Sonar Fixes - type: bugs / severity: critical - mostly div by 0

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1870976 13f79535-47bb-0310-9956-ffa450edef68

src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java

@@ -559,8 +559,8 @@ public class AddDimensionedImage {
 
             // Next, from the columns width, calculate how many co-ordinate
             // positons there are per millimetre
-            coordinatePositionsPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
+            coordinatePositionsPerMM = colWidthMM == 0 ? 0
-                    colWidthMM;
+                : ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS / colWidthMM;
             // From this figure, determine how many co-ordinat positions to
             // inset the left hand or bottom edge of the image.
             inset = (int)(coordinatePositionsPerMM * overlapMM);
@@ -615,8 +615,7 @@ public class AddDimensionedImage {
                 row = sheet.createRow(toRow);
             }
             // Get the row's height in millimetres and add to the running total.
-            rowHeightMM = row.getHeightInPoints() /
+            rowHeightMM = row.getHeightInPoints() / ConvertImageUnits.POINTS_PER_MILLIMETRE;
-                    ConvertImageUnits.POINTS_PER_MILLIMETRE;
             totalRowHeightMM += rowHeightMM;
             toRow++;
         }
@@ -647,11 +646,10 @@ public class AddDimensionedImage {
                 overlapMM = 0.0D;
             }
 
-            rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
+            rowCoordinatesPerMM = rowHeightMM == 0 ? 0
-                    rowHeightMM;
+                : ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS / rowHeightMM;
             inset = (int)(overlapMM * rowCoordinatesPerMM);
-            clientAnchorDetail = new ClientAnchorDetail(startingRow,
+            clientAnchorDetail = new ClientAnchorDetail(startingRow, toRow, inset);
-                        toRow, inset);
         }
         return(clientAnchorDetail);
     }

src/examples/src/org/apache/poi/ss/examples/AddDimensionedImage.java

@@ -460,8 +460,8 @@ public class AddDimensionedImage {
                 // is then instantiated.
                 if(sheet instanceof HSSFSheet) {
                     colWidthMM = reqImageWidthMM;
-                    colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
+                    colCoordinatesPerMM = colWidthMM == 0 ? 0
-                        colWidthMM;
+                        : ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS / colWidthMM;
                     pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM);
 
                 }
@@ -553,8 +553,8 @@ public class AddDimensionedImage {
                         ConvertImageUnits.POINTS_PER_MILLIMETRE));
                 if(sheet instanceof HSSFSheet) {
                     rowHeightMM = reqImageHeightMM;
-                    rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
+                    rowCoordinatesPerMM = rowHeightMM == 0 ? 0
-                        rowHeightMM;
+                        : ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS / rowHeightMM;
                     pictureHeightCoordinates = (int)(reqImageHeightMM *
                             rowCoordinatesPerMM);
                 }

src/examples/src/org/apache/poi/xssf/usermodel/examples/BigGridDemo.java

@@ -78,6 +78,8 @@ import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 public final class BigGridDemo {
     private static final String XML_ENCODING = "UTF-8";
 
+    private static final Random rnd = new Random();
+
     private BigGridDemo() {}
 
     public static void main(String[] args) throws Exception {
@@ -153,7 +155,6 @@ public final class BigGridDemo {
 
     private static void generate(Writer out, Map<String, XSSFCellStyle> styles) throws Exception {
 
-        Random rnd = new Random();
         Calendar calendar = Calendar.getInstance();
 
         SpreadsheetWriter sw = new SpreadsheetWriter(out);

src/excelant/java/org/apache/poi/ss/excelant/ExcelAntEvaluateCell.java

@@ -40,7 +40,6 @@ public class ExcelAntEvaluateCell extends Task {
 	private String cell ;
 	private double expectedValue ;
 	private double precision ;
-	private double precisionToUse ;
 	private double globalPrecision ;
 	private boolean requiredToPass;
 
@@ -98,33 +97,30 @@ public class ExcelAntEvaluateCell extends Task {
 		return expectedValue;
 	}
 
