testformulasfromspreadsheet.java

来自「EXCEL read and write」· Java 代码 · 共 311 行

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   this work for additional information regarding copyright ownership.
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   (the "License"); you may not use this file except in compliance with
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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.hssf.record.formula.eval;

import java.io.PrintStream;

import junit.framework.Assert;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.record.formula.functions.TestMathX;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * Tests formulas and operators as loaded from a test data spreadsheet.<p/>
 * This class does not test implementors of <tt>Function</tt> and <tt>OperationEval</tt> in
 * isolation.  Much of the evaluation engine (i.e. <tt>HSSFFormulaEvaluator</tt>, ...) gets
 * exercised as well.  Tests for bug fixes and specific/tricky behaviour can be found in the
 * corresponding test class (<tt>TestXxxx</tt>) of the target (<tt>Xxxx</tt>) implementor, 
 * where execution can be observed more easily.
 * 
 * @author Amol S. Deshmukh &lt; amolweb at ya hoo dot com &gt;
 */
public final class TestFormulasFromSpreadsheet extends TestCase {
	
	private static final class Result {
		public static final int SOME_EVALUATIONS_FAILED = -1;
		public static final int ALL_EVALUATIONS_SUCCEEDED = +1;
		public static final int NO_EVALUATIONS_FOUND = 0;
	}

	/** 
	 * This class defines constants for navigating around the test data spreadsheet used for these tests.
	 */
	private static final class SS {
		
		/**
		 * Name of the test spreadsheet (found in the standard test data folder)
		 */
		public final static String FILENAME = "FormulaEvalTestData.xls";
		/**
		 * Row (zero-based) in the test spreadsheet where the operator examples start.
		 */
		public static final int START_OPERATORS_ROW_INDEX = 22; // Row '23'
		/**
		 * Row (zero-based) in the test spreadsheet where the function examples start.
		 */
		public static final int START_FUNCTIONS_ROW_INDEX = 87; // Row '88' 
		/** 
		 * Index of the column that contains the function names
		 */
		public static final int COLUMN_INDEX_FUNCTION_NAME = 1; // Column 'B'
	
		/**
		 * Used to indicate when there are no more functions left
		 */
		public static final String FUNCTION_NAMES_END_SENTINEL = "<END-OF-FUNCTIONS>";
	
		/**
		 * Index of the column where the test values start (for each function)
		 */
		public static final short COLUMN_INDEX_FIRST_TEST_VALUE = 3; // Column 'D'
		
		/**
		 * Each function takes 4 rows in the test spreadsheet 
		 */
		public static final int NUMBER_OF_ROWS_PER_FUNCTION = 4;
	}

	private HSSFWorkbook workbook;
	private HSSFSheet sheet;
	// Note - multiple failures are aggregated before ending.  
	// If one or more functions fail, a single AssertionFailedError is thrown at the end
	private int _functionFailureCount;
	private int _functionSuccessCount;
	private int _evaluationFailureCount;
	private int _evaluationSuccessCount;

	private static final HSSFCell getExpectedValueCell(HSSFRow row, int columnIndex) {
		if (row == null) {
			return null;
		}
		return row.getCell(columnIndex);
	}


	private static void confirmExpectedResult(String msg, HSSFCell expected, HSSFFormulaEvaluator.CellValue actual) {
		if (expected == null) {
			throw new AssertionFailedError(msg + " - Bad setup data expected value is null");
		}
		if(actual == null) {
			throw new AssertionFailedError(msg + " - actual value was null");
		}
		
