log4j/src/testcases/org/apache/poi/ss/util/TestCellRangeUtil.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.ss.util;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.junit.jupiter.api.Test;

/**
 * Tests CellRangeUtil.
 *
 * @see org.apache.poi.ss.util.CellRangeUtil
 */
final class TestCellRangeUtil {

    private static final CellRangeAddress A1 = new CellRangeAddress(0, 0, 0, 0);
    private static final CellRangeAddress B1 = new CellRangeAddress(0, 0, 1, 1);
    private static final CellRangeAddress A2 = new CellRangeAddress(1, 1, 0, 0);
    private static final CellRangeAddress B2 = new CellRangeAddress(1, 1, 1, 1);
    private static final CellRangeAddress A1_B2 = new CellRangeAddress(0, 1, 0, 1);
    private static final CellRangeAddress A1_B1 = new CellRangeAddress(0, 0, 0, 1);
    private static final CellRangeAddress A1_A2 = new CellRangeAddress(0, 1, 0, 0);

    @Test
    void testMergeCellRanges() {
        // Note that the order of the output array elements does not matter
        // And that there may be more than one valid outputs for a given input. Any valid output is accepted.
        // POI should use a strategy that is consistent and predictable (it currently is not).

        // Fully mergeable
        //    A B
        //  1 x x   A1,A2,B1,B2 --> A1:B2
        //  2 x x
        assertCellRangesEqual(asArray(A1_B2), merge(A1, B1, A2, B2));
        assertCellRangesEqual(asArray(A1_B2), merge(A1, B2, A2, B1));

        // Partially mergeable: multiple possible merges
        //    A B
        //  1 x x   A1,A2,B1 --> A1:B1,A2 or A1:A2,B1
        //  2 x
        assertCellRangesEqual(asArray(A1_B1, A2), merge(A1, B1, A2));
        assertCellRangesEqual(asArray(A1_A2, B1), merge(A2, A1, B1));
        assertCellRangesEqual(asArray(A1_B1, A2), merge(B1, A2, A1));

        // Not mergeable
        //    A B
        //  1 x     A1,B2 --> A1,B2
        //  2   x
        assertCellRangesEqual(asArray(A1, B2), merge(A1, B2));
        assertCellRangesEqual(asArray(B2, A1), merge(B2, A1));
    }

    private void assertCellRangesEqual(CellRangeAddress[] a, CellRangeAddress[] b) {
        assertEquals(getCellAddresses(a), getCellAddresses(b));
        assertArrayEquals(a, b);
    }

    private static Set<CellAddress> getCellAddresses(CellRangeAddress[] ranges) {
        final Set<CellAddress> set = new HashSet<>();
        for (final CellRangeAddress range : ranges) {
            for (Iterator<CellAddress> iter = range.iterator(); iter.hasNext(); ) {
                set.add(iter.next());
            }
        }
        return set;
    }

    private static CellRangeAddress[] asArray(CellRangeAddress...ts) {
        return ts;
    }

    private static CellRangeAddress[] merge(CellRangeAddress... ranges) {
        return CellRangeUtil.mergeCellRanges(ranges);
    }
}