+	@SuppressWarnings("squid:S4275")
 	protected double getPrecision() {
-		return precisionToUse;
-	}
-	
-	@Override
-    public void execute() throws BuildException {
-		
-		precisionToUse = 0 ;
-		
 		// if there is a globalPrecision we will use it unless there is also
 		// precision set at the evaluate level, then we use that.  If there
 		// is not a globalPrecision, we will use the local precision.
 		log( "test precision = " + precision + "\tglobal precision = " + globalPrecision, Project.MSG_VERBOSE ) ;
 		if( globalPrecision > 0 ) {
 			if( precision > 0 ) {
-				precisionToUse = precision ;
 				log( "Using evaluate precision of " + precision + " over the " +
-						  "global precision of " + globalPrecision, Project.MSG_VERBOSE ) ;
+							 "global precision of " + globalPrecision, Project.MSG_VERBOSE ) ;
+				return precision ;
 			} else {
-				precisionToUse = globalPrecision ;
 				log( "Using global precision of " + globalPrecision, Project.MSG_VERBOSE ) ;
+				return globalPrecision ;
 			}
 		} else {
-			precisionToUse = precision ;
 			log( "Using evaluate precision of " + precision, Project.MSG_VERBOSE ) ;
+			return precision ;
 		}
-		result = wbUtil.evaluateCell(cell, expectedValue, precisionToUse ) ;
+	}
+
+	@Override
+    public void execute() throws BuildException {
+		result = wbUtil.evaluateCell(cell, expectedValue, getPrecision() ) ;
 
 		StringBuilder sb = new StringBuilder() ;
 		sb.append( "evaluation of cell " ) ;

src/java/org/apache/poi/sl/draw/geom/Guide.java

@@ -19,16 +19,9 @@
 
 package org.apache.poi.sl.draw.geom;
 
-import static java.lang.Math.abs;
+import static java.lang.Math.*;
-import static java.lang.Math.atan2;
+
-import static java.lang.Math.cos;
+import java.util.regex.Pattern;
-import static java.lang.Math.max;
-import static java.lang.Math.min;
-import static java.lang.Math.sin;
-import static java.lang.Math.sqrt;
-import static java.lang.Math.tan;
-import static java.lang.Math.toDegrees;
-import static java.lang.Math.toRadians;
 
 import org.apache.poi.sl.draw.binding.CTGeomGuide;
 
@@ -40,6 +33,9 @@ public class Guide implements Formula {
         muldiv,addsub,adddiv,ifelse,val,abs,sqrt,max,min,at2,sin,cos,tan,cat2,sat2,pin,mod
     }
 
+    private static final Pattern WHITESPACE = Pattern.compile("\\s+");
+
+    @SuppressWarnings({"FieldCanBeLocal", "unused"})
     private final String name, fmla;
     private final Op op;
     private final String[] operands;
@@ -52,18 +48,20 @@ public class Guide implements Formula {
     public Guide(String nm, String fm){
         name = nm;
         fmla = fm;
-        operands = fm.split("\\s+");
+        operands = WHITESPACE.split(fm);
-        op = Op.valueOf(operands[0].replace("*", "mul").replace("/", "div").replace("+", "add").replace("-", "sub").replace("?:", "ifelse"));
+        switch (operands[0]) {
+            case "*/": op = Op.muldiv; break;
+            case "+-": op = Op.addsub; break;
+            case "+/": op = Op.adddiv; break;
+            case "?:": op = Op.ifelse; break;
+            default: op = Op.valueOf(operands[0]); break;
+        }
     }
 
