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package org.apache.poi.xssf.usermodel.helpers;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.NavigableSet;
import java.util.TreeSet;

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.xssf.util.CTColComparator;
import org.apache.poi.xssf.util.NumericRanges;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTCol;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTCols;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet;

Helper class for dealing with the Column settings on a CTWorksheet (the data part of a sheet). Note - within POI, we use 0 based column indexes, but the column definitions in the XML are 1 based!
/** * Helper class for dealing with the Column settings on * a CTWorksheet (the data part of a sheet). * Note - within POI, we use 0 based column indexes, but * the column definitions in the XML are 1 based! */
public class ColumnHelper { private CTWorksheet worksheet; public ColumnHelper(CTWorksheet worksheet) { super(); this.worksheet = worksheet; cleanColumns(); } public void cleanColumns() { TreeSet<CTCol> trackedCols = new TreeSet<>(CTColComparator.BY_MIN_MAX); CTCols newCols = CTCols.Factory.newInstance(); CTCols[] colsArray = worksheet.getColsArray(); int i; for (i = 0; i < colsArray.length; i++) { CTCols cols = colsArray[i]; for (CTCol col : cols.getColList()) { addCleanColIntoCols(newCols, col, trackedCols); } } for (int y = i - 1; y >= 0; y--) { worksheet.removeCols(y); } newCols.setColArray(trackedCols.toArray(new CTCol[0])); worksheet.addNewCols(); worksheet.setColsArray(0, newCols); } public CTCols addCleanColIntoCols(CTCols cols, CTCol newCol) { // Performance issue. If we encapsulated management of min/max in this // class then we could keep trackedCols as state, // making this log(N) rather than Nlog(N). We do this for the initial // read above. TreeSet<CTCol> trackedCols = new TreeSet<>( CTColComparator.BY_MIN_MAX); trackedCols.addAll(cols.getColList()); addCleanColIntoCols(cols, newCol, trackedCols); cols.setColArray(trackedCols.toArray(new CTCol[0])); return cols; } private void addCleanColIntoCols(final CTCols cols, final CTCol newCol, final TreeSet<CTCol> trackedCols) { List<CTCol> overlapping = getOverlappingCols(newCol, trackedCols); if (overlapping.isEmpty()) { trackedCols.add(cloneCol(cols, newCol)); return; } trackedCols.removeAll(overlapping); for (CTCol existing : overlapping) { // We add up to three columns for each existing one: non-overlap // before, overlap, non-overlap after. long[] overlap = getOverlap(newCol, existing); CTCol overlapCol = cloneCol(cols, existing, overlap); setColumnAttributes(newCol, overlapCol); trackedCols.add(overlapCol); CTCol beforeCol = existing.getMin() < newCol.getMin() ? existing : newCol; long[] before = new long[] { Math.min(existing.getMin(), newCol.getMin()), overlap[0] - 1 }; if (before[0] <= before[1]) { trackedCols.add(cloneCol(cols, beforeCol, before)); } CTCol afterCol = existing.getMax() > newCol.getMax() ? existing : newCol; long[] after = new long[] { overlap[1] + 1, Math.max(existing.getMax(), newCol.getMax()) }; if (after[0] <= after[1]) { trackedCols.add(cloneCol(cols, afterCol, after)); } } } private CTCol cloneCol(final CTCols cols, final CTCol col, final long[] newRange) { CTCol cloneCol = cloneCol(cols, col); cloneCol.setMin(newRange[0]); cloneCol.setMax(newRange[1]); return cloneCol; } private long[] getOverlap(final CTCol col1, final CTCol col2) { return getOverlappingRange(col1, col2); } private List<CTCol> getOverlappingCols(final CTCol newCol, final TreeSet<CTCol> trackedCols) { CTCol lower = trackedCols.lower(newCol); NavigableSet<CTCol> potentiallyOverlapping = lower == null ? trackedCols : trackedCols.tailSet(lower, overlaps(lower, newCol)); List<CTCol> overlapping = new ArrayList<>(); for (CTCol existing : potentiallyOverlapping) { if (overlaps(newCol, existing)) { overlapping.add(existing); } else { break; } } return overlapping; } private boolean overlaps(final CTCol col1, final CTCol col2) { return NumericRanges.getOverlappingType(toRange(col1), toRange(col2)) != NumericRanges.NO_OVERLAPS; } private long[] getOverlappingRange(final CTCol col1, final CTCol col2) { return NumericRanges.getOverlappingRange(toRange(col1), toRange(col2)); } private long[] toRange(final CTCol col) { return new long[] { col.getMin(), col.getMax() }; } public static void sortColumns(CTCols newCols) { CTCol[] colArray = newCols.getColArray(); Arrays.sort(colArray, CTColComparator.BY_MIN_MAX); newCols.setColArray(colArray); } public CTCol cloneCol(CTCols cols, CTCol col) { CTCol newCol = cols.addNewCol(); newCol.setMin(col.getMin()); newCol.setMax(col.getMax()); setColumnAttributes(col, newCol); return newCol; }
Returns the Column at the given 0 based index
/** * Returns the Column at the given 0 based index */
public CTCol getColumn(long index, boolean splitColumns) { return getColumn1Based(index+1, splitColumns); }
Returns the Column at the given 1 based index. POI default is 0 based, but the file stores as 1 based.
