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The Apache Commons Codec package contains simple encoder and decoders for
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/* ====================================================================
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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
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package org.apache.poi.ss.util;
import java.awt.font.FontRenderContext;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.text.AttributedString;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.util.Internal;
/**
* Helper methods for when working with Usermodel sheets
*
* @author Yegor Kozlov
*/
public class SheetUtil {
/**
* Excel measures columns in units of 1/256th of a character width
* but the docs say nothing about what particular character is used.
* '0' looks to be a good choice.
*/
private static final char defaultChar = '0';
/**
* This is the multiple that the font height is scaled by when determining the
* boundary of rotated text.
*/
private static final double fontHeightMultiple = 2.0;
/**
* Dummy formula evaluator that does nothing.
* YK: The only reason of having this class is that
* {@link org.apache.poi.ss.usermodel.DataFormatter#formatCellValue(org.apache.poi.ss.usermodel.Cell)}
* returns formula string for formula cells. Dummy evaluator makes it to format the cached formula result.
*
* See Bugzilla #50021
*/
private static final FormulaEvaluator dummyEvaluator = new FormulaEvaluator() {
@Override
public void clearAllCachedResultValues(){}
@Override
public void notifySetFormula(Cell cell) {}
@Override
public void notifyDeleteCell(Cell cell) {}
@Override
public void notifyUpdateCell(Cell cell) {}
@Override
public CellValue evaluate(Cell cell) {return null; }
@Override
public Cell evaluateInCell(Cell cell) { return null; }
@Override
public void setupReferencedWorkbooks(Map workbooks) {}
@Override
public void setDebugEvaluationOutputForNextEval(boolean value) {}
@Override
public void setIgnoreMissingWorkbooks(boolean ignore) {}
@Override
public void evaluateAll() {}
@Override
public CellType evaluateFormulaCell(Cell cell) { return cell.getCachedFormulaResultType(); }
};
/**
* drawing context to measure text
*/
private static final FontRenderContext fontRenderContext = new FontRenderContext(null, true, true);
/**
* Compute width of a single cell
*
* @param cell the cell whose width is to be calculated
* @param defaultCharWidth the width of a single character
* @param formatter formatter used to prepare the text to be measured
* @param useMergedCells whether to use merged cells
* @return the width in pixels or -1 if cell is empty
*/
public static double getCellWidth(Cell cell, int defaultCharWidth, DataFormatter formatter, boolean useMergedCells) {
List mergedRegions = cell.getSheet().getMergedRegions();
return getCellWidth(cell, defaultCharWidth, formatter, useMergedCells, mergedRegions);
}
/**
* Compute width of a single cell
*
* This method receives the list of merged regions as querying it from the cell/sheet
* is time-consuming and thus caching the list across cells speeds up certain operations
* considerably.
*
* @param cell the cell whose width is to be calculated
* @param defaultCharWidth the width of a single character
* @param formatter formatter used to prepare the text to be measured
* @param useMergedCells whether to use merged cells
* @param mergedRegions The list of merged regions as received via cell.getSheet().getMergedRegions()
* @return the width in pixels or -1 if cell is empty
*/
public static double getCellWidth(Cell cell, int defaultCharWidth, DataFormatter formatter, boolean useMergedCells,
List mergedRegions) {
Sheet sheet = cell.getSheet();
Workbook wb = sheet.getWorkbook();
Row row = cell.getRow();
int column = cell.getColumnIndex();
// FIXME: this looks very similar to getCellWithMerges below. Consider consolidating.
// We should only be checking merged regions if useMergedCells is true. Why are we doing this for-loop?
int colspan = 1;
for (CellRangeAddress region : mergedRegions) {
if (region.isInRange(row.getRowNum(), column)) {
if (!useMergedCells) {
// If we're not using merged cells, skip this one and move on to the next.