		switch (expected.getCellType()) {
			case HSSFCell.CELL_TYPE_BLANK:
				assertEquals(msg, HSSFCell.CELL_TYPE_BLANK, actual.getCellType());
				break;
			case HSSFCell.CELL_TYPE_BOOLEAN:
				assertEquals(msg, HSSFCell.CELL_TYPE_BOOLEAN, actual.getCellType());
				assertEquals(msg, expected.getBooleanCellValue(), actual.getBooleanValue());
				break;
			case HSSFCell.CELL_TYPE_ERROR:
				assertEquals(msg, HSSFCell.CELL_TYPE_ERROR, actual.getCellType());
				assertEquals(msg, ErrorEval.getText(expected.getErrorCellValue()), ErrorEval.getText(actual.getErrorValue()));
				break;
			case HSSFCell.CELL_TYPE_FORMULA: // will never be used, since we will call method after formula evaluation
				throw new AssertionFailedError("Cannot expect formula as result of formula evaluation: " + msg);
			case HSSFCell.CELL_TYPE_NUMERIC:
				assertEquals(msg, HSSFCell.CELL_TYPE_NUMERIC, actual.getCellType());
				TestMathX.assertEquals(msg, expected.getNumericCellValue(), actual.getNumberValue(), TestMathX.POS_ZERO, TestMathX.DIFF_TOLERANCE_FACTOR);
				break;
			case HSSFCell.CELL_TYPE_STRING:
				assertEquals(msg, HSSFCell.CELL_TYPE_STRING, actual.getCellType());
				assertEquals(msg, expected.getRichStringCellValue().getString(), actual.getStringValue());
				break;
		}
	}


	protected void setUp() {
		if (workbook == null) {
			workbook = HSSFTestDataSamples.openSampleWorkbook(SS.FILENAME);
			sheet = workbook.getSheetAt( 0 );
		}
		_functionFailureCount = 0;
		_functionSuccessCount = 0;
		_evaluationFailureCount = 0;
		_evaluationSuccessCount = 0;
	}
	
	public void testFunctionsFromTestSpreadsheet() {
		
		processFunctionGroup(SS.START_OPERATORS_ROW_INDEX, null);
		processFunctionGroup(SS.START_FUNCTIONS_ROW_INDEX, null);
		// example for debugging individual functions/operators:
//		processFunctionGroup(SS.START_OPERATORS_ROW_INDEX, "ConcatEval");
//		processFunctionGroup(SS.START_FUNCTIONS_ROW_INDEX, "AVERAGE");
		
		// confirm results
		String successMsg = "There were " 
				+ _evaluationSuccessCount + " successful evaluation(s) and "
				+ _functionSuccessCount + " function(s) without error";
		if(_functionFailureCount > 0) {
			String msg = _functionFailureCount + " function(s) failed in "
			+ _evaluationFailureCount + " evaluation(s).  " + successMsg;
			throw new AssertionFailedError(msg);
		}
		if(false) { // normally no output for successful tests
			System.out.println(getClass().getName() + ": " + successMsg);
		}
	}

	/**
	 * @param startRowIndex row index in the spreadsheet where the first function/operator is found 
	 * @param testFocusFunctionName name of a single function/operator to test alone. 
	 * Typically pass <code>null</code> to test all functions
	 */
	private void processFunctionGroup(int startRowIndex, String testFocusFunctionName) {

		HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(workbook);

		int rowIndex = startRowIndex;
		while (true) {
			HSSFRow r = sheet.getRow(rowIndex);
			String targetFunctionName = getTargetFunctionName(r);
			if(targetFunctionName == null) {
				throw new AssertionFailedError("Test spreadsheet cell empty on row (" 
						+ (rowIndex+1) + "). Expected function name or '"
						+ SS.FUNCTION_NAMES_END_SENTINEL + "'");
			}
			if(targetFunctionName.equals(SS.FUNCTION_NAMES_END_SENTINEL)) {
				// found end of functions list
				break;
			}
			if(testFocusFunctionName == null || targetFunctionName.equalsIgnoreCase(testFocusFunctionName)) {
				
				// expected results are on the row below
				HSSFRow expectedValuesRow = sheet.getRow(rowIndex + 1);
				if(expectedValuesRow == null) {
					int missingRowNum = rowIndex + 2; //+1 for 1-based, +1 for next row
					throw new AssertionFailedError("Missing expected values row for function '" 
							+ targetFunctionName + " (row " + missingRowNum + ")"); 
				}
				switch(processFunctionRow(evaluator, targetFunctionName, r, expectedValuesRow)) {
					case Result.ALL_EVALUATIONS_SUCCEEDED: _functionSuccessCount++; break;
					case Result.SOME_EVALUATIONS_FAILED: _functionFailureCount++; break;
					default:
						throw new RuntimeException("unexpected result");
					case Result.NO_EVALUATIONS_FOUND: // do nothing
				}
			}
			rowIndex += SS.NUMBER_OF_ROWS_PER_FUNCTION;
		}
	}

