org.apache.poi.hssf.usermodel.HSSFRichTextString Maven / Gradle / Ivy
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package org.apache.poi.hssf.usermodel;
import java.util.Iterator;
import org.apache.poi.hssf.model.InternalWorkbook;
import org.apache.poi.hssf.record.LabelSSTRecord;
import org.apache.poi.hssf.record.common.FormatRun;
import org.apache.poi.hssf.record.common.UnicodeString;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.RichTextString;
/**
* Rich text unicode string. These strings can have fonts applied to
* arbitary parts of the string.
*
*
* Note, that in certain cases creating too many HSSFRichTextString cells may cause Excel 2003 and lower to crash
* when changing the color of the cells and then saving the Excel file. Compare two snippets that produce equivalent output:
*
*
* HSSFCell hssfCell = row.createCell(idx);
* //rich text consists of two runs
* HSSFRichTextString richString = new HSSFRichTextString( "Hello, World!" );
* richString.applyFont( 0, 6, font1 );
* richString.applyFont( 6, 13, font2 );
* hssfCell.setCellValue( richString );
*
*
* and
*
*
* //create a cell style and assign the first font to it
* HSSFCellStyle style = workbook.createCellStyle();
* style.setFont(font1);
*
* HSSFCell hssfCell = row.createCell(idx);
* hssfCell.setCellStyle(style);
*
* //rich text consists of one run overriding the cell style
* HSSFRichTextString richString = new HSSFRichTextString( "Hello, World!" );
* richString.applyFont( 6, 13, font2 );
* hssfCell.setCellValue( richString );
*
*
* Excel always uses the latter approach: for a reach text containing N runs Excel saves the font of the first run in the cell's
* style and subsequent N-1 runs override this font.
*
*
For more information regarding this behavior please consult Bugzilla 47543:
*
*
* https://issues.apache.org/bugzilla/show_bug.cgi?id=47543
*/
public final class HSSFRichTextString implements Comparable, RichTextString {
/** Place holder for indicating that NO_FONT has been applied here */
public static final short NO_FONT = 0;
private UnicodeString _string;
private InternalWorkbook _book;
private LabelSSTRecord _record;
public HSSFRichTextString() {
this("");
}
public HSSFRichTextString(String string) {
if (string == null) {
_string = new UnicodeString("");
} else {
_string = new UnicodeString(string);
}
}
HSSFRichTextString(InternalWorkbook book, LabelSSTRecord record) {
setWorkbookReferences(book, record);
_string = book.getSSTString(record.getSSTIndex());
}
/** This must be called to setup the internal work book references whenever
* a RichTextString is added to a cell
*/
void setWorkbookReferences(InternalWorkbook book, LabelSSTRecord record) {
_book = book;
_record = record;
}
/** Called whenever the unicode string is modified. When it is modified
* we need to create a new SST index, so that other LabelSSTRecords will not
* be affected by changes that we make to this string.
*/
private UnicodeString cloneStringIfRequired() {
return (_book == null) ? _string : _string.copy();
}
private void addToSSTIfRequired() {
if (_book != null) {
int index = _book.addSSTString(_string);
_record.setSSTIndex(index);
//The act of adding the string to the SST record may have meant that
//an existing string was returned for the index, so update our local version
_string = _book.getSSTString(index);
}
}
/**
* Applies a font to the specified characters of a string.
*
* @param startIndex The start index to apply the font to (inclusive)
* @param endIndex The end index to apply the font to (exclusive)
* @param fontIndex The font to use.
