RE: Getting a list of font names without the memory hit...‏

[Bernard Giannetti]

I'm using FOP inside my desktop app.  I use FOP to combine .xml data files and 
.xsl template files into PDFs.  I wanted to give the user the choice of font to 
use for the PDF text and so I am calling FOP code to get that list of fonts.

Date: Tue, 30 Jul 2013 21:41:10 -0500
From: lmpmberna...@gmail.com
To: fop-users@xmlgraphics.apache.org
Subject: Re: Getting a list of font names without the memory hit...‏


  
    
  
  
    Are you using FOP in your Desktop app
      (meaning you feed and FO file and output one of the supported
      formats) or you just want to use some classes to get the list of
      fonts in your system?

      

      On 7/30/13 5:42 PM, Bernard Giannetti wrote:

    
    
      
      
        (apologies for the double post...somehow
            my email got tagged to the end of an unrelated post)
        

          
        
          

            
          Hi,

        
          
            
          I'm making a call to 
org.apache.fop.tools.fontlist.FontListGenerator.listFonts(
              ... ) to get a list of font names
              for my desktop application.  To get the font names, I take the 
keys from the
              returned fontFamilies
              SortedMap; the actual data is
              junked.
          
              
          I hadn't
                realised just how much memory is used by listfont(
                ... ) - on some platforms such as Windows 7, in
                excess of 250 MB.  In this case I'm hitting out of
                memory errors.
          

              
          I was
                wondering if there's a simpler way (uses less memory) to
                get just the font names (first family names)?  As I
                said, I don't make use of the metrics and other font
                details...just the first family name for each font.  Digging 
down into  listfont(
                ... ), I was wondering if it's safe to take the firstFamilyName 
and place it
              into a list say and then drop the following lines for the 
containers/sort?
          
            
          
            Iterator iter =
                fontInfo.getFontTriplets().entrySet().iterator();
            while (iter.hasNext()) {
             
                    Map.Entry
                  entry = (Map.Entry)iter.next();
             
                    FontTriplet
                  triplet = (FontTriplet)entry.getKey();
             
                    String
                  key = (String)entry.getValue();
             
                    FontSpec
                  container;
             
                    if
                  (keyBag.contains(key)) {
             
                       
                  keyBag.remove(key);
            
              
             
                       
                  FontMetrics metrics = (FontMetrics)fonts.get(key);
            
              
             
                        container = new FontSpec(key,
                  metrics);
             
                        container.addFamilyNames(metrics.getFamilyNames());
             
                        keys.put(key, container);
             
                        String firstFamilyName =
                  (String)container.getFamilyNames().first();
             
                        List containers =
                  (List)fontFamilies.get(firstFamilyName);
             
                        if (containers == null) {
             
                         
                    containers = new
                  java.util.ArrayList();
             
                         
                    fontFamilies.put(firstFamilyName,
                  containers);
             
                        }
             
                        containers.add(container);
             
                        Collections.sort(containers);
             
                    } else {
             
                        container =
                  (FontSpec)keys.get(key);
             
                    }
             
                    container.addTriplet(triplet);
            }
          
          
            
          I'm guessing a lot
              of memory is chewed up in the containers/sort
              section...but really I can't be sure as I don't fully
              follow what's going on!
          
            
          Ideally I'd just up
              the amount of memory supplied to the desktop application,
              but I don't have that option and besides, it just delays
              the problem of running out of memory.
          
            
          

          
          
            Thanks in advance,
            
              
            Bernard.