Package com.itextpdf.layout.font.selectorstrategy

Class AbstractFontSelectorStrategy

java.lang.Object
com.itextpdf.layout.font.selectorstrategy.AbstractFontSelectorStrategy
All Implemented Interfaces:
IFontSelectorStrategy
Direct Known Subclasses:
BestMatchFontSelectorStrategy, FirstMatchFontSelectorStrategy
public abstract class AbstractFontSelectorStrategy extends Object implements IFontSelectorStrategy
The class defines complex implementation of IFontSelectorStrategy which based on the following algorithm: 1. Find first significant symbol (not whitespace or special). 2. Find font which matches symbol according to passed FontSelector. 3. Try to append as many symbols as possible using the current font. 4. If symbol is not matched to the current font, go to step 1.

Algorithm takes care of the case when there is no matched font for symbol or when diacritic from another font is used (previous symbol will be processed by diacritic's font).

  • Constructor Details

    • AbstractFontSelectorStrategy

      public AbstractFontSelectorStrategy (FontProvider fontProvider, FontSelector fontSelector, FontSet additionalFonts)
      Creates a new instance of AbstractFontSelectorStrategy.
      Parameters:
      fontProvider - the font provider
      fontSelector - the font selector
      additionalFonts - the set of fonts to be used additionally to the fonts added to font provider.

  • Method Details

    • isCurrentFontCheckRequired

      protected abstract boolean isCurrentFontCheckRequired()
      If it is necessary to provide a check that the best font for passed symbol equals to the current font. Result of checking is used to split text into parts in case if inequality.
      Returns:
      true if check is needed, otherwise false

    • getGlyphLines

      public List<Tuple2<GlyphLine,PdfFont>> getGlyphLines (String text)
      Converts text into glyphs with the best matching font.
      Specified by:
      getGlyphLines in interface IFontSelectorStrategy
      Parameters:
      text - the text to split
      Returns:
      the glyphs with the matching font attached

    • matchFont

      protected PdfFont matchFont (int codePoint, FontSelector fontSelector, FontProvider fontProvider, FontSet additionalFonts)
      Finds the best font which matches passed symbol.
      Parameters:
      codePoint - the symbol to match
      fontSelector - the font selector
      fontProvider - the font provider
      additionalFonts - the addition fonts
      Returns:
      font which matches the symbol