Commons Math example source code file (RandomKeyTest.java)

This example Commons Math source code file (RandomKeyTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Math tags/keywords

comparator, double, double, dummyrandomkey, dummyrandomkey, illegalargumentexception, list, list, randomkeytest, string, string, test, uncaught, util

The Commons Math RandomKeyTest.java source code

/*
 * 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.commons.math.genetics;

import static org.junit.Assert.*;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

import org.junit.Test;

public class RandomKeyTest {

    @Test(expected=IllegalArgumentException.class)
    public void testConstructor1() {
        new DummyRandomKey(new Double[] {0.2, 0.3, 1.2});
    }

    @Test(expected=IllegalArgumentException.class)
    public void testConstructor2() {
        new DummyRandomKey(new Double[] {0.2, 0.3, -0.2});
    }

    @Test
    public void testIsSame() {
        DummyRandomKey drk1 = new DummyRandomKey(new Double[] {0.4, 0.1, 0.5, 0.8, 0.2});
        DummyRandomKey drk2 = new DummyRandomKey(new Double[] {0.4, 0.1, 0.5, 0.8, 0.2});
        DummyRandomKey drk3 = new DummyRandomKey(new Double[] {0.4, 0.15, 0.5, 0.8, 0.2});
        DummyRandomKey drk4 = new DummyRandomKey(new Double[] {0.4, 0.25, 0.5, 0.8, 0.2});
        DummyRandomKey drk5 = new DummyRandomKey(new Double[] {0.4, 0.25, 0.5, 0.8, 0.2, 0.5});

        assertTrue(drk1.isSame(drk2));
        assertTrue(drk2.isSame(drk3));
        assertFalse(drk3.isSame(drk4));
        assertFalse(drk4.isSame(drk5));
    }

    @Test
    public void testDecode() {
        DummyRandomKey drk = new DummyRandomKey(new Double[] {0.4, 0.1, 0.5, 0.8, 0.2});
        List<String> decoded = drk.decode(Arrays.asList(new String[] {"a", "b", "c", "d", "e"}));

        assertEquals("b", decoded.get(0));
        assertEquals("e", decoded.get(1));
        assertEquals("a", decoded.get(2));
        assertEquals("c", decoded.get(3));
        assertEquals("d", decoded.get(4));
    }

    @Test
    public void testRandomPermutation() {
        // never generate an invalid one
        for (int i=0; i<10; i++) {
            DummyRandomKey drk = new DummyRandomKey(RandomKey.randomPermutation(20));
            assertNotNull(drk);
        }
    }

    @Test
    public void testIdentityPermutation() {
        DummyRandomKey drk = new DummyRandomKey(RandomKey.identityPermutation(5));
        List<String> decoded = drk.decode(Arrays.asList(new String[] {"a", "b", "c", "d", "e"}));

        assertEquals("a", decoded.get(0));
        assertEquals("b", decoded.get(1));
        assertEquals("c", decoded.get(2));
        assertEquals("d", decoded.get(3));
        assertEquals("e", decoded.get(4));
    }

    @Test
    public void testComparatorPermutation() {
        List<String> data = Arrays.asList(new String[] {"x", "b", "c", "z", "b"});

        List<Double> permutation = RandomKey.comparatorPermutation(data, new Comparator() {
            public int compare(String o1, String o2) {
                return o1.compareTo(o2);
            }
        });
        Double[] permArr = new Double[data.size()];
        permArr = permutation.toArray(permArr);
        assertArrayEquals(new Double[] {0.6,0.0,0.4,0.8,0.2}, permArr);
        List<String> decodedData = new DummyRandomKey(permutation).decode(data);
        assertEquals("b", decodedData.get(0));
        assertEquals("b", decodedData.get(1));
        assertEquals("c", decodedData.get(2));
        assertEquals("x", decodedData.get(3));
        assertEquals("z", decodedData.get(4));

        permutation = RandomKey.comparatorPermutation(data, new Comparator<String>() {
            public int compare(String o1, String o2) {
                return o2.compareTo(o1);
            }
        });
        permArr = new Double[data.size()];
        permArr = permutation.toArray(permArr);
        assertArrayEquals(new Double[] {0.2,0.6,0.4,0.0,0.8}, permArr);
        decodedData = new DummyRandomKey(permutation).decode(data);
        assertEquals("z", decodedData.get(0));
        assertEquals("x", decodedData.get(1));
        assertEquals("c", decodedData.get(2));
        assertEquals("b", decodedData.get(3));
        assertEquals("b", decodedData.get(4));
    }

    @Test
    public void testInducedPermutation() {
        List<String> origData = Arrays.asList(new String[] {"a", "b", "c", "d", "d"});
        List<String> permutedData = Arrays.asList(new String[] {"d", "b", "c", "a", "d"});

        DummyRandomKey drk = new DummyRandomKey(RandomKey.inducedPermutation(origData, permutedData));
        List<String> decoded = drk.decode(origData);

        assertEquals("d", decoded.get(0));
        assertEquals("b", decoded.get(1));
        assertEquals("c", decoded.get(2));
        assertEquals("a", decoded.get(3));
        assertEquals("d", decoded.get(4));

        try {
            RandomKey.inducedPermutation(
                    Arrays.asList(new String[] {"a", "b", "c", "d", "d"}),
                    Arrays.asList(new String[] {"a", "b", "c", "d"})
            );
            fail("Uncaught exception");
        } catch (IllegalArgumentException e) {
            // no-op
        }
        try {
            RandomKey.inducedPermutation(
                    Arrays.asList(new String[] {"a", "b", "c", "d", "d"}),
                    Arrays.asList(new String[] {"a", "b", "c", "d", "f"})
            );
            fail("Uncaught exception");
        } catch (IllegalArgumentException e) {
            // no-op
        }
    }

    @Test
    public void testEqualRepr() {
        DummyRandomKey drk = new DummyRandomKey(new Double[] {0.2, 0.2, 0.5});
        List<String> decodedData = drk.decode(Arrays.asList(new String[] {"a", "b", "c"}));
        assertEquals("a", decodedData.get(0));
        assertEquals("b", decodedData.get(1));
        assertEquals("c", decodedData.get(2));
    }

}