poi/src/test/java/org/apache/poi/ss/formula/ptg/TestArrayPtg.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.ptg;

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

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.record.TestcaseRecordInputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.util.LittleEndianByteArrayOutputStream;
import org.apache.poi.util.LittleEndianInput;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@code ArrayPtg}
 */
final class TestArrayPtg {

	private static final byte[] ENCODED_PTG_DATA = {
		0x40,
		0, 0, 0, 0, 0, 0, 0,
	};
	private static final byte[] ENCODED_CONSTANT_DATA = {
		2,    // 3 columns
		1, 0, // 2 rows
		4, 1, 0, 0, 0, 0, 0, 0, 0, // TRUE
		2, 4, 0, 0, 65, 66, 67, 68, // "ABCD"
		2, 1, 0, 0, 69, // "E"
		1, 0, 0, 0, 0, 0, 0, 0, 0, // 0
		4, 0, 0, 0, 0, 0, 0, 0, 0, // FALSE
		2, 2, 0, 0, 70, 71, // "FG"
	};

	private static ArrayPtg create(byte[] initialData, byte[] constantData) {
		ArrayInitialPtg ptgInit = new ArrayInitialPtg(TestcaseRecordInputStream.createLittleEndian(initialData));
		return ptgInit.finishReading(TestcaseRecordInputStream.createLittleEndian(constantData));
	}

	/**
	 * Lots of problems with ArrayPtg's decoding and encoding of the element value data
	 */
	@Test
	void testReadWriteTokenValueBytes() {
		ArrayPtg ptg = create(ENCODED_PTG_DATA, ENCODED_CONSTANT_DATA);
		assertEquals(3, ptg.getColumnCount());
		assertEquals(2, ptg.getRowCount());
		Object[][] values = ptg.getTokenArrayValues();
		assertEquals(2, values.length);


		assertEquals(Boolean.TRUE, values[0][0]);
		assertEquals("ABCD", values[0][1]);
		assertEquals(0d, values[1][0]);
		assertEquals(Boolean.FALSE, values[1][1]);
		assertEquals("FG", values[1][2]);

		byte[] outBuf = new byte[ENCODED_CONSTANT_DATA.length];
		ptg.writeTokenValueBytes(new LittleEndianByteArrayOutputStream(outBuf, 0));

		assertNotEquals(4, outBuf[0], "Identified bug 42564b");
		assertArrayEquals(ENCODED_CONSTANT_DATA, outBuf);
	}


	/**
	 * Excel stores array elements column by column.  This test makes sure POI does the same.
	 */
	@Test
	void testElementOrdering() {
		ArrayPtg ptg = create(ENCODED_PTG_DATA, ENCODED_CONSTANT_DATA);
		assertEquals(3, ptg.getColumnCount());
		assertEquals(2, ptg.getRowCount());

		assertEquals(0, ptg.getValueIndex(0, 0));
		assertEquals(1, ptg.getValueIndex(1, 0));
		assertEquals(2, ptg.getValueIndex(2, 0));
		assertEquals(3, ptg.getValueIndex(0, 1));
		assertEquals(4, ptg.getValueIndex(1, 1));
		assertEquals(5, ptg.getValueIndex(2, 1));
	}

	/**
	 * Test for a bug which was temporarily introduced by the fix for bug 42564.
	 * A spreadsheet was added to make the ordering clearer.
	 */
	@Test
	void testElementOrderingInSpreadsheet() {
		HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("ex42564-elementOrder.xls");

		// The formula has an array with 3 rows and 5 columns
		String formula = wb.getSheetAt(0).getRow(0).getCell(0).getCellFormula();

		assertNotEquals("Identified bug 42564 b", "SUM({1,6,11;2,7,12;3,8,13;4,9,14;5,10,15})", formula);
		assertEquals("SUM({1,2,3,4,5;6,7,8,9,10;11,12,13,14,15})", formula);
	}

	@Test
	void testToFormulaString() {
		ArrayPtg ptg = create(ENCODED_PTG_DATA, ENCODED_CONSTANT_DATA);
		// bug 45380 - Unexpected constant class (java.lang.Boolean)
		String actualFormula = ptg.toFormulaString();
		assertEquals("{TRUE,\"ABCD\",\"E\";0,FALSE,\"FG\"}", actualFormula);
	}

	/**
	 * worth checking since AttrPtg.sid=0x20 and Ptg.CLASS_* = (0x00, 0x20, and 0x40)
	 */
	@Test
	void testOperandClassDecoding() {
		confirmOperandClassDecoding(Ptg.CLASS_REF);
		confirmOperandClassDecoding(Ptg.CLASS_VALUE);
		confirmOperandClassDecoding(Ptg.CLASS_ARRAY);
	}

	private static void confirmOperandClassDecoding(byte operandClass) {
		byte[] fullData = concat(ENCODED_PTG_DATA, ENCODED_CONSTANT_DATA);

		// Force encoded operand class for tArray
		fullData[0] = (byte) (ArrayPtg.sid + operandClass);

		LittleEndianInput in = TestcaseRecordInputStream.createLittleEndian(fullData);

		Ptg[] ptgs = Ptg.readTokens(ENCODED_PTG_DATA.length, in);
		assertEquals(1, ptgs.length);
		ArrayPtg aPtg = (ArrayPtg) ptgs[0];
		assertEquals(operandClass, aPtg.getPtgClass());
	}

	private static byte[] concat(byte[] a, byte[] b) {
		byte[] result = new byte[a.length + b.length];
		System.arraycopy(a, 0, result, 0, a.length);
		System.arraycopy(b, 0, result, a.length, b.length);
		return result;
	}
}