     public String getName(){
         return name;
     }
 
-    String getFormula(){
-        return fmla;
-    }
-
     @Override
     public double evaluate(Context ctx) {
         double x = (operands.length > 1) ? ctx.getValue(operands[1]) : 0;
@@ -75,7 +73,7 @@ public class Guide implements Formula {
                 return abs(x);
             case adddiv:
                 // Add Divide Formula
-                return (x + y) / z;
+                return (z == 0) ? 0 : (x + y) / z;
             case addsub:
                 // Add Subtract Formula
                 return (x + y) - z;
@@ -87,7 +85,7 @@ public class Guide implements Formula {
                 return x * cos(toRadians(y / OOXML_DEGREE));
             case cat2:
                 // Cosine ArcTan Formula: "cat2 x y z" = (x * cos(arctan(z / y) )) = value of this guide
-                return x*cos(atan2(z, y));
+                return x * cos(atan2(z, y));
             case ifelse:
                 // If Else Formula: "?: x y z" = if (x > 0), then y = value of this guide,
                 // else z = value of this guide
@@ -106,21 +104,15 @@ public class Guide implements Formula {
                 return sqrt(x*x + y*y + z*z);
             case muldiv:
                 // Multiply Divide Formula
-                return (x * y) / z;
+                return (z == 0) ? 0 : (x * y) / z;
             case pin:
                 // Pin To Formula: "pin x y z" = if (y < x), then x = value of this guide
                 // else if (y > z), then z = value of this guide
                 // else y = value of this guide
-                if(y < x) {
+                return max(x, min(y, z));
-                    return x;
-                } else if (y > z) {
-                    return z;
-                } else {
-                    return y;
-                }
             case sat2:
                 // Sine ArcTan Formula: "sat2 x y z" = (x*sin(arctan(z / y))) = value of this guide
-                return x*sin(atan2(z, y));
+                return x * sin(atan2(z, y));
             case sin:
                 // Sine Formula: "sin x y" = (x * sin( y )) = value of this guide
                 return x * sin(toRadians(y / OOXML_DEGREE));

src/java/org/apache/poi/ss/formula/atp/YearFracCalculator.java

@@ -22,6 +22,7 @@ import java.util.Calendar;
 import org.apache.poi.ss.formula.eval.ErrorEval;
 import org.apache.poi.ss.formula.eval.EvaluationException;
 import org.apache.poi.ss.usermodel.DateUtil;
+import org.apache.poi.util.Internal;
 import org.apache.poi.util.LocaleUtil;
 
 
@@ -30,6 +31,7 @@ import org.apache.poi.util.LocaleUtil;
  *
  * Algorithm inspired by www.dwheeler.com/yearfrac
  */
+@Internal
 final class YearFracCalculator {
 	private static final int MS_PER_HOUR = 60 * 60 * 1000;
 	private static final int MS_PER_DAY = 24 * MS_PER_HOUR;
@@ -86,7 +88,7 @@ final class YearFracCalculator {
 	 * @param startDateVal assumed to be less than or equal to endDateVal
 	 * @param endDateVal assumed to be greater than or equal to startDateVal
 	 */
-	public static double basis0(int startDateVal, int endDateVal) {
+	private static double basis0(int startDateVal, int endDateVal) {
 		SimpleDate startDate = createDate(startDateVal);
 		SimpleDate endDate = createDate(endDateVal);
 		int date1day = startDate.day;
@@ -116,12 +118,14 @@ final class YearFracCalculator {
 	 * @param startDateVal assumed to be less than or equal to endDateVal
 	 * @param endDateVal assumed to be greater than or equal to startDateVal
 	 */
-	public static double basis1(int startDateVal, int endDateVal) {
+	private static double basis1(int startDateVal, int endDateVal) {
+		assert(startDateVal <= endDateVal);
 		SimpleDate startDate = createDate(startDateVal);
 		SimpleDate endDate = createDate(endDateVal);
 		double yearLength;
 		if (isGreaterThanOneYear(startDate, endDate)) {
 			yearLength = averageYearLength(startDate.year, endDate.year);
+			assert(yearLength > 0);
 		} else if (shouldCountFeb29(startDate, endDate)) {
 			yearLength = DAYS_PER_LEAP_YEAR;
 		} else {
@@ -134,21 +138,21 @@ final class YearFracCalculator {
 	 * @param startDateVal assumed to be less than or equal to endDateVal
 	 * @param endDateVal assumed to be greater than or equal to startDateVal
 	 */
-	public static double basis2(int startDateVal, int endDateVal) {
+	private static double basis2(int startDateVal, int endDateVal) {
 		return (endDateVal - startDateVal) / 360.0;
 	}
 	/**
 	 * @param startDateVal assumed to be less than or equal to endDateVal
 	 * @param endDateVal assumed to be greater than or equal to startDateVal
 	 */
-	public static double basis3(double startDateVal, double endDateVal) {
+	private static double basis3(double startDateVal, double endDateVal) {
 		return (endDateVal - startDateVal) / 365.0;
 	}
 	/**
 	 * @param startDateVal assumed to be less than or equal to endDateVal
 	 * @param endDateVal assumed to be greater than or equal to startDateVal
 	 */
-	public static double basis4(int startDateVal, int endDateVal) {
+	private static double basis4(int startDateVal, int endDateVal) {
 		SimpleDate startDate = createDate(startDateVal);
 		SimpleDate endDate = createDate(endDateVal);
 		int date1day = startDate.day;
@@ -261,12 +265,10 @@ final class YearFracCalculator {
 	}
 
