Dynamic JQPlot

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package BusinessLogic.Page;

import BusinessLogic.GraphDefinition.Graph;
import BusinessLogic.Objects.DataPoint;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;


/**
 *
 * @author vincentm
 */
public class PageBuilder {
    private String datatoplot = "";
    
    private ArrayList<DataPoint> seriesa;
    private ArrayList<DataPoint> seriesb;
    private GregorianCalendar start;
    private GregorianCalendar end;
    private GraphBuilder graphbuilder;
    private Graph graph;
    
    public PageBuilder(){
	//Build the dataset.  This is where you would have fetched data from a datasource.
	seriesa = new ArrayList<DataPoint>();
	seriesb = new ArrayList<DataPoint>();

	
	start = (GregorianCalendar)Calendar.getInstance();
	end = (GregorianCalendar)Calendar.getInstance();
	GregorianCalendar gc_tmp = (GregorianCalendar)Calendar.getInstance();
	gc_tmp.add(Calendar.HOUR, -5);
	start.add(Calendar.HOUR, -10);
	for(int i = 0; i < 100; i++){
	    DataPoint a = new DataPoint();
	    DataPoint b = new DataPoint();
	    
	    a.setDateTimeStamp(gc_tmp);
	    double aval = Math.pow(i, 1.0/2.0);
	    a.setPointValue(aval);
	    b.setDateTimeStamp(gc_tmp);
	    double bval = i*(1.0/7.0);
	    b.setPointValue(bval);
	    seriesa.add(a);
	    seriesb.add(b);
	    gc_tmp.add(Calendar.HOUR, 1);

	}
	end.setTimeInMillis(gc_tmp.getTimeInMillis());
	
	//Here the graph gets built.
	graphbuilder = new GraphBuilder();
	graph = graphbuilder.Build(seriesa, seriesb, start, end);
	
	
    }

    /** write the javascript arrays to the page so it can be used by JQPlot. */
    public String WritePlotData(){
	StringBuilder builder2 = new StringBuilder("");	    //defines the legend labels
	StringBuilder builder3 = new StringBuilder("");    //object names
	StringBuilder builder = new StringBuilder("");	    //datapoints array

	builder2.append("var legendlabels = ['Series A', 'Series B']");
	builder3.append("[series_a, series_b]");
	builder.append("var series_a = [");
	for(int i = 0; i < seriesa.size(); i++){
	    if(i != 0){
		builder.append(",");
	    }			
	    GregorianCalendar gc_tmp = seriesa.get(i).getDateTimeStamp();
	    builder.append("[");		    
	    builder.append("(new Date(");
	    builder.append(gc_tmp.get(Calendar.YEAR));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MONTH));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.DAY_OF_MONTH));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.HOUR_OF_DAY));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MINUTE));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.SECOND));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MILLISECOND));
	    builder.append(")).getTime()");

	    builder.append(",");
	    builder.append(seriesa.get(i).getPointValue());
	    builder.append("]");
	}
	builder.append("];");

	builder.append("var series_b = [");
	for(int i = 0; i < seriesb.size(); i++){
	    if(i != 0){
		builder.append(",");
	    }			
	    GregorianCalendar gc_tmp = seriesb.get(i).getDateTimeStamp();
	    builder.append("[");		    
	    builder.append("(new Date(");
	    builder.append(gc_tmp.get(Calendar.YEAR));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MONTH));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.DAY_OF_MONTH));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.HOUR_OF_DAY));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MINUTE));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.SECOND));
	    builder.append(",");
	    builder.append(gc_tmp.get(Calendar.MILLISECOND));
	    builder.append(")).getTime()");

	    builder.append(",");
	    builder.append(seriesb.get(i).getPointValue());
	    builder.append("]");
	}
	builder.append("];");
	builder.append(builder2.toString());
	datatoplot = builder3.toString();
	return builder.toString();
    }

    /**
     * This is where you write the graph definition.  
     * An asynchronous call was used to let the page load, while JQPlot is generating the graph.
     */
    public String WriteGraphDefinition(){
	StringBuilder builder = new StringBuilder("");
	StringBuilder builder_graphfunction = new StringBuilder("");
	StringBuilder builder_asyncfunction = new StringBuilder("");
	StringBuilder builder_zoom = new StringBuilder("");		

	builder_asyncfunction.append("var asynctimer;");
	builder_asyncfunction.append("function CreateGraphAsync(){ asynctimer=setInterval('CreateGraph()', 500);}");
	builder_graphfunction.append("function CreateGraph(){ clearInterval(asynctimer);");
	builder_graphfunction.append("try{");
	builder_graphfunction.append(graph.toString());
	builder_graphfunction.append("plot = $.jqplot('chart', ").append(datatoplot).append(", optionsObj);");
	builder_graphfunction.append("}catch(ex){alert(ex.stack);}");
	builder_graphfunction.append("}");


	builder.append(builder_asyncfunction).append(builder_zoom).append(builder_graphfunction);

	return builder.toString();
    }
	 
}