Class AbstractFontSelectorStrategy

  • All Implemented Interfaces:
    IFontSelectorStrategy
    Direct Known Subclasses:
    BestMatchFontSelectorStrategy, FirstMatchFontSelectorStrategy

    public abstract class AbstractFontSelectorStrategy
    extends java.lang.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).

    • Field Detail

      • additionalFonts

        private final FontSet additionalFonts
    • Constructor Detail

      • 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 Detail

      • 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 java.util.List<Tuple2<GlyphLine,​PdfFont>> getGlyphLines​(java.lang.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
      • nextSignificantIndex

        private static int nextSignificantIndex​(int startIndex,
                                                java.lang.String text)
      • isSignificantUnicodeScript

        private static boolean isSignificantUnicodeScript​(java.lang.Character.UnicodeScript unicodeScript)
      • extractCodePoint

        private static int extractCodePoint​(java.lang.String text,
                                            int idx)