*/
public void applyFont(int startIndex, int endIndex, short fontIndex) {
if (startIndex > endIndex)
throw new IllegalArgumentException("Start index must be less than end index.");
if (startIndex < 0 || endIndex > length())
throw new IllegalArgumentException("Start and end index not in range.");
if (startIndex == endIndex)
return;
//Need to check what the font is currently, so we can reapply it after
//the range is completed
short currentFont = NO_FONT;
if (endIndex != length()) {
currentFont = this.getFontAtIndex(endIndex);
}
//Need to clear the current formatting between the startIndex and endIndex
_string = cloneStringIfRequired();
Iterator formatting = _string.formatIterator();
if (formatting != null) {
while (formatting.hasNext()) {
FormatRun r = formatting.next();
if ((r.getCharacterPos() >= startIndex) && (r.getCharacterPos() < endIndex))
formatting.remove();
}
}
_string.addFormatRun(new FormatRun((short)startIndex, fontIndex));
if (endIndex != length())
_string.addFormatRun(new FormatRun((short)endIndex, currentFont));
addToSSTIfRequired();
}
/**
* Applies a font to the specified characters of a string.
*
* @param startIndex The start index to apply the font to (inclusive)
* @param endIndex The end index to apply to font to (exclusive)
* @param font The index of the font to use.
*/
public void applyFont(int startIndex, int endIndex, Font font) {
applyFont(startIndex, endIndex, (short)font.getIndex());
}
/**
* Sets the font of the entire string.
* @param font The font to use.
*/
public void applyFont(Font font) {
applyFont(0, _string.getCharCount(), font);
}
/**
* Removes any formatting that may have been applied to the string.
*/
public void clearFormatting() {
_string = cloneStringIfRequired();
_string.clearFormatting();
addToSSTIfRequired();
}
/**
* Returns the plain string representation.
*/
public String getString() {
return _string.getString();
}
/**
* Used internally by the HSSFCell to get the internal
* string value.
* Will ensure the string is not shared
*/
UnicodeString getUnicodeString() {
return cloneStringIfRequired();
}
/**
* Returns the raw, probably shared Unicode String.
* Used when tweaking the styles, eg updating font
* positions.
* Changes to this string may well effect
* other RichTextStrings too!
*/
UnicodeString getRawUnicodeString() {
return _string;
}
/** Used internally by the HSSFCell to set the internal string value*/
void setUnicodeString(UnicodeString str) {
this._string = str;
}
/**
* @return the number of characters in the text.
*/
public int length() {
return _string.getCharCount();
}
/**
* Returns the font in use at a particular index.
*
* @param index The index.
* @return The font that's currently being applied at that
* index or null if no font is being applied or the
* index is out of range.
*/
public short getFontAtIndex( int index ) {
int size = _string.getFormatRunCount();
FormatRun currentRun = null;
for (int i=0;i index) {
break;
}
currentRun = r;
}
if (currentRun == null) {
return NO_FONT;
}
return currentRun.getFontIndex();
}
/**
* @return The number of formatting runs used. There will always be at
* least one of font NO_FONT.
*
* @see #NO_FONT
*/
public int numFormattingRuns() {
return _string.getFormatRunCount();
}
/**
* The index within the string to which the specified formatting run applies.
* @param index the index of the formatting run
* @return the index within the string.
*/
public int getIndexOfFormattingRun(int index) {
FormatRun r = _string.getFormatRun(index);
return r.getCharacterPos();
}
/**
* Gets the font used in a particular formatting run.
*
* @param index the index of the formatting run
* @return the font number used.
*/
public short getFontOfFormattingRun(int index) {
FormatRun r = _string.getFormatRun(index);
return r.getFontIndex();
}
/**
* Compares one rich text string to another.
*/
public int compareTo(HSSFRichTextString r) {
return _string.compareTo(r._string);
}
@Override
public boolean equals(Object o) {
if (o instanceof HSSFRichTextString) {
return _string.equals(((HSSFRichTextString)o)._string);
}
return false;
}
@Override
public int hashCode() {
assert false : "hashCode not designed";
return 42; // any arbitrary constant will do
}
/**
* @return the plain text representation of this string.
*/
public String toString() {
return _string.toString();
}
/**
* Applies the specified font to the entire string.
*
* @param fontIndex the font to apply.
*/
public void applyFont( short fontIndex ) {
applyFont(0, _string.getCharCount(), fontIndex);
}
}