FOPWrapper.java

   1
   2 import java.io.*;
   3
   4 import org.xml.sax.*;
   5 import com.apple.cocoa.foundation.NSData;
   6
   7 //Avalon
   8 import org.apache.avalon.framework.ExceptionUtil;
   9 import org.apache.avalon.framework.logger.Logger;
  10 import org.apache.avalon.framework.logger.ConsoleLogger;
  11
  12 //FOP
  13 import org.apache.fop.apps.Driver;
  14 import org.apache.fop.apps.FOPException;
  15 import org.apache.fop.messaging.MessageHandler;
  16
  17 /**
  18  * This class helps calling FOP from the Obj-C side.
  19  * Based on "ExampleFO2PDF.java" from the FOP project.
  20  */
  21 public class FOPWrapper {
  22
  23     String error;
  24     boolean errorOccurred = false;
  25
  26         public NSData convert(NSData foData) throws IOException, FOPException {
  27
  28                 //Construct driver
  29         System.setProperty("java.awt.headless", "true");
  30                 Driver driver = new Driver();
  31
  32                 //Setup logger
  33                 Logger logger = new ConsoleLogger(ConsoleLogger.LEVEL_INFO);
  34                 driver.setLogger(logger);
  35                 MessageHandler.setScreenLogger(logger);
  36
  37                 //Setup Renderer (output format)
  38                 driver.setRenderer(Driver.RENDER_PDF);
  39
  40                 //Setup output
  41                 ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
  42                 try {
  43                         driver.setOutputStream(out);
  44
  45                         //Setup input
  46                         InputStream in = new java.io.ByteArrayInputStream(foData.bytes(0, foData.length()));
  47                         try {
  48                                 driver.setInputSource(new InputSource(in));
  49
  50                                 //Process FO
  51                                 driver.run();
  52                         } catch (Exception e) {
  53                                 error = e.toString();
  54                                 errorOccurred = true;
  55                         } finally {
  56                                 in.close();
  57                         }
  58
  59                 } finally {
  60                         out.close();
  61                 }
  62
  63                 if (errorOccurred) {
  64                         return null;
  65                 }
  66                 return new NSData(out.toByteArray());
  67
  68         }
  69
  70         public String getErrorMessage() {
  71                 return error;
  72         }
  73
  74         public boolean errorOccurred() {
  75                 return errorOccurred;
  76         }
  77
  78
  79         /*
  80     public static void main(String[] args) {
  81         try {
  82             System.out.println("FOP ExampleFO2PDF\n");
  83             System.out.println("Preparing...");
  84
  85             //Setup directories
  86             File baseDir = new File(".");
  87             File outDir = new File(baseDir, "out");
  88             outDir.mkdirs();
  89
  90             //Setup input and output files
  91             File fofile = new File(baseDir, "xml/fo/helloworld.fo");
  92             File pdffile = new File(outDir, "ResultFO2PDF.pdf");
  93
  94             System.out.println("Input: XSL-FO (" + fofile + ")");
  95             System.out.println("Output: PDF (" + pdffile + ")");
  96             System.out.println();
  97             System.out.println("Transforming...");
  98
  99             FOPWrapper app = new FOPWrapper();
 100             app.convertFO2PDF(fofile, pdffile);
 101
 102             System.out.println("Success!");
 103         } catch (Exception e) {
 104             System.err.println(ExceptionUtil.printStackTrace(e));
 105             System.exit(-1);
 106         }
 107     }
 108
 109          */
 110
 111 }