return -1;
}
cell = row.getCell(region.getFirstColumn());
colspan = 1 + region.getLastColumn() - region.getFirstColumn();
}
}
CellStyle style = cell.getCellStyle();
CellType cellType = cell.getCellType();
// for formula cells we compute the cell width for the cached formula result
if (cellType == CellType.FORMULA)
cellType = cell.getCachedFormulaResultType();
Font font = wb.getFontAt(style.getFontIndex());
double width = -1;
if (cellType == CellType.STRING) {
RichTextString rt = cell.getRichStringCellValue();
String[] lines = rt.getString().split("\\n");
for (String line : lines) {
String txt = line + defaultChar;
AttributedString str = new AttributedString(txt);
copyAttributes(font, str, 0, txt.length());
/*if (rt.numFormattingRuns() > 0) {
// TODO: support rich text fragments
}*/
width = getCellWidth(defaultCharWidth, colspan, style, width, str);
}
} else {
String sval = null;
if (cellType == CellType.NUMERIC) {
// Try to get it formatted to look the same as excel
try {
sval = formatter.formatCellValue(cell, dummyEvaluator);
} catch (Exception e) {
sval = String.valueOf(cell.getNumericCellValue());
}
} else if (cellType == CellType.BOOLEAN) {
sval = String.valueOf(cell.getBooleanCellValue()).toUpperCase(Locale.ROOT);
}
if(sval != null) {
String txt = sval + defaultChar;
AttributedString str = new AttributedString(txt);
copyAttributes(font, str, 0, txt.length());
width = getCellWidth(defaultCharWidth, colspan, style, width, str);
}
}
return width;
}
/**
* Calculate the best-fit width for a cell
* If a merged cell spans multiple columns, evenly distribute the column width among those columns
*
* @param defaultCharWidth the width of a character using the default font in a workbook
* @param colspan the number of columns that is spanned by the cell (1 if the cell is not part of a merged region)
* @param style the cell style, which contains text rotation and indention information needed to compute the cell width
* @param minWidth the minimum best-fit width. This algorithm will only return values greater than or equal to the minimum width.
* @param str the text contained in the cell
* @return the best fit cell width
*/
private static double getCellWidth(int defaultCharWidth, int colspan,
CellStyle style, double minWidth, AttributedString str) {
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
final Rectangle2D bounds;
if(style.getRotation() != 0){
/*
* Transform the text using a scale so that it's height is increased by a multiple of the leading,
* and then rotate the text before computing the bounds. The scale results in some whitespace around
* the unrotated top and bottom of the text that normally wouldn't be present if unscaled, but
* is added by the standard Excel autosize.
*/
AffineTransform trans = new AffineTransform();
trans.concatenate(AffineTransform.getRotateInstance(style.getRotation()*2.0*Math.PI/360.0));
trans.concatenate(
AffineTransform.getScaleInstance(1, fontHeightMultiple)
);
bounds = layout.getOutline(trans).getBounds();
} else {
bounds = layout.getBounds();
}
// frameWidth accounts for leading spaces which is excluded from bounds.getWidth()
final double frameWidth = bounds.getX() + bounds.getWidth();
return Math.max(minWidth, ((frameWidth / colspan) / defaultCharWidth) + style.getIndention());
}
/**
* Compute width of a column and return the result
*
* @param sheet the sheet to calculate
* @param column 0-based index of the column
* @param useMergedCells whether to use merged cells
* @return the width in pixels or -1 if all cells are empty
*/
public static double getColumnWidth(Sheet sheet, int column, boolean useMergedCells) {
return getColumnWidth(sheet, column, useMergedCells, sheet.getFirstRowNum(), sheet.getLastRowNum());
}
/**
* Compute width of a column based on a subset of the rows and return the result
*
* @param sheet the sheet to calculate
* @param column 0-based index of the column
* @param useMergedCells whether to use merged cells
* @param firstRow 0-based index of the first row to consider (inclusive)
* @param lastRow 0-based index of the last row to consider (inclusive)
* @return the width in pixels or -1 if cell is empty
*/
public static double getColumnWidth(Sheet sheet, int column, boolean useMergedCells, int firstRow, int lastRow){
DataFormatter formatter = new DataFormatter();
int defaultCharWidth = getDefaultCharWidth(sheet.getWorkbook());
List mergedRegions = sheet.getMergedRegions();
double width = -1;
for (int rowIdx = firstRow; rowIdx <= lastRow; ++rowIdx) {
Row row = sheet.getRow(rowIdx);
if( row != null ) {
double cellWidth = getColumnWidthForRow(row, column, defaultCharWidth, formatter, useMergedCells, mergedRegions);
width = Math.max(width, cellWidth);
}
}
return width;
}
/**
* Get default character width using the Workbook's default font
*
* @param wb the workbook to get the default character width from
* @return default character width in pixels
*/
@Internal
public static int getDefaultCharWidth(final Workbook wb) {
Font defaultFont = wb.getFontAt( 0);
AttributedString str = new AttributedString(String.valueOf(defaultChar));
copyAttributes(defaultFont, str, 0, 1);
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return (int) layout.getAdvance();
}
/**
* Compute width of a single cell in a row
* Convenience method for {@link #getCellWidth}
*
* @param row the row that contains the cell of interest
* @param column the column number of the cell whose width is to be calculated
* @param defaultCharWidth the width of a single character
* @param formatter formatter used to prepare the text to be measured
* @param useMergedCells whether to use merged cells
* @return the width in pixels or -1 if cell is empty
*/
private static double getColumnWidthForRow(
Row row, int column, int defaultCharWidth, DataFormatter formatter, boolean useMergedCells,
List mergedRegions) {
if( row == null ) {
return -1;
}
Cell cell = row.getCell(column);
if (cell == null) {
return -1;
}
return getCellWidth(cell, defaultCharWidth, formatter, useMergedCells, mergedRegions);
}
/**
* Check if the Fonts are installed correctly so that Java can compute the size of
* columns.