 	private static double averageYearLength(int startYear, int endYear) {
+		assert(startYear <= endYear);
 		int dayCount = 0;
 		for (int i=startYear; i<=endYear; i++) {
-			dayCount += DAYS_PER_NORMAL_YEAR;
+			dayCount += isLeapYear(i) ? DAYS_PER_LEAP_YEAR : DAYS_PER_NORMAL_YEAR;
-			if (isLeapYear(i)) {
-				dayCount++;
-			}
 		}
 		double numberOfYears = endYear-startYear+1;
 		return dayCount / numberOfYears;
@@ -282,13 +284,11 @@ final class YearFracCalculator {
 			return true;
 		}
 		// all other centuries are *not* leap years
-		if (i % 100 == 0) {
+		return i % 100 != 0;
-			return false;
-		}
-		return true;
 	}
 
 	private static boolean isGreaterThanOneYear(SimpleDate start, SimpleDate end) {
+		assert(start.year <= end.year);
 		if (start.year == end.year) {
 			return false;
 		}
@@ -307,7 +307,7 @@ final class YearFracCalculator {
 	}
 
 	private static SimpleDate createDate(int dayCount) {
-	    /** use UTC time-zone to avoid daylight savings issues */
+	    /* use UTC time-zone to avoid daylight savings issues */
 		Calendar cal = LocaleUtil.getLocaleCalendar(LocaleUtil.TIMEZONE_UTC);
 		DateUtil.setCalendar(cal, dayCount, 0, false, false);
 		return new SimpleDate(cal);

src/java/org/apache/poi/ss/formula/functions/Irr.java

@@ -17,7 +17,10 @@
 
 package org.apache.poi.ss.formula.functions;
 
-import org.apache.poi.ss.formula.eval.*;
+import org.apache.poi.ss.formula.eval.ErrorEval;
+import org.apache.poi.ss.formula.eval.EvaluationException;
+import org.apache.poi.ss.formula.eval.NumberEval;
+import org.apache.poi.ss.formula.eval.ValueEval;
 
 /**
  * Calculates the internal rate of return.
@@ -104,11 +107,17 @@ public final class Irr implements Function {
                 final double value = values[k];
                 fValue += value / denominator;
                 denominator *= factor;
+                if (denominator == 0) {
+                    return Double.NaN;
+                }
                 fDerivative -= k * value / denominator;
             }
 
-            // the essense of the Newton-Raphson Method
+            // the essence of the Newton-Raphson Method
-            x1 = x0 - fValue/fDerivative;
+            if (fDerivative == 0) {
+                return Double.NaN;
+            }
+            x1 =  x0 - fValue/fDerivative;
 
             if (Math.abs(x1 - x0) <= absoluteAccuracy) {
                 return x1;

src/java/org/apache/poi/ss/formula/functions/LinearRegressionFunction.java

@@ -137,7 +137,6 @@ public final class LinearRegressionFunction extends Fixed2ArgFunction {
 			throws EvaluationException {
 
