fop/src/org/apache/fop/layout/FontInfo.java

/* $Id$
 * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

package org.apache.fop.layout;

import java.util.Hashtable;
import org.apache.fop.messaging.MessageHandler;
import java.util.Enumeration;

import org.apache.fop.apps.FOPException;

public class FontInfo {
  Hashtable usedFonts;
  Hashtable triplets; // look up a font-triplet to find a font-name
  Hashtable fonts; // look up a font-name to get a font (that implements FontMetric at least)

  public FontInfo() {
    this.triplets = new Hashtable(); 
    this.fonts = new Hashtable();
    this.usedFonts = new Hashtable();
  }

  public void addFontProperties(String name, String family, String style, String weight) {
    /* add the given family, style and weight as a lookup for the font
       with the given name */

    String key = createFontKey(family,style,weight);
    this.triplets.put(key,name);
  }

  public void addMetrics(String name, FontMetric metrics) {
    // add the given metrics as a font with the given name

    this.fonts.put(name,metrics);
  }

    public String fontLookup(String family, String style, String weight) 
	throws FOPException
    {
	return fontLookup(createFontKey(family,style,weight));
    }
    
    public String fontLookup(String key) 
	throws FOPException
    {
	
	String f = (String)this.triplets.get(key);
	if (f == null) {
	    int i = key.indexOf(',');
	    String s = "any"+key.substring(i);
	    f = (String)this.triplets.get(s);
	    if (f == null) {
		f = (String)this.triplets.get("any,normal,normal");
		if (f == null) {
		    throw new FOPException("no default font defined by OutputConverter");
		}
		MessageHandler.errorln("WARNING: defaulted font to any,normal,normal");
	    }
	    MessageHandler.errorln("WARNING: unknown font "+key+" so defaulted font to any");
	}
	
	usedFonts.put(f, fonts.get(f)); 
	return f;
    }

    /**
     * Creates a key from the given strings
     */
    public static String createFontKey(String family, String style, String weight) 
    {
	int i;
	
	try {
	    i = Integer.parseInt(weight);
	} catch (NumberFormatException e) {
	    i = 0;
	}
	
	if (i > 600)
	    weight = "bold";
	else if (i > 0)
	    weight = "normal";
	
	return family + "," + style + "," + weight;
    }
    


  public Hashtable getFonts() {
    return this.fonts;
  }

  public Hashtable getUsedFonts() {
    return this.usedFonts;
  }

  public FontMetric getMetricsFor(String fontName) throws FOPException {
      usedFonts.put(fontName, fonts.get(fontName));
      return (FontMetric)fonts.get(fontName);
  }

}