 * Licensed 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.gridkit.jvmtool.util;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.Assert;
import org.junit.Test;

public class BitMapTest {

    @Test
    public void simple_test() {
        PagedBitMap pbm = new PagedBitMap();
        int len = 4 << 20;
        for(int i = 0; i != len; ++i) {
            pbm.set(3 * i, true);
        }

        for(int i = 0; i != len; ++i) {
            Assert.assertTrue(pbm.get(3 * i));
            Assert.assertFalse(pbm.get(3 * i + 1));
            Assert.assertFalse(pbm.get(3 * i + 2));
        }

        for(int i = len; i != 2 * len; ++i) {
            Assert.assertFalse(pbm.get(3 * i));
            Assert.assertFalse(pbm.get(3 * i + 1));
            Assert.assertFalse(pbm.get(3 * i + 2));
        }

        long n = 0;
        while(true) {
            if (n == 31) {
                new String();
            }
            long m = pbm.seekOne(n);
            if (m < 0) {
                Assert.assertTrue(n == 3 * len - 2);
                break;
            }
            if (m == n) {
                Assert.assertTrue(n == 0);
            }
            else {
                Assert.assertTrue(m == n + 2);
            }
            n = m + 1;
        }

        for(int i = 0; i != len; ++i) {
            pbm.set(1000l * len + 3 * i, true);
        }

        for(int i = 0; i != len; ++i) {
            Assert.assertTrue(pbm.get(1000l * len + 3 * i));
            Assert.assertFalse(pbm.get(1000l * len + 3 * i + 1));
            Assert.assertFalse(pbm.get(1000l * len + 3 * i + 2));
        }
    }

    @Test
    public void delete_test() {
        PagedBitMap pbm = new PagedBitMap();
        pbm.set(20, true);
        pbm.set(40, true);
        pbm.set(60, true);
        pbm.set(80, true);
        pbm.set(100, true);
        assertThat(pbm.get(20)).isTrue();
        assertThat(pbm.get(40)).isTrue();
        assertThat(pbm.get(60)).isTrue();
        assertThat(pbm.get(80)).isTrue();
        assertThat(pbm.get(100)).isTrue();
        pbm.set(40, false);
        assertThat(pbm.get(20)).isTrue();
        assertThat(pbm.get(40)).isFalse();
        assertThat(pbm.get(60)).isTrue();
        assertThat(pbm.get(80)).isTrue();
        assertThat(pbm.get(100)).isTrue();

        assertThat(pbm.seekOne(0)).isEqualTo(20);
        assertThat(pbm.seekOne(21)).isEqualTo(60);
        assertThat(pbm.seekOne(41)).isEqualTo(60);
        assertThat(pbm.seekOne(61)).isEqualTo(80);
        assertThat(pbm.seekOne(81)).isEqualTo(100);
        assertThat(pbm.seekOne(101)).isEqualTo(-1);

        assertThat(pbm.getAndSet(60, false)).isTrue();
        assertThat(pbm.getAndSet(40, true)).isFalse();
        assertThat(pbm.get(40)).isTrue();
        assertThat(pbm.get(60)).isFalse();
    }

}