From 607ca594b1dce19678e09cd5478e80a6b4aa6df3 Mon Sep 17 00:00:00 2001
From: Javen O'Neal <onealj@apache.org>
Date: Sat, 4 Nov 2017 07:29:53 +0000
Subject: [PATCH] bug 61474, github #81: fix ColumnShifter#removalNeeded to use
 columns instead of rows

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1814257 13f79535-47bb-0310-9956-ffa450edef68
---
 .../apache/poi/ss/usermodel/helpers/ColumnShifter.java | 10 ++++++++--
 .../apache/poi/ss/usermodel/helpers/RowShifter.java    | 10 ++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/java/org/apache/poi/ss/usermodel/helpers/ColumnShifter.java b/src/java/org/apache/poi/ss/usermodel/helpers/ColumnShifter.java
index 7769f30c5..fdd064a3d 100644
--- a/src/java/org/apache/poi/ss/usermodel/helpers/ColumnShifter.java
+++ b/src/java/org/apache/poi/ss/usermodel/helpers/ColumnShifter.java
@@ -49,6 +49,7 @@ public abstract class ColumnShifter extends BaseRowColShifter {
      * @param n        the number of columns to shift
      * @return an array of affected merged regions, doesn't contain deleted ones
      */
+    // Keep this code in sync with {@link RowShifter#shiftMergedRegions}
     public List<CellRangeAddress> shiftMergedRegions(int startColumn, int endColumn, int n) {
         List<CellRangeAddress> shiftedRegions = new ArrayList<>();
         Set<Integer> removedIndices = new HashSet<>();
@@ -93,6 +94,7 @@ public abstract class ColumnShifter extends BaseRowColShifter {
         return shiftedRegions;
     }
 
+    // Keep in sync with {@link RowShifter#removalNeeded}
     private boolean removalNeeded(CellRangeAddress merged, int startColumn, int endColumn, int n) {
         final int movedColumns = endColumn - startColumn + 1;
 
@@ -101,10 +103,14 @@ public abstract class ColumnShifter extends BaseRowColShifter {
         final CellRangeAddress overwrite;
         if(n > 0) {
             // area is moved down => overwritten area is [endColumn + n - movedColumns, endColumn + n]
-            overwrite = new CellRangeAddress(Math.max(endColumn + 1, endColumn + n - movedColumns), endColumn + n, 0, 0);
+            final int firstCol = Math.max(endColumn + 1, endColumn + n - movedColumns);
+            final int lastCol = endColumn + n;
+            overwrite = new CellRangeAddress(0, 0, firstCol, lastCol);
         } else {
             // area is moved up => overwritten area is [startColumn + n, startColumn + n + movedColumns]
-            overwrite = new CellRangeAddress(startColumn + n, Math.min(startColumn - 1, startColumn + n + movedColumns), 0, 0);
+            final int firstCol = startColumn + n;
+            final int lastCol = Math.min(startColumn - 1, startColumn + n + movedColumns);
+            overwrite = new CellRangeAddress(0, 0, firstCol, lastCol);
         }
 
         // if the merged-region and the overwritten area intersect, we need to remove it
diff --git a/src/java/org/apache/poi/ss/usermodel/helpers/RowShifter.java b/src/java/org/apache/poi/ss/usermodel/helpers/RowShifter.java
index 09566e4dc..965fa97ec 100644
--- a/src/java/org/apache/poi/ss/usermodel/helpers/RowShifter.java
+++ b/src/java/org/apache/poi/ss/usermodel/helpers/RowShifter.java
@@ -51,6 +51,7 @@ public abstract class RowShifter extends BaseRowColShifter {
      * @param n        the number of rows to shift
      * @return an array of affected merged regions, doesn't contain deleted ones
      */
+    // Keep this code in sync with {@link ColumnShifter#shiftMergedRegions}
     public List<CellRangeAddress> shiftMergedRegions(int startRow, int endRow, int n) {
         List<CellRangeAddress> shiftedRegions = new ArrayList<>();
         Set<Integer> removedIndices = new HashSet<>();
@@ -95,6 +96,7 @@ public abstract class RowShifter extends BaseRowColShifter {
         return shiftedRegions;
     }
 
+    // Keep in sync with {@link ColumnShifter#removalNeeded}
     private boolean removalNeeded(CellRangeAddress merged, int startRow, int endRow, int n) {
         final int movedRows = endRow - startRow + 1;
 
@@ -103,10 +105,14 @@ public abstract class RowShifter extends BaseRowColShifter {
         final CellRangeAddress overwrite;
         if(n > 0) {
             // area is moved down => overwritten area is [endRow + n - movedRows, endRow + n]
-            overwrite = new CellRangeAddress(Math.max(endRow + 1, endRow + n - movedRows), endRow + n, 0, 0);
+            final int firstRow = Math.max(endRow + 1, endRow + n - movedRows);
+            final int lastRow = endRow + n;
+            overwrite = new CellRangeAddress(firstRow, lastRow, 0, 0);
         } else {
             // area is moved up => overwritten area is [startRow + n, startRow + n + movedRows]
-            overwrite = new CellRangeAddress(startRow + n, Math.min(startRow - 1, startRow + n + movedRows), 0, 0);
+            final int firstRow = startRow + n;
+            final int lastRow = Math.min(startRow - 1, startRow + n + movedRows);
+            overwrite = new CellRangeAddress(firstRow, lastRow, 0, 0);
         }
 
         // if the merged-region and the overwritten area intersect, we need to remove it