*
* If a Cell uses a Font which is not available on the operating system then Java may
* fail to return useful Font metrics and thus lead to an auto-computed size of 0.
*
* This method allows to check if computing the sizes for a given Font will succeed or not.
*
* @param font The Font that is used in the Cell
* @return true if computing the size for this Font will succeed, false otherwise
*/
public static boolean canComputeColumnWidth(Font font) {
// not sure what is the best value sample-here, only "1" did not work on some platforms...
AttributedString str = new AttributedString("1w");
copyAttributes(font, str, 0, "1w".length());
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return (layout.getBounds().getWidth() > 0);
}
/**
* Copy text attributes from the supplied Font to Java2D AttributedString
*/
private static void copyAttributes(Font font, AttributedString str, @SuppressWarnings("SameParameterValue") int startIdx, int endIdx) {
str.addAttribute(TextAttribute.FAMILY, font.getFontName(), startIdx, endIdx);
str.addAttribute(TextAttribute.SIZE, (float)font.getFontHeightInPoints());
if (font.getBold()) str.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, startIdx, endIdx);
if (font.getItalic() ) str.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE, startIdx, endIdx);
if (font.getUnderline() == Font.U_SINGLE ) str.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON, startIdx, endIdx);
}
/**
* Return the cell, without taking account of merged regions.
*
* Use {@link #getCellWithMerges(Sheet, int, int)} if you want the top left
* cell from merged regions instead when the reference is a merged cell.
*
* Use this where you want to know if the given cell is explicitly defined
* or not.
*
* @param sheet The workbook sheet to look at.
* @param rowIx The 0-based index of the row.
* @param colIx The 0-based index of the cell.
* @return cell at the given location, or null if not defined
* @throws NullPointerException if sheet is null
*/
public static Cell getCell(Sheet sheet, int rowIx, int colIx) {
Row r = sheet.getRow(rowIx);
if (r != null) {
return r.getCell(colIx);
}
return null;
}
/**
* Return the cell, taking account of merged regions. Allows you to find the
* cell who's contents are shown in a given position in the sheet.
*
*
If the cell at the given co-ordinates is a merged cell, this will
* return the primary (top-left) most cell of the merged region.
*
If the cell at the given co-ordinates is not in a merged region,
* then will return the cell itself.
*
If there is no cell defined at the given co-ordinates, will return
* null.
*
* @param sheet The workbook sheet to look at.
* @param rowIx The 0-based index of the row.
* @param colIx The 0-based index of the cell.
* @return cell at the given location, its base merged cell, or null if not defined
* @throws NullPointerException if sheet is null
*/
public static Cell getCellWithMerges(Sheet sheet, int rowIx, int colIx) {
final Cell c = getCell(sheet, rowIx, colIx);
if (c != null) return c;
for (CellRangeAddress mergedRegion : sheet.getMergedRegions()) {
if (mergedRegion.isInRange(rowIx, colIx)) {
// The cell wanted is in this merged range
// Return the primary (top-left) cell for the range
Row r = sheet.getRow(mergedRegion.getFirstRow());
if (r != null) {
return r.getCell(mergedRegion.getFirstColumn());
}
}
}
// If we get here, then the cell isn't defined, and doesn't
// live within any merged regions
return null;
}
}