/** * Returns the Column at the given 1 based index. * POI default is 0 based, but the file stores * as 1 based. */
public CTCol getColumn1Based(long index1, boolean splitColumns) { CTCols cols = worksheet.getColsArray(0); // Fetching the array is quicker than working on the new style // list, assuming we need to read many of them (which we often do), // and assuming we're not making many changes (which we're not) CTCol[] colArray = cols.getColArray(); for (CTCol col : colArray) { long colMin = col.getMin(); long colMax = col.getMax(); if (colMin <= index1 && colMax >= index1) { if (splitColumns) { if (colMin < index1) { insertCol(cols, colMin, (index1 - 1), new CTCol[]{col}); } if (colMax > index1) { insertCol(cols, (index1 + 1), colMax, new CTCol[]{col}); } col.setMin(index1); col.setMax(index1); } return col; } } return null; } /* * Insert a new CTCol at position 0 into cols, setting min=min, max=max and * copying all the colsWithAttributes array cols attributes into newCol */ private CTCol insertCol(CTCols cols, long min, long max, CTCol[] colsWithAttributes) { return insertCol(cols, min, max, colsWithAttributes, false, null); } private CTCol insertCol(CTCols cols, long min, long max, CTCol[] colsWithAttributes, boolean ignoreExistsCheck, CTCol overrideColumn) { if(ignoreExistsCheck || !columnExists(cols,min,max)){ CTCol newCol = cols.insertNewCol(0); newCol.setMin(min); newCol.setMax(max); for (CTCol col : colsWithAttributes) { setColumnAttributes(col, newCol); } if (overrideColumn != null) setColumnAttributes(overrideColumn, newCol); return newCol; } return null; }
Does the column at the given 0 based index exist in the supplied list of column definitions?
/** * Does the column at the given 0 based index exist * in the supplied list of column definitions? */
public boolean columnExists(CTCols cols, long index) { return columnExists1Based(cols, index+1); } private boolean columnExists1Based(CTCols cols, long index1) { for (CTCol col : cols.getColArray()) { if (col.getMin() == index1) { return true; } } return false; } public void setColumnAttributes(CTCol fromCol, CTCol toCol) { if(fromCol.isSetBestFit()) toCol.setBestFit(fromCol.getBestFit()); if(fromCol.isSetCustomWidth()) toCol.setCustomWidth(fromCol.getCustomWidth()); if(fromCol.isSetHidden()) toCol.setHidden(fromCol.getHidden()); if(fromCol.isSetStyle()) toCol.setStyle(fromCol.getStyle()); if(fromCol.isSetWidth()) toCol.setWidth(fromCol.getWidth()); if(fromCol.isSetCollapsed()) toCol.setCollapsed(fromCol.getCollapsed()); if(fromCol.isSetPhonetic()) toCol.setPhonetic(fromCol.getPhonetic()); if(fromCol.isSetOutlineLevel()) toCol.setOutlineLevel(fromCol.getOutlineLevel()); toCol.setCollapsed(fromCol.isSetCollapsed()); } public void setColBestFit(long index, boolean bestFit) { CTCol col = getOrCreateColumn1Based(index+1, false); col.setBestFit(bestFit); } public void setCustomWidth(long index, boolean bestFit) { CTCol col = getOrCreateColumn1Based(index+1, true); col.setCustomWidth(bestFit); } public void setColWidth(long index, double width) { CTCol col = getOrCreateColumn1Based(index+1, true); col.setWidth(width); } public void setColHidden(long index, boolean hidden) { CTCol col = getOrCreateColumn1Based(index+1, true); col.setHidden(hidden); }
Return the CTCol at the given (0 based) column index, creating it if required.
/** * Return the CTCol at the given (0 based) column index, * creating it if required. */
protected CTCol getOrCreateColumn1Based(long index1, boolean splitColumns) { CTCol col = getColumn1Based(index1, splitColumns); if (col == null) { col = worksheet.getColsArray(0).addNewCol(); col.setMin(index1); col.setMax(index1); } return col; } public void setColDefaultStyle(long index, CellStyle style) { setColDefaultStyle(index, style.getIndex()); } public void setColDefaultStyle(long index, int styleId) { CTCol col = getOrCreateColumn1Based(index+1, true); col.setStyle(styleId); } // Returns -1 if no column is found for the given index public int getColDefaultStyle(long index) { if (getColumn(index, false) != null) { return (int) getColumn(index, false).getStyle(); } return -1; } private boolean columnExists(CTCols cols, long min, long max) { for (CTCol col : cols.getColList()) { if (col.getMin() == min && col.getMax() == max) { return true; } } return false; } public int getIndexOfColumn(CTCols cols, CTCol searchCol) { if (cols == null || searchCol == null) return -1; int i = 0; for (CTCol col : cols.getColList()) { if (col.getMin() == searchCol.getMin() && col.getMax() == searchCol.getMax()) { return i; } i++; } return -1; } }