Overview

You can use Kabeja as library in your application if you need to parse DXF and generate SVG output.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.xml.sax.ContentHandler;

import org.kabeja.dxf.DXFDocument;
import org.kabeja.parser.DXFParseException;
import org.kabeja.parser.Parser;
import org.kabeja.parser.ParserBuilder;
import org.kabeja.svg.SVGGenerator;  
import org.kabeja.xml.SAXGenerator; 
 public class MyClass{

  public MyClass(){
            ...
  }

  public void parseFile(String sourceFile) {

    Parser parser = ParserBuilder.createDefaultParser();

    try {
	 parser.parse(new FileInputStream(sourceFile));

	 DXFDocument doc = parser.getDocument();

         //the SVG will be emitted as SAX-Events
         //see org.xml.sax.ContentHandler for more information 
 
         ContentHandler myhandler = new ContentHandlerImpl();

         //the output - create first a SAXGenerator (SVG here)
	 SAXGenerator generator = new SVGGenerator();
	 
	 //setup properties
	 generator.setProperties(new HashMap());
	 
	 //start the output
	 generator.generate(doc,myhandler);
        

	} catch (DXFParseException e) {
	     e.printStackTrace();
	} catch (IOException ioe) {
	     ioe.printStackTrace();
	}
  }
 }

Get data from the DXFDocument

The main goal is the conversion to SVG, but you can query most data from the DXFDocument and work with the data inside your application.

The following example shows how to extract a layer and polyline of a draft.

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.kabeja.dxf.DXFConstants;
import org.kabeja.dxf.DXFDocument;
import org.kabeja.dxf.DXFLayer;
import org.kabeja.dxf.DXFLine;
import org.kabeja.dxf.DXFPolyline;
import org.kabeja.dxf.DXFVertex;
import org.kabeja.dxf.DXFConstants;
import org.kabeja.dxf.helpers.Point;
import org.kabeja.parser.DXFParseException;
import org.kabeja.parser.Parser;
import org.kabeja.parser.DXFParser;
import org.kabeja.parser.ParserBuilder;

public class DXFExtractor{
  
  public void  read(InputStream in, String layerid) {

   Parser parser = ParserBuilder.createDefaultParser();
   try {
		 	
       //parse
       parser.parse(in, DXFParser.DEFAULT_ENCODING);
			
       //get the documnet and the layer
       DXFDocument doc = parser.getDocument();
       DXFLayer layer = doc.getDXFLayer(layerid);

       //get all polylines from the layer
       List plines = layer.getDXFEntities(DXFConstants.ENTITY_TYPE_POLYLINE);
			
       //work with the first polyline
       doSomething((DXFPolyline) plines.get(0));

      } catch (DXFParseException e) {
	e.printStackTrace();
      }	
  }

  public void doSomething(DXFPolyline pline) {

    //iterate over all vertex of the polyline
    for (int i = 0; i < pline.getVertexCount(); i++) {
		    
     DXFVertex vertex = pline.getVertex(i);
                    
     //do something like collect the data and
     //build a mesh for a FEM system
    }
  }
}