ext.ux.ofcgxt - LineChartProvider example

[smfed]

Hi,

I have some stupid problem with LineChartProvider. I was able to set up BarChartProvider as in the Demo.java and graphs were rendered. But when I am doing the same with LineChartProvider i get the exception. Here is the trace:



[ERROR] Unable to load module entry point class com.sungard.testqa.magellan.client.FastVersions (see associated exception for details)
java.lang.NullPointerException: null
at com.extjs.gxt.ui.client.data.NestedModelUtil.isNestedProperty(NestedModelUtil.java:68)
at com.extjs.gxt.ui.client.data.BaseModelData.get(BaseModelData.java:42)
at ext.ux.ofcgxt.client.data.ModelChartProvider$2.getStringValue(ModelChartProvider.java:94)
at ext.ux.ofcgxt.client.data.LineChartProvider.updateChartModelData(LineChartProvider.java:97)
at ext.ux.ofcgxt.client.data.BaseModelChartBuilder.buildJsonData(BaseModelChartBuilder.java:77)
at ext.ux.ofcgxt.client.GxtChartWidget.refresh(GxtChartWidget.java:64)
at ext.ux.ofcgxt.client.GxtChartWidget.setModelChartBuilder(GxtChartWidget.java:78)
at com.sungard.testqa.magellan.client.FastVersions.onModuleLoad(FastVersions.java:90)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:320)
at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace(BrowserWidget.java:329)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6.access$300(BrowserWidgetIE6.java:37)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad(BrowserWidgetIE6.java:76)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.invoke(BrowserWidgetIE6.java:139)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.GWTShell.pumpEventLoop(GWTShell.java:720)
at com.google.gwt.dev.GWTShell.run(GWTShell.java:593)
at com.google.gwt.dev.GWTShell.main(GWTShell.java:357)Probably there is something wrong with my store?? But it is very simple. If anyone can have a look at this or simply give me the code of working LineChart it would be great!

Here is the code:


final ListStore<Duration2> store2 = new ListStore<Duration2>();
store2.add(new Duration2("Q1", 2));
store2.add(new Duration2("Q2", 1));
store2.add(new Duration2("Q3", 3));
store2.add(new Duration2("Q4", 5));

final GxtChartWidget chart1 = new GxtChartWidget();


BaseModelChartBuilder builder = new BaseModelChartBuilder();

final LineChartProvider<Duration2> lcp = new LineChartProvider<Duration2>(LineChart.LineStyle.NORMAL, "alphasales");
lcp.setStore(store2);

builder.getChartData().setTitle(new Text("Sales by Qtr (Alpha & Beta Teams)"));
builder.getChartData().setBackgroundColour("#eeeeee");
builder.addProvider(lcp);
betacp.getBarChart().setColour("#00aa00");

chart1.setModelChartBuilder(builder);


cont.add(chart1, new RowData(1f, 0.65f));
view.add(cont, new BorderLayoutData(LayoutRegion.CENTER));
RootPanel.get().add(view);

........
public class Duration2 extends BaseModel {
/**
*
*/
private static final long serialVersionUID = -2697488328170513282L;

public Duration2(String qtr, double a) {
setQtr(qtr);
setAlphaSales(a);

}

public void setQtr(String qtr) {
set("qtr", qtr);
}

public String getQtr() {
return get("qtr");
}

public void setAlphaSales(double sales) {
set("alphasales", sales);
}

public String getAlphaSales() {
return get("alphasales");
}

}



Thank you,
Stepan

[smfed]

So i ve done some debuging the problem is in this line of code:i

String label = labelProvider.getStringValue(m, modelXValue);
in file LineChartProvider

our modelXValue in null because we didn't set it anywhere. And here is the mistery part:D, I don't know what happened to me but I was pretty damn sure that when instantiating LineChartProvider we can only state yvalue, which is aparently not true.

new LineChartProvider<Duration2>(LineChart.LineStyle.NORMAL, "alphasales", "qtr");

I knew that the problem was very stupid and it was me. Any way why would anyone need to instntiate LCP only with yvalue, so I am going to blame developer for this:). Just a joke. It is a really nice stuff. Thanks for this one