accord-core/src/test/java/accord/utils/RangesTest.java

/*
 * 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 accord.utils;

import accord.primitives.Range;
import accord.impl.IntKey;
import accord.primitives.Ranges;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

public class RangesTest
{
    private static Range r(int start, int end)
    {
        return IntKey.range(start, end);
    }

    private static Ranges ranges(Range... ranges)
    {
        return Ranges.of(ranges);
    }

    @Test
    void rangeIndexForKeyTest()
    {
        Ranges ranges = ranges(r(100, 200), r(300, 400));
        Assertions.assertEquals(-1, ranges.indexOf(IntKey.key(50)));
        Assertions.assertEquals(0, ranges.indexOf(IntKey.key(150)));
        Assertions.assertEquals(-2, ranges.indexOf(IntKey.key(250)));
        Assertions.assertEquals(1, ranges.indexOf(IntKey.key(350)));
        Assertions.assertEquals(-3, ranges.indexOf(IntKey.key(450)));
    }

    @Test
    void differenceTest()
    {
        Assertions.assertEquals(ranges(r(100, 125), r(175, 200)),
                                ranges(r(100, 200)).difference(
                                        ranges(r(125, 175))));
        Assertions.assertEquals(ranges(r(125, 175)),
                                ranges(r(100, 200)).difference(
                                        ranges(r(100, 125), r(175, 200))));
        Assertions.assertEquals(ranges(r(100, 175)),
                                ranges(r(100, 200)).difference(
                                        ranges(r(0, 75), r(175, 200))));
        Assertions.assertEquals(ranges(r(100, 200)),
                                ranges(r(100, 200)).difference(
                                        ranges(r(0, 75), r(200, 205))));

        Assertions.assertEquals(ranges(r(125, 175), r(300, 350)),
                                ranges(r(100, 200), r(250, 350)).difference(
                                        ranges(r(0, 125), r(175, 300))));
        Assertions.assertEquals(ranges(r(125, 200), r(300, 350)),
                                ranges(r(100, 200), r(250, 350)).difference(
                                        ranges(r(0, 125), r(225, 300))));

        Assertions.assertEquals(ranges(r(125, 135), r(140, 160), r(175, 200)),
                                ranges(r(100, 200)).difference(
                                        ranges(r(0, 125), r(135, 140), r(160, 170), r(170, 175))));
    }

    @Test
    void addTest()
    {
        Assertions.assertEquals(ranges(r(0, 50), r(50, 100), r(100, 150), r(150, 200)),
                                ranges(r(0, 50), r(100, 150)).with(ranges(r(50, 100), r(150, 200))));
    }

    private static void assertMergeResult(Ranges expected, Ranges input1, Ranges input2)
    {
        Assertions.assertEquals(expected, input1.with(input2));
        Assertions.assertEquals(expected, input2.with(input1));
    }

    @Test
    void mergeTest()
    {
        assertMergeResult(ranges(r(0, 50), r(100, 350)),
                          ranges(r(100, 250), r(300, 350)),
                          ranges(r(0, 50), r(200, 300), r(310, 315)));
        assertMergeResult(ranges(r(0, 100)),
                          Ranges.EMPTY,
                          ranges(r(0, 100)));
    }

    @Test
    void mergeTouchingTest()
    {
        Assertions.assertEquals(ranges(r(0, 400)), ranges(r(0, 100), r(100, 200), r(200, 300), r(300, 400)).mergeTouching());
        Assertions.assertEquals(ranges(r(0, 200), r(300, 400)), ranges(r(0, 100), r(100, 200), r(300, 400)).mergeTouching());
        Assertions.assertEquals(ranges(r(0, 100), r(200, 400)), ranges(r(0, 100), r(200, 300), r(300, 400)).mergeTouching());
    }

    @Test
    void selectTest()
    {
        Ranges testRanges = ranges(r(0, 100), r(100, 200), r(200, 300), r(300, 400), r(400, 500));
        Assertions.assertEquals(ranges(testRanges.get(1), testRanges.get(3)), testRanges.select(new int[]{1, 3}));
    }
}