	/**
	 * 
	 * @return a constant from the local Result class denoting whether there were any evaluation
	 * cases, and whether they all succeeded.
	 */
	private int processFunctionRow(HSSFFormulaEvaluator evaluator, String targetFunctionName, 
			HSSFRow formulasRow, HSSFRow expectedValuesRow) {
		
		int result = Result.NO_EVALUATIONS_FOUND; // so far
		short endcolnum = formulasRow.getLastCellNum();

		// iterate across the row for all the evaluation cases
		for (int colnum=SS.COLUMN_INDEX_FIRST_TEST_VALUE; colnum < endcolnum; colnum++) {
			HSSFCell c = formulasRow.getCell(colnum);
			if (c == null || c.getCellType() != HSSFCell.CELL_TYPE_FORMULA) {
				continue;
			}

			HSSFFormulaEvaluator.CellValue actualValue = evaluator.evaluate(c);

			HSSFCell expectedValueCell = getExpectedValueCell(expectedValuesRow, colnum);
			try {
				confirmExpectedResult("Function '" + targetFunctionName + "': Formula: " + c.getCellFormula() + " @ " + formulasRow.getRowNum() + ":" + colnum,
						expectedValueCell, actualValue);
				_evaluationSuccessCount ++;
				if(result != Result.SOME_EVALUATIONS_FAILED) {
					result = Result.ALL_EVALUATIONS_SUCCEEDED;
				}
			} catch (AssertionFailedError e) {
				_evaluationFailureCount ++;
				printShortStackTrace(System.err, e);
				result = Result.SOME_EVALUATIONS_FAILED;
			}
		}
		return result;
	}

	/**
	 * Useful to keep output concise when expecting many failures to be reported by this test case
	 */
	private static void printShortStackTrace(PrintStream ps, AssertionFailedError e) {
		StackTraceElement[] stes = e.getStackTrace();
		
		int startIx = 0;
		// skip any top frames inside junit.framework.Assert
		while(startIx<stes.length) {
			if(!stes[startIx].getClassName().equals(Assert.class.getName())) {
				break;
			}
			startIx++;
		}
		// skip bottom frames (part of junit framework)
		int endIx = startIx+1;
		while(endIx < stes.length) {
			if(stes[endIx].getClassName().equals(TestCase.class.getName())) {
				break;
			}
			endIx++;
		}
		if(startIx >= endIx) {
			// something went wrong. just print the whole stack trace
			e.printStackTrace(ps);
		}
		endIx -= 4; // skip 4 frames of reflection invocation
		ps.println(e.toString());
		for(int i=startIx; i<endIx; i++) {
			ps.println("\tat " + stes[i].toString());
		}
	}

	/**
	 * @return <code>null</code> if cell is missing, empty or blank
	 */
	private static String getTargetFunctionName(HSSFRow r) {
		if(r == null) {
			System.err.println("Warning - given null row, can't figure out function name");
			return null;
		}
		HSSFCell cell = r.getCell(SS.COLUMN_INDEX_FUNCTION_NAME);
		if(cell == null) {
			System.err.println("Warning - Row " + r.getRowNum() + " has no cell " + SS.COLUMN_INDEX_FUNCTION_NAME + ", can't figure out function name");
			return null;
		}
		if(cell.getCellType() == HSSFCell.CELL_TYPE_BLANK) {
			return null;
		}
		if(cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
			return cell.getRichStringCellValue().getString();
		}
		
		throw new AssertionFailedError("Bad cell type for 'function name' column: ("
				+ cell.getCellType() + ") row (" + (r.getRowNum() +1) + ")");
	}
}