 		// error handling is as if the x is fully evaluated before y
-		ErrorEval firstXerr = null;
 		ErrorEval firstYerr = null;
 		boolean accumlatedSome = false;
         // first pass: read in data, compute xbar and ybar
@@ -147,10 +146,7 @@ public final class LinearRegressionFunction extends Fixed2ArgFunction {
 			ValueEval vx = x.getItem(i);
 			ValueEval vy = y.getItem(i);
 			if (vx instanceof ErrorEval) {
-				if (firstXerr == null) {
+				throw new EvaluationException((ErrorEval) vx);
-					firstXerr = (ErrorEval) vx;
-					continue;
-				}
 			}
 			if (vy instanceof ErrorEval) {
 				if (firstYerr == null) {
@@ -159,16 +155,24 @@ public final class LinearRegressionFunction extends Fixed2ArgFunction {
 				}
 			}
 			// only count pairs if both elements are numbers
+			// all other combinations of value types are silently ignored
 			if (vx instanceof NumberEval && vy instanceof NumberEval) {
 				accumlatedSome = true;
 				NumberEval nx = (NumberEval) vx;
 				NumberEval ny = (NumberEval) vy;
 				sumx  += nx.getNumberValue();
 	            sumy  += ny.getNumberValue();
-			} else {
-				// all other combinations of value types are silently ignored
 			}
 		}
+
+		if (firstYerr != null) {
+			throw new EvaluationException(firstYerr);
+		}
+
+		if (!accumlatedSome) {
+			throw new EvaluationException(ErrorEval.DIV_ZERO);
+		}
+
 		double xbar = sumx / size;
         double ybar = sumy / size;
 
@@ -178,47 +182,24 @@ public final class LinearRegressionFunction extends Fixed2ArgFunction {
 			ValueEval vx = x.getItem(i);
 			ValueEval vy = y.getItem(i);
 
-			if (vx instanceof ErrorEval) {
-				if (firstXerr == null) {
-					firstXerr = (ErrorEval) vx;
-					continue;
-				}
-			}
-			if (vy instanceof ErrorEval) {
-				if (firstYerr == null) {
-					firstYerr = (ErrorEval) vy;
-					continue;
-				}
-			}
-			
 			// only count pairs if both elements are numbers
+			// all other combinations of value types are silently ignored
 			if (vx instanceof NumberEval && vy instanceof NumberEval) {
 				NumberEval nx = (NumberEval) vx;
 				NumberEval ny = (NumberEval) vy;
 	            xxbar += (nx.getNumberValue() - xbar) * (nx.getNumberValue() - xbar);
 	            xybar += (nx.getNumberValue() - xbar) * (ny.getNumberValue() - ybar);
-			} else {
-				// all other combinations of value types are silently ignored
 			}
         }
-        double beta1 = xybar / xxbar;
-        double beta0 = ybar - beta1 * xbar;
 
-		if (firstXerr != null) {
+		if (xxbar == 0 ) {
-			throw new EvaluationException(firstXerr);
-		}
-		if (firstYerr != null) {
-			throw new EvaluationException(firstYerr);
-		}
-		if (!accumlatedSome) {
 			throw new EvaluationException(ErrorEval.DIV_ZERO);
 		}
 
-		if(function == FUNCTION.INTERCEPT) {
+		double beta1 = xybar / xxbar;
-			return beta0;
+		double beta0 = ybar - beta1 * xbar;
-		} else {
+
-			return beta1;
+		return (function == FUNCTION.INTERCEPT) ? beta0 : beta1;
-		}
 	}
 
 	private static ValueVector createValueVector(ValueEval arg) throws EvaluationException {

src/java/org/apache/poi/util/XMLHelper.java

@@ -213,6 +213,7 @@ public final class XMLHelper {
         return XMLEventFactory.newInstance();
     }
 
+    @SuppressWarnings("squid:S4435")
     public static TransformerFactory getTransformerFactory() {
         TransformerFactory factory = TransformerFactory.newInstance();
         trySet(factory::setFeature, FEATURE_SECURE_PROCESSING, true);