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The Apache Commons Codec package contains simple encoder and decoders for
various formats such as Base64 and Hexadecimal. In addition to these
widely used encoders and decoders, the codec package also maintains a
collection of phonetic encoding utilities.
/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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package org.apache.poi.ss.usermodel.helpers;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.util.Beta;
/**
* Helper for shifting columns up or down
*
* @since POI 4.0.0
*/
// non-Javadoc: This abstract class exists to consolidate duplicated code between XSSFColumnShifter and HSSFColumnShifter
// (currently methods sprinkled throughout HSSFSheet)
@Beta
public abstract class ColumnShifter extends BaseRowColShifter {
protected final Sheet sheet;
public ColumnShifter(Sheet sh) {
sheet = sh;
}
/**
* Shifts, grows, or shrinks the merged regions due to a column shift.
* Merged regions that are completely overlaid by shifting will be deleted.
*
* @param startColumn the column to start shifting
* @param endColumn the column to end shifting
* @param n the number of columns to shift
* @return an array of affected merged regions, doesn't contain deleted ones
* @since POI 4.0.0
*/
// Keep this code in sync with {@link RowShifter#shiftMergedRegions}
@Override
public List shiftMergedRegions(int startColumn, int endColumn, int n) {
List shiftedRegions = new ArrayList<>();
Set removedIndices = new HashSet<>();
//move merged regions completely if they fall within the new region boundaries when they are shifted
int size = sheet.getNumMergedRegions();
for (int i = 0; i < size; i++) {
CellRangeAddress merged = sheet.getMergedRegion(i);
// remove merged region that are replaced by the shifting,
// i.e. where the area includes something in the overwritten area
if(removalNeeded(merged, startColumn, endColumn, n)) {
removedIndices.add(i);
continue;
}
boolean inStart = (merged.getFirstColumn() >= startColumn || merged.getLastColumn() >= startColumn);
boolean inEnd = (merged.getFirstColumn() <= endColumn || merged.getLastColumn() <= endColumn);
//don't check if it's not within the shifted area
if (!inStart || !inEnd) {
continue;
}
//only shift if the region outside the shifted columns is not merged too
if (!merged.containsColumn(startColumn - 1) && !merged.containsColumn(endColumn + 1)) {
merged.setFirstColumn(merged.getFirstColumn() + n);
merged.setLastColumn(merged.getLastColumn() + n);
//have to remove/add it back
shiftedRegions.add(merged);
removedIndices.add(i);
}
}
if(!removedIndices.isEmpty()) {
sheet.removeMergedRegions(removedIndices);
}
//read so it doesn't get shifted again
for (CellRangeAddress region : shiftedRegions) {
sheet.addMergedRegion(region);
}
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;
// build a range of the columns that are overwritten, i.e. the target-area, but without
// columns that are moved along
final CellRangeAddress overwrite;
if(n > 0) {
// area is moved down => overwritten area is [endColumn + n - movedColumns, endColumn + n]
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]
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
return merged.intersects(overwrite);
}
public void shiftColumns(int firstShiftColumnIndex, int lastShiftColumnIndex, int step){
if(step > 0){
for (Row row : sheet)
if(row != null)
row.shiftCellsRight(firstShiftColumnIndex, lastShiftColumnIndex, step);
}
else if(step < 0){
for (Row row : sheet)
if(row != null)
row.shiftCellsLeft(firstShiftColumnIndex, lastShiftColumnIndex, -step);
}
//else step == 0 => nothing to shift
}
}