simplechartengine.java

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			area.setAttribute("series", series);
		    if (chart.isShowTooltiptext() && info.getToolTipText() == null) {
		    	area.setTooltiptext(series.toString());
		    }
		} else if (model instanceof HiLoModel) {
			Comparable series = ((HiLoModel)model).getSeries();
			if (series == null) {
				series = DEFAULT_HI_LO_SERIES;
			}
			area.setAttribute("series", series);
		    if (chart.isShowTooltiptext() && info.getToolTipText() == null) {
		    	area.setTooltiptext(series.toString());
		    }
		}
	}

	/**
	 * decode TickLabelEntity into key-value pair of Area's componentScope.
	 * @param area the Area where the final attribute is set
	 * @param info the TickLabelEntity to be decoded.
	 */
	private void decodeTickLabelInfo(Area area, TickLabelEntity info, Chart chart) {
		if (info == null) {
			return;
		}
		final ChartModel model = chart.getModel(); 
		final int seq = ((Integer)chart.getAttribute("TICK_SEQ")).intValue();
		
		if (model instanceof CategoryModel) {
			Comparable category = ((CategoryModel)model).getCategory(seq);
			area.setAttribute("category", category);
		    if (chart.isShowTooltiptext() && info.getToolTipText() == null) {
		    	area.setTooltiptext(category.toString());
		    }
		}
	}

	/**
	 * decode PieSectionEntity into key-value pair of Area's componentScope.
	 * @param area the Area where the final attribute is set
	 * @param info the PieSectionEntity to be decoded.
	 */
	private void decodePieInfo(Area area, PieSectionEntity info) {
		if (info == null) {
			return;
		}
		
		PieDataset dataset = info.getDataset();
		Comparable category = info.getSectionKey();
		area.setAttribute("category", category);
		area.setAttribute("value", dataset.getValue(category));
	}
	
	/**
	 * decode CategoryItemEntity into key-value pair of Area's componentScope.
	 * @param area the Area where the final attribute is set
	 * @param info the CategoryItemEntity to be decoded.
	 */
	private void decodeCategoryInfo(Area area, CategoryItemEntity info) {
		if (info == null) {
			return;
		}
		
		CategoryDataset dataset = info.getDataset();
		int si = info.getSeries();
		Comparable category = (Comparable) info.getCategory();
		Comparable series = (Comparable) dataset.getRowKey(si);
		
		area.setAttribute("series", series);
		area.setAttribute("category", category);
		area.setAttribute("value", dataset.getValue(series, category));
	}

	/**
	 * decode XYItemEntity into key-value pair of Area's componentScope.
	 * @param area the Area where the final attribute is set
	 * @param info the XYItemEntity to be decoded.
	 */
	private void decodeXYInfo(Area area, XYItemEntity info) {
		if (info == null) {
			return;
		}
		
		XYDataset dataset = info.getDataset();
		int si = info.getSeriesIndex();
		int ii = info.getItem();

		area.setAttribute("series", dataset.getSeriesKey(si));
		
		if (dataset instanceof OHLCDataset) {
			OHLCDataset ds = (OHLCDataset) dataset;
			area.setAttribute("date", new Date(ds.getX(si, ii).longValue()));
			area.setAttribute("open", ds.getOpen(si, ii));
			area.setAttribute("high", ds.getHigh(si, ii));
			area.setAttribute("low", ds.getLow(si, ii));
			area.setAttribute("close", ds.getClose(si, ii));
			area.setAttribute("volume", ds.getVolume(si, ii));
		} else {
			area.setAttribute("x", dataset.getX(si, ii));
			area.setAttribute("y", dataset.getY(si, ii));
		}
		
	}
	
	//-- Chart specific implementation --//
	/** base chart */
	abstract private class ChartImpl {
		abstract void render(Chart chart, Area area, ChartEntity info);
		abstract JFreeChart createChart(Chart chart);
	}
	
