Bug 128586 Change parameter in drill through link doesn't work in pdf.
Description: Change parameter in drill through link doesn't work in pdf. Steps to reproduce: 1. New a report source and a report target. 2. Insert a report parameter p1 in target.rptdesign, drag it to Layout. 3. Insert a label in source.rptdesign, define a drill through link to target.rptdesign and set p1 to "first". 4. Preview source.rptdesign in pdf and click the link. 5. Revise drill through link to set p1 to "second", then preview in pdf, click the link. Expected result: Target show "second" as value. Actual result: Target still showed "first"
engine/org.eclipse.birt.report.engine.emitter.pdf/src/org/eclipse/birt/report/engine/emitter/pdf/PDFEmitter.java
import com.lowagie.text.pdf.PdfDestination;
import com.lowagie.text.pdf.PdfOutline;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;
/**
 * used to output the area tree in PDF file.
 * 
 * the objects passed in must be formated. Any unformated object
 * will be discarded.
 * 
 * @version $Revision$ $Date$
 */
public class PDFEmitter implements IAreaVisitor
{
	/**
	 * the default output pdf file name
	 */
	public static final String REPORT_FILE = "Report.pdf"; 
	
	/**
	 * the default image folder
	 */
	public static final String IMAGE_FOLDER = "image"; 
	
	/**
	 * the output stream
	 */
	private OutputStream output = null;
	
	/**