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src/schule/ngb/zm/util/FontLoader.java

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+package schule.ngb.zm.util;
+
+import java.awt.Font;
+import java.awt.FontFormatException;
+import java.awt.GraphicsEnvironment;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class FontLoader {
+
+	private static final Map<String, Font> fontCache = new ConcurrentHashMap<>();
+
+	public static Font loadFont( String source ) {
+		if( source == null || source.length() == 0 )
+			throw new IllegalArgumentException("Font source may not be null or empty.");
+
+		if( fontCache.containsKey(source) ) {
+			return fontCache.get(source);
+		}
+
+		// Look for System fonts
+		Font font = Font.decode(source);
+		if( font != null && source.toLowerCase().contains(font.getFamily().toLowerCase()) ) {
+			fontCache.put(source, font);
+			return font;
+		}
+
+		// Load userfonts
+		try {
+			InputStream in;
+
+			File file = new File(source);
+			if( file.isFile() ) {
+				in = new FileInputStream(file);
+			} else {
+				// load ressource relative to .class-file
+				in = FontLoader.class.getResourceAsStream(source);
+
+				// relative to ClassLoader
+				if( in == null ) {
+					in = FontLoader.class.getClassLoader().getResourceAsStream(source);
+				}
+
+				// load form web or jar-file
+				if( in == null ) {
+					in = new URL(source).openStream();
+				}
+
+
+				font = Font.createFont(Font.TRUETYPE_FONT, in).deriveFont(Font.PLAIN);
+			}
+
+			if( font != null ) {
+				fontCache.put(source, font);
+				//ge.registerFont(font);
+			}
+
+			return font;
+		} catch( IOException | FontFormatException ex ) {
+			// TODO: Log error!
+			return null;
+		}
+	}
+
+	private FontLoader() {
+	}
+
+}