	/** pie chart */
	private class Pie extends ChartImpl {
		public void render(Chart chart, Area area, ChartEntity info) {
			if (info instanceof LegendItemEntity) {
				area.setAttribute("entity", "LEGEND");
				Integer seq = (Integer)chart.getAttribute("LEGEND_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("LEGEND_SEQ", seq);
				decodeLegendInfo(area, (LegendItemEntity)info, chart);
			} else if (info instanceof PieSectionEntity) {
				area.setAttribute("entity", "DATA");
				decodePieInfo(area, (PieSectionEntity)info);
			} else {
				area.setAttribute("entity", "TITLE");
				if (chart.isShowTooltiptext()) {
					area.setTooltiptext(chart.getTitle());
				}
			}
		}
		
		protected PieDataset getDataset(ChartModel model) {
			if (model instanceof CategoryModel) {
				return CategoryModelToPieDataset((CategoryModel)model);
			} else if (model instanceof PieModel) {
				return PieModelToPieDataset((PieModel) model);
			} else {
				throw new UiException("model must be a org.zkoss.zul.PieModel or a org.zkoss.zul.CategoryModel");
			}
		}			
		
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			return ChartFactory.createPieChart(
				chart.getTitle(), 
				getDataset(model), 
				chart.isShowLegend(), 
				chart.isShowTooltiptext(), true);
		}
	}
	
	/** pie3d chart */
	private class Pie3d extends Pie {
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			return ChartFactory.createPieChart3D(
				chart.getTitle(), 
				getDataset(model), 
				chart.isShowLegend(), 
				chart.isShowTooltiptext(), true);
		}
	}		
		
	/** ring chart */
	private class Ring extends Pie {
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			return ChartFactory.createRingChart(
				chart.getTitle(), 
				getDataset(model), 
				chart.isShowLegend(), 
				chart.isShowTooltiptext(), true);
		}
	}		

	/** bar chart */
	private class Bar extends ChartImpl {
		public void render(Chart chart, Area area, ChartEntity info) {
			if (info instanceof LegendItemEntity) {
				area.setAttribute("entity", "LEGEND");
				Integer seq = (Integer)chart.getAttribute("LEGEND_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("LEGEND_SEQ", seq);
				decodeLegendInfo(area, (LegendItemEntity)info, chart);
			} else if (info instanceof CategoryItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeCategoryInfo(area, (CategoryItemEntity)info);
			} else if (info instanceof XYItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeXYInfo(area, (XYItemEntity) info);
			} else if (info instanceof TickLabelEntity) {
				area.setAttribute("entity", "CATEGORY");
				Integer seq = (Integer)chart.getAttribute("TICK_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("TICK_SEQ", seq);
				decodeTickLabelInfo(area, (TickLabelEntity) info, chart);
			} else {
				area.setAttribute("entity", "TITLE");
				if (chart.isShowTooltiptext()) {
					area.setTooltiptext(chart.getTitle());
				}
			}
		}
		
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (model instanceof CategoryModel) {
				return ChartFactory.createBarChart(
					chart.getTitle(),
					chart.getXAxis(),
					chart.getYAxis(),
					CategoryModelToCategoryDataset((CategoryModel)model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else if (model instanceof XYModel) {
				return ChartFactory.createXYBarChart(
					chart.getTitle(),
					chart.getXAxis(),
					false,
					chart.getYAxis(),
					(IntervalXYDataset) XYModelToXYDataset((XYModel)model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel or a org.zkoss.zul.XYModel");
			}
		}
	}

	/** bar3d chart */
	private class Bar3d extends Bar {
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (!(model instanceof CategoryModel)) {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel");
			}
			return ChartFactory.createBarChart3D(
				chart.getTitle(),
				chart.getXAxis(),
				chart.getYAxis(),
				CategoryModelToCategoryDataset((CategoryModel)model),
				getOrientation(chart.getOrient()), 
				chart.isShowLegend(), 
				chart.isShowTooltiptext(), true);
		}
	}
	
	/** area chart */
	private class AreaImpl extends ChartImpl {
		public void render(Chart chart, Area area, ChartEntity info) {
			if (info instanceof LegendItemEntity) {
				area.setAttribute("entity", "LEGEND");
				Integer seq = (Integer)chart.getAttribute("LEGEND_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("LEGEND_SEQ", seq);
				decodeLegendInfo(area, (LegendItemEntity)info, chart);
			} else if (info instanceof CategoryItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeCategoryInfo(area, (CategoryItemEntity)info);
			} else if (info instanceof XYItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeXYInfo(area, (XYItemEntity) info);
			} else if (info instanceof TickLabelEntity) {
				area.setAttribute("entity", "CATEGORY");
				Integer seq = (Integer)chart.getAttribute("TICK_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("TICK_SEQ", seq);
				decodeTickLabelInfo(area, (TickLabelEntity) info, chart);
			} else {
				area.setAttribute("entity", "TITLE");
				if (chart.isShowTooltiptext()) {
					area.setTooltiptext(chart.getTitle());
				}
			}
		}
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (model instanceof CategoryModel) {
				return ChartFactory.createAreaChart(
					chart.getTitle(),
					chart.getXAxis(),
					chart.getYAxis(),
					CategoryModelToCategoryDataset((CategoryModel)model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else if (model instanceof XYModel) {
				return ChartFactory.createXYAreaChart(
					chart.getTitle(),
					chart.getXAxis(),
					chart.getYAxis(),
					XYModelToXYDataset((XYModel)model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel or a org.zkoss.zul.XYModel");
			}
				
