From 32b370fb6748011866b7f425487106293fab3759 Mon Sep 17 00:00:00 2001
From: PJ Fanning <fanningpj@apache.org>
Date: Tue, 1 May 2018 14:47:29 +0000
Subject: [PATCH] [githib-107] add areas function support. Thanks to Inji
 Hanbin. This closes #107

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1830685 13f79535-47bb-0310-9956-ffa450edef68
---
 .../poi/ss/formula/eval/FunctionEval.java     |  1 +
 .../poi/ss/formula/functions/Areas.java       | 35 ++++++++++++++++
 .../AllIndividualFunctionEvaluationTests.java |  1 +
 .../poi/ss/formula/functions/TestAreas.java   | 42 +++++++++++++++++++
 4 files changed, 79 insertions(+)
 create mode 100644 src/java/org/apache/poi/ss/formula/functions/Areas.java
 create mode 100644 src/testcases/org/apache/poi/ss/formula/functions/TestAreas.java

diff --git a/src/java/org/apache/poi/ss/formula/eval/FunctionEval.java b/src/java/org/apache/poi/ss/formula/eval/FunctionEval.java
index a3505d448..ef4062e71 100644
--- a/src/java/org/apache/poi/ss/formula/eval/FunctionEval.java
+++ b/src/java/org/apache/poi/ss/formula/eval/FunctionEval.java
@@ -139,6 +139,7 @@ public final class FunctionEval {
         retval[73] = CalendarFieldFunction.SECOND;
         retval[74] = new Now();
         // 75: AREAS
+        retval[75] = new Areas();
         retval[76] = new Rows();
         retval[77] = new Columns();
         retval[FunctionID.OFFSET] = new Offset(); //nominally 78
diff --git a/src/java/org/apache/poi/ss/formula/functions/Areas.java b/src/java/org/apache/poi/ss/formula/functions/Areas.java
new file mode 100644
index 000000000..25c3acde2
--- /dev/null
+++ b/src/java/org/apache/poi/ss/formula/functions/Areas.java
@@ -0,0 +1,35 @@
+package org.apache.poi.ss.formula.functions;
+
+import org.apache.poi.ss.formula.eval.ErrorEval;
+import org.apache.poi.ss.formula.eval.NumberEval;
+import org.apache.poi.ss.formula.eval.RefListEval;
+import org.apache.poi.ss.formula.eval.ValueEval;
+import org.apache.poi.ss.formula.ptg.NumberPtg;
+
+/**
+ * Returns the number of areas in a reference. An area is a range of contiguous cells or a single cell.
+ *
+ * @author Loopbing (loopbing@gmail.com)
+ */
+public final class Areas implements Function {
+
+    @Override
+    public ValueEval evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
+        if (args.length == 0) {
+            return ErrorEval.VALUE_INVALID;
+        }
+        try {
+            ValueEval valueEval = args[0];
+            int result = 1;
+            if (valueEval instanceof RefListEval) {
+                RefListEval refListEval = (RefListEval) valueEval;
+                result = refListEval.getList().size();
+            }
+            NumberEval numberEval = new NumberEval(new NumberPtg(result));
+            return numberEval;
+        } catch (Exception e) {
+            return ErrorEval.VALUE_INVALID;
+        }
+
+    }
+}
diff --git a/src/testcases/org/apache/poi/ss/formula/functions/AllIndividualFunctionEvaluationTests.java b/src/testcases/org/apache/poi/ss/formula/functions/AllIndividualFunctionEvaluationTests.java
index 272c51a39..bbcf2829d 100644
--- a/src/testcases/org/apache/poi/ss/formula/functions/AllIndividualFunctionEvaluationTests.java
+++ b/src/testcases/org/apache/poi/ss/formula/functions/AllIndividualFunctionEvaluationTests.java
@@ -57,6 +57,7 @@ import org.junit.runners.Suite;
     TestValue.class,
     TestXYNumericFunction.class,
     TestAddress.class,
+    TestAreas.class,
     TestClean.class
 })
 public class AllIndividualFunctionEvaluationTests {
diff --git a/src/testcases/org/apache/poi/ss/formula/functions/TestAreas.java b/src/testcases/org/apache/poi/ss/formula/functions/TestAreas.java
new file mode 100644
index 000000000..f2cba4648
--- /dev/null
+++ b/src/testcases/org/apache/poi/ss/formula/functions/TestAreas.java
@@ -0,0 +1,42 @@
+package org.apache.poi.ss.formula.functions;
+
+import junit.framework.TestCase;
+import org.apache.poi.hssf.usermodel.HSSFCell;
+import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.formula.eval.ErrorEval;
+import org.apache.poi.ss.formula.eval.NumberEval;
+import org.apache.poi.ss.usermodel.CellType;
+import org.apache.poi.ss.usermodel.CellValue;
+
+public final class TestAreas extends TestCase {
+
+    public void testAreas() {
+        HSSFWorkbook wb = new HSSFWorkbook();
+        HSSFCell cell = wb.createSheet().createRow(0).createCell(0);
+        HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
+
+        String formulaText = "AREAS(B1)";
+        confirmResult(fe, cell, formulaText,1.0);
+
+        formulaText = "AREAS(B2:D4)";
+        confirmResult(fe, cell, formulaText,1.0);
+
+        formulaText = "AREAS((B2:D4,E5,F6:I9))";
+        confirmResult(fe, cell, formulaText,3.0);
+
+        formulaText = "AREAS((B2:D4,E5,C3,E4))";
+        confirmResult(fe, cell, formulaText,4.0);
+
+        formulaText = "AREAS((I9))";
+        confirmResult(fe, cell, formulaText,1.0);
+    }
+
+    private static void confirmResult(HSSFFormulaEvaluator fe, HSSFCell cell, String formulaText,Double expectedResult) {
+        cell.setCellFormula(formulaText);
+        fe.notifyUpdateCell(cell);
+        CellValue result = fe.evaluate(cell);
+        assertEquals(result.getCellTypeEnum(), CellType.NUMERIC);
+        assertEquals(expectedResult, result.getNumberValue());
+    }
+}