From b7c061f07a60267c0d711bbe0aadfc26d16a842a Mon Sep 17 00:00:00 2001
From: Nick Burch <nick@apache.org>
Date: Thu, 10 Jan 2013 15:08:22 +0000
Subject: [PATCH] Patch from Johan from bug #54402 - fix IfError with indirect
 references

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1431403 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/poi/ss/formula/atp/IfError.java    |  8 +++++---
 .../apache/poi/ss/formula/atp/TestIfError.java    | 15 +++++++++++++--
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/java/org/apache/poi/ss/formula/atp/IfError.java b/src/java/org/apache/poi/ss/formula/atp/IfError.java
index 5b7e21b8d..d3a22661b 100644
--- a/src/java/org/apache/poi/ss/formula/atp/IfError.java
+++ b/src/java/org/apache/poi/ss/formula/atp/IfError.java
@@ -18,6 +18,7 @@
 package org.apache.poi.ss.formula.atp;
 
 import org.apache.poi.ss.formula.OperationEvaluationContext;
+import org.apache.poi.ss.formula.WorkbookEvaluator;
 import org.apache.poi.ss.formula.eval.ErrorEval;
 import org.apache.poi.ss.formula.eval.EvaluationException;
 import org.apache.poi.ss.formula.eval.ValueEval;
@@ -47,7 +48,7 @@ final class IfError implements FreeRefFunction {
 
 		ValueEval val;
 		try {
-			val = evaluateArgParity(args[0], args[1], ec.getRowIndex(), ec.getColumnIndex());
+			val = evaluateInternal(args[0], args[1], ec.getRowIndex(), ec.getColumnIndex());
 		} catch (EvaluationException e) {
 			return e.getErrorEval();
 		}
@@ -55,11 +56,12 @@ final class IfError implements FreeRefFunction {
 		return val;
 	}
 
-	private static ValueEval evaluateArgParity(ValueEval arg, ValueEval iferror, int srcCellRow, int srcCellCol) throws EvaluationException {
+	private static ValueEval evaluateInternal(ValueEval arg, ValueEval iferror, int srcCellRow, int srcCellCol) throws EvaluationException {
+		arg = WorkbookEvaluator.dereferenceResult(arg, srcCellRow, srcCellCol);
 		if(arg instanceof ErrorEval) {
 			return iferror;
 		} else {
 			return arg;
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/src/testcases/org/apache/poi/ss/formula/atp/TestIfError.java b/src/testcases/org/apache/poi/ss/formula/atp/TestIfError.java
index bcaafda50..7a70fee26 100644
--- a/src/testcases/org/apache/poi/ss/formula/atp/TestIfError.java
+++ b/src/testcases/org/apache/poi/ss/formula/atp/TestIfError.java
@@ -36,6 +36,7 @@ public class TestIfError extends TestCase {
     /**
      * =IFERROR(210/35,\"Error in calculation\")"  Divides 210 by 35 and returns 6.0
      * =IFERROR(55/0,\"Error in calculation\")"    Divides 55 by 0 and returns the error text
+     * =IFERROR(C1,\"Error in calculation\")"      References the result of dividing 55 by 0 and returns the error text
      */
     public static void testEvaluate(){
         Workbook wb = new HSSFWorkbook();
@@ -46,6 +47,7 @@ public class TestIfError extends TestCase {
         // Create cells
         row1.createCell(0, Cell.CELL_TYPE_NUMERIC);
         row1.createCell(1, Cell.CELL_TYPE_NUMERIC);
+        row1.createCell(2, Cell.CELL_TYPE_NUMERIC);
         row2.createCell(0, Cell.CELL_TYPE_NUMERIC);
         row2.createCell(1, Cell.CELL_TYPE_NUMERIC);
 
@@ -54,18 +56,22 @@ public class TestIfError extends TestCase {
         CellReference a2 = new CellReference("A2");
         CellReference b1 = new CellReference("B1");
         CellReference b2 = new CellReference("B2");
+        CellReference c1 = new CellReference("C1");
         
         // Set values
         sh.getRow(a1.getRow()).getCell(a1.getCol()).setCellValue(210);
         sh.getRow(a2.getRow()).getCell(a2.getCol()).setCellValue(55);
         sh.getRow(b1.getRow()).getCell(b1.getCol()).setCellValue(35);
         sh.getRow(b2.getRow()).getCell(b2.getCol()).setCellValue(0);
+        sh.getRow(c1.getRow()).getCell(c1.getCol()).setCellFormula("A1/B2");
         
         Cell cell1 = sh.createRow(3).createCell(0);
         cell1.setCellFormula("IFERROR(A1/B1,\"Error in calculation\")");
         Cell cell2 = sh.createRow(3).createCell(0);
         cell2.setCellFormula("IFERROR(A2/B2,\"Error in calculation\")");
-
+        Cell cell3 = sh.createRow(3).createCell(0);
+        cell3.setCellFormula("IFERROR(C1,\"error\")");
+        
         double accuracy = 1E-9;
 
         FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
@@ -80,5 +86,10 @@ public class TestIfError extends TestCase {
         		Cell.CELL_TYPE_STRING, evaluator.evaluate(cell2).getCellType());        
         assertEquals("Rounds -10 to a nearest multiple of -3 (-9)",
                 "Error in calculation", evaluator.evaluate(cell2).getStringValue());
+        
+        assertEquals("Check that C1 returns string", 
+        		Cell.CELL_TYPE_STRING, evaluator.evaluate(cell3).getCellType());
+        assertEquals("Check that C1 returns string \"error\"", 
+        		"error", evaluator.evaluate(cell3).getStringValue());
     }
-}
\ No newline at end of file
+}