		}
	}

	/** line chart */
	private class Line extends ChartImpl {
		public void render(Chart chart, Area area, ChartEntity info) {
			if (info instanceof LegendItemEntity) {
				area.setAttribute("entity", "LEGEND");
				Integer seq = (Integer)chart.getAttribute("LEGEND_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("LEGEND_SEQ", seq);
				decodeLegendInfo(area, (LegendItemEntity)info, chart);
			} else if (info instanceof CategoryItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeCategoryInfo(area, (CategoryItemEntity)info);
			} else if (info instanceof XYItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeXYInfo(area, (XYItemEntity) info);
			} else if (info instanceof TickLabelEntity) {
				area.setAttribute("entity", "CATEGORY");
				Integer seq = (Integer)chart.getAttribute("TICK_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("TICK_SEQ", seq);
				decodeTickLabelInfo(area, (TickLabelEntity) info, chart);
			} else {
				area.setAttribute("entity", "TITLE");
				if (chart.isShowTooltiptext()) {
					area.setTooltiptext(chart.getTitle());
				}
			}
		}
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (model instanceof CategoryModel) {
				return ChartFactory.createLineChart(
					chart.getTitle(),
					chart.getXAxis(),
					chart.getYAxis(),
					CategoryModelToCategoryDataset((CategoryModel) model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else if (model instanceof XYModel) {
				return ChartFactory.createXYLineChart(
					chart.getTitle(),
					chart.getXAxis(),
					chart.getYAxis(),
					XYModelToXYDataset((XYModel) model),
					getOrientation(chart.getOrient()), 
					chart.isShowLegend(), 
					chart.isShowTooltiptext(), true);
			} else {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel or a org.zkoss.zul.XYModel");
			}
		}
	}

	/** line3d chart */
	private class Line3d extends Line {
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (!(model instanceof CategoryModel)) {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel");
			}
			return ChartFactory.createLineChart3D(
				chart.getTitle(),
				chart.getXAxis(),
				chart.getYAxis(),
				CategoryModelToCategoryDataset((CategoryModel) model),
				getOrientation(chart.getOrient()), 
				chart.isShowLegend(), 
				chart.isShowTooltiptext(), true);
		}
	}

	/** stackedbar chart */
	private class StackedBar extends ChartImpl {
		public void render(Chart chart, Area area, ChartEntity info) {
			if (info instanceof LegendItemEntity) {
				area.setAttribute("entity", "LEGEND");
				Integer seq = (Integer)chart.getAttribute("LEGEND_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("LEGEND_SEQ", seq);
				decodeLegendInfo(area, (LegendItemEntity)info, chart);
			} else if (info instanceof CategoryItemEntity) {
				area.setAttribute("entity", "DATA");
				decodeCategoryInfo(area, (CategoryItemEntity)info);
			} else if (info instanceof TickLabelEntity) {
				area.setAttribute("entity", "CATEGORY");
				Integer seq = (Integer)chart.getAttribute("TICK_SEQ");
				seq = seq == null ? new Integer(0) : new Integer(seq.intValue()+1);
				chart.setAttribute("TICK_SEQ", seq);
				decodeTickLabelInfo(area, (TickLabelEntity) info, chart);
			} else {
				area.setAttribute("entity", "TITLE");
				if (chart.isShowTooltiptext()) {
					area.setTooltiptext(chart.getTitle());
				}
			}
		}
		public JFreeChart createChart(Chart chart) {
			ChartModel model = (ChartModel) chart.getModel();
			if (!(model instanceof CategoryModel)) {
				throw new UiException("model must be a org.zkoss.zul.CategoryModel");