e4 数据绑定转换器异常未捕获

Question

我创建了一个自定义转换器来将字符串转换回日期。

public Object convert(Object fromObject){
   if (fromObject != null && fromObject.toString().trim().length() == 0){
       return null;
   }

   for (DateFormat f : formats){
       try{
            return f.parse(fromObject.toString());
       }catch (ParseException e){
           // Ignore
       }
   }

   throw new RuntimeException(message);
}

基本上，如果字符串不可解析，将抛出 RuntimeException。

我已经将转换器添加到数据查找中的更新策略中，并且正在调用它。

问题是什么时候抛出异常。（例如，当我开始在 TextFiled 中键入日期时）。不是出现装饰器字段来指示输入中的错误，而是未捕获异常。

异常出现在控制台日志中（日志中的错误在问题的末尾），似乎没有人发现它。

我错过了什么？转换器中的异常应该在 updateStrategy 中捕获并显示错误，不是吗？

!ENTRY org.eclipse.core.databinding 4 0 2017-08-18 15:16:27.816 !MESSAGE Invalid time Format !STACK 0 java.lang.RuntimeException: Invalid time Format at com.lsespace.earthcare.tds.gui.util.databinding.conversion.StringToJavaTimeTagConverter.convert(StringToJavaTimeTagConverter.java:21) at org.eclipse.core.databinding.UpdateStrategy.convert(UpdateStrategy.java:715) at org.eclipse.core.databinding.UpdateValueStrategy.convert(UpdateValueStrategy.java:1) at org.eclipse.core.databinding.ValueBinding.run(ValueBinding.java:175) at org.eclipse.core.databinding.observable.Realm.run(Realm.java:149) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.databinding.observable.Realm.safeRun(Realm.java:153) at org.eclipse.core.databinding.observable.Realm.exec(Realm.java:171) at org.eclipse.core.databinding.ValueBinding.doUpdate(ValueBinding.java:158) at org.eclipse.core.databinding.ValueBinding.access(ValueBinding.java:147) at org.eclipse.core.databinding.ValueBinding.handleValueChange(ValueBinding.java:46) at org.eclipse.core.databinding.observable.value.ValueChangeEvent.dispatch(ValueChangeEvent.java:70) at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:117) at org.eclipse.core.databinding.observable.value.DecoratingObservableValue.fireValueChange(DecoratingObservableValue.java:61) at org.eclipse.core.databinding.observable.value.DecoratingObservableValue.handleValueChange(DecoratingObservableValue.java:103) at org.eclipse.core.databinding.observable.value.DecoratingObservableValue.handleValueChange(DecoratingObservableValue.java:76) at org.eclipse.core.databinding.observable.value.ValueChangeEvent.dispatch(ValueChangeEvent.java:70) at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:117) at org.eclipse.core.databinding.observable.value.AbstractObservableValue.fireValueChange(AbstractObservableValue.java:82) at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.notifyIfChanged(SimplePropertyObservableValue.java:126) at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.access(SimplePropertyObservableValue.java:118) at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.run(SimplePropertyObservableValue.java:70) at org.eclipse.core.databinding.observable.Realm.run(Realm.java:149) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.databinding.observable.Realm.safeRun(Realm.java:153) at org.eclipse.core.databinding.observable.Realm.exec(Realm.java:171) at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.handleEvent(SimplePropertyObservableValue.java:66) at org.eclipse.core.databinding.property.NativePropertyListener.fireChange(NativePropertyListener.java:69) at org.eclipse.jface.internal.databinding.swt.WidgetListener.handleEvent(WidgetListener.java:56) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4410) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1103) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1084) at org.eclipse.swt.widgets.Text.wmCommandChild(Text.java:3117) at org.eclipse.swt.widgets.Control.WM_COMMAND(Control.java:4939) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4794) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5115) at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2446) at org.eclipse.swt.widgets.Text.callWindowProc(Text.java:262) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4889) at org.eclipse.swt.widgets.Text.windowProc(Text.java:2704) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5102) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2552) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3814) at org.eclipse.jface.window.Window.runEventLoop(Window.java:818) at org.eclipse.jface.window.Window.open(Window.java:794) at com.lsespace.earthcare.tds.gui.jface.actions.EditConfigAction.run(EditConfigAction.java:39) at org.eclipse.jface.action.Action.runWithEvent(Action.java:473) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565) at org.eclipse.jface.action.ActionContributionItem.lambda(ActionContributionItem.java:436) at org.eclipse.jface.action.ActionContributionItem$$Lambda/765702264.handleEvent(Unknown Source) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4410) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4228) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3816) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1121) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:161) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610) at org.eclipse.equinox.launcher.Main.run(Main.java:1519) at org.eclipse.equinox.launcher.Main.main(Main.java:1492)

Answer 1

这是我使用的 UpdateStrategy 的实现，因此转换器中的异常被视为验证异常。

/**
 * This implementation of UpdateValueStrategy does not catch the exceptions thrown by the converter,
 * thus letting the normal mechanism of ValueBinding deal with the exception as it will do with a
 * validation exception.
 *
 */
public class AlternativeUpdateValueStrategy extends UpdateValueStrategy {

 public AlternativeUpdateValueStrategy() {
    this(UpdateValueStrategy.POLICY_UPDATE);
 }

 public AlternativeUpdateValueStrategy(int updateStrategy) {
    super(updateStrategy);
 }

 @Override
 public Object convert(Object value) {
    if (converter != null) {
        return converter.convert(value);
    }
    return value;
 }

}

e4 数据绑定转换器异常未捕获

e4 databinding converter exception not catch

data-binding

jface

eclipse-rcp

e4