e4数据绑定转换器异常未捕获

Question

我已经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，将引发RuntimeException。

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;
 }

}