Added providers

src/com/flaremicro/visualforecast/graphics/FontManager.java

@@ -0,0 +1,107 @@
+package com.flaremicro.visualforecast.graphics;
+
+import java.awt.Font;
+import java.awt.FontFormatException;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class FontManager {
+	private final Font baseFont;
+	private static FontManager instance = null;
+
+	private Map<URL, Integer> urlToFontMapping = new HashMap<URL, Integer>();
+	private List<Font> fonts = new ArrayList<Font>();
+
+	private FontManager() {
+		BufferedImage bufferedImage = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_BINARY);
+		Graphics g = bufferedImage.createGraphics();
+		baseFont = g.getFont();
+		g.dispose();
+	}
+
+	public static FontManager getInstance() {
+		if (instance == null)
+		{
+			instance = new FontManager();
+		}
+		return instance;
+	}
+	
+	public Font getFont(int fontId){
+		if(fontId < 0 || fontId >= fonts.size())
+			return baseFont;
+		else return fonts.get(fontId);
+	}
+	
+	public Font getFont(URL fontResource){
+		Integer i = urlToFontMapping.get(fontResource);
+		if(i == null)
+			return baseFont;
+		else return fonts.get(i);
+	}
+	
+	public int getFontID(URL fontResource){
+		Integer i = urlToFontMapping.get(fontResource);
+		if(i == null)
+			return -1;
+		else return i;
+	}
+	
+	public Font getOrCreateFont(int fontFormat, URL fontResource)
+	{
+		if(fontResource == null)
+			return baseFont.deriveFont(Font.PLAIN);
+		int i = getOrPrepareFont(fontFormat, fontResource);
+		return fonts.get(i);
+	}
+	
+	public int getOrPrepareFont(int fontFormat, URL fontResource)
+	{
+		Integer i = urlToFontMapping.get(fontResource);
+		if(i == null)
+		{
+			Font f = baseFont.deriveFont(Font.PLAIN);
+			if(fontResource == null)
+				return -1;
+			InputStream stream = null;
+			try
+			{
+				stream = fontResource.openStream();
+				f = Font.createFont(fontFormat, stream);
+			}
+			catch (IOException e)
+			{
+				e.printStackTrace();
+			}
+			catch (FontFormatException e)
+			{
+				e.printStackTrace();
+			}
+			finally{
+				if(stream != null)
+					try
+					{
+						stream.close();
+					}
+					catch (IOException e)
+					{
+						e.printStackTrace();
+					}
+			}
+			synchronized(fonts)
+			{
+				i = fonts.size();
+				fonts.add(f);
+				urlToFontMapping.put(fontResource, i);
+			}
+		}
+		return i;
+	}
+}