net.myrrix.common.collection.FastIDSetTest.java Source code

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Here is the source code for net.myrrix.common.collection.FastIDSetTest.java

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/**
 * 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 net.myrrix.common.collection;

import org.apache.commons.math3.random.RandomGenerator;
import org.apache.mahout.cf.taste.impl.common.LongPrimitiveIterator;
import org.junit.Test;

import java.util.Collection;
import java.util.HashSet;

import net.myrrix.common.MyrrixTest;
import net.myrrix.common.random.RandomManager;

/** <p>Tests {@link FastIDSet}.</p> */
public final class FastIDSetTest extends MyrrixTest {

    @Test
    public void testContainsAndAdd() {
        FastIDSet set = new FastIDSet();
        assertFalse(set.contains(1));
        set.add(1);
        assertTrue(set.contains(1));
    }

    @Test
    public void testRemove() {
        FastIDSet set = new FastIDSet();
        set.add(1);
        set.remove(1);
        assertEquals(0, set.size());
        assertTrue(set.isEmpty());
        assertFalse(set.contains(1));
    }

    @Test
    public void testClear() {
        FastIDSet set = new FastIDSet();
        set.add(1);
        set.clear();
        assertEquals(0, set.size());
        assertTrue(set.isEmpty());
        assertFalse(set.contains(1));
    }

    @Test
    public void testSizeEmpty() {
        FastIDSet set = new FastIDSet();
        assertEquals(0, set.size());
        assertTrue(set.isEmpty());
        set.add(1);
        assertEquals(1, set.size());
        assertFalse(set.isEmpty());
        set.remove(1);
        assertEquals(0, set.size());
        assertTrue(set.isEmpty());
    }

    @Test
    public void testContains() {
        FastIDSet set = buildTestFastSet();
        assertTrue(set.contains(1));
        assertTrue(set.contains(2));
        assertTrue(set.contains(3));
        assertFalse(set.contains(4));
    }

    @Test
    public void testReservedValues() {
        FastIDSet set = new FastIDSet();
        try {
            set.add(Long.MIN_VALUE);
            fail("Should have thrown IllegalArgumentException");
        } catch (IllegalArgumentException iae) {
            // good
        }
        assertFalse(set.contains(Long.MIN_VALUE));
        try {
            set.add(Long.MAX_VALUE);
            fail("Should have thrown IllegalArgumentException");
        } catch (IllegalArgumentException iae) {
            // good
        }
        assertFalse(set.contains(Long.MAX_VALUE));
    }

    @Test
    public void testRehash() {
        FastIDSet set = buildTestFastSet();
        set.remove(1);
        set.rehash();
        assertFalse(set.contains(1));
    }

    @Test
    public void testGrow() {
        FastIDSet set = new FastIDSet(1);
        set.add(1);
        set.add(2);
        assertTrue(set.contains(1));
        assertTrue(set.contains(2));
    }

    @Test
    public void testIterator() {
        FastIDSet set = buildTestFastSet();
        Collection<Long> expected = new HashSet<Long>(3);
        expected.add(1L);
        expected.add(2L);
        expected.add(3L);
        LongPrimitiveIterator it = set.iterator();
        while (it.hasNext()) {
            expected.remove(it.nextLong());
        }
        assertTrue(expected.isEmpty());
    }

    @Test
    public void testVersusHashSet() {
        FastIDSet actual = new FastIDSet(1);
        Collection<Integer> expected = new HashSet<Integer>(1000000);
        RandomGenerator r = RandomManager.getRandom();
        for (int i = 0; i < 1000000; i++) {
            double d = r.nextDouble();
            Integer key = r.nextInt(100);
            if (d < 0.4) {
                assertEquals(expected.contains(key), actual.contains(key));
            } else {
                if (d < 0.7) {
                    assertEquals(expected.add(key), actual.add(key));
                } else {
                    assertEquals(expected.remove(key), actual.remove(key));
                }
                assertEquals(expected.size(), actual.size());
                assertEquals(expected.isEmpty(), actual.isEmpty());
            }
        }
    }

    private static FastIDSet buildTestFastSet() {
        FastIDSet set = new FastIDSet();
        set.add(1);
        set.add(2);
        set.add(3);
        return set;
    }

}